Journal
INORGANIC CHEMISTRY
Volume 60, Issue 9, Pages 6764-6771Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c00595
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Funding
- National Natural Science Foundation of China [22005126, 22022108]
- Natural Science Foundation of Jiangsu Province [BK20191466]
- Xuzhou City [KC20061]
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Efficient and robust bifunctional electrocatalysts are crucial for hydrogen production by water splitting. The Ni@N-C electrocatalyst, with regulated electronic structure and abundant active sites, demonstrates remarkable activity in hydrogen evolution due to electron transfer and redistribution, as well as synergistic effects between Ni and N-doped carbon layers.
Developing efficient and robust bifunctional electrocatalysts are in high demand for the production of hydrogen by water splitting. Engineering an electrocatalyst with a regulated electronic structure and abundant active sites is an effective way to enhance the electrocatalytic activity. Herein, N-doped C-encapsulated Ni nanoparticles (Ni@N-C) are synthesized through a traditional hydrothermal reaction, followed by pyrolyzing under an Ar/H-2 atmosphere. The electrochemical measurements and density functional theory (DFT) calculations reveal that the electron transfer between the Ni core and the N-C shell induces the electron density redistribution on Ni@N-C, which directly promotes the adsorption and desorption of H* on the N-doped carbon (N-C) layer and thus dramatically enhances hydrogen production. Taking advantage of the porous spherical structure and the synergistic effects between Ni and N-doped carbon (N-C) layer, we obtain a Ni@N-C electrocatalyst that exhibits remarkable hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activity with low overpotentials of 117 and 325 mV, respectively. Impressively, the assembled cell using Ni@N-C as both anode and cathode exhibits excellent activity as well as stable cyclability for over 12 h.
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