Interfacial Electron Redistribution of Hydrangea‐like NiO@Ni2P Heterogeneous Microspheres with Dual‐Phase Synergy for High‐Performance Lithium–Oxygen Battery. Issue 10 (14th January 2022)

• Record Type: Journal Article
• Authors: Yan, Yu; Ran, Zhiqun; Zeng, Ting; Wen, Xiaojuan; Xu, HaoYang; Li, Runjing; Zhao, Chuan; Shu, Chaozhu
• Is Part Of: Small. Volume 18:Issue 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-14
• Subjects: electrocatalysts -- interface interpenetration -- interfacial electron transfer -- lithium–oxygen batteries -- NiO@Ni 2P heterogeneous; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202106707
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Lithium–oxygen batteries (LOBs) with ultra‐high theoretical energy density (≈ 3500 Wh kg −1 ) are considered as the most promising energy storage systems. However, the sluggish kinetics during the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) can induce large voltage hysteresis, inferior roundtrip efficiency and unsatisfactory cyclic stability. Herein, hydrangea‐like NiO@Ni2 P heterogeneous microspheres are elaborately designed as high‐efficiency oxygen electrodes for LOBs. Benefitting from the interfacial electron redistribution on NiO@Ni2 P heterostructure, the electronic structure can be modulated to ameliorate the chemisorption of the intermediates, which is confirmed by density functional theory (DFT) calculations and experimental characterizations. In addition, the interpenetration of the PO bond at the NiO@Ni2 P heterointerface leads to the internal doping effect, thereby boosting electron transfer to further improve ORR and OER activities. As a result, the NiO@Ni2 P electrode shows a low overpotential of only 0.69 V, high specific capacity of 18254.1 mA h g −1 and superior long‐term cycling stability of over 1400 h. The exploration of novel bifunctional electrocatalyst in this work provides a new solution for the practical application of LOBs. Abstract : Hydrangea‐like NiO@Ni2 P heterostructure with unique electron restructuring interface facilitates the exposure of abundant active sites and accelerates Li + and O2 transport at the electrode/electrolyte interface, which efficiently boosts the interface reaction kinetics during the discharging and charging process and enhances the electrochemical performances of Li–O2 battery.