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Issue 12, 2015
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Selective CO production by Au coupled ZnTe/ZnO in the photoelectrochemical CO2 reduction system

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Abstract

A gold-coupled ZnTe/ZnO-nanowire array is a new photocathode for selective CO2 reduction to CO. At −0.7 VRHE under simulated 1 sun illumination, its photocurrent (−16.0 mA cm−2) and incident photon-to-current conversion efficiency (97%) represent the highest among reported ZnTe photocathodes for CO2 reduction and dramatic enhancement from those of a bare electrode (−7.9 mA cm−2, 68%). In addition, the Au nanoparticles convert mainly-hydrogen-producing bare ZnTe/ZnO-nanowires into mainly-CO-producing photocathodes in photoelectrochemical CO2 reduction. The remarkable effects of the Au co-catalyst originate from the formation of a Schottky junction with ZnTe to improve charge separation and to provide reaction centers for CO2 reduction suppressing competing water reduction.

Graphical abstract: Selective CO production by Au coupled ZnTe/ZnO in the photoelectrochemical CO2 reduction system

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Article information


Submitted
10 May 2015
Accepted
17 Sep 2015
First published
18 Sep 2015

Energy Environ. Sci., 2015,8, 3597-3604
Article type
Paper
Author version available

Selective CO production by Au coupled ZnTe/ZnO in the photoelectrochemical CO2 reduction system

Y. J. Jang, J. Jang, J. Lee, J. H. Kim, H. Kumagai, J. Lee, T. Minegishi, J. Kubota, K. Domen and J. S. Lee, Energy Environ. Sci., 2015, 8, 3597
DOI: 10.1039/C5EE01445J

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