三金属Mn-Ni-Co-O@Ni-Mn-S纳米针/纳米片核壳阵列用于超级电容器的研究

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摘要为满足超级电容器对于高性能电极材料的需求,本研究采用水热和电沉积结合的方法,在泡沫镍上合成了具有独特三维(3D)核壳结构的纳米针/纳米片核壳阵列(3D NDNSA)的过渡金属氧化物和硫化物复合赝电容电极材料Mn-Ni-Co-O@Ni-Mn-S(MNCO@NMS)。SEM和TEM分析结果表明,一维MNCO纳米针为核心和二维NMS纳米片为壳层,相互连接并交织形成分层的3D核壳纳米结构的MNCO@NMS。由于过渡金属氧化物和硫化物的协同作用和分层核壳结构带来的导电性和活性位点的增加,制得的3D MNCO@NMS表现出了优异的电化学性能。在3 mol·L^-1 KOH作为电解质的三电极电化学测试系统中,MNCO@NMS电极在电流密度1 A·g^-1下比电容为 2 574.2 F·g^-1;在电流密度 10 A·g^-1下循环5 000次后,表现出接近100%的库伦效率和83.4%的比电容保持率。此外,以制得的MNCO@NMS为正极,活性炭为负极组装的混合超级电容器器件(HSCs)在功率密度799 W·kg^-1下的能量密度为54.4 Wh·kg^-1,在 5 A·g^-1下进行4 000次循环后,库伦效率接近100%和保持初始比电容的81.7%。这些电化学特性表明,核壳MNCO@NMS可以成为超级电容器高性能电极的选择之一。

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关键词：核-壳结构 Mn-Ni-Co-O Ni-Mn-S纳米片超级电容器

Abstract： To meet the needs of supercapacitors for high-performance electrode materials, a combination of hydrothermal and electrodeposition methods was used to synthesize the transition metal oxide and sulfide composite pseudocapacitance electrode material Mn-Ni-Co-O@Ni-Mn-S (MNCO@NMS) with a unique three-dimensional (3D) core-shell structure nanoneedle/nanosheet core-shell array (3D NDNSA) on nickel foam. The SEM and TEM analysis showed that the one-dimensional MNCO nanoneedle as core and the two-dimensional NMS nanosheet as shell were well interconnected and intertwined to form hierarchical 3D core-shell MNCO@NMS nanostructure. Due to the synergistic effects of transition metal oxides and sulfides and the increased conductivity and active sites resulting from the 3D core-shell structure, the prepared 3D MNCO@NMS exhibited excellent electrochemical properties. In the 3 mol·L^-1 KOH three-electrode electrochemical testing system, the MNCO@NMS electrode processed an excellent capacitance of 2 574.2 F·g^-1 at the current density of 1 A·g^-1; After 5 000 cycles at a current density of 10 A·g^-1, it exhibited a Coulombic efficiency close to 100% and a specific capacitance retention rate of 83.4%. Furthermore, the hybrid supercapacitors (HSCs) with MNCO@NMS as the positive electrode and activated carbon as the negative electrode exhibited a high energy density of 54.4 Wh·kg^-1 at the power density of 799 W·kg^-1; Coulombic efficiency was close to 100% and maintained of 81.7% initial capacitance after 4 000 cycles at 5 A·g^-1. These electrochemical properties indicate that the prepared core-shell MNCO@NMS can be one of the choices for the high-performance electrode of supercapacitors.

Keywords： core-shell structure Mn-Ni-Co-O Ni-Mn-S nanosheets supercapacitors

Received 2022-01-05;

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Corresponding Authors: 蔡旺锋,副教授,E-mail:wfcai@tju.edu.cn。 Email: wfcai@tju.edu.cn

About author: 任建伟(1993-),男,硕士研究生,现从事过渡金属氧化物与硫化物用于超级电容器方面的研究。

引用本文:

任建伟, 王燕, 蔡旺锋.三金属Mn-Ni-Co-O@Ni-Mn-S纳米针/纳米片核壳阵列用于超级电容器的研究[J]. 化学工业与工程, 2022,39(5): 78-89

REN Jianwei, WANG Yan, CAI Wangfeng.Trimetallic Mn-Ni-Co-O@Ni-Mn-S core-shell nanoneedle/nanosheet arrays for supercapacitors[J]. Chemcial Industry and Engineering, 2022,39(5): 78-89

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