In situ hydrothermal growth of Ni-based hydrogen phosphate polyhedrons on Ni foam for efficient hydrogen evolution reaction
Year: 2024
Type: article
Abstract: The highlights for the manuscript are as follows:. • A green in-situ growth strategy was used to prepare the self-supporting electrode. • Ni hydrogen phosphate electrode was synthesized controllably via a facile hydrothermal method. • Synergistic effect among Ni hydrogen phosphate, NiO, and Ni foam contributed to the excellent alkaline HER activity. Developing a cost-effective and stable electrocatalyst is the key to achieve the large-scale applications of water electrolysis to produce green hydrogen. Herein, an in situ hydrothermal growth strategy was put forward to prepare a novel self-supporting electrode, that is, Ni-based hydrogen phosphate polyhedrons supported on 3D Ni foam. This electrode was composed of crystalline (Ni(H 2 PO 4 ) 2 ·2H 2 O, Ni(H 3 P 2 O 7 ) 2 ·2H 2 O), and amorphous phase in which NiO nanoparticles formed. The amorphous phase connected polyhedrons to the Ni foam substrate, forming multifarious heterogeneous interfaces. Such a structure possessed large number of active sites, favored the fast reaction kinetics and electron transport rate, synergistically resulting in a superior alkaline HER performance. In alkaline electrolyte, the electrode only needed a small overpotential of 69 mV to reach the current density of 10 mA cm −2 with a small Tafel slope of 56 mV dec −1 , and exhibited a good stability at the current density of 100 mA cm −2 for 50 h. This in situ hydrothermal growth strategy opened up a new route to green synthesis of cost-effective and stable 3D heterostructured self-supporting electrode for water-splitting. An in situ hydrothermal growth strategy was used to prepare a novel Ni-based hydrogen phosphate polyhedrons self-supporting electrode. The electrode has multifarious heterogeneous interfaces, large number of active sites, and fast electron transport rate, synergistically resulting in a superior alkaline HER performance. Moreover, it exhibits a good stability at the high current density of 100 mA cm −2 for 50 h.
Institution: Shenyang University of Chemical Technology
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: diamond
Funders: National Natural Science Foundation of China, Natural Science Foundation of Liaoning Province, Department of Education of Liaoning Province, Scientific Research Fund of Liaoning Provincial Education Department, Liaoning Revitalization Talents Program, Key Technologies Research and Development Program, National Key Research and Development Program of China
OpenAlex ID: W4402726466