Accessible mesoporous carbon aerogel preparation and its application as ultra-low pt support for oxygen reduction reaction with high catalytic activity

Abstract

Carbon supported Pt and its alloys (Pt/C) are the most practical catalysts for oxygen reduction reaction (ORR). To further reduce scare Pt content in the Pt/C is of great importance for its widely application. Carbon substrate plays a critical role in decreasing Pt proportion. In this research, accessible pores carbon aerogel is prepared to be support for Pt nanoparticles by sol–gel method. A mild reduction agent H2 is choose to produce ultra-small Pt nanoparticles with only 1.5 nm diameter. The carbon aerogel could lower Pt to be ultra-low content of 4.2% mass percentage. Ultra-small Pt nanoparticles are uniformly dispersed on the carbon aerogel, which is significant for improving Pt utilization and catalytic performance. The Pt/carbon aerogel, is of high ORR catalytic activity with electrochemical surface area 188 m2 g−1 Pt, mass activity 107 mA mg−1Pt and low Tafel slope 47.87 mV dec−1, which could be ascribed to carbon aerogel support with high mesoporous surface area of 500 m2/g. Pt/carbon aerogel were comprehensively studied by N2 adsorption/desorption, SEM, TEM, XPS and XRD to reveal relations between properties and structures. Based on the research results, the Pt/carbon aerogel is a kind of promising low Pt catalyst for ORR.

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (51302317 and 51702360) and Natural Science Foundation of Hunan Province (2018JJ2469).

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Correspondence to Junzong Feng or Jian Feng.

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Luo, Y., Feng, J., Jiang, Y. et al. Accessible mesoporous carbon aerogel preparation and its application as ultra-low pt support for oxygen reduction reaction with high catalytic activity. J Porous Mater (2021). https://doi.org/10.1007/s10934-020-01010-y

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Keywords

  • Carbon aerogel
  • Accessible mesoporous pores
  • Pt support
  • Oxygen reduction reaction
  • Pemfcs