Wang Guiling, Liu Zihao, Ma Chenchao, Du Zhiling, Liu Dongyan, Cheng Kun, Ye Xiangju, Liu Tingting, Bai Lei
College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu 233030, China.
School of Energy and Environmental, Hebei University of Engineering, Handan 056038, China.
Nanomaterials (Basel). 2022 May 2;12(9):1538. doi: 10.3390/nano12091538.
Manganese oxides, as a type of two-dimensional (2D) material with high specific area and low cost, are considered promising energy storage materials. Here, we report novel AgMnO/NaMnO nanosheets created by a popular liquid precipitation method with different AgNO contents, and their corresponding physical and electrochemical characterizations are performed. The results show that the ultra-thin NaMnO nanosheets were combined with the AgMnO nanoparticles and an enhancement in their specific capacity was observed compared to the pristine sheets. This electrode material displays a peak specific capacitance of 335.94 F g at 1 A g. Using an asymmetric supercapacitor (ASC) assembled using a positive electrode made of AgMnO/NaMnO nanosheets and a reduced graphene oxide (rGO) negative electrode, a high energy density of 65.5 Wh kg was achieved for a power density of 775 W kg. The ASC showed good cycling stability with a capacitance value maintained at 90.2% after 10,000 charge/discharge cycles. The excellent electrochemical performance of the device was ascribed to the heterostructures and the open space formed by the interconnected manganese oxide nanosheets, which resulted in a rapid and reversible faraday reaction in the interface and further enhanced its electrochemical kinetics.
氧化锰作为一种具有高比表面积和低成本的二维材料，被认为是很有前景的储能材料。在此，我们报道了通过一种常用的液相沉淀法制备的不同AgNO含量的新型AgMnO/NaMnO纳米片，并对其进行了相应的物理和电化学表征。结果表明，超薄的NaMnO纳米片与AgMnO纳米颗粒相结合，与原始片相比，其比容量有所提高。这种电极材料在1 A g时的比电容峰值为335.94 F g。使用由AgMnO/NaMnO纳米片制成的正极和还原氧化石墨烯（rGO）负极组装的不对称超级电容器（ASC），在功率密度为775 W kg时实现了65.5 Wh kg的高能量密度。该ASC显示出良好的循环稳定性，在10000次充放电循环后电容值保持在90.2%。该器件优异的电化学性能归因于异质结构以及相互连接的氧化锰纳米片形成的开放空间，这导致界面处快速且可逆的法拉第反应，并进一步增强了其电化学动力学。
