Enhancing CO2 electrolysis to formate on facilely synthesized Bi catalysts at low overpotential
Enhancing CO2 electrolysis to formate on facilely synthesized Bi catalysts at low overpotential
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在低过电势下，在易于合成的 Bi 催化剂上增强 CO2 电解生成甲酸盐
DOI：
10.1016/j.apcatb.2017.06.032
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发表时间：
2017-12
期刊：
影响因子：
--
通讯作者：
Qiao Jinli
中科院分区：
文献类型：
--
作者：
Zhang Xia;Lei Tao;Liu Yuyu;Qiao Jinli
利用可再生电力将CO2电化学还原为燃料和化学品是缓解温室效应和能源危机的一条有前途的途径。然而，开发高活性、高选择性、高稳定性的催化剂仍然是实现这一目标的瓶颈。在这篇文章中，我们报道了一种微结构的Bi催化剂的良好性能，该催化剂在室温和环境压力下直接将CO2转化为燃料。Bi催化剂通过简单且容易的水溶液化学还原策略来设计，其易于放大。Bi 45催化剂对CO2转化为甲酸盐具有上级催化活性，在施加电位−1.45 V vs. SCE下实现了90%的高法拉第效率。Bi 45/GDE电极的过电位仅为600 mV，刷新了文献报道的所有Bi催化剂的记录。特别地，该催化剂被证明是耐用的，在-1.45 V vs. SCE下连续电解20小时后没有任何明显的降解。这里实现的显著活性归因于Bi催化剂的特殊微结构，其可以提供更多的活性位点，如通过与商业Bi的结构比较所指示的。
The electrochemical reduction of CO2to fuels and chemicals powered by renewable electricity has been regarded as a promising pathway, which can mitigate the greenhouse effect and energy crisis. However, the development of catalyst with high activity, selectivity, and good stability is still the bottleneck to accomplish this goal. In this communication, we report the promising performance of a micro-structured Bi catalyst which directly converts CO2to fuels at room temperature and ambient pressure. The Bi catalyst is designed by a simple and facile aqueous chemical reduction strategy, which readily scales up. The Bi45catalyst exhibits a superior catalytic activity for CO2conversion to formate, achieving a high Faradic efficiency of 90% at applied potential −1.45 V vs. SCE. The overpotential for the Bi45/GDE electrode is only 600 mV, a new record to all reported Bi catalysts in the literature. Particularly, the catalyst proves to be robust without any obvious degradation over 20 h of continuous electrolysis at −1.45 V vs. SCE. The notable activity achieved here is ascribed to the special micro-structure of the Bi catalyst, which may afford more active sites, as indicated by comparison to the structure of commercial Bi.
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