Chen Guoliang, Ge Lei, Kuang Yizhu, Rabiee Hesamoddin, Ma Beibei, Dorosti Fatereh, Nanjundan Ashok Kumar, Zhu Zhonghua, Wang Hao
Centre for Future Materials University of Southern Queensland Springfield QLD 4300 Australia.
School of Engineering University of Southern Queensland Springfield QLD 4300 Australia.
Small Sci. 2024 Jul 10;4(10):2400184. doi: 10.1002/smsc.202400184. eCollection 2024 Oct.
Electrochemical reduction of CO (CORR) is an effective strategy to mitigate carbon emission effects and store renewable electricity in value-added feedstocks, but it still suffers low production rate and current density. A nanostructured catalyst offers opportunities to enhance CORR activity by contributing numerous active sites and promoting charge transfer. Herein, a Cu hollow fiber gas diffusion electrode (HFGDE) with silver sub-nanosheets on a zinc nanosheet structure to produce CO is reported. Compared to the HFGDE only possessed zinc nanosheet structure, the as-prepared HFGDE with hierarchical sub-nano AgZn bimetal nanosheets exhibits a twice-partial current density of CO and a CO production rate at the applied potential -1.3 V (versus reversible hydrogen electrode). The unique Ag sub-nanosheets interconnected Zn nanosheets provide multiple charge transfer channels, and the synergistic effect between Ag and Zn improves the adsorption binding energy of COOH* intermediate, resulting in a lower charge transfer resistance and fast CORR kinetics to produce CO. This research demonstrates the high potential of nanoengineering electrocatalysts for HFGDE to achieve highly efficient CO reduction.
电化学还原CO（CORR）是减轻碳排放影响并将可再生电力存储在增值原料中的有效策略，但它仍然存在生产率和电流密度较低的问题。纳米结构催化剂通过提供大量活性位点和促进电荷转移，为提高CORR活性提供了机会。在此，报道了一种具有锌纳米片结构上的银亚纳米片以生产CO的铜中空纤维气体扩散电极（HFGDE）。与仅具有锌纳米片结构的HFGDE相比，所制备的具有分级亚纳米AgZn双金属纳米片的HFGDE在施加电位-1.3 V（相对于可逆氢电极）时表现出两倍的CO分电流密度和CO产率。独特的Ag亚纳米片与Zn纳米片相互连接提供了多个电荷转移通道，并且Ag和Zn之间的协同效应提高了COOH*中间体的吸附结合能，从而降低了电荷转移电阻并加快了产生CO的CORR动力学。这项研究证明了纳米工程电催化剂用于HFGDE以实现高效CO还原的巨大潜力。
