Carbon nitride/positive carbon black anchoring PtNPs assembled by γ-rays as ORR catalyst with excellent stability

Liangsen Liu; Xiang Shi; Wei Wang; Mengfan Pei; Chunxia Hong; Yanling Xue; Zhiwei Xu; Feng Tian; Xingfeng Guo

doi:10.1088/1361-6528/abfabe

Carbon nitride/positive carbon black anchoring PtNPs assembled by γ-rays as ORR catalyst with excellent stability

Nanotechnology. 2021 May 31;32(34). doi: 10.1088/1361-6528/abfabe.

Authors

Liangsen Liu¹, Xiang Shi¹, Wei Wang¹, Mengfan Pei¹, Chunxia Hong², Yanling Xue², Zhiwei Xu¹, Feng Tian², Xingfeng Guo¹

Affiliations

¹ State Key Laboratory of Separation Membranes and Membrane Processes, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, People's Republic of China.
² Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, People's Republic of China.

PMID: 33887703
DOI: 10.1088/1361-6528/abfabe

Abstract

Electrocatalytic performance of low-cost graphitic carbon nitride (CN) is greatly limited by its limited conductivity and small specific surface area. Herein, a simple and cost-effective idea to produce novel nanocomposite is constructed by the CN and cetyl trimethyl ammonium bromide functionalized carbon black (CB) anchored platinum nanoparticles as highly efficient oxygen reduction catalysts based on gamma irradiation. The assembled carbon nitride/positive carbon black anchoring PtNPs (Pt/CN₂-CB⁺₁) catalyst exhibits significantly improved specific surface area, high graphitization, and uniformly dispersed ultra-small platinum nanoparticles. For the oxygen reduction reaction (ORR) performance, the catalyst shows more positive onset-potential (0.93 V versus RHE) and larger diffusion limiting current density (5.65 mA cm^-2) compared with benchmark Pt/C catalysts in alkaline medium. Moreover, the Pt/CN₂-CB⁺₁catalyst exhibits a small Tafel slope (92 mV dec^-1). Besides, the catalyst was demonstrated the remarkable methanol tolerance and good long-term stability under working conditions. This work provides a new and effectiveγ-rays irradiation for synthesizing the carbon nitride catalysts for energy conversion and storage applications.

Keywords: graphitic carbon nitride; oxygen reduction; platinum nanoparticles; γ-rays.