mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
Highly stable aqueous rechargeable Zn-ion battery: The synergistic effect between NaV_6O_(15) and V_2O_5 in skin-core heterostructured nanowires cathode

The aqueous rechargeable Zn-ion batteries based on the safe, low cost and environmental benignity aqueous electrolytes are one of the most compelling candidates for large scale energy storage applications. However, pursuing suitable insertion materials may be a great challenge due to the strong electrostatic interaction between Zn~(2+) and cathode materials. Hence, a novel NaV_6O_(15)/V_2O_5 skin-core heterostructure nanowire is reported via a one-step hydrothermal method and subsequent calcination for high-stable aqueous Zn-ion batteries (ZIBs). The NaV_6O_(15)/V_2O_5 cathode delivers high specific capacity of 390 mAh/g at 0.3 A/g and outstanding cycling stability of 267 mAh/g at 5 A/g with high capacity retention over 92.3% after 3000 cycles. The superior electrochemical performances are attributed to the synergistic effect of skin-core heterostructured NaV_6O_(15)/V_2O_5, in which the sheath of NaV_6O_(15) possesses high stability and conductivity, and the V_2O_5 endows high specific capacity. Besides, the heterojunction structure not only accelerates intercalation kinetics of Zn~(2+) transport but also further consolidates the stability of the layers of V_2O_5 during the cyclic process. This work provides a new perspective in developing feasible insertion materials for rechargeable aqueous ZIBs.
Towards high-performance anodes: Design and construction of cobalt-based sulfide materials for sodium-ion batteries

Sodium-ion batteries are increasingly becoming important in the energy storage field owing to their low cost and high natural abundance of sodium. Cobalt-based sulfide materials have been extensively studied as anode materials owing to their remarkable Na storage capability. Nevertheless, the application of cobalt-based sulfides is hampered by their serious capacity degradation and unsatisfactory cycling stability due to severe structural changes during cycling. Therefore, it is important to comprehensively summarize advances in the understanding and modification of cobalt-based sulfides from various perspectives. In the present review, recent advances on various cobalt-based sulfides, such as CoS, CoS_2, Co_3S_4, Co_9S_8, NiCo_2S_4, CuCo_2S_4, and SnCoS_4, are outlined with particular attention paid to strategies that improve their sodium storage performance. First, the mechanisms of charge storage are introduced. Subsequently, the key barriers to their extensive application and corresponding strategies for designing high-performance cobalt-based sulfide anode materials are discussed. Finally, key developments are summarized and future research directions are proposed based on recent advancements, aiming to offer possible fascinating strategies for the future promotion of cobalt-based sulfides as anode materials applied in sodium-ion batteries.
Evaporated potassium chloride for double-sided interfacial passivation in inverted planar perovskite solar cells

Defect-induced charge carrier recombination at the interfaces between perovskite and adjacent charge transport layers restricts further improvements in the device performance of perovskite solar cells (PSCs). Defect passivation at these interfaces can reduce trap states and inhibit the induced nonradiative recombination. Herein, we report a double-sided interfacial passivation via simply evaporating potassium chloride (DIP-KCl) at both the hole transport layer (HTL)/perovskite and perovskite/electron transport layer (ETL) interfaces in inverted planar PSCs. We demonstrate that the bottom KCl layer at the HTL/perovskite interface not only reduces the interfacial defects and improves the interfacial contact, but also leads to increased perovskite crystallinity, while the top KCl layer at the perovskite/ETL interface efficiently passivates the perovskite top surface defects and facilitates electron extraction at this interface. Thus, suppressed nonradiative recombination and faster charge extraction at both interfaces close to the perovskite layer can be achieved by using our DIP-KCl strategy. As a result, inverted PSCs based on DIP-KCl present an increased efficiency from 17.1% to 19.2% and enhanced stability, retaining over 90% of their initial efficiency after aging at maximum power point tracking for 1000 h. This work provides a simple and efficient way for defect passivation to further increase the efficiency and stability of PSCs.
Improved interfacial property by small molecule ethanediamine for high performance inverted planar perovskite solar cells

We report a simple and effective method to realize desirable interfacial property for inverted planar perovskite solar cells (PSCs) by using small molecule ethanediamine for the construction of a novel polyelectrolyte hole transport material (P3CT-ED HTM). It is found that P3CT-ED can not only improve the hole transport property of P3CT-K but also improve the crystallinity of adjacent perovskite film. In addition, the introduction of ethanediamine into P3CT realigns the conduction and valence bands upwards, passivates surface defects and reduces nonradiative recombination. As a consequence, compared to P3CT-K hole transport layer (HTL) based devices, the average power conversion efficiency (PCE) is boosted from 17.2% to 19.6% for the counterparts with P3CT-ED, with simultaneous enhancement in open circuit voltage and fill factor. The resultant device displays a champion PCE of 20.5% with negligible hysteresis.
Enhanced efficiency and stability in Sn-based perovskite solar cells with secondary crystallization growth

The conversion efficiencies reported for Tin (Sn) halide-based perovskite solar cells (PSCs) fall a large gap behind those of lead halide-based PSCs, mainly because of poor film quality of the former. Here we report an efficient strategy based on a simple secondary crystallization growth (SCG) technique to improve film quality for tin halide-based PSCs by applying a series of functional amine chlorides on the perovskite surface. They were discovered to enhance the film crystallinity and suppress the oxidation of Sn~(2+) remarkably, hence reduce trap state density and non-irradiative recombination in the absorber films. Furthermore, the SCG film holds the band levels matching better with carrier transport layers and herein favoring charge extraction at the device interfaces. Consequently, a champion device efficiency of 8.07% was achieved along with significant enhancements in Voc and Jsc, in contrast to 5.35% of the control device value. Moreover, the SCG film-based devices also exhibit superior stability comparing with the control one. This work explicitly paves a novel and general strategy for developing high performance lead-free PSCs.
Pyridine-triphenylamine hole transport material for inverted perovskite solar cells

In the light of superior interaction between pyridine unit and perovskite, a facile star-shaped triphenylamine-based hole transport material (HTM) incorporating pyridine core (coded as H-Pyr) is designed and synthesized. A reference HTM with benzene core, coded as H-Ben, is also prepared for a comparative study. The effects of varying core on HTMs are investigated by comparing the photophysical, electrochemical and hole mobility properties. It is found that pyridine core exhibits better conjunction and decreased dihedral angles with triphenylamine side arms than that of benzene, leading to obviously better hole mobility and well-matched work function. The perovskite film prepared on H-Pyr also shows improved crystallization than on H-Ben. Photoluminescence and electrochemical impedance studies indicate improved charge extraction and reduced recombination in the H-Pyr-based perovskite solar cells. Consequently, H-Pyr-based device exhibits higher efficiency than H-Ben-based one. After doping with a Lewis acid, tris(pentafluorophenyl)borane, H-Pyr-based device delivers a champion efficiency of 17.09%, which is much higher compared with 12.14% of the device employing conventional poly(3,4-ethy lenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) as HTM. Moreover, the H-Pyr-based device displays good long-term stability that the power conversion efficiency remains over 80% of the initial value after storage in ambient (relative humidity = 50 ± 5%) for 20 days.
Solid phase microwave-assisted fabrication of Fe-doped ZIF-8 for single-atom Fe-N-C electrocatalysts on oxygen reduction

Fe-N-C endowed with inexpensiveness, high activity, and excellent anti-poisoning power have emerged as promising candidate catalysts for oxygen reduction reaction (ORR). Single-atom Fe-N-C electrocatalysts derived from Fe-doped ZIF-8 represent the top-level ORR performance. However, the current fabrication of Fe-doped ZIF-8 relies on heavy consumption of time, energy, cost and organic solvents. Herein, we develop a rapid and solvent-free method to produce Fe-doped ZIF-8 under microwave irradiation, which can be easily amplified in combination with ball-milling. After rational pyrolysis, Fe-N-C catalysts with atomic FeN4 sites well dispersed on the hierarchically porous carbon matrix are obtained, which exhibit exceptional ORR performance with a half-wave potential of 0.782 V (vs. reversible hydrogen electrode (RHE)) and brilliant methanol tolerance. The assembled direct methanol fuel cells (DMFCs) endow a peak power density of 61 mW cm-2 and extraordinary stability, highlighting the application perspective of this strategy.
Carbon spheres with rational designed surface and secondary particlepiled structures for fast and stable sodium storage

The electrochemical performance of hard carbon in sodium storage is still limited by its poor cycling stability and rate capability because of the sluggish kinetics process. In this study, we use a simple and effective method to accelerate the kinetics process by engineering the structure of the electrode to promote its surface and near-surface reactions. This goal is realized by the use of slightly aggregated ultra-small carbon spheres. The large specific surface area formed by the small spheres can provide abundant active sites for electrochemical reactions. The abundant mesopores and macropores derived from the secondary particle piled structure of the carbon spheres could facilitate the transport of electrolytes, shorten the diffusion distance of Na+ and accommodate the volume expansion during cycling. Benefiting from these unique structure features, PG700-3 (carbon spheres with the diameters of 40-60 nm carbonized at 700 ℃) exhibits high performance for sodium storage. A high reversible capacity of 163 mAh g~(-1) could be delivered at a current density of 1.0 A g~(-1) after 100 cycles. Interestingly, at a current density of 10.0 A g~(-1), the specific capacity of PG700-3 gradually increases to 140 mAh g~(-1) after 10 000 cycles, corresponding to a capacity retention of 112%. Given the enhanced kinetics of SIBs reactions, PG700-3 exhibits an excellent rate capability, i.e., 230 and 138 mAh g~(-1) at 0.1 and 5.0 A g~(-1), respectively. This study provides a facile method to attain high performance anode materials for SIBs. The design strategy and improvement mechanism could be extended to other materials for high rate applications.
Effects of structure and electronic properties of D-p-A organic dyes on photovoltaic performance of dye-sensitized solar cells

Herein, we examine the performance of dye-sensitized solar cells containing five D-p-A organic dyes designed by systematic modification of p-bridge size and geometric structure. Each dye has a simple push-pull structure with a triarylamino group as an electron donor, bithiophene-4,4-dimethyl- 4H-cyclopenta[1,2-b:5,4-b']dithiophene (M11), 4,4-dimethyl-4H-cyclopenta[1,2-b:5,4-b']dithiophenethiophene (M12), thiophene-4,4-dimethyl-4H-cyclopenta[1,2-b:5,4-b']dithiophene (M13), 4,4-dimethyl-4H-cyclopenta[1,2-b:5,4-b']dithiophene-benzene (M14), and 4,4-dimethyl-4H-cyclopenta [1,2-b:5,4-b']dithiophene (M15) units as p-bridges, and cyanoacrylic acid as an electron acceptor/anchor. The extension of the π-bridge linkage favors wide-range absorption but, because of the concomitant molecular volume increase, hinders the efficient adsorption of dyes on the TiO_2 film surface. Hence, higher loadings are achieved for smaller dye molecules, resulting in (i) a shift of the TiO_2 conduction band edge to more negative values, (ii) a greater photocurrent, and (iii) suppressed charge recombination between the photoanode and the redox couple in the electrolyte. Consequently, under one-sun equivalent illumination (AM 1.5 G, 100 mW/cm2), the highest photovoltage, photocurrent, and conversion efficiency (g = 7.19%) are observed for M15, which has the smallest molecular volume among M series dyes.
Groups-dependent phosphines as the organic redox for point defects elimination in hybrid perovskite solar cells

Lead (Pb)0 and iodine (I)0 point defects generated during perovskite solar cell (PSC) fabrication and photoconversion form deep band energy levels as the carriers' recombination centers. These defects not only deteriorate device efficiency, but also facilitate chemical degradation with ion migration, resulting in restricted device lifetime. Herein, we present a novel type of phosphines as the point defects stabilizer for hybrid perovskite solar cells with enhanced performances. Three phosphines with varied side groups of tributyl, trioctyl and triphenyl are exampled as the dopants in perovskite films. The group dependent redox properties were observed in the perovskite film, dependent on their molecular weights and steric hinderances of phosphines. The partially oxidized tributyl phosphine (TBUP) with additional tributyl phosphine oxides (TBPO) is efficient in reduction of lead (Pb)0 and iodine (I)0 concentrations during the device fabrication and operation. The device with TBUP-TBPO pair showed enhanced power conversion efficiency (PCE) to 20.48% and maintain 91.7% of their initial PCEs after 500 h at 65 ℃ thermal annealing. Thus, this work presents an efficient route of utilize the phosphine species to reduce point defects in the perovskite film, which promoting further development of novel phosphorous additives with defects stabilization, interface passivation and encapsulation for low-cost solution processed PSCs.
Nanostructured strategies towards boosting organic lithium-ion batteries

Pursuing material development for next-generation batteries, organic electrode materials have shown great potential for lithium-ion batteries. However, their widespread adopting is plagued by intrinsic problems such as poor electronic conductivity, high dissolution inside electrolytes and unstable chemical peculiarity. Recently, nanostructured-strategies promoted organic electrodes with exotic properties for enhancing electron and ion transport together with the stability during electrochemical process, have received increasing attention and have been extensive applied in boosting the organic lithium-ion based energy storage. In this review, we summarize the applications of nanostructures to improve the performance of both organic anodes and cathodes, including (i) nanoscale design of zero-dimensional organic electrode materials, (ii) strategies of one-dimensional nanostructured organic electrode materials, (iii) construction of two-dimensional nanosized organic composite electrodes, and (iv) three-dimensional exploration of nanosized organic electrodes. We hope to stimulate high-quality applied research on understanding and handling the relationship between the nanostructure and performance of organic lithium-ion batteries that might speed up the commercialization of organic lithium ion batteries.
Multifunctional dopamine-assisted preparation of efficient and stable perovskite solar cells

Perovskite solar cells (PSCs) show great potential for next-generation photovoltaics, due to their excellent optical and electrical properties. However, defects existing inside the perovskite film impair both the performance and stability of the device. Uncoordinated Pb~(2+), uncoordinated I-, and metallic Pb (Pb0) are the main defects occur during perovskite film preparation and device operation, due to the volatilization of organic cationic components. Passivating these defects is a desirable task, because they are non-radiative recombination centers that cause open-circuit voltage (VOC) loss and degradation of the perovskite layer. Herein, the multifunctional bioactive compound dopamine (DA) is introduced for the first time to control the perovskite film formation and passivate the uncoordinated Pb~(2+) defects via Lewis acid-base interactions. The Pb0 and I- defects are effectively suppressed by the DA treatment. At the same time, the DA treatment results in a stronger crystal orientation along the (110) plane and upshifts the valence band of perovskite closer to the highest occupied molecular orbital (HOMO) of the hole transport layer (2,20,7,70-tetrakis(N,N0-di-pmethoxyphenylamine)-9,90-spirobifluorene, spiro-OMeTAD), which is beneficial for charge separation and transport processes. Consequently, the stability of MAPbI_3 (MA = CH3NH_3) PSCs prepared with the DA additive (especially the thermal stability) is effectively improved due to the better crystallinity and lower number of defect trap states of the perovskite film. The optimized MAPbI_3 PSCs maintain approximately 90% of their original power conversion efficiency (PCE) upon annealing at 85 ℃ for 120 h. The best performance triple-cation perovskite (Cs_(0.05)(FA_(0.83)MA_(0.17))_(0.95)Pb(I_(0.83)Br_(0.17))_3) (FA = formamidinium) solar cell with ITO/SnO_2/ Cs_(0.05)(FA_(0.83)MA_(0.17))_(0.95)Pb(I_(0.83)Br_(0.17))_3:DA/spiro-OMeTAD/MoO_3/Ag (ITO = indium tin oxide) structure shows a PCE of 21.03% with negligible hysteresis, which is dramatically enhanced compared to that of the control device (18.31%). Therefore, this work presents a simple and effective way to improve the efficiency and stability of PSCs by DA treatment.
In-situ self-templated preparation of porous core-shell Fe_(1-x)S@N, S co-doped carbon architecture for highly efficient oxygen reduction reaction

Transition metal compound (TMC)/carbon hybrids, as prospering electrocatalyst, have attracted great attention in the field of oxygen reduction reaction (ORR). Their morphology, structure and composition often play a crucial role in determining the ORR performance. In this work, we for the first time report the successful fabrication of porous core-shell Fe_(1-x)S@N, S co-doped carbon (Fe_(1-x)S@NSC-t, t represents etching time) by a novel in-situ self-template induced strategy using Fe_3O_4 nanospheres and pyrrole as sacrificial self-template. The post-polymerization of pyrrole can be accomplished by the Fe~(3+) released through the etching of Fe_3O_4 by HCl acid. Thus, the etching time has a significant effect on the morphology, structure, composition and ORR performance of Fe_(1-x)S@NSC-t. Based on the characterizations, we find Fe_(1-x)S@NSC-24 can realize effective and balanced combination of Fe1-xS and NSC, possessing porous core-shell architecture, optimized structure defect, specific surface area and doped heteroatoms configurations (especially for pyridinic N, graphiticNand Fe-N structure). These features thus lead to outstanding catalytic activity and cycling stability towards ORR. Our work provides a good guidance on the design of TMC/ carbon-based electrodes with unique stable morphology and optimized structure and composition.
Pampas grass-inspired FeOOH nanobelts as high performance anodes for sodium ion batteries

High-performance materials are the key to developing new alternative energy-storage systems. Sodium ion batteries (SIBs) are regarded as the promising large-scale electric energy storage owing to the high abundance and low cost of sodium resources. However, the sluggish kinetics of Na~+ caused by the large-sized Na~+ (1.02 A) result in the lower energy density and unsatisfactory electrochemical properties. Till now, anode materials used for SIBs include carbonaceous materials, titanium-based materials, metallic alloys, metal sulfides and transition metal oxides. Among them, transition metal oxides have gained extensive attention due to the high theoretical capacity. In particular, FeOx based materials are widely explored in SIBs owing to their abundant resource, low cost and environmentfriendly nature.
Advances in in-situ characterizations of electrode materials for better supercapacitors

In past decades, the performance of supercapacitors has been greatly improved by rationalizing the electrode materials at the nanoscale. However, there is still a lack of understanding on how the charges are efficiently stored in the electrodes or transported across the electrolyte/electrode interface. As it is very challenging to investigate the ion-involved physical and chemical processes with single experiment or computation, combining advanced analytic techniques with electrochemical measurements, i.e., developing in-situ characterizations, have shown considerable prospect for the better understanding of behaviors of ions in electrodes for supercapacitors. Herein, we briefly review several typical in-situ techniques and the mechanisms these techniques reveal in charge storage mechanisms specifically in supercapacitors. Possible strategies for designing better electrode materials are also discussed.
Reversible potassium storage in ultrafine CF_x: A superior cathode material for potassium batteries and its mechanism

Current studies of cathodes for potassium batteries (PBs) mainly focus on the intercalation-type materials. The conversion-type materials that possess much higher theoretical capacities are rarely discussed in previous literatures. In this work, carbon fluoride (CF_x) is reported as a high capacity conversion-type cathode for PBs for the first time. The material delivers a remarkable discharge capacity of >250 mAh g~(-1) with mid-voltage of 2.6 V at 20 mA g~(-1). Moreover, a highly reversible capacity of around 95 mAh g~(-1) is achieved at 125 mA g~(-1) and maintained for 900 cycles, demonstrating its excellent cycling stability. The mechanism of this highly reversible conversion reaction is further investigated by nuclear magnetic resonance spectra, X-ray diffraction, and transmission electron microscopy studies. According to the analyses, the C-F bond in the cycled material is different from that in the pristine state, which presents relatively higher reversibility. This finding offers important insights for further improving the performance of the CF_x. This work not only demonstrates the CF_x as a high performance cathode for PBs, but also paves a new avenue of exploring conversion-type cathodes for high energy density PBs.
Recent advances in spinel-type electrocatalysts for bifunctional oxygen reduction and oxygen evolution reactions

The demand for efficient and environmentally-benign electrocatalysts that help availably harness the renewable energy resources is growing rapidly. In recent years, increasing insights into the design of water electrolysers, fuel cells, and metal-air batteries emerge in response to the need for developing sustainable energy carriers, in which the oxygen evolution reaction and the oxygen reduction reaction play key roles. However, both reactions suffer from sluggish kinetics that restricts the reactivity. Therefore, it is vital to probe into the structure of the catalysts to exploit high-performance bifunctional oxygen electrocatalysts. Spinel-type catalysts are a class of materials with advantages of versatility, low toxicity, low expense, high abundance, flexible ion arrangement, and multivalence structure. In this review, we afford a basic overview of spinel-type materials and then introduce the relevant theoretical principles for electrocatalytic activity, following that we shed light on the structure-property relationship strategies for spinel-type catalysts including electronic structure, microstructure, phase and composition regulation, and coupling with electrically conductive supports. We elaborate the relationship between structure and property, in order to provide some insights into the design of spinel-type bifunctional oxygen electrocatalysts.