Li Xin-Sheng, Xu Man-Man, Yang Yang, Huang Quan-Bo, Wang Xiao-Ying, Ren Jun-Li, Wang Xiao-Hui
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
Materials (Basel). 2019 Jul 26;12(15):2379. doi: 10.3390/ma12152379.
Two corncob-derived carbon electrode materials mainly composed of micropores (activated carbon, AC) and mesopores/macropores (corncob carbon, CC) were prepared and studied after the anodic electrodeposition of MnO. The capacity of the MnO/activated carbon composite (MnO@AC) electrode did not noticeably increase after MnO electrodeposition, while that of the MnO/corncob carbon composite (MnO@CC) electrode increased up to 9 times reaching 4475 mF cm. An asymmetric all-solid-state supercapacitor (ASC) was fabricated using AC as the anode, MnO@CC as the cathode, and polyvinyl alcohol (PVA)/LiCl gel as the electrolyte. An ultrahigh specific capacitance of 3455.6 mF cm at 1 mA cm, a maximum energy density of 1.56 mW h cm, and a long lifetime of 10,000 cycles can be achieved. This work provides insights in understanding the function of MnO in biomass-derived electrode materials, and a green path to prepare an ASC from waste biomass with excellent electrochemical performance.
制备了两种主要由微孔（活性炭，AC）和中孔/大孔（玉米芯碳，CC）组成的玉米芯衍生碳电极材料，并在阳极电沉积MnO后进行了研究。MnO/活性炭复合材料（MnO@AC）电极在MnO电沉积后容量没有明显增加，而MnO/玉米芯碳复合材料（MnO@CC）电极的容量增加了9倍，达到4475 mF/cm²。以AC为阳极、MnO@CC为阴极、聚乙烯醇（PVA）/LiCl凝胶为电解质制备了一种非对称全固态超级电容器（ASC）。在1 mA/cm²时可实现3455.6 mF/cm²的超高比电容、1.56 mW h/cm²的最大能量密度和10000次循环的长寿命。这项工作为理解MnO在生物质衍生电极材料中的作用提供了见解，并为从具有优异电化学性能的废弃生物质制备ASC提供了一条绿色途径。
