Imperial College London
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Dr Steph Pendlebury

Faculty of Engineering

IMSE Institute Manager
 
 
 
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Contact

 

+44 (0)20 7594 0901s.pendlebury Website

 
 
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Location

 

Level 2 Office, Central LibraryAbdus Salam LibrarySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ma:2016:10.1021/acsenergylett.6b00263,
author = {Ma, Y and Mesa, CA and Pastor, E and Kafizas, A and Francas, L and Le, Formal F and Pendlebury, SR and Durrant, JR},
doi = {10.1021/acsenergylett.6b00263},
journal = {ACS Energy Letters},
pages = {618--623},
title = {Rate law analysis of water oxidation and hole scavenging on a BiVO4 photoanode},
url = {http://dx.doi.org/10.1021/acsenergylett.6b00263},
volume = {1},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Spectroelectrochemical studies employing pulsed LED irradiation are used to investigate the kinetics of water oxidation on undoped dense bismuth vanadate (BiVO4) 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, ps, 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 ps < 1 nm–2 and third order for ps > 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 BiVO4 and implications for material design strategies for efficient water oxidation.
AU  - Ma,Y
AU  - Mesa,CA
AU  - Pastor,E
AU  - Kafizas,A
AU  - Francas,L
AU  - Le,Formal F
AU  - Pendlebury,SR
AU  - Durrant,JR
DO  - 10.1021/acsenergylett.6b00263
EP  - 623
PY  - 2016///
SN  - 2380-8195
SP  - 618
TI  - Rate law analysis of water oxidation and hole scavenging on a BiVO4 photoanode
T2  - ACS Energy Letters
UR  - http://dx.doi.org/10.1021/acsenergylett.6b00263
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000389617900022&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/44387
VL  - 1
ER  -
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