Dense platinum/nickel oxide heterointerfaces with abundant oxygen vacancies enable ampere-level current density ultrastable hydrogen evolution in alkaline

Wang, Kaixi, Wang, Shuo, Hui, Kwan San, Li, Junfeng, Zha, Chenyang, Dinh, Duc Anh, Shao, Zongping, Yan, Bo, Tang, Zikang and Hui, Kwun Nam (2023) Dense platinum/nickel oxide heterointerfaces with abundant oxygen vacancies enable ampere-level current density ultrastable hydrogen evolution in alkaline. Advanced Functional Materials, 33 (8). ISSN 1616-301X

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Abstract

Platinum (Pt) remains the benchmark electrocatalyst for alkaline hydrogen evolution reaction (HER), but its industry-scale hydrogen production is severely hampered by the lack of well-designed durable Pt-based materials that can operate at ampere-level current densities. Herein, based on the original oxide layer and parallel convex structure on the surface of nickel foam (NF), a 3D quasi-parallel architecture consisting of dense Pt nanoparticles (NPs) immobilized oxygen vacancy-rich NiOx heterojunctions (Pt/NiOx-OV) as an alkaline HER catalyst is developed. A combined experimental and theoretical studies manifest that anchoring Pt NPs on NiOx-OV leads to electron-rich Pt species with altered density of states (DOS) distribution, which can efficiently optimize the d-band center and the adsorption of reaction intermediates as well as enhance the water dissociation ability. The as-prepared catalyst exhibits extraordinary HER performance with a low overpotential of 19.4 mV at 10 mA cm−2, a mass activity 16.3-fold higher than that of 20% Pt/C, and a long durability of more than 100 h at 1000 mA cm−2. Furthermore, the assembled alkaline electrolyzer combined with NiFe-layered double hydroxide requires extremely low voltage of 1.776 V to attain 1000 mA cm−2, and can operate stably for more than 400 h, which is rarely achieved.

Item Type:	Article
Additional Information:	Funding Information: This work was financially supported by the Science and Technology Development Fund, Macau SAR (File no. 0191/2017/A3, 0041/2019/A1, 0046/2019/AFJ, 0021/2019/AIR, 0007/2021/AGJ), University of Macau (File no. MYRG2017-00216-FST, MYRG2018-00192-IAPME, MYRG2020-00187-IAPME, MYRG2022-00223-IAPME), the UEA funding, and the Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grant number 05/2019/TN. The DFT calculations are performed at High Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at University of Macau.
Uncontrolled Keywords:	hydrogen evolution reactions,large current densities,oxygen vacancy-rich nickel oxides,platinum-based heterostructures,quasi-parallel nanostructures,electronic, optical and magnetic materials,chemistry(all),biomaterials,materials science(all),condensed matter physics,electrochemistry,sdg 7 - affordable and clean energy ,/dk/atira/pure/subjectarea/asjc/2500/2504
Faculty \ School:	Faculty of Science > School of Engineering (former - to 2024)
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	25 Apr 2024 10:31
Last Modified:	30 Jan 2025 02:38
URI:	https://ueaeprints.uea.ac.uk/id/eprint/95005
DOI:

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