Handoko Albertus D, Chen Hetian, Lum Yanwei, Zhang Qianfan, Anasori Babak, Seh Zhi Wei
Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A∗STAR), 2 Fusionopolis Way, Innovis, Singapore 138634, Singapore.
School of Materials Science and Engineering, Beihang University, Beijing, 100191, P. R. China.
iScience. 2020 Jun 26;23(6):101181. doi: 10.1016/j.isci.2020.101181. Epub 2020 May 18.
Electrocatalytic CO reduction reaction (CORR) is an attractive way to produce renewable fuel and chemical feedstock, especially when coupled with efficient CO capture and clean energy sources. On the fundamental side, research on improving CORR activity still revolves around late transition metal-based catalysts, which are limited by unfavorable scaling relations despite intense investigation. Here, we report a combined experimental and theoretical investigation into electrocatalytic CORR on Ti- and Mo-based MXene catalysts. Formic acid is found as the main product on TiCT and MoCT MXenes, with peak Faradaic efficiency of over 56% on TiCT and partial current density of up to -2.5 mA cm on MoCT. Furthermore, simulations reveal the critical role of the T group: a smaller overpotential is found to occur at lower amounts of -F termination. This work represents an important step toward experimental demonstration of MXenes for more complex electrocatalytic reactions in the future.
电催化CO还原反应（CORR）是生产可再生燃料和化学原料的一种有吸引力的方法，特别是当与高效的CO捕获和清洁能源相结合时。在基础研究方面，提高CORR活性的研究仍围绕基于晚期过渡金属的催化剂展开，尽管进行了深入研究，但这些催化剂受到不利的比例关系的限制。在此，我们报告了对基于Ti和Mo的MXene催化剂上的电催化CORR进行的实验和理论相结合的研究。发现甲酸是TiCT和MoCT MXene上的主要产物，在TiCT上的峰值法拉第效率超过56%，在MoCT上的部分电流密度高达-2.5 mA cm。此外，模拟揭示了T基团的关键作用：发现-F端基数量较少时过电位较小。这项工作代表了朝着未来在更复杂的电催化反应中对MXene进行实验验证迈出的重要一步。
