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Tunable Syngas Production from CO 2 and H 2 O in an Aqueous Photoelectrochemical Cell
Author(s) -
Chu Sheng,
Fan Shizhao,
Wang Yongjie,
Rossouw David,
Wang Yichen,
Botton Gianluigi A.,
Mi Zetian
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201606424
Subject(s) - syngas , faraday efficiency , methanol , aqueous solution , chemistry , catalysis , chemical engineering , photoelectrochemical cell , inorganic chemistry , electrochemistry , organic chemistry , electrode , engineering , electrolyte
Abstract Syngas, the mixture of CO and H 2 , is a key feedstock to produce methanol and liquid fuels in industry, yet limited success has been made to develop clean syngas production using renewable solar energy. We demonstrated that syngas with a benchmark turnover number of 1330 and a desirable CO/H 2 ratio of 1:2 could be attained from photoelectrochemical CO 2 and H 2 O reduction in an aqueous medium by exploiting the synergistic co‐catalytic effect between Cu and ZnO. The CO/H 2 ratio in the syngas products was tuned in a large range between 2:1 and 1:4 with a total unity Faradaic efficiency. Moreover, a high Faradaic efficiency of 70 % for CO was acheived at underpotential of 180 mV, which is the lowest potential ever reported in an aqueous photoelectrochemical cell. It was found that the combination of Cu and ZnO offered complementary chemical properties that lead to special reaction channels not seen in Cu, or ZnO alone.