Rational design of porous nest-like basic Co-Ni carbonates on carbon cloth with optimized electrode process for efficient electrochemical energy storage
Jien Li , Die Pan , Pengfei Xu , Jianying Liang , Shuang Luo , Chenguo Hu
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引用次数: 0
Abstract
Bimetallic compound-based electrodes are composed of two different metallic elements with high electrical conductivity, electrochemical activity, and considerable theoretical capacity for supercapacitors. However, conventionally grown nickel-cobalt-based compounds tend to aggregate, greatly reducing the material surface's charge diffusion channels. Hence, by a series of processes to optimize the morphology and crystal structure, the porous nest-like Ni0.75Co0.25(CO3)0.125(OH)2·0.38 H2O (NCCO-2) derived from cobalt metal-organic frameworks (Co-MOF) are successfully anchored on activated carbon cloth (ACC). The unique microstructure with high specific surface area and abundant microstructure enables the NCCO@ACC-2 self-supported positive electrode with enhanced kinetics and optimized charge storage behavior, thus presenting an extraordinary capacitance of 7.18 F cm−2 and superior electrochemical stability. To assemble an asymmetric supercapacitor (ASC), nitrogen-doped ACC (NAC) is prepared as the negative electrode. Its rough surface has a large number of oxidized functional groups, graphite microstructure and defect sites for charge transfer and ion adsorption, thereby also achieving a capacitance of 8.18 F cm−2. The NCCO@ACC-2//NAC ASC exhibits outstanding energy density (1.09 mWh cm−2), power density (17 mW cm−2) and cycle stability and rate performance. This study provides a new method for preparing high-specific-capacity nickel-cobalt-based composite materials through nanoscale structure control, and the stable and efficient strategy has broad application prospects.
期刊介绍:
Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem.
Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.