Novel hierarchical SnO2 microsphere catalyst coated on gas diffusion electrode for enhancing energy efficiency of CO2 reduction to formate fuel
Novel hierarchical SnO2 microsphere catalyst coated on gas diffusion electrode for enhancing energy efficiency of CO2 reduction to formate fuel
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DOI：
10.1016/j.apenergy.2016.03.115
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发表时间：
2016-08-01
期刊：
影响因子：
11.2
通讯作者：
Wilkinson, David P.
中科院分区：
文献类型：
--
作者：
Fu, Yishu;Li, Yanan;Wilkinson, David P.
利用可再生能源间歇产生的电能将二氧化碳转化为增值燃料，在能源使用协调方面非常有前途。该过程将温室气体二氧化碳转化为各种有吸引力的化学品和燃料，如甲醇，甲酸盐和其他碳氢化合物。本文采用新型分级氧化锡微球（HMS-SnO 2）沉积在气体扩散层电极（HMS-SnO 2/GDE）上，研究了水溶液中CO2电还原为甲酸盐的反应。该实验在分隔的H型两室池中进行，该H型两室池具有Nafion（R）膜作为分隔阴极室和阳极室的隔膜。HMS-SnO 2催化剂是通过一个简单的水热自组装过程中使用不同比例的乙醇和蒸馏水的合成溶液中合成的。由于SnO 2 -86/GDE对CO2电还原具有优异的催化活性和选择性，在-1.7 V vs. SHE（标准氢电极）下，其对甲酸盐的法拉第效率高达62%。电极的耐久性也观察到超过12小时的连续电解操作的稳定电流密度。这种上级性能归功于形态和尺寸受控的分级结构，其可以提供更多的活性位点以加速CO2还原的缓慢动力学，从而导致能量效率的提高。在电解过程中，KHCO 3电解液被发现有一定的贡献，甲酸盐的形成上的微结构的氧化锡催化剂涂层GDE电极。(C)2016爱思唯尔有限公司版权所有
The conversion of carbon dioxide to value-added fuel using electrical energy generated intermittently from renewable energy sources is very promising in terms of energy usage reconciliation. The process converts greenhouse carbon dioxide gas to produce diverse attractive chemicals and fuels like methanol, formate, and other hydrocarbons. In this paper, the electroreduction of CO2 to formate in aqueous solution is performed by using novel hierarchical tin oxide microsphere (HMS-SnO2) particles deposited over gas diffusion layer electrode (HMS-SnO2/GDE). The experiment is carried out in a divided H-type two compartment cell with a Nafion (R) membrane as the, diaphragm separating the cathodic and anodic compartments. The HMS-SnO2 catalysts are synthesized by a facile hydrothermal self-assembled process using different ratios of ethanol to distilled water in the synthetic solution. Due to the outstanding catalytic activity and selectivity toward CO2 electroreduction, SnO2-86/GDE exhibits a high Faradaic efficiency of 62% toward formate formation at -1.7 V vs. SHE (Standard Hydrogen Electrode). The electrode durability is also observed with a stable current density over 12 h of continuous electrolysis operation. The superior performance is credited to the morphology- and size-controlled hierarchical structure, which may provide more active sites to accelerate the slow kinetics of CO2 reduction, leading to the improved energy efficiency. During electrolysis process, KHCO3 electrolyte is found to have some contribution to formate formation on the micro-structured tin oxide catalysts coated GDE electrode. (C) 2016 Elsevier Ltd. All rights reserved.