Unveiling the redox electrochemistry of 1D, urchin-like vanadium sulfide electrodes for high-performance hybrid supercapacitors

Formulation of Hierarchical Nanowire-Structured CoNiO2 and MoS2/CoNiO2 Hybrid Composite Electrodes for Supercapacitor Applications

“…The observed results suggested that, primarily, the assembled device realized low Coulombic efficiency (Figure S11b), whereas it achieved about 99% Coulombic efficiency in the ensuing sequences. These characteristics are credited to the enhanced absorption of electrolytic ions and the wettability of assembled devices for continuous cycling performance …”

“…Electrochemical capacitors (ECs), often referred to as ultra-or supercapacitors, have gained prominence in energy storage/ conversion devices in recent times owing to their many advantages, including safety, fast charge/discharge characteristics, higher power density, longer lifecycle, and minimal fabrication/maintenance charge. 1,2 In recent years, numerous research groups have proved that transition metal oxides (TMOs) are considered as likely alternative electrode materials for the oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and ECs/batteries applications. 3,4 Among the series of M−M1 (M, M1 = Co, Ni, Cu, Mo, Fe, and Ni) binary alloys, Co−Ni-based ones have been widely established with attractive electrochemical properties due to the synergistic interactions of Co and Ni, improving the electrical conductivity and boosting the redox reactions in SCs.…”

“…Electrochemical capacitors (ECs), often referred to as ultra- or supercapacitors, have gained prominence in energy storage/conversion devices in recent times owing to their many advantages, including safety, fast charge/discharge characteristics, higher power density, longer lifecycle, and minimal fabrication/maintenance charge. , In recent years, numerous research groups have proved that transition metal oxides (TMOs) are considered as likely alternative electrode materials for the oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and ECs/batteries applications. , Among the series of M–M1 (M, M1 = Co, Ni, Cu, Mo, Fe, and Ni) binary alloys, Co–Ni-based ones have been widely established with attractive electrochemical properties due to the synergistic interactions of Co and Ni, improving the electrical conductivity and boosting the redox reactions in SCs. , CoNiO 2 attracts much attention due to its strong redox activity because of the coexistence of the Ni and Co species, natural abundance, friendly environment, high theoretical capacitance, and sample preparation. , Several strategies/approaches were utilized to design/prepare some electrocatalysts with unique morphology structures and active sites, including various forms of nanoparticles such as cubes, sheets, wires, tubes, and flakes, to generate the active sites, resulting in improving the electrochemical performances. , For the rock salt (NaCl)-type NiCoO 2 crystal structure, both Ni 2+ and Co 2+ coexist in any molar ratio in the crystal structure. These ions are sited in the octahedral voids within the face-centered cubic (FCC) arrangement of oxide ions (O 2– ) .…”

Designing CoS2-Mo2C and CoS2-W2C hybrids for high-performance supercapacitors and hydrogen evolution reactions

“…The obtained GCD curves revealed a nonlinear profile characterized at various current densities by discernible potential peaks. The observed GCD results were used to estimate Q sp using the following estimation route: 46,47 here, represents the integral of the applied potential over the discharge span in the GCD profile. The variables V , w , i , and t correspond to the applied potential, electrode material mass, applied current, and discharge span, respectively.…”

“…S5c † show that a battery- The obtained GCD curves revealed a nonlinear profile characterized at various current densities by discernible potential peaks. The observed GCD results were used to estimate Q sp using the following estimation route: 46,47…”