4.6 Article

Ordered Mesoporous Carbon Confined Highly Dispersed PtCo Alloy for the Oxygen Reduction Reaction: The Effect of Structure and Composition on Performance

Journal

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 60, Issue 41, Pages 14728-14736

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.1c03533

Keywords

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Funding

  1. National Key Research and Development Program of China [2018YFB1502700]
  2. National Natural Science Foundation of China [21908148]
  3. Sichuan Science and Technology Program [2020YJ0088]
  4. Fundamental Research Funds for the Central Universities

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Pt-based catalysts are currently the most promising catalysts for PEMFCs, but their sluggish kinetics for the ORR remains a challenge. This study demonstrates the potential of PtCo alloys with a specific intermetallic compound structure for improving the catalytic activity and durability for the ORR, offering insights into the design of efficient cathode catalysts for practical applications in fuel cells.
Pt-based catalysts are the most promising catalysts for proton exchange membrane fuel cells (PEMFCs) but still suffer from sluggish kinetics for the oxygen reduction reaction (ORR). Alloying Pt with transition-metal (M) elements is an efficient approach to modulate the electronic structure of Pt-based catalysts and improve the catalytic performance for the ORR. However, owing to the distinguishing surface state caused by different synthetic approaches, there still exist contradictory views about the relationship between the structure of Pt-based alloys and the catalytic performance for the ORR. In this work, PtCo alloys with a similar surface state but diverse structures and compositions are obtained by regulating the annealing temperatures and the precursor ratios. Accompanied by the structure and composition evolution, the electronic structure of Pt has also changed. PtCo@sOMC-900-1/3 with the intermetallic compound structure achieves the best kinetic activity as well as durability, indicating its potential for practical application. This work provides a more accurate understanding of the relationship between the alloy structure and the catalytic ORR performance and highlights a feasible strategy to mass-produce cathode catalysts for PEMFC applications.

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