OER activate NixCo(1-x) NPs to NixCo(1-x)(OH)2 on cobalt foam with excellent supercapacitors performance

IF 3.4 3区化学 Q2 CHEMISTRY, PHYSICAL Catalysis Communications Pub Date : 2024-01-01 DOI:10.1016/j.catcom.2023.106829

Zexu Bai , Zuobo Yang , Jimmy Yun , Xin Liang , Jie Zhang

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Abstract

5-6 nm hydrophilic Ni_xCo_(1-x) NPs was synthesized by a cost-effective and scalable method and was coated onto conductive substrates without any binders or additives thanks to its small particle effect and possiblely magnetic effects. Then, the Ni_xCo_(1-x) NPs can be transformed into Ni_xCo_(1-x)(OH)₂ by an OER-activating strategy. Optimized by the composition effect, the Ni_0.8Co_0.2/CF exhibits best activity for supercapacitors (2124F/g). Underling mechanism of the OER evolution process well studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectrometry, X-ray absorption near-edge spectra (XANES). Density functional theory (DFT) calculations was performed and verify the synergistic effect of nickel and cobalt and the support effect.

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在泡沫钴上 OER 活化 NixCo(1-x) NPs 至 NixCo(1-x)(OH)2，使其具有优异的超级电容器性能

由于 NixCo(1-x) NPs 具有小颗粒效应和可能的磁效应，我们采用一种经济有效且可扩展的方法合成了 5-6 纳米的亲水性 NixCo(1-x) NPs，并将其涂覆在导电基底上，而无需任何粘合剂或添加剂。然后，通过 OER 激活策略将 NixCo(1-x) NPs 转化为 NixCo(1-x)(OH)2。通过成分效应的优化，Ni0.8Co0.2/CF 在超级电容器中表现出最佳活性（2124F/g）。通过 X 射线衍射 (XRD)、X 射线光电子能谱 (XPS)、拉曼光谱、X 射线吸收近边光谱 (XANES) 对 OER 演化过程的基本机制进行了深入研究。密度泛函理论（DFT）计算验证了镍和钴的协同效应以及支撑效应。

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来源期刊

Catalysis Communications 化学-物理化学

CiteScore

6.20

自引率

2.70%

发文量

183

审稿时长

46 days

期刊介绍： Catalysis Communications aims to provide rapid publication of significant, novel, and timely research results homogeneous, heterogeneous, and enzymatic catalysis.