Facile fabrication of N-doped RGO decorated CoS2 nanoparticles as advanced integrated electrode for enhanced supercapacitor performance

IF 5.5 3区 材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2024-11-01 DOI:10.1016/j.electacta.2024.145312
Xiaona Li , Weiyang Zhang , Zhengyan Gu , Qingbin Cai , Hongwei Kang , Baocheng Yang , Zhikun Li
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Abstract

Transition metal sulfides (TMSs) are a class of advanced electrode materials for new energy storage devices with superior performance due to their many advantages, such as high specific capacity, good conductivity, low electronegativity, high redox activity, rich variety and low price. Herein, we developed N-doped reduced graphene oxide (N-RGO) decorated CoS2 nanoparticles nanohybrids (N-RGO/CoS2, denoted as NGCS) by a facile hydrothermal method. The doped-N process enriches the specific surface area and porosity of RGO nanosheets, which not only forms rich network nanostructures conducive to rapid charge/ion transport, but also promotes more dispersed anchoring of CoS2, resulting in the formation of smaller-sized CoS2 nanoparticles that can provide rich and exposed electroactive sites. Therefore, such unique hierarchical porous nanostructures help all components in the nanohybrids to “complement each other's strengths”, so that the fabricated NGCS electrode exhibits a high specific capacitance of 797.1 F g−1 at 0.6 A g−1 and an excellent rate capability with 77.5 % retention (20 A g−1). Furthermore, the assembled NGCS//AC hybrid supercapacitor (HSC) delivers excellent energy density of 41.4 Wh kg−1 (at 719.7 W kg−1) and long-term cyclability with 86.02 % capacitance retention after 13,000 cycles, presenting a promising application potential in new high-performance energy storage and conversion devices.

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轻松制备掺杂 N 的 RGO 装饰 CoS2 纳米粒子,作为先进的集成电极提高超级电容器性能
过渡金属硫化物(TMSs)具有比容量高、导电性好、电负性低、氧化还原活性高、种类丰富、价格低廉等诸多优点,是一类性能优越的新型储能器件用先进电极材料。在此,我们采用简便的水热法开发了掺杂 N 的还原氧化石墨烯(N-RGO)装饰 CoS2 纳米颗粒纳米杂化物(N-RGO/CoS2,简称 NGCS)。掺杂-N过程丰富了RGO纳米片的比表面积和孔隙率,不仅形成了丰富的网络纳米结构,有利于电荷/离子的快速传输,而且促进了CoS2更分散的锚定,从而形成了更小尺寸的CoS2纳米颗粒,可提供丰富的暴露电活性位点。因此,这种独特的分层多孔纳米结构有助于纳米混合体中的所有成分 "优势互补",从而使制造出的 NGCS 电极在 0.6 A g-1 电流条件下具有 797.1 F g-1 的高比电容和 77.5% 的卓越速率保持能力(20 A g-1)。此外,组装后的 NGCS//AC 混合超级电容器(HSC)具有 41.4 Wh kg-1 的出色能量密度(719.7 W kg-1)和长期循环能力,13,000 次循环后电容保持率为 86.02%,在新型高性能能量存储和转换设备中具有广阔的应用前景。
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来源期刊
Electrochimica Acta
Electrochimica Acta 工程技术-电化学
CiteScore
11.30
自引率
6.10%
发文量
1634
审稿时长
41 days
期刊介绍: Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.
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