摘要
Platinum(Pt)is an efficient catalyst for hydrogen evolution reaction(HER)and oxygen reduction reaction(ORR),but the debate of the relevance between the Pt particle size and its electrocatalytic activity still exist.The strong metal–support interaction(SMSI)between the metal and carrier causes the charge transfer and mass transport from the support to the metal.Herein,Pt species(0.5 wt.%)with various particle sizes supported on carbon nanotubes(CNTs)have been synthesized by a photo-reduction method.The^1.5 nm-sized Pt catalyst shows much higher HER performance than the counterparts in all pH solutions,and the mass activity of it is even 23–36 times that of Pt/C.While for ORR,the^3 nm-sized Pt catalyst exhibits the optimal performance,and the mass activity is 3 times and even 16 times that of Pt/C in acidic and alkaline media,respectively.The high HER and ORR performances of the^1.5 nm-and^3 nm-sized Pt catalysts benefit from the SMSI between Pt and the CNTs matrix and the higher ratio of face sites to edge sites,which is meaningful for the design of efficient electrocatalysts for renewable energy application.
铂(Pt)是析氢反应(HER)和氧还原反应(ORR)的高效催化剂,然而,关于铂颗粒粒径大小与其电催化活性之间相关性的争论仍然存在.金属-载体强相互作用(SMSI)是导致金属与载体之间电荷转移和质量转移的相互作用.本文采用光还原法合成了碳纳米管负载的不同粒径的Pt粒子(0.5 wt.%).在所有pH溶液中,尺寸约为1.5 nm的Pt催化剂的HER催化性能都明显高于同类催化剂,其质量活性甚至是Pt/C的23–36倍.而对于ORR,约3 nm的Pt催化剂表现出最佳的催化性能,在酸性和碱性条件下,其质量活性分别是Pt/C的3倍和16倍.~1.5和~3 nm大小的Pt催化剂分别表现出的较优异的HER和ORR性能,主要与铂和碳纳米管之间的相互作用有关,这为可再生能源电催化剂的设计提供了参考.
作者
Zhonghua Ma
Han Tian
Ge Meng
Lingxin Peng
Yafeng Chen
Chang Chen
Ziwei Chang
Xiangzhi Cui
Lianjun Wang
Wan Jiang
Jianlin Shi
马忠华;田汉;孟歌;彭凌欣;陈亚丰;陈昶;畅紫薇;崔香枝;王连军;江莞;施剑林(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;State Key Lab of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)
基金
support from the Natural Science Foundation of Shanghai(19ZR1479400)
the State Key Laboratory for Modication of Chemical Fibers and Polymer Materials,Donghua University(KF1818)
the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing(Wuhan University of Technology)。
