College of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou Province, 550025, China.
Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
Nat Commun. 2018 Sep 12;9(1):3702. doi: 10.1038/s41467-018-06043-1.
Recently, the development of high-performance non-platinum electrocatalysts for fuel cell applications has been gaining attention. Palladium-based nanoalloys are considered as promising candidates to substitute platinum catalysts for cathodic and anodic reactions in fuel cells. Here, we develop a facile route to synthesize dendritic palladium-copper-cobalt trimetallic nanoalloys as robust multifunctional electrocatalysts for oxygen reduction and formic acid oxidation. To the best of our knowledge, the mass activities of the dendritic PdCuCo nanoalloy toward oxygen reduction and formic acid oxidation are higher than those previously reported for non-platinum metal nanocatalysts. The PdCuCo nanoalloys also exhibit superior durability for oxygen reduction and formic acid oxidation as well as good antimethanol/ethanol interference ability compared to a commercial platinum/carbon catalyst. The high performance of the dendritic PdCuCo nanoalloys is attributed to a combination of effects, including defects, a synergistic effect, change of d-band center of palladium, and surface strain.
近年来，针对燃料电池应用的高性能非铂电催化剂的发展受到了广泛关注。钯基纳米合金被认为是替代燃料电池中阴极和阳极反应的铂催化剂的有前途的候选者。在这里，我们开发了一种简便的方法来合成树枝状钯-铜-钴三元纳米合金，作为用于氧还原和甲酸氧化的稳健多功能电催化剂。据我们所知，树枝状 PdCuCo 纳米合金的质量活性对氧还原和甲酸氧化的活性均高于以前报道的非铂金属纳米催化剂。与商业铂/碳催化剂相比，PdCuCo 纳米合金还表现出对氧还原和甲酸氧化的优异耐久性以及对甲醇/乙醇干扰的良好抗干扰能力。树枝状 PdCuCo 纳米合金的高性能归因于多种因素的综合影响，包括缺陷、协同效应、钯的 d 带中心的变化和表面应变。
