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Title: Short Hydrogen Bonds on Reconstructed Nanocrystal Surface Enhance Oxygen Evolution Activity

Journal Article · · ACS Catalysis
 [1];  [1];  [1];  [2]; ORCiD logo [3];  [3];  [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [1]
  1. Peking Univ., Shenzhen (People's Republic of China)
  2. Peking Univ., Shenzhen (People's Republic of China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Case Western Reserve Univ., Cleveland, OH (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)

Here, water splitting to generate hydrogen and oxygen gas is critical to renewable energy technologies, including fuel cells and rechargeable metal–air batteries. The oxygen evolution reaction (OER) has long been the bottleneck of water splitting because of its high overpotential (η) and sluggish kinetics, and development of efficient, stable, and non-noble-metal-based OER catalysts has been an extensively studied topic. Here, we propose short hydrogen bonds on reconstructed nanocrystal surface to enhance oxygen evolution activity by investigating three types of phase structures (βII, βI, and γ0) of Li2CoSiO4 (LCS) nanoparticles as OER electrocatalysts. Among them, the βII-LCS outperforms the previously reported Co-based catalysts and the state-of-the-art IrO2 catalyst for OER in the alkaline condition. Our experiments combined with ab initio calculations indicated that due to the line-linked arrangement of Co active sites at the surface of βII-LCS, short hydrogen bonds (2.54 Å) are formed and linked into a network at the reconstructed surface by rotating the flexible CoO4 tetrahedra after surface delithiation, thus facilitating proton transfer and dissociation, leading to a unique dual-center catalytic pathway with low theoretical thermodynamic overpotential (0.35 eV) for the OER process.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1461413
Journal Information:
ACS Catalysis, Vol. 8, Issue 1; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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