Shape-tunable Pt-Ir alloy nanocatalysts with high performance in oxygen   electrode reactions

doi:10.1039/c6nr08359e

CORC > 北京大学 > 化学与分子工程学院

	Shape-tunable Pt-Ir alloy nanocatalysts with high performance in oxygen electrode reactions
	Zhang, Tao ; Li, Shuai-Chen ; Zhu, Wei ; Zhang, Zhi-Ping ; Gu, Jun ; Zhang, Ya-Wen
刊名	NANOSCALE
	2017
关键词	REGENERATIVE FUEL-CELL REDUCTION REACTION EVOLUTION REACTION WATER OXIDATION IRIDIUM OXIDE ELECTROCATALYTIC ACTIVITY MEMBRANE ELECTROLYZERS PLATINUM SURFACES FACILE SYNTHESIS ACIDIC MEDIA
DOI	10.1039/c6nr08359e
英文摘要	For the first time, shape-tunable Pt-Ir alloy nanocatalysts including both single-crystalline (nano-octahedra (NOs), nano-truncated octahedra (NTOs), nanocubes (NCs)) and polycrystalline (nanocluster flowers (NCFs), nanowires (NWs), nano-short-chains (NSCs), and nano-octahedral stars (NOSs)) ones were synthesized with a facile one-pot solvothermal method, via precise control of the facet-selective agents (Brand I-). The surface effects of Pt-Ir alloy nanocatalysts for oxygen electrode reaction in acidic solution were intensively investigated. Pt-Ir alloy nanocatalysts showed enhanced catalytic activities for the oxygen evolution reaction (OER), which were 1.6 to 2.0 times those of the commercial Ir/C catalyst and the Pt/C-Ir/C mixture at an overpotential of 0.25 V. The catalytic activity for the OER exhibited a positive correlation with the proportion of surface IrOx species, but was restricted by the surface alloying effect. Besides the change of the intermediate adsorption state, the dissociation of water was also confirmed to be effective as the rate-determining step of the Pt-Ir alloy nanocatalysts. The catalytic activity for the oxygen reduction reaction (ORR) decreased with the increase of surface IrOx species. Pt-Ir nano-short-chains (NSCs) exhibited 1.3 times the catalytic activity as that of the commercial Pt/C catalyst at 0.80 V and 0.85 V, owing to the higher proportion of the (110) facets with irregular step sites exposed after the annealing treatment at 350 degrees C. The unique structure could prevent the mass transfer process from being obstructed by adsorbed bisulfate anions and oxidized species on the surfaces. Pt-Ir NSCs exhibited a catalytic efficiency of 46.7% and were considered to be a promising URFC catalyst.; National Key Research and Development Program of China [2016YFB0701100]; Natural Science Foundation of China [21025101, 21271011, 21321001]; Beijing Natural Science Foundation [2162019]; SCI(E); ARTICLE; 3; 1154-1165; 9
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/476334]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Zhang, Tao,Li, Shuai-Chen,Zhu, Wei,et al. Shape-tunable Pt-Ir alloy nanocatalysts with high performance in oxygen electrode reactions[J]. NANOSCALE,2017.
APA	Zhang, Tao,Li, Shuai-Chen,Zhu, Wei,Zhang, Zhi-Ping,Gu, Jun,&Zhang, Ya-Wen.(2017).Shape-tunable Pt-Ir alloy nanocatalysts with high performance in oxygen electrode reactions.NANOSCALE.
MLA	Zhang, Tao,et al."Shape-tunable Pt-Ir alloy nanocatalysts with high performance in oxygen electrode reactions".NANOSCALE (2017).