Integrated Pt2Ni alloy@Pt core-shell nanoarchitectures with high electrocatalytic activity for oxygen reduction reaction

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題名:	Integrated Pt2Ni alloy@Pt core-shell nanoarchitectures with high electrocatalytic activity for oxygen reduction reaction
作者:	劉炯權;Zhang, Yuan;Han, Tingting;Fang, Jianhui;Xu, Pengcheng;Li, Xinxin;Xu, Jiaqiang;Liu, Chung-Chiun
貢獻者:	工學院材料科學與工程研究所
關鍵詞:	active sites;adsorption;alloys;catalysts;catalytic activity;corrosion;durability;electrochemistry;nanocrystals;nanoparticles;nickel;permeability;platinum;surface area;synergism
日期:	2014-08-07
上傳時間:	2026-04-23 11:37:17 (UTC+8)
出版者:	Royal Society of Chemistry
摘要:	摘要： This work reports the synthesis, electrocatalytic performance and structure-dependent catalytic activity of Pt₂Ni alloyPt core–shell nanoarchitectures (denoted as Pt₂Ni alloyPt). The core–shell nanoarchitecture of Pt₂Ni alloyPt catalyst is confirmed as consisting of a single concave-tetrahedral alloy nanocrystal core decorated with nanodendritic Pt particles. The oxygen reduction reaction (ORR) activity measurement indicates that the Pt₂Ni alloyPt nanoarchitecture can enhance the ORR activity, accelerate the catalytic reaction and improve the durability of the catalyst during the electrocatalytic process. The atomic ratio between Pt and Ni is tuned to obtain various PtₓNi₁₋ₓ bimetallic nanostructures, and used for elucidation of structure dependence of catalytic activity. The resultant different PtₓNi₁₋ₓ catalysts exhibit considerable structure-dependent catalytic activity. The measurement results indicate that the order of ORR activity is as follows: cubic alloy nanocrystals (PtNi₂) < cubic alloy crystalPt particles (PtNi₂Pt) < concave-tetrahedral alloy nanocrystals (Pt₂Ni) < Pt₂Ni alloyPt. Accordingly, the considerable ORR activity of Pt₂Ni alloyPt catalyst is achieved by introducing an optimal amount of Ni atoms into PtₓNi₁₋ₓ catalyst and formulating the bimetallic crystal into a core–shell nanoarchitecture. In this integrated core–shell nanoarchitecture, the extended Pt nanoparticles shell provides high surface area, rich adsorption sites, and favorable surface permeability. Furthermore, the concave-tetrahedral alloy crystal core suppresses the activity loss derived from the agglomeration and/or corrosion of Pt active sites. Therefore, the two different components (alloy crystal core and extended Pt particles shell) contribute to different functions and further generate a synergistic effect towards ORR activity. 出版日期： 2014-01-01 出處： Journal of materials chemistry. A, Materials for energy and sustainability, 2014-01, Vol.2 (29 p.11400-11407), p.11400-11407 資源來源： Royal Society of Chemistry 識別號： ISSN: 2050-7496 識別號： DOI: 10.1039/c4ta00731j
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