TY - JOUR
T1 - Edge-carboxylated graphene nanoplatelets as efficient electrode materials for electrochemical supercapacitors
AU - Deb Nath, Narayan Chandra
AU - Jeon, In Yup
AU - Ju, Myung Jong
AU - Ansari, Sajid Ali
AU - Baek, Jong Beom
AU - Lee, Jae Joon
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/2
Y1 - 2019/2
N2 - 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. ECG contained 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 of ECG is ca. 16.2%, while it was ca. 48.9% for NGOOH. The edge-carboxylation increases the electroactive surface area, hydrophilicity and wettability of graphene without serious deterioration of the intrinsic properties e.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 for ECG. On the other hand, the Csp significantly decreases to ca. 175.05 F/g for NGOOH, as its high level of structural defects seriously affected its electronic properties.
AB - 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. ECG contained 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 of ECG is ca. 16.2%, while it was ca. 48.9% for NGOOH. The edge-carboxylation increases the electroactive surface area, hydrophilicity and wettability of graphene without serious deterioration of the intrinsic properties e.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 for ECG. On the other hand, the Csp significantly decreases to ca. 175.05 F/g for NGOOH, as its high level of structural defects seriously affected its electronic properties.
KW - Edge-carboxylation
KW - Edge-functionalized graphene nanoplatelets
KW - Electrochemical supercapacitors
KW - Specific capacitance
KW - Structural defects
UR - http://www.scopus.com/inward/record.url?scp=85055961307&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2018.10.011
DO - 10.1016/j.carbon.2018.10.011
M3 - Article
AN - SCOPUS:85055961307
SN - 0008-6223
VL - 142
SP - 89
EP - 98
JO - Carbon
JF - Carbon
ER -