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Grain boundary engineering for efficient and durable electrocatalysis

Journal Article · · Nature Communications
 [1];  [1];  [1];  [2];  [3];  [4];  [1];  [1];  [1];  [5]
  1. Max Planck Institute for Sustainable Materials, Düsseldorf (Germany)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
  3. Huazhong University of Science and Technology, Wuhan (China)
  4. Max Planck Institute for Sustainable Materials, Düsseldorf (Germany); Delft Univ. of Technology (Netherlands)
  5. Max Planck Institute for Sustainable Materials, Düsseldorf (Germany); Imperial College, London (United Kingdom)

Grain boundaries in noble metal catalysts have been identified as critical sites for enhancing catalytic activity in electrochemical reactions such as the oxygen reduction reaction. However, conventional methods to modify grain boundary density often alter particle size, shape, and morphology, obscuring the specific role of grain boundaries in catalytic performance. This study addresses these challenges by employing gold nanoparticle assemblies to control grain boundary density through the manipulation of nanoparticle collision frequency during synthesis. We demonstrate a direct correlation between increased grain boundary density and enhanced two-electron oxygen reduction reaction activity, achieving a significant improvement in both specific and mass activity. Additionally, the gold nanoparticle assemblies with high grain boundary density exhibit remarkable electrochemical stability, attributed to boron segregation at the grain boundaries, which prevents structural degradation. This work provides a promising strategy for optimizing the activity, selectivity, and stability of noble metal catalysts through precise grain boundary engineering.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2479501
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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