Nano-thin heterogeneous NiCo MOF/NiO nanosheets for high-rate energy storage

Nan, W.; Li Yu; Zhang, J.; Wang, F.; Liu, X.; Chen, Z.; Xiang, J.; Savilov, S.V.; Sobolev, A.V.; Wang, L.; Li Zhongyuan; Chen, M.

Авторы: Nan Wei, Li Yu, Zhang Jiawei, Wang Fan, Liu Xin, Chen Zhen, Xiang Jiayuan, Savilov Serguei V., Sobolev Alexey V., Wang Lei, Li Zhongyuan, Chen Minghua
Журнал: Surface and Coatings Technology
Том: 497
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 131781
DOI: 10.1016/j.surfcoat.2025.131781
Аннотация: Nickel-based materials can perform redox reactions in aqueous alkaline electrolytes, promising to assemble low-cost and high-safety electrochemical devices with attractive energy/power density. Nevertheless, the poor intrinsic electronic/ionic conductivity and low redox activity restrict these materials' reversible capacity and rate performance. Herein, amorphous NiO-coated NiCo metallic organic framework nanosheets (NiCo-MOF/NiO) which combine the advantages of heterostructure and two-dimensional structure are fabricated via a simple hydrothermal reaction and atomic layer deposition. In general, the two-dimensional structure accelerates the diffusion of ions along the material surface, resulting in rapid ion diffusion kinetics. In-situ Raman results suggest that constructing heterostructure can improve the redox kinetics of NiCo-MOF and facilitate the oxidation of Ni ions toward high valence state, leading to effectively boosted capacitance. As a result, the NiCo-MOF/NiO electrode with optimized Ni/Co ratio and NiO coating thickness exhibits a high areal capacitance of 3010 mF cm−2 at 5 mA cm−2 and remains 62.5 % of initial capacitance over 5000 cycles, much better than that of pure NiCo MOF (2150 mF cm−2). In addition, the asymmetric supercapacitor (ASC) constructed with NiCo-MOF as the positive electrode and commercial activated carbon (AC) as the negative electrode exhibits a large operating voltage window of 1.6 V, with an areal capacitance of 34.4 mF cm−2 at a current density of 11 mA cm−2, and retains 77.8 % of its initial capacity after 5000 cycles. This work may provide a reference for advanced Ni-based electrode design by constructing heterostructures.
Добавил в систему: Соболев Алексей Валерьевич

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