Well-defined hierarchical teddy bear sunflower-like NiCo₂O₄electrocatalyst for superior water oxidation

Abstract

The development of a robust and efficient electrocatalyst for water oxidation is challenging due to the large overpotential requirement to transfer four electrons. Herein, a novel spinel-type hierarchical teddy bear...

Self-Composition of Hierarchical Core–Shell-Structured NiCo2O4@NiCo2O4 Microspheres with Oxygen Vacancies for Efficient Oxygen Evolution Electrocatalysis

“…Up to now, numerous methodologies have been explored to synthesize NiCo 2 O 4 for achieving excellent OER performance. These investigations underline the pivotal roles of morphology, elemental composition, and surface defects in optimizing the OER activity of NiCo 2 O 4 . − Generally, catalysts embracing core–shell nanostructures frequently exhibit excellent OER performance, attributed to their extensive specific surface area and abundant presentation of active sites. Additionally, the core-guided electron effects can potentially expedite the electron transfer process. − To illustrate, Kim’s group designed a three-dimensional (3D) core–shell nanomaterial (Co–Fe–Bi/NiCo 2 O 4 /NF), exhibiting a mere 227 mV overpotential at 10 mA/cm 2 , rapid kinetics, and sustained OER durability .…”

One-dimensional nickel–cobalt bimetallic phosphide nanostructures for the oxygen evolution reaction

“…Additionally, the synergistic effect between phosphorus (P) and isocyanate enhanced the OER properties of NiCoP nanobers, while the formation of P-M bonds effectively inhibited P degradation, greatly improving the catalyst stability toward the OER. [19][20][21][22] The proposed one-dimensional structure also facilitated the adsorption of numerous compounds. 22 The unique ber network structure allowed electrospinning to signicantly enhance stabilization and increase the interfacial area between the catalytic electrode and the electrolyte, making it an ideal technique for catalysis.…”

“…Additionally, the synergistic effect between phosphorus (P) and isocyanate enhanced the OER properties of NiCoP nanofibers, while the formation of P–M bonds effectively inhibited P degradation, greatly improving the catalyst stability toward the OER. 19–22…”

Revealing the Electro-oxidation Mechanism of 5-Aminotetrazole on Nickel-Based Oxides and Synthesizing 5,5′-Azotetrazolate Salts

“…Two satellite peaks corresponding to Co 2+ and Co 3+ are observed, which indicates the successful introduction of the Co element 33. The O 1s spectra of Ni 2 CoO 4 /CC and NiO/CC are deconvoluted into three peaks that can be associated with metal−oxygen bonds, hydroxyl groups, and chemisorbed water, respectively, in Figure2i 29,34. OERand 5-AT Electro-oxidation on Ni 3−x CoO 4 /CC (x = 1, 2) Electrodes.…”