Metal-organic framework derived Ni/NiO micro-particles with subtle lattice distortions for high-performance electrocatalyst and supercapacitor

By Y. Jiao, Weizhao Hong, Peiying Li, Lixin Wang, Gang Chen. Applied Catalysis B: Environmental, 2019

236 citations recorded by the source corpus.

Abstract Herein, an effective and novel strategy has been designed to increase electrochemical reaction active sites in Ni/NiO nanoparticles prepared by optimizing the annealing temperature of nickel-based metal organic framework (Ni-MOF). Note that the incorporation of Ni3+ into the primitive lattice of Ni/NiO nanoparticles will cause a subtle atomic rearrangement, providing a large number of electrochemical reaction active sites. The density functional theory (DFT) simulation results also exhibit that the introduction of Ni3+ significantly lowers the gibbs free energy of atomic hydrogen absorption on the surface of Ni/NiO, benefiting H2 gas evolution. On the basis of the above advantages, the as-synthesized Ni/NiO nanoparticles exhibit excellent performance for supercapacitors (SCs, the areal specific capacitance of 684.4 m F cm−2 at 1 mA cm−2) and Hydrogen evolution reaction (HER, ultralow overpotential of 41 mV at 10 mA cm−2). Significantly, the all-solid-state flexible asymmetric SCs based on Ni/NiO as anode and CNTs-COOH as cathode displays a high energy density of 61.3 W h kg−1 at the power density of 900 W kg−1. This work highlights the crucial role of the lattice distortion of materials for future applications in the sustainable energy storage and conversion.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/24f6d759c4dfc347b0fb01faa85ca3d58b138f5d