Non‐Noble‐Metal‐Based Electrocatalysts toward the Oxygen Evolution Reaction

Abstract

The development of low-cost, high-efficiency, and robust electrocatalysts for the oxygen evolution reaction (OER) is urgently needed to address the energy crisis. In recent years, non-noble-metal-based OER electrocatalysts have attracted tremendous research attention. Beginning with the introduction of some evaluation criteria for the OER, the current OER electrocatalysts are reviewed, with the classification of metals/alloys, oxides, hydroxides, chalcogenides, phosphides, phosphates/borates, and other compounds, along with their advantages and shortcomings. The current knowledge of the reaction mechanisms and practical applications of the OER is also summarized for developing more efficient OER electrocatalysts. Finally, the current states, challenges, and some perspectives for non-noble-metal-based OER electrocatalysts are discussed.

Nitrogen‐Doped Cobalt Pyrite Yolk–Shell Hollow Spheres for Long‐Life Rechargeable Zn–Air Batteries

“…[38] To understand the promotion of the yolk-shell structure and nitrogen doping on the oxygen electrocatalysis performance, the electrochemically active surface area is evaluated through the electrochemical double-layer capacitance by measuring the cyclic voltammetry (CV) curves at different scan rates ( Figure S12, Supporting Information). [39,40] As shown in Figure 4g, the N-CoS 2 YSSs show a much higher value (209.8 mF cm −2 ) than that of CoS 2 SSs (108.5 mF cm −2 ), in line with the BET results, indicating more active sites are exposed in the former. In addition, the electrochemical impedance spectroscopy fitted by an equivalent electrical circuit ( Figure S13, Supporting Information) is also used to evaluate the charge transfer kinetics.…”

One-step conversion of tannic acid-modified ZIF-67 into oxygen defect hollow Co3O4/nitrogen-doped carbon for efficient electrocatalytic oxygen evolution

“…Stability is another important factor in evaluating catalysts in practical applications. 5,47 As shown in Fig. 5d, the durability of O V -HCo 3 O 4 @NC and A-ZIF-67 was tested at a current density of 10 mA cm À2 for 10 h. O V -HCo 3 -O 4 @NC exhibited a lower stable potential (1.61 V vs. RHE) than A-ZIF-67 (1.71 V vs. RHE), demonstrating the better long-term stability of the O V -HCo 3 O 4 @NC catalyst.…”

“…To date, non-precious metal electrocatalysts, including transition-metal phosphides, hydroxides, oxides, suldes, and nitrides, have been developed for the OER. [5][6][7][8] Among the above materials, Co 3 O 4 has been considered as a promising electrocatalyst due to its high abundance, low cost, and electrochemical stability. 9,10 Nevertheless, the electrochemical activity is limited due to its poor conductivity and severe nanoparticle aggregation during the OER process.…”

Electrocatalysts Based on Transition Metal Borides and Borates for the Oxygen Evolution Reaction

“…[15] Therefore, it is necessary to design earth-abundant metal-based OER catalysts with high efficiency,r easonable catalytic activity,a nd long-termd urability.Alarge amount of research has been made toward developing such catalysts from earth-abundant transition metals for OER over the past few years. [16,17] Various non-precious transition metal-based materials, such as transition metalo xides, [18] hydro(oxy)oxides, [19] sulfides, [20] borides, [21] borates, [22] selenides, [23] nitrides, [24] carbides, [25] phosphides, [26] phosphates, etc., [27][28][29] for OER have been explored for decades.…”