Production of methanol from CO2 electroreduction at Cu2O and Cu2O/ZnO-based electrodes in aqueous solution

被引:274
作者
Albo, Jonathan [1 ]
Saez, Alfonso [2 ]
Solla-Gullon, Jose [2 ]
Montiel, Vicente [2 ]
Irabien, Angel [3 ]
机构
[1] Univ Basque Country, Dept Chem Engn, Bilbao 48080, Spain
[2] Univ Alicante, Inst Electrochem, E-03080 Alicante, Spain
[3] Univ Cantabria, Dept Chem & Biomol Engn, E-39005 Santander, Spain
关键词
CO2; valorisation; Electrochemical reduction; Methanol; Cu2O/ZnO-based electrodes; Stability; ELECTROCHEMICAL REDUCTION; CARBON-DIOXIDE; ZINC-OXIDE; COPPER; CONVERSION; CATALYSTS; CHALLENGES; LIQUID;
D O I
10.1016/j.apcatb.2015.04.055
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, we examine the performance of Cu2O and Cu2O/ZnO surfaces in a filter-press electro-chemical cell for the continuous electroreduction of CO2 into methanol. The electrodes are prepared by airbrushing the metal particles onto a porous carbon paper and then are electrochemically characterized by cyclic voltammetry analyses. Particular emphasis is placed on evaluating and comparing the methanol production and Faradaic efficiencies at different loadings of Cu2O particles (0.5, 1 and 1.8 mg cm(-2)), Cu2O/ZnO weight ratios (1:0.5, 1:1 and 1:2) and electrolyte flow rates (1, 2 and 3 ml min(-1) cm(-2)). The electrodes including ZnO in their catalytic surface were stable after 5 h, in contrast with Cu2O-deposited carbon papers that present strong deactivation with time. The maximum methanol formation rate and Faradaic efficiency for Cu2O/ZnO (1:1)-based electrodes, at an applied potential of -1.3Vvs. Ag/AgCI, were r=3.17 x 10(-5) mol m(-2) s(-1) and FE = 17.7%, respectively. Consequently, the use of Cu2O-ZnO mixtures may be of application for the continuous electrochemical formation of methanol, although further research is still required in order to develop highly active, selective and stable catalysts the electroreduction of CO2 to methanol. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:709 / 717
页数:9
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