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高熔点金属掺杂对PtCuNi三元合金纳米晶电催化性能影响研究

发表时间:2017-01-17  浏览量:1525  下载量:328
全部作者: 陈锴,涂文哲,李煜璟
作者单位: 中国石油大学(北京)理学院;北京理工大学材料科学与工程学院
摘 要: 基于PtCuNi三元合金纳米催化剂体系,首先通过酸处理获得洁净的表面,进而在纳米晶表面掺杂高熔点金属元素W,从而达到提升三元合金催化剂催化氧还原反应(oxygen reduction reaction,ORR)活性和稳定性的目的。通过将该纳米晶负载于高比表面积的炭黑,得到W掺杂的PtCuNi/C催化剂(PtCuNi-W/C)。ORR电催化测试结果表明,PtCuNi-W/C催化剂表现出优异的电催化性能,电化学活性面积(electrochemical surface area,ECSA)达到商业化Pt/C催化剂的2.1倍,质量比活度(mass activity,MA)和面积比活度(specific activity,SA)分别达到2.42 A/mgPt和2.22 mA/cm2,为商业化Pt/C(0.16 A/mgPt和0.24 mA/cm2)的15.1倍和9.3倍,并且在经过20 000圈循环伏安极化后仍能保持较高的电催化活性,显示了高ORR电催化活性和稳定性。研究通过在Pt基合金表面掺杂高熔点金属W提升了其ORR催化活性和稳定性,为燃料电池阴极催化剂的设计提供了新的思路。
关 键 词: 电化学;合金纳米晶;表面掺杂;铂铜镍合金;氧还原反应;燃料电池
Title: Electrocatalytic performance of PtCuNi ternary alloy nanocrystals doped with high-melting-point metal
Author: CHEN Kai, TU Wenzhe, LI Yujing
Organization: College of Science, China University of Petroleum (Beijing); School of Materials Science and Engineering, Beijing Institute of Technology
Abstract: This paper focused mainly on PtCuNi alloy nanocrystals which are synthesized with monodispersity in size through facile solvothermal approach, utilizes an acidic treatment protocol to remove organic capping agents and obtain clean surface, and then carries out a surface doping of W atoms, in order to drastically achieve the enhancement of activity and durability towards oxygen reduction reaction (ORR). By loading the PtCuNi nanocrystals on high surface area carbon black, PtCuNi-W/C can be obtained as practically usable electrocatalysts. The ORR electrochemical measurements reveal that as-synthesized PtCuNi-W/C shows obviously enhanced ORR performance, with a 2.1-time electrochemical surface area (ECSA) compared with commercial Pt/C catalyst. They display a mass activity (MA) of 2.42 A/mgPt and specific activity (SA) of 2.22 mA/cm2, which means 15.1- and 9.3-fold enhancements, respectively, compared with the commercial Pt/C (0.16 A/mgPt of MA and 0.24 mA/cm2 of SA). Further accelerated durability test, by exerting 20 000 cycles of potential scanning, reveals the high stability of the PtCuNi-W/C catalyst. This work demonstrates that by surface-doping of W atoms, the activity and stability of the Pt-alloy catalysts can be greatly enhanced, which provides a new thought for designing high performance ORR catalysts of fuel cell.
Key words: electrochemistry; alloy nanocrystal; surface doping; PtCuNi alloy; oxygen reduction reaction; fuel cell
发表期数: 2017年1月第1期
引用格式: 陈锴,涂文哲,李煜璟. 高熔点金属掺杂对PtCuNi三元合金纳米晶电催化性能影响研究[J]. 中国科技论文在线精品论文,2017,10(1):89-97.
 
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