Wu Dengfeng, Zhang Wei, Lin Aijun, Cheng Daojian
State Key Laboratory of Organic-Inorganic Composites & Beijing Key Laboratory of Energy Environmental Catalysis & Beijing Advanced Innovation Center for Soft Matter Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , China.
Department of Environmental Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , China.
ACS Appl Mater Interfaces. 2020 Feb 26;12(8):9600-9608. doi: 10.1021/acsami.9b20076. Epub 2020 Feb 14.
Developing highly active and durable electrocatalysts with low levels of Pt content toward some crucial reactions including oxygen reduction reaction, hydrogen evolution reaction, and methanol oxidation reaction in an acidic electrolyte environment are desirable but still an open challenge for clean and efficient energy conversion. Herein, we present a facile route to synthesize low Pt-content ternary PtNiCu nanostructures with hollow interior and accessible surfaces (H-PtNiCu-AAT NPs) as enhanced multifunctional electrocatalysts. The galvanic replacement reaction and atomic diffusion between in situ preformed CuNi nanocrystals and Pt species should be responsible for the formation of hollow PtNiCu NPs. Continuous activation by acid picking and annealing treatments were performed to leach out the excessive Cu and Ni on the surfaces and to enrich Pt-content on the surface. H-PtNiCu-AAT NPs exhibit excellent activity and durability toward HER, ORR, and MOR due to the rational integration of multiple structural advantages. Strikingly, the mass activity and specific activity of H-PtNiCu-AAT NPs (0.977 A mg and 1.458 mA cm) is 7.1 and 6.9 times higher than that of commercial Pt/C (0.138 A mg and 0.212 mA cm) toward ORR at 0.9 V (vs RHE), respectively. This present work provides an efficient strategy for the design of low Pt-content trimetallic electrocatalysts with excellent activity and durability.
在酸性电解质环境中，开发对包括氧还原反应、析氢反应和甲醇氧化反应在内的一些关键反应具有高活性和耐久性且铂含量低的电催化剂是理想的，但对于清洁高效的能量转换而言，仍然是一个悬而未决的挑战。在此，我们提出了一种简便的路线来合成具有中空内部和可及表面的低铂含量三元铂镍铜纳米结构（H-PtNiCu-AAT NPs）作为增强型多功能电催化剂。原位预形成的铜镍纳米晶体与铂物种之间的电化学生成置换反应和原子扩散应是中空铂镍铜纳米颗粒形成的原因。通过酸洗和退火处理进行连续活化，以浸出表面上过量的铜和镍，并使表面上的铂含量富集。由于多种结构优势的合理整合，H-PtNiCu-AAT NPs对析氢反应、氧还原反应和甲醇氧化反应表现出优异的活性和耐久性。引人注目的是，在0.9 V（相对于可逆氢电极）下，H-PtNiCu-AAT NPs对氧还原反应的质量活性和比活性（0.977 A mg和1.458 mA cm）分别比商业铂碳（0.138 A mg和0.212 mA cm）高7.1倍和6.9倍。这项工作为设计具有优异活性和耐久性的低铂含量三金属电催化剂提供了一种有效的策略。
