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Boosting the performance of cobalt molybdate nanorods by introducing nanoflake-like cobalt boride to form a heterostructure for aqueous hybrid supercapacitors.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.jcis.2020.01.040
Jing-Feng Hou 1 , Jian-Fei Gao 1 , Ling-Bin Kong 2
Affiliation  

Binary transition metal oxides have received extensive attention because of their multiple oxidation states. However, due to the inherent vices of poor electronic/ionic conductivities, their practical performance as supercapacitor material is limited. Herein, a cobalt molybdate/cobalt boride (CoMoO4/Co-B) composite is constructed with cobalt boride nanoflake-like as a conductive additive in CoMoO4 nanorods using a facile water bath deposition process and liquid-phase reduction method. The effects of CoMoO4/Co-B mass ratios on its electrochemical performance are investigated. Remarkably, the CoMoO4/Co-B composite obtained at a mass ratio of 2:1 shows highly enhanced electrochemical performance relative to those obtained at other ratios and exhibits an optimum specific capacity of 436 F g-1 at 0.5 A g-1. This kind of composite could also display great rate capacity (294 F g-1 at 10 A g-1) and outstanding long cycle performance (90.5% capacitance retention over 10 000 cycles at 5 A g-1). Also, the asymmetric supercapacitor device is prepared by using CoMoO4/Co-B composite as the anode with the active carbon as the cathode. Such a device demonstrates an outstanding energy density of 23.18 Wh kg-1 and superior long-term stability with 100% initial specific capacity retained after 10,000 cycles. The superior electrochemical properties show that the CoMoO4/Co-B electrode material has tremendous potential in energy storage equipment applications.

中文翻译:

通过引入类似纳米片状的硼化钴形成水性混合超级电容器的异质结构,从而提高钼酸钴纳米棒的性能。

二元过渡金属氧化物由于其多种氧化态而受到广泛关注。然而,由于不良的电子/离子电导率的固有缺点,它们作为超级电容器材料的实际性能受到限制。在此,使用便捷的水浴沉积工艺和液相还原法,在CoMoO4纳米棒中以硼化钴纳米片状作为导电添加剂构造了钼酸钴/硼化钴(CoMoO4 / Co-B)复合材料。研究了CoMoO4 / Co-B质量比对其电化学性能的影响。值得注意的是,相对于以其他比例获得的CoMoO4 / Co-B复合物,其质量比为2:1,其电化学性能大大增强,在0.5 A g-1的条件下显示出436 F g-1的最佳比容量。这种复合材料还可以显示出较高的倍率容量(在10 A g-1时为294 F g-1)和出色的长循环性能(在5 A g-1的10000次循环中具有90.5%的电容保持率)。此外,通过使用CoMoO4 / Co-B复合材料作为阳极,而活性炭作为阴极,制备不对称超级电容器。这种设备显示出23.18 Wh kg-1的出色能量密度和出色的长期稳定性,在10,000次循环后保留了100%的初始比容量。优异的电化学性能表明,CoMoO4 / Co-B电极材料在储能设备应用中具有巨大潜力。以CoMoO4 / Co-B复合材料为阳极,活性炭为阴极,制备了不对称超级电容器。这种设备显示出23.18 Wh kg-1的出色能量密度和出色的长期稳定性,在10,000次循环后保留了100%的初始比容量。优异的电化学性能表明,CoMoO4 / Co-B电极材料在储能设备应用中具有巨大潜力。以CoMoO4 / Co-B复合材料为阳极,活性炭为阴极,制备了不对称超级电容器。这种设备显示出出色的能量密度23.18 Wh kg-1和出色的长期稳定性,在10,000次循环后保留了100%的初始比容量。优异的电化学性能表明,CoMoO4 / Co-B电极材料在储能设备应用中具有巨大潜力。
更新日期:2020-01-17
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