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Synthesis of 2H/fcc-Heterophase AuCu Nanostructures for Highly Efficient Electrochemical CO2 Reduction at Industrial Current Densities

Journal Article · · Advanced Materials
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  1. City Univ. of Hong Kong, Kowloon (Hong Kong)
  2. Hong Kong University of Science and Technology (HKUST) (Hong Kong)
  3. Southeast Univ., Nanjing (China)
  4. City Univ. of Hong Kong, Kowloon (Hong Kong); Chinese Academy of Sciences (CAS), Shenzhen (China)
  5. City Univ. of Hong Kong, Kowloon (Hong Kong); Chinese Academy of Sciences (CAS), Hefei (China)
  6. The Chinese University of Hong Kong, Ma Liu Shui, Shatin (Hong Kong)
  7. Nanyang Technological Univ. (Singapore)
  8. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  9. City Univ. of Hong Kong, Kowloon (Hong Kong); City Univ. of Hong Kong, Shenzhen (Hong Kong)
+ Show Author Affiliations
Structural engineering of nanomaterials offers a promising way for developing high-performance catalysts toward catalysis. However, the delicate modulation of thermodynamically unfavorable nanostructures with unconventional phases still remains a challenge. Here, in this study, the synthesis of hierarchical AuCu nanostructures is reported with hexagonal close-packed (2H-type)/face-centered cubic (fcc) heterophase, high-index facets, planar defects (e.g., stacking faults, twin boundaries, and grain boundaries), and tunable Cu content. The obtained 2H/fcc Au99Cu1 hierarchical nanosheets exhibit excellent performance for the electrocatalytic CO2 reduction to produce CO, outperforming the 2H/fcc Au91Cu9 and fcc Au99Cu1. The experimental results, especially those obtained by in-situ differential electrochemical mass spectroscopy and attenuated total reflection Fourier-transform infrared spectroscopy, suggest that the enhanced catalytic performance of 2H/fcc Au99Cu1 arises from the unconventional 2H/fcc heterophase, high-index facets, planar defects, and appropriate alloying of Cu. Impressively, the 2H/fcc Au99Cu1 shows CO Faradaic efficiencies of 96.6% and 92.6% at industrial current densities of 300 and 500 mA cm-2, respectively, as well as good durability, placing it among the best CO2 reduction electrocatalysts for CO production. The atomically structural regulation based on phase engineering of nanomaterials (PEN) provides an avenue for the rational design and preparation of high-performance electrocatalysts for various catalytic applications.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Hong Kong Research Grants Council (RCG); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0012704
OSTI ID:
2432576
Report Number(s):
BNL--225955-2024-JAAM
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 51 Vol. 35; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE