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ORIGINAL PAPER

In situ synthesis of Ag/NiO derived from hetero‑metallic MOF for supercapacitor application Lin‑Xia Zhou1 · Yuan‑Yuan Yang1,2 · Hong‑Lin Zhu1,2 · Yue‑Qing Zheng1,2 Received: 11 June 2020 / Accepted: 12 November 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020

Abstract Nanocomposite metal oxides have been attracted great attention in the electrode material of supercapacitor. Herein, a novel Ag/Ni hetero-metallic complex with the hamburger-like structure was prepared, which was then calcined to form Ag/NiO nanocomposite via in-situ preparation. The in-situ formed Ag/NiO exhibits a very high capacitance of 1480 F g −1 at a current density of 0.6 A g­ −1 in 1 M KOH solution, and the cycling stability was retained about 85% after 3000 cycles with the current of 5 A ­g−1. The results showed that the in-situ formed Ag/NiO derived from hetero-metallic MOF possess high specific capacitance, which could provide a new effective strategy to improve the conductivity of metal oxides nanocomposite. Keywords  Supercapacitor · Metal–organic frameworks · Nickel oxide · Ag doped · Specific capacitance

Introduction The ever-increasing energy needs issues have grown up an urgent need for the development of renewable, sustainable, clean, and highly efficient energy storage devices. Among various energy storage devices, supercapacitor have attracted more eye-catching due to the good circulation performance, fast charge and discharge ability, high power density, and the advantages of environmental friendly, which are subject to the attention of the researchers in many areas (Shu et al. 2019; Zheng et al. 2015; Zhang et al. 2020). According to the charge-storage mechanism and structure of capacitors, supercapacitor can be divided into electrical double-layer capacitors (EDLCs) and pseudo-capacitors. The charge Electronic supplementary material  The online version of this article (https​://doi.org/10.1007/s1169​6-020-01431​-8) contains supplementary material, which is available to authorized users. * Yue‑Qing Zheng [email protected] 1



Joint Laboratory for Environmental Test and Photocatalytic Research of Ningbo University‑Zhejiang Zhonghao Applied Engineering Technology Institute Co., Ltd, Ningbo University, Ningbo 315211, People’s Republic of China



Chemistry Institute for Synthesis and Green Application, School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, People’s Republic of China

2

separation of EDLCs originates from the electrode/electrolyte interface, which is similar to that of the traditional capacitor (Aldama et al. 2017; Chen et al. 2017a, b). The characteristic of EDLCs is the different carbon materials such as carbon nanotubes, graphene, and carbon nanomesh clusters, which are often used as EDLCs to obtain high surface area and capacitance (Zhang et al. 2017; Kierzek et al. 2004; Chen et al. 2020). However, the relatively low specific capacitance of carbon material electrodes have severely limited in advanced research of the EDLCs. For pseudo-capac