含氮石墨二炔上的铜单原子电催化剂用于将 CO2 电还原为 CH4

IF 15.7 1区 化学 Q1 CHEMISTRY, APPLIED Chinese Journal of Catalysis Pub Date : 2024-09-01 DOI:10.1016/S1872-2067(24)60106-3
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引用次数: 0

摘要

开发具有明确活性位点的铜单原子催化剂(SAC),对于在电化学二氧化碳还原反应中生成 CH4 以及了解其结构-性能关系非常有帮助。本文合成了一种新的石墨二炔类似物,它具有均匀分布的 N2-二价(注意 N2-二价位点 = N^N-二价位点;在本文中 N2≠二氮气)位点。由于 Cu 与 N2 键合位点之间的相互作用很强,因此得到了一种具有孤立的欠配位 Cu-N2 位点的 Cu SAC(Cu1.0/N2-GDY),Cu 的负载量为 1.0 wt%。Cu1.0/N2-GDY 在 -0.96 V 对 RHE 的电压条件下,对 CH4 的电催化还原 CO2 的法拉第效率(FE)最高,达到 80.6%,CH4 的部分电流密度为 160 mA cm-2。当总电流密度为 100 至 300 mA cm-2 时,对 CH4 的选择性保持在 70% 以上。更显著的是,在 -1.18 V 对 RHE 条件下,Cu1.0/N2-GDY 对 CH4 的质量活度达到 53.2 A/mgCu。原位电化学光谱研究表明,欠配位的 Cu-N2 位点比对应的 Cu 纳米粒子更有利于生成关键的 *COOH 和 *CHO 中间体。这项工作为生产具有欠配位金属-N2 位点的 SACs 提供了有效途径,从而实现高效电催化。
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Cu single-atom electrocatalyst on nitrogen-containing graphdiyne for CO2 electroreduction to CH4

Developing Cu single-atom catalysts (SACs) with well-defined active sites is highly desirable for producing CH4 in the electrochemical CO2 reduction reaction and understanding the structure-property relationship. Herein, a new graphdiyne analogue with uniformly distributed N2-bidentate (note that N2-bidentate site = N^N-bidentate site; N2 ≠ dinitrogen gas in this work) sites are synthesized. Due to the strong interaction between Cu and the N2-bidentate site, a Cu SAC with isolated undercoordinated Cu-N2 sites (Cu1.0/N2-GDY) is obtained, with the Cu loading of 1.0 wt%. Cu1.0/N2-GDY exhibits the highest Faradaic efficiency (FE) of 80.6% for CH4 in electrocatalytic reduction of CO2 at −0.96 V vs. RHE, and the partial current density of CH4 is 160 mA cm−2. The selectivity for CH4 is maintained above 70% when the total current density is 100 to 300 mA cm−2. More remarkably, the Cu1.0/N2-GDY achieves a mass activity of 53.2 A/mgCu toward CH4 under −1.18 V vs. RHE. In situ electrochemical spectroscopic studies reveal that undercoordinated Cu-N2 sites are more favorable in generating key *COOH and *CHO intermediate than Cu nanoparticle counterparts. This work provides an effective pathway to produce SACs with undercoordinated Metal-N2 sites toward efficient electrocatalysis.

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来源期刊
Chinese Journal of Catalysis
Chinese Journal of Catalysis 工程技术-工程:化工
CiteScore
25.80
自引率
10.30%
发文量
235
审稿时长
1.2 months
期刊介绍: The journal covers a broad scope, encompassing new trends in catalysis for applications in energy production, environmental protection, and the preparation of materials, petroleum chemicals, and fine chemicals. It explores the scientific foundation for preparing and activating catalysts of commercial interest, emphasizing representative models.The focus includes spectroscopic methods for structural characterization, especially in situ techniques, as well as new theoretical methods with practical impact in catalysis and catalytic reactions.The journal delves into the relationship between homogeneous and heterogeneous catalysis and includes theoretical studies on the structure and reactivity of catalysts.Additionally, contributions on photocatalysis, biocatalysis, surface science, and catalysis-related chemical kinetics are welcomed.
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