Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
Chemistry. 2018 Oct 17;24(58):15486-15490. doi: 10.1002/chem.201803015. Epub 2018 Sep 19.
Electrochemical carbon dioxide reduction is a key reaction for carbon dioxide conversion to valuable fuels and chemicals. Due to the intrinsic stability of the carbon dioxide molecule, a catalyst is required to minimize the energy input and improve the reaction rates. Although the developed catalysts still suffer from low catalytic activity, selectivity, and stability, these could be enhanced by the involvement of sharp tip structure. Here, we report a nanowire-like zinc electrocatalyst with sharp tips for carbon dioxide reduction. The catalyst achieves a geometry current density of -40 mA cm at a potential of -0.95 V versus reversible hydrogen electrode over 35 hours with a stable carbon monoxide Faradaic efficiency of 98±2 %. The carbon monoxide partial current density surpasses by 60 % of that of the best reported zinc catalyst.
电化学二氧化碳还原是将二氧化碳转化为有价值的燃料和化学品的关键反应。由于二氧化碳分子的内在稳定性，需要催化剂来最小化能量输入并提高反应速率。尽管开发的催化剂仍然存在催化活性、选择性和稳定性低的问题，但通过引入锐钛矿结构可以提高其性能。在这里，我们报告了一种具有锐钛矿结构的纳米线状锌电催化剂，用于二氧化碳还原。该催化剂在 35 小时内，在相对于可逆氢电极的-0.95 V 电位下，实现了-40 mA cm 的几何电流密度，并且一氧化碳法拉第效率稳定在 98±2%。一氧化碳部分电流密度超过了已报道的最好的锌催化剂的 60%。
