Search query: CuInS2

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abstract: Abstract It is still a great challenge to effectively optimize the electronic structure of photocatalysts for the sustainable and efficient conversion of solar energy to H2 energy. To resolve this issue, we report on the optimization of the electronic structure of hollow concave carbon nitride (C3N4) by deviating the sp2 hybridized structure of its tri s triazine component from the two dimensional plane. The embedded CuInS2 into C3N4 (CuInS2@C3N4) demonstrates an increased light capturing capability and the promoted directional transfer of the charge carrier. Research results reveal that the hollow structure with an apparent potential difference between the concave and convex C3N4 drives the directional transfer of the photoinduced electrons from the Cu 2p orbital of CuInS2 to the N 1s orbital of C3N4 with the S scheme principle. The H2 evolution efficiency over CuInS2@C3N4 is up to 373 umol*h 1 g 1 under visible irradiation, which is 1.57 and 1.35 times higher than those over the bulk g C3N4 with 1 wt% Pt (238 umol*h 1 g 1) and g C3N4 with 3 wt% Pd (276 umol*h 1 g 1) respectively. This suggests that the apparent potential difference of the hollow C3N4 results in an efficient reaction between the photogenerated electrons and H2O. This work supplies a new strategy for enhancing the sustainable solar conversion performance of carbon nitride, which can also be suitable for other semiconductors.
author_names: Jinhua Luo

Zhexing Lin

Yan Zhao

Shujuan Jiang

Shaoqing Song
title: The embedded CuInS2 into hollow concave carbon nitride for photocatalytic H2O splitting into H2 with S scheme principle
year: 2020

abstract: Abstract A signal on photoelectrochemical (PEC) biosensor was successfully established for the sensitive monitoring of carcinoembryonic antigen (CEA) by using copper indium disulfide sensitized graphitic like carbon nitride (g C3N4/CuInS2) as the photosensitive material and cobalt oxyhydroxide (CoOOH) as the light blocking material, coupling target triggered hybridization chain reaction (HCR) with hydrolysate induced dissolution/etching of CoOOH nanosheets. Initially, a sandwiched reaction occurred between capture aptamer conjugated magnetic bead and trigger aptamer in the presence of CEA. Then, the carried trigger aptamer initiated HCR between two hairpin sequences to produce long double helix strand for capturing alkaline phosphatase. The generated ascorbic acid reduced/etched CoOOH nanosheets into divalent cobalt ions, which decreased the amount and thickness of CoOOH and exposed the underlying g C3N4/CuInS2, thus leading to a distinct increase in the photocurrent. Under optimum conditions, PEC sensor showed high sensitivity toward CEA with a dynamic range of 0.02 40 ng mL 1 and a detection limit of 5.2 pg mL 1. Also, it possessed favorable selectivity, high stability as well as good precision. The accuracy of PEC approach was well consistent with commercial CEA ELISA kit. These exceptional analytical performances of PEC biosensor indicated that it might have a broad application prospect in the diagnosis of CEA.
author_names: Kangyao Zhang

Shuzhen Lv

Qian Zhou

Dianping Tang
title: CoOOH nanosheets coated g C3N4/CuInS2 nanohybrids for photoelectrochemical biosensor of carcinoembryonic antigen coupling hybridization chain reaction with etching reaction
year: 2020

abstract: Abstract Photocatalysis is one of the most promising technologies owing to its great potential to relieve energy and environmental issues. Constructing Z scheme heterojunction photocatalyst with strong redox ability to make for enhanced light absorption and efficient charge separation is extremely attractive but still underdeveloped. Herein, Z scheme heterojunction of CuInS2/g C3N4 with a "sheet on sheet" hierarchical structure showing enhanced photocatalytic performance for the tetracycline (TC) degradation under visible light irradiation has been developed. This 2D/2D hierarchical structure of CuInS2/g C3N4 composite not only enlarges the contact region in the heterojunction interface but also provides more active reaction sites, as demonstrated by the TEM and BET analyses. Particularly, 50 wt% CuInS2/g C3N4 heterojunction shows the highest photocatalytic activity (20 mg/L; 83.7% degradation within 60 min) which the apparent rate constant is 15 and 11 times higher than that of pure g C3N4 and CuInS2 nanosheets, respectively. The remarkably enhanced photocatalytic activity mainly derives from the synergistic effect between CuInS2 and g C3N4, thereby promoting the charge separation during the photocatalytic reaction. This work is expected to provide a design idea to construct multifunctional 2D/2D nanocomposites for photocatalytic applications.
author_names: Feng Guo

Weilong Shi

Mingyang Li

Yuxing Shi

Huabing Wen
title: 2D/2D Z scheme heterojunction of CuInS2/g C3N4 for enhanced visible light driven photocatalytic activity towards the degradation of tetracycline
venue: Separation and Purification Technology
year: 2019

abstract: Abstract A series of visible light driven direct Z scheme CdS/CuInS2 nanoplates were fabricated by a facile one step hydrothermal method, and the molar ratio of CdS to CuInS2 was optimized. The highest visible light photocatalytic degradation activity of Z scheme (1:0.03) CdS/CuInS2 heterojunction is about 4 times than that of pure CuInS2, which is due to the narrowest band gap, the largest BET surface area, the most efficient charge separation and transfer, and the synergistic effect between CdS and CuInS2. Meanwhile, Z scheme (1:0.03) CdS/CuInS2 heterojunction also exhibits excellent photocatalytic reduction activity with almost 100% of aqueous Cr(VI) reduction efficiency in absence of hole scavengers after 60 min. The special significance is that Z scheme (1:0.03)CdS/CuInS2 heterojunction shows excellent stability in five degradation cycles, and can effectively treat real pharmaceutical wastewater with 76.5% COD removal efficiency with aid of H2O2 in 13 h, indicating that Z scheme CdS/CuInS2 has a promising prospect in real pharmaceutical wastewater treatment.
author_names: Fang Deng

Xiaoying Lu

Yingbo Luo

Jie Wang

Wenjie Che

Ruijie Yang

Xubiao Luo

Shenglian Luo

Dionysios D Dionysiou
title: Novel visible light driven direct Z scheme CdS/CuInS2 nanoplates for excellent photocatalytic degradation performance and highly efficient Cr(VI) reduction
venue: Chemical Engineering Journal
year: 2019

abstract: Abstract The pollution of pharmaceutical wastewater has attracted global attention. Photocatalysis is an attractive yet challenging method for the degradation of pharmaceutical residues. Fabricating efficient Z scheme heterojunctions with intimate interface contact for enhancing the performance of photocatalysts is a challenge. Herein, novel visible light driven direct Z scheme CuInS2/Bi2WO6 heterojunctions with intimate interface contact were successfully synthesized by in situ hydrothermal growth of Bi2WO6 directly on the surface of CuInS2 network like microspheres, and the content of CuInS2 was optimized. The photocatalytic activity of optimal Z scheme 15% CuInS2/Bi2WO6 for the degradation of tetracycline hydrochloride (TC*HCl) is more than three times that of bare CuInS2 and 17% higher than that of Bi2WO6, which is attributed that the intimate interface contact can assure excellent interfacial charge transfer abilities. Moreover, Z scheme CuInS2/Bi2WO6 heterojunctions are highly stable with no inactivation in photocatalytic cycles. More importantly, real pharmaceutical industry wastewater can be efficiently disposed by Fenton aided photocatalysis of Z scheme CuInS2/Bi2WO6 heterojunctions with COD removal efficiency being 90.5% which is much higher than the reported results, and thus sets a new performance benchmark for practical application in real pharmaceutical wastewater treatment.
author_names: Xiaoying Lu

Wenjie Che

Xiufen Hu

Yi Wang

Aiting Zhang

Fang Deng

Shenglian Luo

Dionysios D Dionysiou
title: The facile fabrication of novel visible light driven Z scheme CuInS2/Bi2WO6 heterojunction with intimate interface contact by in situ hydrothermal growth strategy for extraordinary photocatalytic performance
year: 2019

abstract: Abstract In order to improve the water splitting efficiency of CuInS2 in a photoelectrochemical (PEC) cell, the novel CuInS2/Sb2S3 heterostructure photocathodes modified with Pt noble metal co catalyst were prepared on the ITO substrate by the hydrothermal and electrochemical deposition method for the first time. The mechanism of the synthesis reaction for the CuInS2/Sb2S3 and CuInS2/Sb2S3/Pt were investigated. With the photoelectrochemical measurements, the photocurrent density of CuInS2/Sb2S3/Pt photoelectrode 2.48 mA/cm2 at 0.6 V vs. RHE) is about 3.13 times relatively higher than that of the corresponding the pure CuInS2 photoelectrode 0.79 mA/cm2 at 0.6 V vs. RHE) The excellent PEC behaviors profit from the modification by Sb2S3 that forms the heterostructure which broadens the response of visible light and increases the separation and transfer of photo generated carriers. Moreover, after introducing Pt co catalyst onto the surface of CuInS2/Sb2S3 photoelectrode, photo generated electrons can be captured quickly which further effectively promotes the separation of photo generated carriers and greatly improve the PEC performance. This work manifests that the structure of CuInS2/Sb2S3/Pt photocathodes has a guiding suggestion to provide a promising approach to designing a highly stabilized efficient device for photoelectrochemical water splitting.
author_names: Qijun Cai

Zhifeng Liu

Zhengfu Tong

Chonghao Ma
title: CuInS2/Sb2S3 heterostructure modified with noble metal co catalyst for efficient photoelectrochemical water splitting
venue: Journal of Alloys and Compounds
year: 2019

abstract: Developing photocatalysts with a high efficiency charge separation remains a challenge in the solar hydrogen production. Herein, we devised and prepared a unique 2D/2D heterojunction of CuInS2/ZnIn2S4 nanosheets for solar hydrogen evolution. Structural characterizations reveal that the CuInS2/ZnIn2S4 2D/2D heterojunction with lattice match consists of the thin thickness of nanosheets and has a large interface contact area, boosting charges transfer and separation. Benefiting from the favorable 2D/2D heterojunction structure, the CuInS2/ZnIn2S4 2D/2D heterojunction photocatalyst with 5 wt CuInS2 yields the highest H2 evolution rate of 3430.2 mmol*g 1*h 1. In addition, the apparent quantum efficiency of 5%CuInS2/ZnIn2S4 2D/2D heterojunction reaches 12.4% at 420 nm, which is high among the ZnIn2S4 based 2D/2D heterojunctions. The enhanced photocatalytic H2 evolution comes from the boosting charge separation. This work demonstrates that a 2D/2D heterojunction provides a potential way for significantly impro.
author_names: Zhongjie Guan

Jingwen Pan

Qiuye Li

Guoqiang Li

Jianjun Yang
title: Boosting Visible Light Photocatalytic Hydrogen Evolution with an Efficient CuInS2/ZnIn2S4 2D/2D Heterojunction
venue: ACS Sustainable Chemistry Engineering
year: 2019

abstract: Abstract Photocatalytic CO2 reduction into solar fuels over photocatalysts has theoretically and practically become a hot research topic. Herein, we fabricated a novel hybrid TiO2 nanofiber coated by CuInS2 nanoplates through a hydrothermal method. The materials were characterized by X ray diffraction, electron microscopes, UV vis absorption spectra, nitrogen sorption, X ray photoelectron spectroscopy and electrochemical impudence spectroscopy. The resulting TiO2/CuInS2 hybrid nanofibers exhibit superior photocatalytic activity for CO2 reduction under irradiation, due to the generation of direct Z scheme heterojunction between TiO2 and CuInS2. This work may provide an alternate methodology to design and fabricate multicomponent TiO2 based photocatalyst for high efficiency CO2 photoreduction.
author_names: Feiyan Xu

Jianjun Zhang

Bicheng Zhu

Jiaguo Yu

Jingsan Xu
title: CuInS2 sensitized TiO2 hybrid nanofibers for improved photocatalytic CO2 reduction
year: 2018

abstract: Rational architectural design and catalyst components are beneficial to improve the photoelectrochemical (PEC) performance. Herein, hierarchical SnS2/CuInS2 nanosheet heterostructure porous films were fabricated and decorated with C60 to form photocathodes for PEC water reduction. Large size CuInS2 nanosheet films were first grown on transparent conducting glass to form substrate films. Then, small size SnS2 nanosheets were epitaxially grown on both sides of the CuInS2 nanosheets to form uniform hierarchical porous laminar films. The addition of C60 on the surface of the SnS2/CuInS2 porous nanosheets effectively increased visible light absorption of the composite photocathode. Photoluminescence spectroscopy and impedance spectroscopy analyses indicated that the formation of a SnS2/CuInS2 heterojunction and decoration of C60 significantly increased the photocurrent density by promoting the electron hole separation and decreasing the resistance to the transport of charge carriers. The hierarchical SnS2/CuInS2 nanosheet heterostructure porous films containing multiscale nanosheets and pore configurations can enlarge the surface area and enhance visible light utilization. These beneficial factors make the optimized C60 decorated SnS2/CuInS2 photocathode exhibit much higher photocathodic current (4.51 mA cm 2 at applied potential 0.45 V vs reversible hydrogen electrode and stability than the individual CuInS2 (2.58 mA cm 2) and SnS2 (1.92 mA cm 2) nanosheet film photocathodes. This study not only reveals the promise of C60 decorated hierarchical SnS2/CuInS2 nanosheet heterostructure porous film photocathodes for efficient solar energy harvesting and conversion but also provides rational guidelines in designing high efficiency photoelectrodes from earth abundant and low cost materials allowing widely practical applications.
author_names: Fangfang Zhang

Yajie Chen

Wei Zhou

Can Ren

Haijing Gao

Guohui Tian
title: Hierarchical SnS2/CuInS2 Nanosheet Heterostructure Films Decorated with C60 for Remarkable Photoelectrochemical Water Splitting.
venue: ACS applied materials interfaces
year: 2019

abstract: Abstract Inspired by the unique structure and wide applications of zeolitic imidazolate frameworks 8 (ZIF 8) and CuInS2 (CIS) considerable attention has focused on the combination of both materials. We herein report a facial method for the homogeneous decoration of ZIF 8 onto the surfaces of CuInS2 (CIS) nanoparticles coordinated by polyvinyl pyrrolidone (PVP) in methanol. It has been shown that the coordination of PVP plays a key role in inducing the nucleation of ZIF 8 on the surface of CIS nanoparticles because of the pyrrolidone rings (C O) in PVP offering an improved affinity between CIS and Zn ions. Performing as a catalyst, the CIS@ZIF 8 nanocomposites not only exhibit high photocatalytic activity for the degradation of organic dye under UV light irradiation, but also largely maintain their catalytic efficiency after being recycled for five times compared with that of pure CIS nanoparticles.
author_names: Aiping Liu

Chao Yu

Jing Lin

Guanghui Sun

Guohai Xu

Yang Huang

Zhenya Liu

Chengchun Tang
title: Construction of CuInS2@ZIF 8 nanocomposites with enhanced photocatalytic activity and durability
venue: Materials Research Bulletin
year: 2019