Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202107056
Keywords
amorphous NiCoMo oxides; crystalline-amorphous heterostructures; electrocatalysis; oxygen evolution reaction; synchronous synthesis
Categories
Funding
- Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology [201805056ZD7CG40]
- National Natural Science Foundation of China [21405119]
- Natural Science Basic Research Plan in Shaanxi Province of China [2015JQ2046]
- China Postdoctoral Science Foundation [2014 M562392]
- Fundamental Research Funds for the Central Universities [08143099]
- Open Funds of State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University) [202018]
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The synchronous dual-phase synthesis of crystalline Ag and amorphous NiCoMo oxides on nickel foam resulted in a highly efficient and stable OER electrocatalyst. The dense c-a interfacial sites effectively modulate the electronic structure of the interfacial sites and promote phase transition, enhancing catalytic performance.
The crystalline-amorphous (c-a) heterostructure is verified as a promising design for oxygen evolution reaction (OER) catalysts due to the concerted advantages of the crystalline and amorphous phase. However, most heterostructures via asynchronous heterophase synthesis suffer from the limited synergistic effect because of the sparse c-a interfaces. Here, a highly efficient and stable OER electrocatalyst with dense c-a interfacial sites is reported by hybridizing crystalline Ag and amorphous NiCoMo oxides (NCMO) on the nickel foam (NF) via synchronous dual-phase synthetic strategy. In 1 m KOH, the as-obtained Ag/NCMO/NF catalyst exhibits a low OER overpotential of 243 mV to attain 10 mA cm(-2) and a small Tafel slope of 67 mV dec(-1). Theoretical calculations indicate that the c-a interface can efficiently modulate the electronic structure of the interfacial sites and lower the OER overpotential. Besides, in situ Raman spectroscopy results demonstrate that the c-a interfacial sites can promote the irreversible phase transition to the metal oxy(hydroxide) active phase, and the dense c-a interfaces can stabilize the active phase during the whole OER process.
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