Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan, 430073, P. R. China.
Chemistry. 2023 May 8;29(26):e202203968. doi: 10.1002/chem.202203968. Epub 2023 Mar 22.
Three-dimensional (3D) nanoporous CuAg (NPCuAg) alloy catalysts with various Cu/Ag ratios are prepared by electrochemical dealloying of metallic glassy (MG) precursors. All dealloyed samples exhibit homogenous nanoporous structure and element composition distribution. After systematically evaluating their electrocatalytic performance toward MOR, it was found that the catalytic activity of the NPCuAg catalysts is enhanced along with the increase of Cu/Ag ratio, which may be attributed to the more exposed active reaction sites derived from high surface area of nanoporous structure and the optimal synergistic effect. Thus, the NPCu Ag alloy catalyst presents the best methanol electro-oxidation properties, including a high current density of 397.2 mA cm and good operation stability that retaining 84.5 % catalytic activity even after 7200 s. These results outperform most reported copper-based MOR catalysts in alkaline methanol solution. Considering these advantages, the designed electrodes are expected to be promising catalysts for alkaline DMFCs applications.
通过电化学脱合金化制备了具有不同 Cu/Ag 比的三维（3D）纳米多孔 CuAg（NPCuAg）合金催化剂。所有脱合金样品均表现出均匀的纳米多孔结构和元素组成分布。在系统评估它们对 MOR 的电催化性能后，发现 NPCuAg 催化剂的催化活性随着 Cu/Ag 比的增加而增强，这可能归因于高比表面积纳米多孔结构带来的更多暴露的活性反应位点和最佳协同效应。因此，NPCuAg 合金催化剂表现出最佳的甲醇电氧化性能，包括 397.2 mA cm 的高电流密度和良好的操作稳定性，即使在 7200 s 后仍保留 84.5%的催化活性。这些结果在碱性甲醇溶液中优于大多数报道的铜基 MOR 催化剂。考虑到这些优势，设计的电极有望成为碱性 DMFC 应用的有前途的催化剂。
