A hierarchically structured tin-cobalt composite with an enhanced electronic effect for high-performance CO2 electroreduction in a wide potential range

法拉第效率 催化作用 双金属片 复合数 材料科学 电化学 氧化物 氧化锡 电子转移 格式化 选择性 碳纳米管 吸附 化学工程 纳米技术 化学 无机化学 电极 冶金 复合材料 光化学 物理化学 有机化学 工程类
作者
Xingxing Jiang,Xuan Li,Yan Kong,Chen Deng,Xiaojie Li,Qi Hu,Hengpan Yang,Chuanxin He
出处
期刊:Journal of Energy Chemistry [Elsevier BV]
卷期号:76: 462-469 被引量:26
标识
DOI:10.1016/j.jechem.2022.10.008
摘要

Hollow nanotubes covered by dense nanorods of SnCo-HNT were developed with strong electronic effects and exhibited excellent performance for CO 2 electroreduction toward C1 products with >90% Faradaic efficiencies over a wide potential range. Earth-abundant and nontoxic Sn-based materials have been regarded as promising catalysts for the electrochemical conversion of CO 2 to C1 products, e.g., CO and formate. However, it is still difficult for Sn-based materials to obtain satisfactory performance at low-to-moderate overpotentials. Herein, a simple and facile electrospinning technique is utilized to prepare a composite of a bimetallic Sn-Co oxide/carbon matrix with a hollow nanotube structure (SnCo-HNT). SnCo-HNT can maintain >90% faradaic efficiencies for C1 products within a wide potential range from −0.6 V RHE to −1.2 V RHE , and a highest 94.1% selectivity towards CO in an H-type cell. Moreover, a 91.2% faradaic efficiency with a 241.3 mA cm −2 partial current density for C1 products could be achieved using a flow cell. According to theoretical calculations, the fusing of Sn/Co oxides on the carbon matrix accelerates electron transfer at the atomic level, causing electron deficiency of Sn centers and reversible variation between Co 2+ and Co 3+ centers. The synergistic effect of the Sn/Co composition improves the electron affinity of the catalyst surface, which is conducive to the adsorption and stabilization of key intermediates and eventually increases the catalytic activity in CO 2 electroreduction. This study could provide a new strategy for the construction of oxide-derived catalysts for CO 2 electroreduction.
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