Imperial College London
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DrAndreasKafizas

Faculty of Natural Sciences, Department of Chemistry

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6752a.kafizas Website

 
 
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Location

 

301GMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Mesa:2017:10.1021/jacs.7b05184,
author = {Mesa, Zamora CA and Kafizas, A and Francàs, L and Pendlebury, S and Pastor, E and Ma, Y and Le, Formal F and Mayer, M and Grätzel, M and Durrant, J},
doi = {10.1021/jacs.7b05184},
journal = {Journal of the American Chemical Society},
pages = {11537--11543},
title = {Kinetics of photoelectrochemical oxidation of methanol on hematite photoanodes},
url = {http://dx.doi.org/10.1021/jacs.7b05184},
volume = {139},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The kinetics of photoelectrochemical (PEC) oxidation of methanol, as a model organic substrate, on α-Fe2O3 photoanodes are studied using photoinduced absorption spectroscopy and transient photocurrent measurements. Methanol is oxidized on α-Fe2O3 to formaldehyde with near unity Faradaic efficiency. A rate law analysis under quasi-steady-state conditions of PEC methanol oxidation indicates that rate of reaction is second order in the density of surface holes on hematite and independent of the applied potential. Analogous data on anatase TiO2 photoanodes indicate similar second-order kinetics for methanol oxidation with a second-order rate constant 2 orders of magnitude higher than that on α-Fe2O3. Kinetic isotope effect studies determine that the rate constant for methanol oxidation on α-Fe2O3 is retarded ∼20-fold by H/D substitution. Employing these data, we propose a mechanism for methanol oxidation under 1 sun irradiation on these metal oxide surfaces and discuss the implications for the efficient PEC methanol oxidation to formaldehyde and concomitant hydrogen evolution.
AU  - Mesa,Zamora CA
AU  - Kafizas,A
AU  - Francàs,L
AU  - Pendlebury,S
AU  - Pastor,E
AU  - Ma,Y
AU  - Le,Formal F
AU  - Mayer,M
AU  - Grätzel,M
AU  - Durrant,J
DO  - 10.1021/jacs.7b05184
EP  - 11543
PY  - 2017///
SN  - 1520-5126
SP  - 11537
TI  - Kinetics of photoelectrochemical oxidation of methanol on hematite photoanodes
T2  - Journal of the American Chemical Society
UR  - http://dx.doi.org/10.1021/jacs.7b05184
UR  - https://pubs.acs.org/doi/10.1021/jacs.7b05184
UR  - http://hdl.handle.net/10044/1/50199
VL  - 139
ER  -
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