Fullerene C₇₆: An Unexplored Superior Electrode Material with Wide Operating Potential Window for High‐Performance Supercapacitors

Abstract

Carbon materials have widely been used to enhance the performance of a plethora of supercapacitor electrode materials. In this regard, it is crucial to identify carbon materials that function over a wide pH range while enjoying a wide potential window. Herein, the DFT calculations were used to elucidate the electronic performance of C 76 and the C 76 /electrolyte interface. The electronic investigation revealed the nature of the conductivity and charge storage mechanism of C 76 based on the bandgap and quantum capacitance calculations. Also, the electrochemical and electronic properties of fullerene C 76 have been extensively investigated over a wide pH range; acidic H 2 SO 4 , basic KOH, and neutral Na 2 SO 4 . The results showed a promising performance in the three electrolytes. Moreover, C 76 electrodes exhibited a potential window of 1.9 V in Na 2 SO 4 electrolyte, resulting in capacitances of 171 F/g and 142 F/g at a scan rate of 1 mV/s in the positive and negative potential windows, respectively. The material showed a pseudocapacitance performance of 65 % in Na 2 SO 4 electrolyte in the positive potential window. We believe higher fullerenes provide a new class of materials for developing versatile supercapacitor devices for efficient energy storage.Laboratory is highly appreciated. We also acknowledge Bibliotheca Alexandrina HPC for allowing us to use the HPC resources.

Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window

“…All CVs showed a quasi‐rectangular shape, indicating pseudocapacitive performance. The GCDs in Figure b,c shows a semi‐rectangular shape as well proving the pseudocapacitive behavior The estimated capacitance from the CV graph is 1.14 mF/cm 2 at 5 mV/s with an excellent rate capability up to 50 mV/s as illustrated in Figure d, revealing the stability of the material as it retained more than 90% of its capacitance at 50 mV/s. The electrochemical stability of the H 2 ‐annealed Ti−Mo−Ni−O nanotubes electrode was further examined by conducting long run charge‐discharge cycles (about 3700 cycles) at a charge discharge current density of 1 mA/cm 2 as illustrated in Figure e.…”

Trends on the Development of Hybrid Supercapacitor Electrodes from the Combination of Graphene and Polyaniline

“…The combination of fullerene and PANI has also been reported to produce SC electrodes with high specific capacitances. [72][73][74] For instance, outstanding SCs with a specific capacitance of 2201 F/g (at a current density of 2 A/g) have been reported by Ramadan et al by integrating fullerene with PANI. 73 The hybrid electrode also exhibits superior cycling stability up to 1,000 cycles while maintaining the capacity retention at 96%.…”

Unveiling the role of carbon defects in the exceptional narrowing of m-ZrO2 wide-bandgap for enhanced photoelectrochemical water splitting

“…Although carbon-doped zirconia was briefly investigated in the literature [53][54][55] the debatable effect of carbon doping in zirconia was neither treated nor unriddled systematically and comprehensively for water splitting applications. The first-principles calculations proved to be credible and efficient in diverse applications [56][57][58][59][60][61][62][63][64] . Therefore, Herein, an in-depth first-principles study was conducted to encompass the viable scenarios for doping monoclinic zirconia with carbon and to scrutinize the effect of carbon doping on its performance metrics as a photoelectrode for water splitting.…”