期刊
SMALL
卷 17, 期 47, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202103785
关键词
active edge sites; density functional theory; electrocatalysts; nanosheet arrays; water oxidation
类别
资金
- National Key Research and Development Program of China [2017YFA0207204, 2016YFA0203101]
- National Natural Science Foundation of China [21836002, 21876190, 21902182]
- Fundamental Research Funds for the Central Universities [2020001840, 2021YQHH04]
- Key Research and Development Program of Ningxia [2017BY064]
A strategy for preparing Ni-Fe layered double hydroxide (NiFe-LDH) with abundant exposed edge planes for enhanced oxygen evolution reaction (OER) is reported in this study. The NiFe-LDH/C material shows superior OER performance at a current density of 50 mA cm(-2) due to its unique structural engineering and exposed active edge sites.
Here, a strategy is reported to prepare Ni-Fe layered double hydroxide (NiFe-LDH) with abundant exposed edge planes for enhanced oxygen evolution reaction (OER). The edge-to-edge assembly of ultrafine NiFe-LDH directed by graphite-like carbon is performed through a one-step hydrothermal process to form self-supporting nanosheet arrays (named NiFe-LDH/C), in which ascorbic acid is employed as the carbon precursor to control both the platelet size and the assembly mode of NiFe-LDH. Benefiting from the unique structural engineering, NiFe-LDH/C can not only achieve a fast surface reconstruction into the highly active gamma-phase structure, but also exposes abundant active edge sites, thus leading to a superior OER performance with the overpotential as low as 234 mV at a current density of 50 mA cm(-2). Furthermore, density functional theory (DFT) calculations reveal that the unsaturated Fe-sites and the bridge-sites connecting Ni and Fe atoms, which only exist on the edge planes of NiFe-LDH, are the main active centers responsible for promoting the intrinsic OER activity. This work provides a specific and valuable reference for the rational design of high-quality electrocatalysts through structural engineering for renewable energy applications.
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