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A general and scalable approach to produce nanoporous alloy nanowires with rugged ligaments for enhanced electrocatalysis
Qiu, H. -J.; Gao, J. J.; Chiang, F. -K.; Wen, Y. R.; Yao, A. Y.; Du, P.; Fang, G.; Wang, J. Q.; Liu, X. J.
2018
发表期刊JOURNAL OF MATERIALS CHEMISTRY A
卷号6期号:26页码:12541-12550
摘要Nanoporous metal nanowires with large surface areas, and a high density of defect sites play an important role in catalysis. Here, a general and scalable one-step dealloying strategy is developed to prepare nanoporous alloy nanowires with controllable compositions by manipulating the grain size, structure and composition of bulk Cu-based precursor alloys. We prepared PtCuAu nanoporous nanowires with a diameter of 200-500 nm and tunable composition by dealloying a diluted Pt1Au0.5Cu98.5 single-phase alloy with nanoscale column-like-structured grains. Material characterization suggests that the formation of separated nanowires is due to the large-scale shrinkage of the column-structured grains during dealloying of Cu, which also generates ultrafine nanopores and rugged alloy ligaments with a high density of defect sites in the nanowires. When used as a cathodic catalyst for the oxygen reduction reaction (ORR), the PtCuAu nanoporous nanowires exhibit a composition-dependent catalytic performance. The 8.0 M HNO3 dealloyed sample exhibits a specific activity of 4.12 mA cm(-2) at 0.9 V, which is more than 14 times that of commercial Pt/C. With the advantages of being easy to scale up, highly reproducible and controllable, the fabrication strategy holds great promise to prepare nanocatalysts for fuel cells.
关键词Oxygen Reduction Reaction High Catalytic-activity One-pot Synthesis Methanol Oxidation Fuel-cells Pt-skin Platinum Nanoparticles Performance Gold
学科领域Materials Science ; Physics
语种英语
文献类型期刊论文
条目标识符http://ir.nimte.ac.cn/handle/174433/17318
专题2018专题
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GB/T 7714
Qiu, H. -J.,Gao, J. J.,Chiang, F. -K.,et al. A general and scalable approach to produce nanoporous alloy nanowires with rugged ligaments for enhanced electrocatalysis[J]. JOURNAL OF MATERIALS CHEMISTRY A,2018,6(26):12541-12550.
APA Qiu, H. -J..,Gao, J. J..,Chiang, F. -K..,Wen, Y. R..,Yao, A. Y..,...&Liu, X. J..(2018).A general and scalable approach to produce nanoporous alloy nanowires with rugged ligaments for enhanced electrocatalysis.JOURNAL OF MATERIALS CHEMISTRY A,6(26),12541-12550.
MLA Qiu, H. -J.,et al."A general and scalable approach to produce nanoporous alloy nanowires with rugged ligaments for enhanced electrocatalysis".JOURNAL OF MATERIALS CHEMISTRY A 6.26(2018):12541-12550.
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