Stable Potential Windows for Long‐Term Electrocatalysis by Manganese Oxides Under Acidic Conditions

Li, Ailong; Ooka, Hideshi; Bonnet, Nadège; Hayashi, Toru; Sun, Yimeng; Jiang, Qike; Li, Can; Han, Hongxian; Nakamura, Ryuhei

doi:10.1002/ange.201813361

Cited by 58 publications

(46 citation statements)

References 53 publications

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“…Commercial IrO 2 as anode (IrO 2 /29BC) results are included for comparison. d) Overpotentials and stability of various 3 d ‐metal OER catalysts in acidic media in previous reports, [ 3,5–7,17,21,31 ] compared with our catalyst in terms of activity, stability at 10 mA cm −1 .…”

Section: Resultsmentioning

confidence: 92%

“…These include 1) the addition of conductive corrosion‐resistant elements or support, [ 3,4 ] 2) methods for enhanced electrical and mechanical interfaces between the active materials and the support, [ 5 ] and 3) the precise control of the operating window. [ 6 ] Through these approaches, extended stabilities (> 12 h) at 10 mA cm −1 in 0.5 m H 2 SO 4 have been reported. In particular, carbon‐coated Co 3 O 4 nanosheets showed very low OER in 0.5 m H 2 SO 4 with a small overpotential of 370 mV and a long lifetime of 86.8 h at a constant current density of 100 mA cm −2 .…”

Section: Introductionmentioning

confidence: 99%

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One‐Step Synthesis of Carbon‐Protected Co₃O₄ Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

Lai

Veeramani

Aguey‐Zinsou

et al. 2021

Adv Energy and Sustain Res

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The design and development of highly efficient and stable oxygen evolution reaction (OER) electrocatalysts in acid media are important for various renewable technologies. Herein, an advanced Co3O4 electrocatalyst supported on a mesoporous hydrophobic carbon paper (Co/29BC) is formed via a simple one‐step thermal decomposition of cobalt nitrate. Through this novel approach, the amorphous carbon layer resulting from the thermal decomposition of carbon‐containing species in the mesoporous layer provides enhanced electronic conduction and protection against corrosion to the Co3O4 nanoparticles. Equally important, the OER performance is found to be correlated with the morphology and surface composition of Co3O4. With optimized Co3+ active sites and oxygen vacancies at the metal oxide surface, the Co3O4 catalyst shows superior OER performance and durability in a proton exchange membrane (PEM) water electrolyzer, with a small overpotential (350 mV) at a constant current density of 10 mA cm−1 for over 50 h. Accordingly, this work provides new insights toward the design of high‐performance and highly stable OER electrocatalysts in corrosive acidic environments.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

One‐Step Synthesis of Carbon‐Protected Co₃O₄ Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

Lai

Veeramani

Aguey‐Zinsou

et al. 2021

Adv Energy and Sustain Res

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“…[ 96 ] MnO x ‐based material in acidic pH environment showed a quasi‐infinite Tafel slope, without dependence on proton concentration. [ 97 ] γ‐MnO 2 showed OER performance at a current density of 10 mA/cm 2 with overpotential of 428 mV in acidic media, and by doping with TiO 2 its stability was further improved (Figure 5B,C). [ 98 ] This MnO 2 shows less OER activity as compared to Co 3 O 4 , which exhibits better OER performance in acid, but has problem of corrosion.…”

Section: Electrocatalysts For Acidic Oermentioning

confidence: 99%

Electrocatalytic acidic oxygen evolution reaction: From nanocrystals to single atoms

et al. 2021

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Hydrogen is the most preferred choice as an energy source to replace the nonrenewable energy resources such as fossil fuels due to its beneficial features of abundance, ecofriendly, and outstanding gravimetric energy density. Splitting water through a proton exchange membrane (PEM) electrolyzer is a well‐known method of hydrogen production. But the major impediment is the sluggish kinetics of oxygen evolution reaction (OER). Currently, scientists are struggling to build out an acid‐stable electrocatalyst for OER with low overpotential and excellent stability. In this review, the reaction mechanism and characterization parameters of OER are introduced, and then the improvement method of metal nanocatalysts (noble metal catalysts and noble metal‐free catalysts) in acidic media is discussed. Particularly, the application of single‐atom catalysts in acidic OER is summarized, which is current researching focus. At the same time, we also briefly introduced the cluster phenomenon, which is easy to occur in the preparation of single‐atom catalysts. More importantly, we summarized the in situ characterization methods such as in situ X‐ray absorption spectroscopy, in situ X‐ray photoelectron spectroscopy, and so forth, which are conducive to further understanding of OER reaction intermediates and active sites. Finally, we put forward some opinions on the development of acidic OER.

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“…The measured potential maintained below 1.30 V versus NHE for 21 h, which is lower than the applied potential for bare Ni foam. The slight decrease of measured potential for the nano‐catalysts was attributed to Mn dissolution process in the form of Mn 2+ and MnO 4 − during OER . The increase of measured potential for bare Ni foam was due to the formation of oxidized layers.…”

Section: Lattice Constants and Unit Cell Volume Calculated From Xrd Pmentioning

confidence: 99%

Nickel‐Doping Effect on Mn₃O₄ Nanoparticles for Electrochemical Water Oxidation under Neutral Condition

et al. 2020

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As the demand for energy has dramatically increased in the past decade, electrochemical water splitting has been regarded as an attractive approach to produce renewable hydrogen energy. However, large overpotentials of oxygen‐evolving reaction (OER) is a key bottleneck for practical application. Thus, water‐oxidizing electrocatalysts with low cost and high efficiency should be developed. Here, 5 nm‐sized Mn3O4 nanoparticles (NPs) are synthesized by a hydrothermal method, which is appropriate for large‐scale production. To further improve their performance, various 3d transition metal elements are successfully doped in Mn3O4 NPs. Ni‐doped Mn3O4 NPs exhibit the highest efficiency among the Mn3O4 NPs doped with various elements. Based on structural analysis, the Ni‐doping process leads to the lattice distortion of their tetragonal spinel structure and it strongly correlates with the enhancement of OER activity. The overpotential at the current density of 10 mA cm–2 is 524 and 458 mV for pristine and 5 at% doped Mn3O4 NPs under neutral condition. The heteroatom‐doping process in sub‐10 nm‐sized nanocatalysts is expected to be a promising methodology to induce distorted structure related to active species. Thus, it can be effective to improve catalytic performance of various heterogeneous nano‐catalysts.

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Stable Potential Windows for Long‐Term Electrocatalysis by Manganese Oxides Under Acidic Conditions

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 58 publications

References 53 publications

One‐Step Synthesis of Carbon‐Protected Co₃O₄ Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

One‐Step Synthesis of Carbon‐Protected Co₃O₄ Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

Electrocatalytic acidic oxygen evolution reaction: From nanocrystals to single atoms

Nickel‐Doping Effect on Mn₃O₄ Nanoparticles for Electrochemical Water Oxidation under Neutral Condition

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Stable Potential Windows for Long‐Term Electrocatalysis by Manganese Oxides Under Acidic Conditions

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 58 publications

References 53 publications

One‐Step Synthesis of Carbon‐Protected Co3O4 Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

One‐Step Synthesis of Carbon‐Protected Co3O4 Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

Electrocatalytic acidic oxygen evolution reaction: From nanocrystals to single atoms

Nickel‐Doping Effect on Mn3O4 Nanoparticles for Electrochemical Water Oxidation under Neutral Condition

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Product

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One‐Step Synthesis of Carbon‐Protected Co₃O₄ Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

One‐Step Synthesis of Carbon‐Protected Co₃O₄ Nanoparticles toward Long‐Term Water Oxidation in Acidic Media

Nickel‐Doping Effect on Mn₃O₄ Nanoparticles for Electrochemical Water Oxidation under Neutral Condition