Binder-free engineering design of Ni-MOF ultrathin sheet-like grown on PANI@GO decorated nickel foam as an electrode for in hydrogen evolution reaction and asymmetric supercapacitor

In this study, Ni3(benzene 1,3,5-tricarboxylic acid)@polyaniline-rGO nanocomposite (Ni-MOF@PANI-rGO) is fabricated by a two-step procedure involving polymerization and hy-drothermal operations. This nanocomposite-based Ni-MOF was designed for binder-free surface modification of nickel foam (NF). This is offered a novel approach for enhancing the electrochemical performance, and even energy density with a wider operating poten-tial window. An in-situ Ni-MOF was then synthesized on polyaniline@GO (PANI-GO) using an NH-fragment linker and an in-situ hydrothermal technique. The electrochemical behavior of the nanocomposite was studied in asymmetric systems and exhibited outstanding electrochemical performance, high energy density, and power density (73.99 Wh kg-1 at 848.29 W kg-1). The electrode also showed a high specific capacity (1680 C g-1 at 1.0 A g-1) and exceptional cycling stability (92 ⁒) after 5000 cycles in a three -electrode system. The present results imply a direct application of Ni-MOF@PANI-rGO composite as a bridge performance between supercapacitors and batteries. In addition, the electrocatalyst activity of Ni-MOF@PANI-rGO toward hydrogen evolution reaction (HER) was investigated by linear sweep voltammetry at a scan rate of 10 mV s-1 in 1.0 M KOH. The results showed that Ni-MOF@PAN-rGO acts as a suitable electrocatalyst with the lowest overpotential at 10, 50, and 80 mA cm-2 and the lowest Tafel slope.& COPY; 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

A nanocomposite, Ni-MOF@PANI-rGO, was fabricated using a two-step procedure and utilized for surface modification of nickel foam to enhance electrochemical performance and energy density. The nanocomposite exhibited outstanding electrochemical performance, high energy density, and power density, making it a potential bridge between supercapacitors and batteries. Additionally, the nanocomposite showed excellent electrocatalytic activity for the hydrogen evolution reaction.