Enhancing the charge-storage performance of N-doped reduced graphene oxide aerogel supercapacitors by adsorption of the cationic electrolytes with single-stand deoxyribonucleic acid

摘要: Abstract Single-stand deoxyribonucleic acid/N-doped reduced graphene oxide aerogel (ssDNA/N-doped rGO) composites were synthesized and used as the electrode materials for supercapacitors. The mass change of electrolytes adsorbed on ssDNA/N-doped rGO during a charge/discharge process determined by an electrochemical quartz crystal microbalance (EQCM) at cathodic potential range (−0.5 to −0.1 V vs. Ag/AgCl) is 10-fold higher than that anodic (−0.1–0.3 V Ag/AgCl). This because ssDNA having negatively charged phosphate nitrogen-containing nucleobase groups prefers cationic to anionic ones. An as-fabricated supercapacitor with coin-cell size (CR2016) provides 644 F/g 0.5 A/g, which 1.3-fold N-doped device. specific power energy device are ca. 30 Wh/kg 4500 W/kg, respectively capacity retention 94.1% over 2500 cycles. Two cells connected in series can supply electricity red LED 10 min. composite this work may also be other applications where functional play important role adsorption electrolytes.