Open AccessRedox Molecule Adsorbed Graphene Films with Compact Structure for Electrochemical Energy Storage
Author(s) -
Yucan Zhu,
Xingke Ye,
Hedong Jiang,
Chunyang Jia
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/714/3/032003
Subject(s) - pseudocapacitance , graphene , capacitance , materials science , adsorption , supercapacitor , oxide , electrode , chemical engineering , electrochemistry , current density , fabrication , energy storage , nanotechnology , molecule , hydroquinone , chemistry , organic chemistry , medicine , power (physics) , physics , alternative medicine , quantum mechanics , pathology , engineering , metallurgy
Graphene films with compact structure and high ion accessible surface are essential to achieve dense energy storage with high-performance. Thus we prepared hydroquinone (HQ) adsorbed reduced graphene oxide (HQ-rGO) films with high packing density by capillary pressure. Hence, sulphuric acid was pre-intercalated between graphene sheets to reduce ion transport resistance, and adsorbed HQ molecules provide abundant pseudocapacitance. Finally, the two materials play a synergistic effect, significantly improving the capacitance performance. The resulting HQ-rGO films exhibit high volumetric capacitance of ~189.4F cm −3 at 1mA cm −2 , and after current density increase to 30mA cm −2 , its capacitance retention can achieve 54% of original value, which demonstrates excellent rate performance of the device. Clearly, this strategy is great promising for fabrication of electrode material with high performance.