Details

Autor(en) / Beteiligte

• Jiao, Yang
• Hong, Weizhao
• Li, Peiying
• Wang, Lixin
• Chen, Gang

Titel

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

Ist Teil von

• Applied catalysis. B, Environmental, 2019-05, Vol.244, p.732-739

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Subtle atomic arrangement distortion to provide additional active sites for HER and supercapacitor will occur in the NiO atomic layers with VNi incorporated into the primitive lattice. [Display omitted] •Nickel vacancies could give rise to the formation of subtle lattice distortion in Ni/NiO and regulate the exposed active sites in atomic scale.•The density functional theory simulation results also show that the introduction of nickel vacancies significantly lowers the gibbs free energy for atomic hydrogen absorption on Ni/NiO, benefiting H2 gas evolution.•The novel Ni/NiO nanoparticles exhibit superior performance for flexible Supercapacitors and Hydrogen evolution reaction. 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.