MnxCo3-xO4 spinel oxides as efficient oxygen evolution reaction catalysts in alkaline media

“…The OER activity of Co and Mn has been reported for bimetallic oxides. [39,41,45,46] Thus, the study of both metal structural positions is necessary for a better understanding of the changes observed over cycling. [49] XAS experiments were performed to investigate irreversible structural changes in the catalyst due to cyclic voltammetry.…”

Section: Resultsmentioning

confidence: 99%

“…[44] The activity was also enhanced by adding Mn in some reports, e.g., the introduction of 25 % of Mn into the Co3O4 spinel structure showed an overpotential decrease from 368 mV to 345 mV (at a current density, j, of 10 mA cm -2 ). [39] Menezes and collaborators [41] compared the current stability of the spinels CoMn2O4 and Co2MnO4. The current of both catalysts remained mostly constant after 30000 s, yet Co2MnO4 (containing more Co than Mn) showed a higher catalytic current.…”

Section: Introductionmentioning

confidence: 99%

“…[38] The introduction of a second transition metal into the Co-based oxides alters the electronic structure and potentially also modifies the atomic rearrangement, affecting catalysis and corrosion resistance. [39][40][41][42] Introducing Mn as a second metal has enhanced stability of perovskite-like oxides [43] and electrodeposited mixed metal oxides, [44] which has been attributed to separation of the structural framework from the catalytically active site(s). [44] The activity was also enhanced by adding Mn in some reports, e.g., the introduction of 25 % of Mn into the Co3O4 spinel structure showed an overpotential decrease from 368 mV to 345 mV (at a current density, j, of 10 mA cm -2 ).…”

Section: Introductionmentioning

confidence: 99%

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Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

Villalobos

Morales

Antipin

et al. 2022

Preprint

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Improving the stability of electrocatalysts for the oxygen evolution reaction (OER) through materials design has received less attention than improving their catalytic activity. We explored the effect of Mn addition to a cobalt oxide for stabilizing the catalyst by comparing Na-containing CoOx and (Co0.7Mn0.3)Ox films electrodeposited in alkaline solution. The obtained disordered films were classified as layered oxides using X-ray absorption spectroscopy (XAS). The CoOx films showed a constant decrease in the catalytic activity during cycling, confirmed by oxygen detection, while that of (Co0.7Mn0.3)Ox slightly increased as measured by electrochemical metrics. These trends were rationalized based on XAS analysis of the metal oxidation states, which were Co2.8+ and Mn3.7+ near the surface after cycling. Thus, adding Mn to CoOx successfully stabilized the catalyst material and its activity during OER cycling. The development of stabilization approaches is essential to extend the durability of OER catalysts.

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“…The synergistic effect of transition metals has also been wildly studied. Lankouf and colleagues studied the impact of adding Mn to the cubic Co 3 O 4 and obtained increased electrocatalytic activity with a current density of 10 mA cm −2 at a relatively low overpotential of 327 mV [6]. Another study demonstrated the use of ultra-thin Co nanosheets coupled with N-doped carbon plate, which possessed a high specific surface area of 446.49 m 2 g −1 , which resulted in its efficient performance with an overpotential of 278 mV at 10 mA cm −2 [7].…”

Section: Introductionmentioning

confidence: 99%

Efficient Recovery of Lithium Cobaltate from Spent Lithium-Ion Batteries for Oxygen Evolution Reaction

Arif

Rashid

et al. 2021

Nanomaterials

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Owing to technological advancements and the ever-increasing population, the search for renewable energy resources has increased. One such attempt at finding effective renewable energy is recycling of lithium-ion batteries and using the recycled material as an electrocatalyst for the oxygen evolution reaction (OER) step in water splitting reactions. In electrocatalysis, the OER plays a crucial role and several electrocatalysts have been investigated to improve the efficiency of O2 gas evolution. Present research involves the use of citric acid coupled with lemon peel extracts for efficient recovery of lithium cobaltate from waste lithium-ion batteries and subsequent use of the recovered cathode material for OER in water splitting. Optimum recovery was achieved at 90 °C within 3 h of treatment with 1.5 M citric acid and 1.5% extract volume. The consequent electrode materials were calcined at 600, 700 and 800 °C and compared to the untreated waste material calcined at 600 °C for OER activity. The treated material recovered and calcined at 600 °C was the best among all of the samples for OER activity. Its average particle size was estimated to be within the 20–100 nm range and required a low overpotential of 0.55 V vs. RHE for the current density to reach 10 mA cm2 with a Tafel value of 128 mV/dec.

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MnxCo3-xO4 spinel oxides as efficient oxygen evolution reaction catalysts in alkaline media

Cited by 39 publications

References 63 publications

Tuning the intrinsic catalytic activities of oxygen-evolution catalysts by doping: a comprehensive review

Tuning the intrinsic catalytic activities of oxygen-evolution catalysts by doping: a comprehensive review

Stabilization of Co oxide during oxygen evolution in alkaline media by the introduction of Mn oxide

Efficient Recovery of Lithium Cobaltate from Spent Lithium-Ion Batteries for Oxygen Evolution Reaction

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