Edge-carboxylated graphene nanoplatelets as efficient electrode materials for electrochemical supercapacitors
Edge-carboxylated graphene nanoplatelets as efficient electrode materials for electrochemical supercapacitors
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DOI：
10.1016/j.carbon.2018.10.011
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发表时间：
2019-02
期刊：
影响因子：
10.9
通讯作者：
Narayan Chandra Deb Nath;In‐Yup Jeon;M. Ju;S. Ansari;Jong‐Beom Baek;Jae‐Joon Lee
中科院分区：
文献类型：
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作者：
Narayan Chandra Deb Nath;In‐Yup Jeon;M. Ju;S. Ansari;Jong‐Beom Baek;Jae‐Joon Lee
Edge-carboxylated graphene nanoplatelets (ECG), prepared by a mechano-chemical reaction (or ball milling method) in the presence of dry ice, are eligible for an efficient electrode materials for electrochemical supercapacitors.ECGcontained a higher content of edge-carboxylic groups with less structural defects, compared with the nitrogen-doped carboxylic graphene (NGOOH) prepared from the conventional solution-exfoliation of graphite. The structural defects level ofECGisca. 16.2%, while it wasca. 48.9% forNGOOH. The edge-carboxylation increases the electroactive surface area, hydrophilicity and wettability of graphene without serious deterioration of the intrinsic propertiese.g., chemical, mechanical and electronic properties. In result, it is more effective in enabling ion adsorption and rapid electrolyte diffusion within the pores of graphene which results in a significant increase of specific capacitance (Csp) to 365.72 F/g at a current density of 1 A/g, with a good charge–discharge property and rate capability forECG.On the other hand, theCspsignificantly decreases toca.175.05 F/g forNGOOH, as its high level of structural defects seriously affected its electronic properties.
