Search query: sping coating BiVO4

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abstract: The performance of BiVO4 photoanodes, especially under front side illumination, is limited by the modest charge transport properties of BiVO4. Core/shell nanostructures consisting of BiVO4 coated onto a conductive scaffold are a promising route to improving the performance of BiVO4 based photoanodes. Here, we investigate photoanodes composed of thin and uniform layers of BiVO4 particles coated onto Sb doped SnO2 (Sb:SnO2) nanotube arrays that were synthesized using a sacrificial ZnO template with controllable length and packing density. We demonstrate a new record for the product of light absorption and charge separation efficiencies (eabs x esep) of ~57.3 and 58.5% under front and back side illumination, respectively, at 0.6 VRHE. Moreover, both of these high eabs x esep efficiencies are achieved without any extra treatment or intentional doping in BiVO4. These results indicate that integration of Sb:SnO2 nanotube cores with other successful strategies such as doping and hydrogen treatment can increase the performance of BiVO4 and related semiconductors closer to their theoretical potential.
author_names: Lite Zhou

Yang Yang

Jing Zhang

Pratap M Rao
title: Photoanode with Enhanced Performance Achieved by Coating BiVO4 onto ZnO Templated Sb Doped SnO2 Nanotube Scaffold.
venue: ACS applied materials interfaces
year: 2017

abstract: Abstract This work focuses on developing a novel photoelectrocatalytic (PEC) cell combined with a solar cell for the highest efficiency, simplest process, and most energy savings to degrade organic dyes in wastewater. FTO/WO3/BiVO4 photoanode electrode fabrication was developed with the simple layer by layer dip coating method, which allows production to be scaled up in the future. The fabricated WO3/BiVO4 shows thin film properties of high porosity, good visible light absorption, and ability to cover the entire FTO substrate area. The developed FTO/WO3/BiVO4 electrode exhibits high oxidation activity and high durability, and it can be applied to the PEC cell prototype by working under the catalytic mechanism of light irradiation and bias potential for organic dye degradation. The novel PEC cell was especially designed to include a solar cell to convert light into electrical energy that is stored in batteries for potential bias at the anode electrode and to supply electricity to the light irradiated electrode and solar cell panel under the electrical circuit's controller. The result shows that the developed PEC cell prototype can operate on its own without using external power and is able to degrade methylene blue and rhodamine B dyes up to 94% and 93% in 3 h, respectively. This research provides a novel, innovative PEC cell prototype that is highly effective at removing various organic dye substances, uses a simple method, offers an energy saving process, and is a very interesting way to further a large industrial dye wastewater treatment system.
author_names: Watcharapong Nareejun

Chatchai Ponchio
title: Novel photoelectrocatalytic/solar cell improvement for organic dye degradation based on simple dip coating WO3/BiVO4 photoanode electrode
year: 2020

abstract: Abstract The tungsten oxide (WO3) were fabricated by thermal decomposition method, with help of precursor Ammonium meta tungstate (AMT) Bismuth vanadate (BiVO4) was formed by sol gel based dip coating method. WO3/BiVO4 heterojunction, was formed by spin coating BiVO4 on WO3 surface. The number of layers in BiVO4 on WO3 coated substrate was varied. As prepared films were characterized by scanning electron microscopy (SEM) UV vis absorption, x ray diffraction (XRD) Photoelectrochemical (PEC) tests such as linear sweep voltammetry (LSV) electrochemical impendence spectroscopy (EIS) and chronoamperometeric tests were performed for WO3, BiVO4, and WO3/BiVO4 heterojunction structure. It was found that WO3/BiVO4 heterojunction produced higher photocurrent density than other photoanodes. It was also observed that the heterojunction showed an enhanced light absorption and charge separation process thus improving the overall performance of the photoelectrochemical (PEC) cell.
author_names: S R Sitaaraman

M I Shanmugapriyan

Krishnamoorthy Varunkumar

Andrews Nirmala Grace

Raja Sellappan
title: Synthesis of heterojunction tungsten oxide (WO3) and Bismuth vanadate (BiVO4) photoanodes by spin coating method for solar water splitting applications
year: 2020

abstract: Abstract BiVO4 nanowire array is fabricated by a hydrothermal method, and the nanowire array and a lithium foil are used as working and counter electrodes, respectively, to assemble a lithium ion battery. After charging to 4 V, the BiVO4 nanowire array has a strong oxidizing property. The pyrrole can be in situ polymerized on the surface of the charged BiVO4 nanowire array to form a polypyrrole coating layer in pyrrole solution. The morphology and structure properties of the samples are characterized and analyzed in detail. The lithium storage performances of the samples are also measured and compared. The obtained BiVO4 PPy nanowires have stable cycle performance and a discharge capacity of more than 400 mAh g 1 after 50 cycles. This work provides a new method for synthesizing conductive polymers on charged electrodes.
author_names: Dong Fang

Mengmeng Cui

Rui Bao

Jian-hong Yi

Zhiping Luo
title: In situ coating polypyrrole on charged BiVO4 nanowire arrays to improve lithium ion storage properties
year: 2020

abstract: Abstract Now a days, thermochromic materials have gained the interest of scientific community because of their diverse applications. Bismuth vanadate (BiVO4) is a promising candidate for thermochromic application. In the present work, we report on the thermochromism of m BiVO4 films prepared by a modified citrate route of simple sol gel spin coating method, for the first time. X ray diffraction (XRD) study witnesses the formation of monoclinic structure of BiVO4 films. From the Raman study, the symmetric (Ag) and the anti symmetric (Bg) of V O stretching and bending modes of BiVO4 are confirmed. The highest transmittance of 95% is obtained in the near infrared region. The Urbach energy, steepness parameter and strength of electron phonon interactions are extracted from the optical data and correlated with other measurements. The films possess the petal like morphology throughout the substrate. The temperature induced reversible colour change of the films (from yellow to reddish orange) clearly demonstrates the thermochromic behaviour of BiVO4 films. This may be due to the annealing temperature induced variation in structural distortion of BiVO4 from monoclinic to tetragonal phase.
author_names: R Vignesh

V P Brintha Mathy

G V Geetha

R Sivakumar

Chinnappa Sanjeeviraja
title: Temperature induced thermochromism of m BiVO4 thin films prepared by sol gel spin coating technique
year: 2020

abstract: Achieving enhanced photoelectrochemical (PEC) activity and stability of a photoanode remains as a formidable challenge. In this study, a porous tannin nickel iron complex coated WO3/BiVO4 heterojun.
author_names: Huan-huan Sun

Weibo Hua

Yueying Li

Jian-Gan Wang
title: Promoting Photoelectrochemical Activity and Stability of WO3/BiVO4 Heterojunctions by Coating a Tannin Nickel Iron Complex
year: 2020

abstract: Photoelectrochemical water splitting is an environmentally benign way to store solar energy. Properties such as fast charge recombination and poor charge transport rate severely restrict the use of BiVO4 as a photoanode for photoelectrochemical water splitting and many attempts were made to improve the current performance limit of the photoanode. To address these disadvantages, a highly efficient BiVO4/Bi2S3 heterojunction was fabricated applying facial anion exchange (AE) and successive ionic layer adsorption and reaction (SILAR) The deposition of Bi2S3 on BiVO4 nanoworms by both AE and SILAR was confirmed through morphological, structural, and optical analyses. The morphological analysis indicated that Bi2S3 grown through SILAR has relatively more crystalline amorphous phase boundaries than Bi2S3 generated using the anion exchange method. The highest photocurrent density was observed for the SILAR coated Bi2S3 on BiVO4, which is three times the value of the pristine BiVO4 measured under 1 sun illumination (100 mW cm 2 with Air mass (AM) 1.5 filter) in a 0.5 M Na2SO4 electrolyte at 1.6 V vs. RHE. In addition, the deposition of Bi2S3 through AE results in a twofold higher photocurrent density compared to uncoated BiVO4. The comparison of the two cost effective AE and SILAR methods to deposit Bi2S3 on BiVO4 showed a negative shift in the flat band Mott Schottky values, which coincides with the drifted onset potential values of the current density voltage (J V) curve. Furthermore, photoelectrochemical impedance spectroscopy (PEIS) analyses and band alignment studies revealed that SILAR grown Bi2S3 creates an effective heterojunction with BiVO4, which leads to an efficient charge transfer.
author_names: Sutripto Majumder

Nguyen Duc Quang

Chunjoong Kim

Dojin Kim
title: Anion exchange and successive ionic layer adsorption and reaction assisted coating of BiVO4 with Bi2S3 to produce nanostructured photoanode for enhanced photoelectrochemical water splitting.
venue: Journal of colloid and interface science
year: 2020

abstract: Abstract Bismuth vanadate (BiVO4) has been regarded as a promising photoanode material for photoelectrochemical (PEC) water splitting owing to its low cost, and small band gap energy ~2.4 eV) However, the achieved current density of the BiVO4 photoanode remains far below its theoretical value ~7.5 mA cm 2) because of its severe surface charge recombination. Herein, a simple process is developed for preparing a new type of low cost metal organic coordination composed of tannic acid coordinated with Co ions (TACo) as an efficient cocatalyst to suppress the charge carrier recombination on BiVO4 photoanodes. For the BiVO4/TACo photoanode, a high photocurrent density of 4.8 mA cm 2 was achieved at 1.23 V (vs. reversible hydrogen electrode (RHE) AM 1.5 G) which approximately 3 fold higher than that of bare BiVO4. Systematic studies reveal that the enhanced water oxidation performance of BiVO4/TACo photoanode can be ascribed to the synergistic effect of following factors: (i) For the thermodynamic process, the photogenerated holes are directly transferred to TACo layer; (ii) For the kinetic process, the transferred holes can directly oxidied Co2+ to generate Co3+ active sites, which could directly oxidize H2O to molecular O2. This work provides a new tool kit for designing efficient water oxidation PECs.
author_names: Tian Tian

Congzhao Dong

Xiangming Liang

Meie Yue

Yong Ding
title: Enhanced photoelectrochemical water oxidation activity of BiVO4 by coating of Co phenolic networks as hole transfer and co catalyst
venue: Journal of Catalysis
year: 2019

abstract: Abstract Monoclinic BiVO4 (m BiVO4) thin films were deposited on the ZnO nanorod arrays (NRAs) for constructing a core/shell composite photoanode, leading to a significantly enhanced photoelectrochemical (PEC) performance. Specifically, the ZnO/BiVO4 NRA sample displayed a photocurrent density of 2.3 mA/cm2 at 0.6 V vs. RHE under a visible light irradiation (100 mA/cm2) while the value was just 0.9 mA/cm2 for a ZnO NRA and 0.8 mA/cm2 for a BiVO4 film. The enhanced PEC activity was mainly attributed to the role of ZnO nanorods as a rapid electron transport pathway, which could be also versified by the electrochemical impedance analysis (including the Nyquist and Mott Schottky plots) Furthermore, a PEC biosensor was fabricated by using a ZnO/BiVO4 NRA photoanode, leading to an acceptable sensitivity of 450 mA*cm 2*M 1 and a detection limit of 0.11 mM, respectively.
author_names: Xiao Huang

Jian Song

Linmeng Wang

Xiuquan Gu

Yulong Zhao

Yinghuai Qiang
title: Photoelectrochemical properties of ZnO/BiVO4 nanorod arrays prepared through a facile spin coating deposition route
venue: Materials Science in Semiconductor Processing
year: 2019

abstract: Abstract Two highly thermal stable clay mineral based bismuth yellow hybrid pigments were facilely fabricated combining with precipitation and annealing processes using halloysite and kaolin, respectively. The color properties, crystalline phase, morphology, and thermal stability of hybrid pigments were studied. Incorporation of clay minerals not only greatly decreased the production cost of bismuth yellow, but also improved its color properties and thermal stability. After clay mineral based bismuth yellow hybrid pigments were introduced into polypropylene, the obtained composites exhibited the good mechanical properties compared with polypropylene and polypropylene reinforced with bismuth yellow, which was mainly attributed to the synergistic effect between clay minerals and bismuth yellow. It suggested that the as prepared bismuth yellow hybrid pigments could be simultaneously served as a promising colorant and toughening and strengthening materials to be applied in plastic. In addition, the bismuth yellow hybrid pigments also presented the outstanding flame retardancy after being coated on polyurethane foam.
author_names: Xiaowen Wang

Bin Mu

Zhe Zhang

Aiqin Wang
title: Insights into halloysite or kaolin role of BiVO4 hybrid pigments for applications in polymer matrix and surface coating
venue: Composites Part B: Engineering
year: 2019