Electrospun Carbon Nanofibers Encapsulated with NiCoP: A Multifunctional Electrode for Supercapattery and Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution Reactions

Abstract

Functionalizing nanostructured carbon nanofibers (CNFs) with bimetallic phosphides enables the material to become an active electrode for multifunctional applications. A facile electrospinning technique is utilized for the first time to develop NiCoP nanoparticles encapsulated CNFs that are used as an energy storage system of supercapattery, and as an electrocatalyst for oxygen reduction, oxygen evolution, and hydrogen evolution reaction in KOH electrolyte. Evolving from the inclusion of bimetallic phosphide nanoparticles, the NiCoP/CNF electrode unveils superior‐specific capacitance (333 Fg−1 at 2 Ag−1) and rate capability (87%). The fabricated supercapattery device offers a voltage of 1.6 V that supplies a remarkable energy density (36 Wh kg−1) along with an improved power density (4000 W kg−1) and unwavering cyclic stability (25 000 cycles). Meanwhile, the NiCoP/CNF electrode has simultaneously performed well as a multifunctional electrocatalyst for oxygen reduction reaction at a half‐wave potential of 0.82 V versus reversible hydrogen electrode and can attain a current density of 10 mA cm−2 at a very low overpotential of 268 and 130 mV for the oxygen evolution reaction and hydrogen evolution reaction, respectively. Thus, the NiCoP/CNF with all its inimitable electrode properties has profoundly proved its proficiency at handling multifunctional challenges in terms of both storage and conversion.

Laser‐Ablation‐Produced Cobalt Nickel Phosphate with High‐Valence Nickel Ions as an Active Catalyst for the Oxygen Evolution Reaction

“…In the P2ps pectrum, P2p 1/2 and P2p 3/2 of P dÀ in PÀMo fC oNi 2 Pa re found at 130.5 and 129.6 eV ( Figure 2c). [30,31] All the results prove that the precursor is phosphide. Thee mergence of the P 5 + peak (134 eV) in the P2ps pectrum of CoNi 2 Pi sa ttributed to its surfaceo xidation to phosphate during the storage.…”

“…As shown in the Ni 2p spectrum (Figure 2a), CoNi 2 Pe xhibits an obvious peak of the NiÀPb ond (853.7 eV) as well as peaks of Ni 2 + (856.5 eV) and its satellite( 862.5 eV). [30] Similarly,t he peaks of the CoÀPb ond (778.8 eV), Co 2 + (782.3 eV) and satellite (788 eV) are found in the Co 2p spectrum ( Figure 2b). In the P2ps pectrum, P2p 1/2 and P2p 3/2 of P dÀ in PÀMo fC oNi 2 Pa re found at 130.5 and 129.6 eV ( Figure 2c).…”

“…Similarly, the peaks of the Co−P bond (778.8 eV), Co 2+ (782.3 eV) and satellite (788 eV) are found in the Co 2p spectrum (Figure b). In the P 2p spectrum, P 2p 1/2 and P 2p 3/2 of P δ− in P−M of CoNi 2 P are found at 130.5 and 129.6 eV (Figure c) . All the results prove that the precursor is phosphide.…”

“…The conversion from phosphide to phosphate was monitored by X‐ray photoelectron spectroscopy (XPS). As shown in the Ni 2p spectrum (Figure a), CoNi 2 P exhibits an obvious peak of the Ni−P bond (853.7 eV) as well as peaks of Ni 2+ (856.5 eV) and its satellite (862.5 eV) . Similarly, the peaks of the Co−P bond (778.8 eV), Co 2+ (782.3 eV) and satellite (788 eV) are found in the Co 2p spectrum (Figure b).…”

Engineering the Interface of Carbon Electrocatalysts at the Triple Point for Enhanced Oxygen Reduction Reaction

“…The oxygen reduction reaction (ORR) is ac ritical reaction involved in the energy conversion process in af uel cell. [5] Additionally,P t-based cathode materials sustain the issues of deactivation andp oor stabilityd ue to a varietyo ff actors (dissolution,s intering,r ipening, leaching, etc.). [3] Therefore, the development of efficient electrocatalysts to efficientlyc atalyse the oxygen reduction reaction is crucial.T od ate, numerous efforts and breakthroughs have been made to develop noble metals, especially Pt-based electrocatalysts and alloys due to their high catalytic efficiency.…”