Optimizing nanostructure and constructing heterostructure via Mo/W incorporation to improve electrochemical properties of NiCoP for hybrid supercapacitors

作     者：Quan Zong Daiwen Tao Hui Yang Jianhui Zhan Xiong Liu Jiangying Wang Qilong Zhang Guozhong Cao 宗泉;陶代文;杨辉;詹建辉;刘雄;王疆瑛;张启龙;曹国忠

作者机构：College of Materials and ChemistryChina Jiliang UniversityHangzhou 310018China School of Materials Science and EngineeringState Key Lab Silicon MatZhejiang UniversityHangzhou 310027China ZJU-Guangxi-ASEAN Innovation&Research CenterNanning 530022China Department of Materials Science and EngineeringUniversity of WashingtonSeattleWA 98195USA 

基　　金：financially supported by the National Natural Science Foundation of China (51772267) the Science and Technology Program of Guangxi Zhuang Autonomous Region (ZD20302001) 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2022年第65卷第5期

页      码：1195-1206页

摘      要：Transition metal phosphides(TMPs) are promising battery-type electrodes for hybrid supercapacitors(HSCs) due to their high electrical conductivity and electrochemical activity. Constructing TMPs with fast kinetics and stable structure is requisite to realize high-performance HSCs but remains a challenge. Herein, we incorporate Mo(or W)into Ni Co P to form Ni-Co-Mo-P(or Ni-Co-W-P) heterostructures with a unique three-dimensional(3 D) open morphology and modified electronic structure. Electrochemical analyses and density functional theory(DFT) calculations reveal that the incorporation of Mo/W enables Ni Co P with optimized nanostructure, high conductivity, abundant reaction active sites and enhanced reaction kinetics. As a result, the designed Ni-Co-Mo-P heterostructure delivers a high areal capacity of 4.08 C cm^(-2)(703 C g^(-1)) at 2 m A cm^(-2)and3.25 C cm^(-2) at 30 m A cm^(-2) with a good cycling stability, superior to those of Ni Co P and Ni-Co-W-P counterparts. The practical feasibility of the Ni-Co-Mo-P heterostructure is further demonstrated by an energy conversion and storage system consisting of commercial solar cell and Ni-Co-Mo-P//activated carbon(AC) device, which could obtain a high energy density of 53.3 W h kg^(-1)at a power density of 800 W kg^(-1).All-solid-state Ni-Co-Mo-P//AC device further illustrates the superior flexibility and makes a strong candidate for wearable energy storage electronics.

主 题 词：NiCoP Mo/W incorporation DFT calculations hybrid supercapacitors 

学科分类：081702[081702] 080801[080801] 0808[工学-自动化类] 08[工学] 0817[工学-轻工类] 

核心收录：

D　O　I：10.1007/s40843-021-1904-x

馆 藏 号：203109015...