N-doped LaPO4: An effective Pt-free catalyst for electrocatalytic oxygen reduction

Ruopeng Zhao, Ziheng Chen, Qinghua Li, Xuan Wang, Yawen Tang, Gengtao Fu, Hao Li, Jong Min Lee, Shaoming Huang

Research output: Contribution to journalArticlepeer-review


This work provides a novel rare-earth-based catalyst of N-regulated lanthanum phosphate (N-LaPO4/C) and the corresponding rational measurement of catalytic activity for the oxygen reduction reaction (ORR). Developed N-LaPO4/C displays more positive half-wave potential (0.88 V) and onset potential (1.02 V) for the ORR, surpassing commercial Pt/C (0.96 and 0.85 V) and most reported research works. The robust stability of N-LaPO4/C for the ORR is also demonstrated. Comprehensive analyses through X-ray absorption spectroscopy, surface Pourbaix diagram, microkinetic modeling, and data mining based on an advanced explainable machine learning demonstrate a self-oxidation process on LaPO4 during the alkaline ORR and identify the key role of N in LaPO4 in promoting ORR. N-doped LaPO4 in N-LaPO4/C is found to be an active center. Further findings show that N-LaPO4/C + RuO2 can be applied in rechargeable Zn-air batteries as an air cathode, showing a good power density and a long cycle life.

Original languageEnglish
Pages (from-to)3590-3606
Number of pages17
JournalChem Catalysis
Issue number12
Publication statusPublished - 2022 Dec 15


  • machine learning
  • N-regulated lanthanum phosphate,
  • oxygen reduction reaction,
  • SDG7: Affordable and clean energy
  • theoretical calculations,
  • X-ray absorption spectroscopy,

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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