Electrochemical modification and structural characterization of porous PtNi/C catalyst
Electrochemical modification and structural characterization of porous PtNi/C catalyst
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多孔PtNi/C催化剂的电化学修饰及结构表征
DOI：
10.1016/j.jallcom.2021.160454
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发表时间：
2021-05-26
影响因子：
6.2
通讯作者：
Li, Yan
中科院分区：
文献类型：
--
作者：
Fang, Liudang;Yang, Bin;Li, Yan
高效析氢反应催化剂的开发对未来的可持续能源转换具有重要意义。本文采用离子束溅射和超声辅助电化学腐蚀去合金化的方法制备了多孔炭负载PtNi合金催化剂，并对其催化性能进行了评价。采用多种分析方法，结合正交实验，分析了腐蚀脱合金化对PtNi合金析氢活性以及稳定性、相结构、表面成分和活性中心的影响。结果表明，在40℃，0.2mol/L的硫酸溶液中腐蚀0.5h后，HER的催化活性提高了51.39%，铂负载量降低25.83%，析氢性能变差，腐蚀温度对HER的催化活性有显著影响。催化剂表面的孔结构增加了裸露的铂元素的相对含量，Ni原子缺失产生的零维缺陷导致了催化剂表面反应区和活性中心的促进。合金的晶面间距(NIPT)低于标准值的3%-6%，而铂的晶格压缩应变是导致PtNi合金催化剂催化性能提高的原因。Pt4f7/2的结合能降低了0.74 eV，增加了电化学活性中心，促进了氢的释放。(C)2021年爱思唯尔B.V.保留所有权利。
The development of catalysts for high-efficient hydrogen evolution reaction (HER) is important for future sustainable energy conversion. Herein, porous carbon-supported PtNi alloy catalysts were fabricated by ion beam sputtering and ultrasonic-assisted electrochemical corrosion dealloying methods, and their performances toward the catalysis of HER were evaluated. The effects of corrosion dealloying on the hydrogen evolution activity, as well as stability, phase structure, surface composition, and active sites of PtNi alloys were analyzed by various analytical methods combined with orthogonal experiments. The results showed increased catalytic activity of HER by 51.39% after corrosion of the material in 0.2 mol/L H2SO4 at 40 degrees C for 0.5 h. The hydrogen evolution deteriorated as Pt-loading decreased by 25.83%, and corrosion temperature displayed significant influence. The pore structure of the catalyst surface raised the relative content of the exposed Pt element, and the zero-dimensional defect generated by the Ni atom deletion led to promotion in reaction area and active sites on the catalyst surface. The interplanar spacing of alloys (NiPt) was below 3%-6% of the standard value, and the lattice compressive strain of Pt was the reason that led to improved catalytic performance of PtNi alloy catalysts. The binding energy of the Pt 4f7/2 decreased by 0.74 eV, leading to enhanced electrochemical active sites and promoted hydrogen release. (c) 2021 Elsevier B.V. All rights reserved.