Screening of Electrocatalysts for Photoelectrochemical Water Oxidation on W-Doped BiVO4 Photocatalysts by Scanning Electrochemical Microscopy
Citations Over TimeTop 10% of 2011 papers
Abstract
Oxygen evolution reaction (OER) electrocatalyst arrays for photoelectrochemical (PEC) water oxidation were fabricated on a metal oxide semiconductor photoelectrode, W-doped BiVO4 (BiVW-O). The electrocatalysts (IrOx, Pt, Co3O4) were prepared on a drop cast film of BiVW-O on fluorine-doped tin oxide (FTO) with a picoliter solution dispenser or photodeposition with light irradiation through an optical fiber. The prepared arrays were tested for PEC water oxidation in 0.2 M sodium phosphate buffer (pH 6.8) using scanning electrochemical microscopy modified with an optical fiber. Pt and Co oxide electrocatalysts showed an enhanced photocurrent for PEC water oxidation, while the other metal oxide catalysts including IrOx, which is known as an excellent water oxidation electrocatalyst on a metal substrate, were not effective. These results were confirmed with bulk film studies. A cobalt phosphate (Co-Pi) electrocatalyst was also tested as a bulk film on BiVW-O and showed improvement for PEC water oxidation. Preliminary characterization (X-ray diffraction and X-ray photoelectron spectroscopy) was also performed for these catalysts. The results indicate that considerations of the semiconductor photocatalyst/electrocatalyst interface are important in determining the effectiveness of materials for the photodriven OER.
Related Papers
- → Hierarchical NiCo2O4 Hollow Microcuboids as Bifunctional Electrocatalysts for Overall Water‐Splitting(2016)869 cited
- → Single Atoms and Clusters Based Nanomaterials for Hydrogen Evolution, Oxygen Evolution Reactions, and Full Water Splitting(2019)777 cited
- → Hierarchical NiCo2O4 Hollow Microcuboids as Bifunctional Electrocatalysts for Overall Water‐Splitting(2016)631 cited
- → Trimetallic oxyhydroxides as active sites for large-current-density alkaline oxygen evolution and overall water splitting(2021)139 cited
- → Efficient and stable photoelctrochemical water oxidation by ZnO photoanode coupled with Eu2O3 as novel oxygen evolution catalyst(2015)30 cited