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Versatile Technique to Produce a Hierarchical Design in Nanoporous Gold
Published on: February 10, 2023
Synergistic design of hierarchical and heterostructural P-NiMoO4@Net-like Ni2P for enhanced hydrogen evolution
Jian Tang1, Jun Fang1, Haochen Yao1
1National Engineering Research Center of Vacuum Metallurgy, Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093 Yunnan, China.
Abstract:
Hierarchical structure design and heterostructure engineering are effective strategies for enhancing hydrogen evolution reaction (HER) performance, yet their synergistic integration remains underexplored. In this work, a novel hierarchical P-NiMoO4@Net-like Ni2P heterostructure HER electrocatalyst was prepared via a two-step hydrothermal method followed by low-temperature phosphorization. The three-dimensional net like Ni2P was closely integrated with one-dimensional phosphorus-doped NiMoO4 micro/nanorod arrays, enabling hierarchical structural assembly and the formation of synergistic heterointerfaces. The hierarchical structure significantly increased active site exposure, with a double-layer capacitance of 254.4 mF cm-2, more than five times that of single-component Ni2P (48.4 mF cm-2). Density functional theory calculations revealed that the heterostructure lowered the d-band center of active Ni3 sites and optimized the hydrogen adsorption energy, thereby enhancing HER activity. The P-NiMoO4@Net-like Ni2P catalyst exhibited an alkaline HER overpotential of 49 mV at a current density of 10 mA cm-2. It also maintained stable operation for 100 h at 10mA cm-2 and 120 h at 100mA cm-2. This study demonstrates the potential of integrating hierarchical and heterostructural strategies, providing a reference for advanced nanostructured catalyst development.
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