articleJournal of the American Chemical SocietyJan 12, 2024HYBRID OA

Unraveling the pH-Dependent Oxygen Reduction Performance on Single-Atom Catalysts: From Single- to Dual-Sabatier Optima

DZDi ZhangZWZhuyu WangFLFangzhou LiuPYPeiyun YiLPLinfa Peng

Shanghai Jiao Tong University · Tohoku University · +2 more institutions

PubMed
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Abstract

Metal–nitrogen–carbon (M–N–C) single-atom catalysts (SACs) have emerged as a potential substitute for the costly platinum-group catalysts in oxygen reduction reaction (ORR). However, several critical aspects of M–N–C SACs in ORR remain poorly understood, including their pH-dependent activity, selectivity for 2- or 4-electron transfer pathways, and the identification of the rate-determining steps. Herein, by analyzing >100 M–N–C structures and >2000 sets of energetics, we unveil a pH-dependent evolution in ORR activity volcanos─from a single peak in alkaline media to a double peak in acids. We found that this pH-dependent behavior in M–N–C catalysts fundamentally stems from their moderate dipole moments and…

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Authors

8

Topics & keywords

Topics
Keywords
  • Chemistry
  • Dual (grammatical number)
  • Catalysis
  • Reduction (mathematics)
  • Oxygen atom
  • Oxygen reduction reaction
  • Oxygen
  • Atom (system on chip)
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