|Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors|
|T. C. Chou; R. A. Doong; C. C. Hu; B. S. Zhang; D. S. Su
|Abstract||A promising energy storage material, MnO2/hierarchically porous carbon (HPC) nanocomposites, with exceptional electrochemical performance and ultrahigh energy density was developed for asymmetric supercapacitor applications. The microstructures of MnO2/HPC nanocomposites were characterized by transmission electron microscopy, scanning transmission electron microscopy, and electron dispersive X-ray elemental mapping analysis. The 3-5nm MnO2 nanocrystals at mass loadings of 7.3-10.8wt% are homogeneously distributed onto the HPCs, and the utilization efficiency of MnO2 on specific capacitance can be enhanced to 94-96%. By combining the ultrahigh utilization efficiency of MnO2 and the conductive and ion-transport advantages of HPCs, MnO2/HPC electrodes can achieve higher specific capacitance values (196Fg(-1)) than those of pure carbon electrodes (60.8Fg(-1)), and maintain their superior rate capability in neutral electrolyte solutions. The asymmetric supercapacitor consisting of a MnO2/HPC cathode and a HPC anode shows an excellent performance with energy and power densities of 15.3Whkg(-1) and 19.8kWkg(-1), respectively, at a cell voltage of 2V. Results obtained herein demonstrate the excellence of MnO2/HPC nanocomposites as energy storage material and open an avenue to fabricate the next generation supercapacitors with both high power and energy densities.|
; doong, ruey-an] natl tsing hua univ, dept biomed engn & environm sci, hsinchu 30013, taiwan. [hu, chi-chang] natl tsing hua univ, dept chem engn, hsinchu 30013, taiwan. [zhang, bingsen
; su, dang sheng] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.
; chou, tc (reprint author), natl tsing hua univ, dept biomed engn & environm sci, hsinchu 30013, taiwan.
T. C. Chou,R. A. Doong,C. C. Hu,et al. Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors[J]. Chemsuschem,2014,7(3):841-847.
T. C. Chou,R. A. Doong,C. C. Hu,B. S. Zhang,&D. S. Su.(2014).Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors.Chemsuschem,7(3),841-847.
T. C. Chou,et al."Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors".Chemsuschem 7.3(2014):841-847.
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