Deciphering the active site in Ni–Cu bimetallic atomic clusters for selective CO2-to-CO electrocatalysis
Deciphering the active site in Ni–Cu bimetallic atomic clusters for selective CO2-to-CO electrocatalysis
研究概述
在氮掺杂碳上锚定约0.35 nm的NiCu异核原子团簇，利用球差电镜及XAS确认结构。计算表明Cu为主要CO2还原活性中心，其电子结构削弱关键中间体*CO结合，降低限速步骤能垒，促进CO2电还原制CO；摘要未给出具体性能数值。
谱图与表征信息
Fig. 2. Normalized XANES spectra at (a) Cu K-edge and (d) Ni K-edge, comparing NiCu-HACs/NC with 4NiCu-HACs/NC, single-metal ACs/NC controls, and reference materials. The corresponding magnitude of FT-EXAFS functions are presented in (b) for Cu and (e) for Ni. Detailed coordination parameters were derived from EXAFS fitting in R-space for the (c) Cu and (f) Ni edges of NiCu-HACs/NC. (g) Continuous wavelet transforms plots of the k2-weighted EXAFS data, resolving the atomic neighbors for Cu and Ni sites.