Fabrication of heteroatom doped cobalt catalyst for oxygen reduction and evolution reactions in alkaline medium

Abstract

The application of heteroatom doped cobalt (Ni@Co/C) prepared from a porous metal–organic framework as the cathode material for the rechargeable zinc–air batteries has been demonstrated. The Ni@Co/C‐modified electrode showed an excellent catalytic activity toward oxidation–reduction reaction and oxygen evolution reactions. The Co/C catalysts, which were Co particle impregnated on graphitic carbon powders, were synthesized after the calcination of Co3 (SDA)3(DMF)2 precursor, and then Ni deposition (Ni@Co/C) was followed on it by chemical reduction. Linear sweep voltammetry measurement indicates that Ni@Co/C‐H800, which had Ni particles on Co/C derived from MOF at 800 °C under N2, exhibited excellent performance. The stable charging/discharging profiles at 20 mA cm−2 of current were obtained for the 350 h in alkaline medium, suggesting Ni@Co/C‐H800 as a potential candidate for oxidation–reduction and evolution reactions.

Co(O)4(N)‐type single‐atom‐based catalysts and ligand‐driven modulation of electrocatalytic properties for reducing oxygen molecules

“…Despite of numerous reports achieving uniformly dispersed active sites and excellent electrocatalytic activities, understanding the catalytic behaviors associated with electronic and steric environments around active sites will accelerate their practical applications. Furthermore, development of cost‐effective low‐temperature process to produce M‐N‐C catalysts is required 2,12–16 . Although Fe‐containing electrocatalysts perform excellently, the detachment of Fe‐based species from catalyst electrodes can be a severe problem for their practical application.…”

“…Furthermore, development of cost-effective low-temperature process to produce M-N-C catalysts is required. 2,[12][13][14][15][16] Although Fecontaining electrocatalysts perform excellently, the detachment of Fe-based species from catalyst electrodes can be a severe problem for their practical application. Ionomers produced by Fe species via the Fenton reaction can degrade membranes in proton-exchange membrane fuel cells.…”

Optimization of oxygen evolution electrocatalytic activity of metal oxide nanosheet via surface modification

“…High-performance oxygen evolution electrocatalysts have garnered growing interest because of their pivotal functions in many renewable energy production and storage devices such as water electrolyzers and metal-O 2 batteries. [1][2][3][4][5] The sluggish kinetics of water oxidation originating from the transfer of four electrons is a major obstacle to the development of efficient electrocatalysts for the oxygen evolution reaction (OER). 6,7 Thus, only a few materials, such as noble metal oxides (IrO 2 and RuO 2 ), deliver excellent electrocatalyst performance for the OER.…”

One pot production of Co core/carbon shell materials and their electrocatalytic properties

“…Among the suggested alternatives, electrochemical energy conversion systems like fuel cells and metal-air batteries have emerged as promising options. 1 These systems rely on efficient electrocatalysts to facilitate the reduction of oxygen molecules to water at a cathode. 2 The oxygen reduction reaction (ORR) is a slow process due to its requirement of transferring four electrons.…”

“…This is primarily due to the limited global reservoirs of oil and the environmental pollution caused by the use of fossil fuels. Among the suggested alternatives, electrochemical energy conversion systems like fuel cells and metal‐air batteries have emerged as promising options 1 . These systems rely on efficient electrocatalysts to facilitate the reduction of oxygen molecules to water at a cathode 2 .…”