Tailoring Mo-Doped NiCoP Grown on (Ni,Co)Se₂ Nanoarrays for Asymmetric Supercapacitor with Enhanced Electrochemical Performance

Abstract

Both composition and nanostructure play vital roles in the electrochemical properties of the transition-metal compounds. Rational elemental doping and nanostructure design could accelerate the Faradaic redox reaction kinetics and increase the electroactive sites. Herein, we have successfully synthesized core−shell structure nanoarrays where (Ni,Co)Se 2 nanowires directly grow on activated carbon cloth as the conductive core to support an Mo-doped NiCoP nanosheet shell. This hierarchical nanoarray electrode exhibits a high areal capacity of 1.99 C/cm 2 at 2 mA/cm 2 (a gravimetric specific capacity of 797 C/g) and notable rate capability (1.54 C/cm 2 at 50 mA/cm 2 ). The asymmetric supercapacitor device assembled using (Ni,Co)Se 2 @Mo-NiCoP as the cathode and activated carbon as the anode exhibits a high energy density of 33.7 Wh/kg at a power density of 800 W/kg.

Unlocking the potential of a novel hierarchical hybrid (Ni–Co)Se2@NiMoO4@rGO–NF core–shell electrode for high-performance hybrid supercapacitors

“…The energy and power densities of the proposed HSC device were comparable and even higher than the values of previously reported transition metal chalcogenide-based supercapacitors. 42,68,[72][73][74][75] As a pivotal parameter in measuring its practical applicability, long-term cycling tests were performed on the NCSe@NMO@rGO-NF//OA_MOFs-PC-CNTs HSC device. Fig.…”

Multi-step electrodeposited Ni–Co–P@LDH nanocomposites for high-performance interdigital asymmetric micro-supercapacitors

“…35,36 The broad diffraction peaks in all three electrodes at 26.7°belong to the carbon cloth substrate (denoted as #CC). 37…”

“…35,36 The broad diffraction peaks in all three electrodes at 26.7°belong to the carbon cloth substrate (denoted as #CC). 37 XPS is employed to analyze the element composition and chemical state of the samples. The survey XPS spectra of the Ni-Co-P and Ni-Co-P@LDH electrodes are shown in Fig.…”

“…26 Furthermore, the existence of nanospheres can provide a more active surface area and allow the edges of the LDH nanosheets to be maximally exposed to the electrolyte, thus further enhancing the charge storage. 37 More details of Ni-Co-P@LDHs on the structure and their morphology are revealed by TEM and HRTEM. Fig.…”

Microwave heating followed by a solvothermal method to synthesize nickel–cobalt selenide/rGO for high-performance supercapacitors

“…3(c) displays the coexistence of Co 2+ and Co 3+ according to the peak energies sitting at 797.0 eV, 781.1 eV, and 778.6 eV, accompanied with two satellite peaks. 48 With regard to Se 3d spectrum in Fig. 3(d), the binding energies of 59.2 eV, 55.4 eV, and 54.5 eV belong to Se-O, Se 3d 3/2 , and Se 3d 5/2 , respectively, revealing the formation of Se-metal bonds in the as-synthesized (Ni 0.85 Se) 3 (Co 0.85 Se)/rGO.…”