Iron and Nickel Mixed Oxides Derived From NiIIFeII-PBA for Oxygen Evolution Electrocatalysis

Abstract

The sluggish kinetics of oxygen evolution reaction (OER) on anode hinders the efficiency of electrochemical water splitting. Electrocatalysts for OER based on non-precious transition metals are highly desirable. Herein, iron and nickel mixed oxides with surface oxygen vacancies were fabricated using Ni II Fe II -Prussian blue analog as the precursors by a facile two-step thermal-assisted method. The precursor compositions and calcination temperatures exert great impact on the structure and morphology of the derivatives, as well as the electrocatalytic performances for OER. Both the higher content of Ni ions during the synthesis of precursors and lower calcination temperature favor the electrocatalytic performance of the corresponding derivatives. The porous metal oxides consisting of nickel oxide and nickel ferrite exhibited the remarkable electrocatalytic property toward OER in an alkaline solution, which can be attributed to the nanosized and porous structure, the co-existence of spinel NiFe 2 O 4 and cubic NiO, the high content of surface oxygen vacancies, and the low charge transfer resistance. This study will provide new inspiration for the facile design of low-cost active catalysts for OER in the future.

High Electrochemical Performance of Bi2WO6/Carbon Nano-Onion Composites as Electrode Materials for Pseudocapacitors

“…Supercapacitors are classified into two types, pseudocapacitors and electric double-layer capacitors (EDLC), according to the energy storage mechanism. The success of EDLC is due to the charge being accumulated on the electrode under the function of a physical electric field, which can achieve the aim of separation of charges from the electrode–electrolyte interface, and the capacitance of EDLC using carbon materials as the electrode gives a higher specific capacitance compared with other materials (Xie et al, 2019 ). However, the specific capacitance has not yet met the requirement for application.…”

Realizing electrochemical transformation of a metal–organic framework precatalyst into a metal hydroxide–oxy(hydroxide) active catalyst during alkaline water oxidation

“…2,6,[20][21][22][23][24][25][26][27][28][29][30][31][32][33] In this respect, transition metal-based MOF-derived hydroxides, oxides, phosphides, chalcogenides, etc., have been demonstrated with promising electrochemical water oxidation activity. [34][35][36][37][38][39][40][41][42][43][44][45] Comprising a large electrochemical surface area, exposed facets, an increased number of active sites, and tunable electronic properties, MOFderived catalysts have attained special attention for electrochemical processes. For example, NiCo-PBA derived Ni x Co 3Àx O 4 demonstrated 10 mA cm À2 current density for the OER at only 287 mV overpotential.…”

Facile Synthesis of Carbon Cloth Supported Cobalt Carbonate Hydroxide Hydrate Nanoarrays for Highly Efficient Oxygen Evolution Reaction

“…To facilitate the OER, the noble metal-based materials like IrO 2 and RuO 2 have been regarded as highly active catalysts for the OER. (Xie et al, 2019;Du et al, 2021;Wang et al, 2021). Although they present outstanding activity for the OER, the high cost, scarcity reserves and poor stability are main reasons to limit their practical applications.…”