Multifunctional Electrocatalysis on a Porous N-Doped NiCo₂O₄@C Nanonetwork

Abstract

Developing a multifunctional electrocatalyst with eminent activity, strong durability, and cheapness for the hydrogen/oxygen evolution reaction (HER/OER) and oxygen reduction reaction (ORR) is critical to overall water splitting and regenerative fuel cells. Herein, a nitrogen-doped nanonetwork assembled by porous and defective NiCo2O4@C nanowires grown on nickel foam (N-NiCo2O4@C@NF) is crafted via biomimetic mineralization and following carbonization of phase-transited lysozyme (PTL)-coupled NiCo2O4. The as-obtained N-NiCo2O4@C@NF electrocatalysts exhibit an exceptional catalytic activity with ultralow overpotentials for the HER (42 mV) and OER (242 mV) to afford 10 mA cm–2 while maintaining good stability in alkaline media. Meanwhile, the N-NiCo2O4@C electrocatalysts presents a superior catalytic activity for ORR and a favorable four-electron pathway. The unprecedented catalytic performance arises from a highly porous structure and abundant defects and synergistic effects of components. This work may offer a new possibility in the exploration of multifunctional electrocatalysts for various energy-related electrocatalytic reactions.

NiCo2O4 Nano-/Microstructures as High-Performance Biosensors: A Review

“…Many transition metals, rare earth metals, non-metaldoped NiCo 2 O 4 , and conjugated polymer-modified NiCo 2 O 4 materials have been reported in the literature with versatile applications. N-and P-doped NiCo 2 O 4 with oxygen vacancies have been explored for electrochemical performance for supercapacitors, electro-catalyst for O 2 and H 2 evolution reaction [15][16][17][18], and anodic material for lithium-ion batteries [19]. Lin et al [20] explored S-doped NiCo 2 O 4 nanosheet arrays as the efficient and bifunctional electrode for overall water-splitting reactions.…”

Hierarchical Cu(OH)2@Co(OH)2 Nanotrees for Water Oxidation Electrolysis

“…The corresponding EIS results and their parameters errors are also displayed in Table S2. [28][29][30][31][32] The R ct of Cu (OH) 2 @Co(OH) 2 (4.6 Ω) is smaller than that of Cu(OH) 2 (9.7 Ω), suggesting the smaller charge-diffusion resistance of Cu (OH) 2 @Co(OH) 2 at the interface, and thus resulting in the faster charge diffusion kinetics and higher reaction rates. Combining with overpotential and Tafel results, it reveals that the OER activity of Cu(OH) 2 nanowires are remarkably improved by the electrodeposition of Co(OH) 2 nanoflakes.…”

Binder‐Free Air Electrodes for Rechargeable Zinc‐Air Batteries: Recent Progress and Future Perspectives

“…Various kinds of metal foam‐supported active materials as air electrodes through different techniques, including electrochemical deposition, hydrothermal/solvothermal, chemical bath deposition, etc., have been reported. [ 145,159,163–168 ]…”