In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 19 ( 2023), p. 10228-10238
Abstract:
Rational design of pre-catalysts to in situ form active structures is vital for efficient catalysis, especially when surface reconstruction occurs. Here we report a surface engineering strategy to form highly active surfaces on Ni-based catalysts (NiMo in this work) under oxygen evolution reaction (OER) conditions. The NiMo catalyst is decorated with mononuclear Fe–O 5 species on its surface. During the OER reconstruction process, the Fe–O 5 species will further bond to the surface of Ni oxyhydroxide reconstructed from NiMo. In situ X-ray absorption spectroscopy and theoretical calculations reveal that the Fe–O 5 species anchored on Ni oxyhydroxide are easily oxidized under OER conditions, which compensates for the charges of Ni and increases the reducibility of Ni active sites. As a result, such a catalyst shows a 33-fold increase in intrinsic activity compared with the NiMo catalyst, which also decreases the full cell voltage by 0.72 V at 500 mA cm −2 in an anion exchange membrane electrolyzer compared with the IrO 2 catalyst.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
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