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

Youn Jeong Jang, Ji Wook Jang, Jaehyuk Lee, Ju Hun Kim, Hiromu Kumagai, Jinwoo Lee, Tsutomu Minegishi, Jun Kubota, Kazunari Domen, Jae Sung Lee

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3597-3604
Number of pages8
JournalEnergy and Environmental Science
Volume8
Issue number12
DOIs
Publication statusPublished - 2015 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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