Electronic Modulation of the 3D Architectured Ni/Fe Oxyhydroxide Anchored N-Doped Carbon Aerogel with Much Improved OER Activity

It remains a big challenge to develop non-precious metal catalysts for oxygen evolution reaction (OER) in energy storage and conversion systems. Herein, a facile and cost-effective strategy is employed to in situ prepare the Ni/Fe oxyhydroxide anchored on nitrogen-doped carbon aerogel (NiFeO (OH) @N...

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Bibliographic Details
Published in:	Gels 2023-02, Vol.9 (3), p.190
Main Authors:	Lu, Jiaxin, Hao, Wenke, Wu, Xiaodong, Shen, Xiaodong, Cui, Sheng, Shi, Wenyan
Format:	Article
Language:	eng
Subjects:	Adsorption Aerogels Carbon carbon aerogel Catalysts Density functional theory Density functionals DFT calculations Electric properties Electrical conductivity Electrical resistivity Electrocatalysts Electrolytes Electron transport Electronic structure Energy consumption Energy conversion Energy storage Force and energy Iron Nanoparticles Ni/Fe oxyhydroxide Nickel nitrogen doping OER Oxygen evolution reactions Porous materials System effectiveness
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Summary:	It remains a big challenge to develop non-precious metal catalysts for oxygen evolution reaction (OER) in energy storage and conversion systems. Herein, a facile and cost-effective strategy is employed to in situ prepare the Ni/Fe oxyhydroxide anchored on nitrogen-doped carbon aerogel (NiFeO (OH) @NCA) for OER electrocatalysis. The as-prepared electrocatalyst displays a typical aerogel porous structure composed of interconnected nanoparticles with a large BET specific surface area of 231.16 m ·g . In addition, the resulting NiFeO (OH) @NCA exhibits excellent OER performance with a low overpotential of 304 mV at 10 mA·cm , a small Tafel slope of 72 mV·dec , and excellent stability after 2000 CV cycles, which is superior to the commercial RuO catalyst. The much enhanced OER performance is mainly derived from the abundant active sites, the high electrical conductivity of the Ni/Fe oxyhydroxide, and the efficient electronic transfer of the NCA structure. Density functional theory (DFT) calculations reveal that the introduction of the NCA regulates the surface electronic structure of Ni/Fe oxyhydroxide and increases the binding energy of intermediates as indicated by the d-band center theory. This work provides a new method for the construction of advanced aerogel-based materials for energy conversion and storage.
ISSN:	2310-2861 2310-2861