Stable hydrogen generation from Ni- and Co-based co-catalysts in supported CdS PEC cell

2016 ◽  
Vol 45 (27) ◽  
pp. 11120-11128 ◽  
Author(s):  
Alka Pareek ◽  
Pradip Paik ◽  
Pramod H. Borse
Keyword(s):  
Water Oxidation ◽  
Hydrogen Generation ◽  
Co Catalysts

Schematic summarizing CdS photoanode modification by nano Ni(OH)2, NiO, Co(OH)2, and Co3O4 water-oxidation co-catalysts resulting in enhancement of stability of photoelectrochemical (PEC) cell electrodes for >8 h. The NiO modified photoanode yields large PEC H2-evolution of 2.5 mmol h−1.

scholarly journals The effect of nanoparticulate PdO co-catalysts on the faradaic and light conversion efficiency of WO3 photoanodes for water oxidation

2021 ◽  
Author(s):  
Anna A. Wilson ◽  
Sacha Corby ◽  
Laia Francàs ◽  
James R. Durrant ◽  
Andreas Kafizas
Keyword(s):  
Conversion Efficiency ◽  
Water Oxidation ◽  
Faradaic Efficiency ◽  
Co Catalysts ◽  
Photocurrent Generation ◽  
Light Conversion Efficiency ◽  
Electron Extraction

PdO nanoparticles grown on the surface of nanostructured WO3 photoanodes dramatically increase the faradaic efficiency of water oxidation from 52% to 92%, whilst also enhancing photocurrent generation and electron extraction rates.

scholarly journals Thickness-dependent photoelectrochemical properties of a semitransparent Co3O4 photocathode

2018 ◽  
Vol 9 ◽  
pp. 2432-2442 ◽  
Author(s):  
Malkeshkumar Patel ◽  
Joondong Kim
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Hydrogen Generation ◽  
Hydrogen Gas ◽  
Generation Rate ◽  
Alkaline Electrolyte ◽  
Stoichiometric Ratio ◽  
Gas Generation ◽  
Pec Cells ◽  
Gas Generation Rate

Co3O4 has been widely studied as a catalyst when coupled with a photoactive material during hydrogen production using water splitting. Here, we demonstrate a photoactive spinel Co3O4 electrode grown by the Kirkendall diffusion thermal oxidation of Co nanoparticles. The thickness-dependent structural, physical, optical, and electrical properties of Co3O4 samples are comprehensively studied. Our analysis shows that two bandgaps of 1.5 eV and 2.1 eV coexist with p-type conductivity in porous and semitransparent Co3O4 samples, which exhibit light-induced photocurrent in photoelectrochemical cells (PEC) containing the alkaline electrolyte. The thickness-dependent properties of Co3O4 related to its use as a working electrode in PEC cells are extensively studied and show potential for the application in water oxidation and reduction processes. To demonstrate the stability, an alkaline cell was composed for the water splitting system by using two Co3O4 photoelectrodes. The oxygen gas generation rate was obtained to be 7.17 mL·h−1 cm−1. Meanwhile, hydrogen gas generation rate was almost twice of 14.35 mL·h−1·cm−1 indicating the stoichiometric ratio of 1:2. We propose that a semitransparent Co3O4 photoactive electrode is a prospective candidate for use in PEC cells via heterojunctions for hydrogen generation.

scholarly journals Electrospun metal and metal alloy decorated TiO2 nanofiber photocatalysts for hydrogen generation

RSC Advances ◽  
2018 ◽  
Vol 8 (57) ◽  
pp. 32865-32876 ◽  
Author(s):  
Courtney Ligon ◽  
Kaniece Latimer ◽  
Zachary D. Hood ◽  
Sanuja Pitigala ◽  
Kyle D. Gilroy ◽  
...  
Keyword(s):  
Hydrogen Generation ◽  
Metal Alloy ◽  
Co Catalysts ◽  
Photocatalytic Hydrogen Generation ◽  
Tio2 Nanofiber

Photocatalytic hydrogen generation by electrospun TiO2 nanofibers decorated with various co-catalysts (Pt2Pd, PtCu, Cu, Pt, Pd) was explored.

Preparation of ZnFe2O4 nanostructures and highly efficient visible-light-driven hydrogen generation with the assistance of nanoheterostructures

2015 ◽  
Vol 3 (16) ◽  
pp. 8353-8360 ◽  
Author(s):  
Hui Song ◽  
Liping Zhu ◽  
Yaguang Li ◽  
Zirui Lou ◽  
Mu Xiao ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Hydrogen Generation ◽  
Light Irradiation ◽  
Generation Rate ◽  
Template Method ◽  
Co Catalysts ◽  
Highly Efficient ◽  
Visible Light Driven

ZnFe2O4/ZnO nanoheterostructures are synthesized by a facile template method. The hydrogen generation rate of ZnFe2O4/ZnO nanoheterostructures without co-catalysts is up to 2.15 mmol h−1 g−1 under visible light irradiation (λ > 420 nm), which is 45 times higher than the best yields ever reported for ZnFe2O4-based photocatalysts.

Photoelectrochemical studies on earth abundant pentanickel polyoxometalates as co-catalysts for solar water oxidation

2018 ◽  
Vol 2 (4) ◽  
pp. 827-835 ◽  
Author(s):  
Arun Sridhar Siddarth ◽  
Wujian Miao
Keyword(s):  
Water Oxidation ◽  
Zero Bias ◽  
First Report ◽  
Solar Water ◽  
Co Catalysts ◽  
Earth Abundant ◽  
Solar Water Oxidation ◽  
Photoelectrochemical Studies

This is the first report on a FTO/TiO2–Ni5-POM system, and results obtained display a notable zero bias photocurrent.

scholarly journals Visible light-driven simultaneous water oxidation and quinone reduction by a nano-structured conjugated polymer without co-catalysts

2020 ◽  
Vol 11 (28) ◽  
pp. 7324-7328
Author(s):  
Jully Patel ◽  
Xiaojiao Yuan ◽  
Stéphanie Mendes Marinho ◽  
Winfried Leibl ◽  
Hynd Remita ◽  
...  
Keyword(s):  
Visible Light ◽  
Conjugated Polymers ◽  
Water Oxidation ◽  
Conjugated Polymer ◽  
Co Catalysts ◽  
Quinone Reduction ◽  
Visible Light Driven ◽  
Light Excitation ◽  
Charge Recovery

Nanostructured conjugated polymers of diphenylbutadiyne (nano-PDPB) can perform photocatalytic water oxidation under visible light excitation. Charge recovery delayed in time was exemplified by the reduction of quinone acting as a hydrogen reservoir.

Decoupling Hydrogen Production and Water Oxidation in a Hybrid Solar-Driven Vanadium Redox Cell Supported By a Bipolar Membrane with Earth-Abundant Catalysts

2018 ◽  
Vol MA2018-01 (31) ◽  
pp. 1864-1864
Author(s):  
Chengxiang("CX") Xiang
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Cathode Surface ◽  
Hydrogen Generation ◽  
Anode Surface ◽  
Faradaic Efficiency ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Hydrogen Molecules ◽  
Vanadium Redox

Renewable hydrogen produced by solar water-splitting has the potential to balance the intermittent nature of the sunlight and support grid-scale energy storage. In a solar-driven water-splitting device, the cathode surface and the anode surface involve hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which are tightly coupled with each other, that is, whenever one oxygen molecule was produced at the cathode surface, two hydrogen molecules were produced at the anode surface at the same time. In this talk, I will show some recent results on an alternative approach to solar water-splitting, where the electron and proton generated at OER was used to charge an aqueous vanadium solution in a 2.0 M sulfuric acid (pH = -0.16) electrolyte with near unity Faradaic efficiency, rather than being used directly to produce hydrogen at the cathode. The produced V2+ species in the cathode chamber was then passed through a MoCx based catalyst to produce hydrogen and to re-generate V3+ for the subsequent reduction, with an average hydrogen generation efficiency of 85% at different depths of charging. Coupled to a solar tracker, the solar-driven vanadium redox cell was charged outdoors under real-world illumination during the day and discharged at night to produce hydrogen with a daily average solar to hydrogen (STH) conversion efficiency of 5.8%.

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