DataVXACS Energy LettersPaper
journal article·2016-09-09Open access

Rate Law Analysis of Water Oxidation and Hole Scavenging on a BiVO4 Photoanode

Yimeng Ma, Camilo A. Mesa, Ernest Pastor, Andreas Kafizas, Laia Francàs, Florian Le Formal, Stephanie R. Pendlebury, James R. Durrant

ACS Energy Letters· Volume 1· Issue 3
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Source abstract

Abstract

Spectroelectrochemical studies employing pulsed LED irradiation are used to investigate the kinetics of water oxidation on undoped dense bismuth vanadate (BiVO 4 ) photoanodes under conditions of photoelectrochemical water oxidation and compare to those obtained for oxidation of a simple redox couple. These measurements are employed to determine the quasi-steady-state densities of surface-accumulated holes, p s, and correlate these with photocurrent density as a function of light intensity, allowing a rate law analysis of the water oxidation mechanism. The reaction order in surface hole density is found to be first order for p s < 1 nm –2 and third order for p s > 1 nm –2 . The effective turnover frequency of each surface hole is estimated to be 14 s –1 at AM 1.5 conditions. Using a single-electron redox couple, potassium ferrocyanide, as the hole scavenger, only the first-order reaction is observed, with a higher rate constant than that for water oxidation. These results are discussed in terms of catalysis by BiVO 4 and implications for material design strategies for efficient water oxidation.
Source: openalex_inverted_index · Quality: baseline

Research context

Catalysis & surfaces

OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · Copper-based nanomaterials and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom

Institute for Solar Fuels, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, Berlin 14109, Germany

Christopher Ingold Laboratories, Department of Chemistry, University College London, Gordon Street, London WC1H 0AJ, United Kingdom

Laboratory for Molecular Engineering of Optoelectronic Nanomaterials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH H4 565, Lausanne 1015, Switzerland

Funding

Departamento Administrativo de Ciencia, Tecnología e Innovación · Engineering and Physical Sciences Research Council · European Research Council · Directorate-General for Research and Innovation · Ramsay Memorial Fellowships Trust, University College London · Swiss National Science Foundation

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