Oxygen vacancy-based ultrathin Co3O4 nanosheets as a high-efficiency electrocatalyst for oxygen evolution reaction

Zhang, Sufeng; Wei, Ning; Yao, Zijie; Zhao, Xinyu; Du, Min; Zhou, Qiusheng

doi:10.1016/j.ijhydene.2020.11.072

Cited by 41 publications

(16 citation statements)

References 43 publications

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“…[50][51][52] It will promote the generation of additional active sites to increase charge transfer rates, thereby improving reaction kinetics and ultimately enhancing catalytic performance. [52] According to relevant literatures, [37,48,53] the electrons neighboring the oxygen vacancy that previously occupied the O 2p orbital become delocalized and decreased the charge density and coordination of Co 3 + , therefore, some Co 3 + ions are reduced to Co 2 + . Consequently, the presence of more Co 2 + in Co 3 O 4 nanoparticles could help to form more oxygen vacancies.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy‐Enriched Co₃O₄ as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Zhang

Gan

et al. 2022

ChemElectroChem

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Herein, a reduced Co3O4/C (rCo3O4/C) composite with rich oxygen vacancies has been fabricated through facile sodium borohydride reduction treatment to act as an effective promoter for Pt nanoparticles (NPs). The Pt NPs are highly dispersed onto the hybrid support with average size of 1.89 nm. Electrochemical measurements show that the Pt−rCo3O4/C‐2 h catalyst with abundant oxygen vacancies possesses better CO tolerance and stability and exhibits a higher mass activity (MA) of 1412 mA ⋅ mg−1(Pt) than that of pristine Co3O4/C supported Pt nanoparticles (Pt−pCo3O4/C) in acidic medium. The enhanced catalytic performance can be attributed to sodium borohydride reduction enriching the oxygen vacancies of Co3O4, which can generate a large amount of −OH species more easily via hydrolysis to oxidize CO species adsorbed on Pt surface to release Pt active sites. Consequently, the construction of oxygen vacancy‐rich materials as co‐catalysts can deliver excellent catalytic performance for Pt‐based electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy‐Enriched Co₃O₄ as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Zhang

Gan

et al. 2022

ChemElectroChem

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“…[14][15][16] Among these electrocatalysts, cobalt oxides and perovskite oxides (ABO 3 , where the A sites are commonly rare-earth-metal or alkaline-earth-metal ions and the B sites are commonly transition-metal ions) have been widely studied, and their electronic structure can be adjusted by regulating their oxidation state. [17][18][19] For instance, Zhou et al [20] synthesized ultrathin Co 3 O 4 nanosheets with abundant oxygen vacancies via a simple two-step method comprising a hydrothermal process and pre-oxidation, and it exhibited excellent OER catalytic activity, with overpotential 367 mV for 10 mA cm À 2 . Although the Co 3 O 4 catalysts have various advantages, their significant obstacle for OER lies in its intrinsic poor conductivity due to the relatively low concentration of oxygen vacancy defects.…”

Section: Introductionmentioning

confidence: 99%

Overdoping Strategy for Preparing a Two‐Phase Oxide Electrocatalyst to Boost Oxygen Evolution Reaction

Cai

Wei

Chen

et al. 2022

Chemistry An Asian Journal

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The oxygen evolution reaction is of great significance to the production of hydrogen from high efficiency electrolytic water, hydrogen oxygen fuel cell and other energy conversion devices, but there are many challenges such as high cost, low efficiency and poor stability of catalysts. Among non‐precious metal catalysts, oxide has its unique advantages. We used overdoping strategy to prepare two‐phase oxide electrocatalyst SrCo0.9Fe0.05Mo0.35Ox (SCFM0.35) containing double perovskite and Co3O4 with excellent OER electrocatalytic activity and stability in alkaline solution. It required an overpotential of 361.7 mV to reach a 10 mA cm−2 current density and its performance only degrades by 3.48% after 1000 CV cycles accelerated stability tests, whose electrochemical performance is superior to that of single‐phase double perovskites and undoped perovskites. SrCo0.9Fe0.1O3 (SCF) ordinary perovskite is doped with slightly molybdenum (Mo), and then the ordinary perovskite turns into double perovskite because of the polyvalence characteristics of Mo. When Mo is overdoped, Co3O4 phase was precipitated while Mo entered perovskite phase. This process causes lattice distortion and makes the surface electronic structure benign changes. Furthermore, the microscopic morphology of the material surface and the valence state of cobalt element are changed, thereby improving the microenvironment of the electrochemical process.

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“…On the one hand, it is demonstrated that vacancy defects play a positive role in enhancing electrocatalytic reactions. For instance, Co 3 O 4 nanosheets with abundant oxygen vacancies were obtained by calcination and demonstrated good activity for OER . Cai et al reported the introduction of oxygen defects into Co 3 O 4 nanosheets by solvothermal reduction .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Co 3 O 4 nanosheets with abundant oxygen vacancies were obtained by calcination and demonstrated good activity for OER. 18 Cai et al reported the introduction of oxygen defects into Co 3 O 4 nanosheets by solvothermal reduction. 19 To date, the methods for producing vacancy defects generally involve high-temperature treatment.…”

Section: ■ Introductionmentioning

confidence: 99%

Mo/P Dual-Doped Co/Oxygen-Deficient Co₃O₄ Core–Shell Nanorods Supported on Ni Foam for Electrochemical Overall Water Splitting

Hao

Fan

et al. 2021

ACS Appl. Mater. Interfaces

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The exploration for low-cost bifunctional materials for highly efficient overall water splitting has drawn profound research attention. Here, we present a facile preparation of Mo−P dual-doped Co/oxygen-deficient Co 3 O 4 core−shell nanorods as a highly efficient electrocatalyst. In this strategy, oxygen vacancies are first generated in Co 3 O 4 nanorods by lithium reduction at room temperature, which endows the materials with bifunctional characteristics of the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). A Co layer doped with Mo and P is further deposited on the surface of the Co 3 O 4−x nanorods to enhance the electrocatalytic hydrolysis performance. As a result, the overpotentials of HER and OER are only 281 and 418 mV at a high current density of 100 mA cm −2 in 1.0 M KOH, respectively. An overall water electrolytic cell using CoMoP@Co 3 O 4−x nanorods as both electrodes can reach 10 mA cm −2 at 1.614 V with outstanding durability. The improvement is realized by the synergistic effect of oxygen vacancies, Mo/P doping, and core−shell heterostructures for modulating the electronic structure and producing more active sites, which suggests a promising method for developing cost-effective and stable electrocatalysts.

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Oxygen vacancy-based ultrathin Co3O4 nanosheets as a high-efficiency electrocatalyst for oxygen evolution reaction

Cited by 41 publications

References 43 publications

Oxygen Vacancy‐Enriched Co₃O₄ as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Oxygen Vacancy‐Enriched Co₃O₄ as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Overdoping Strategy for Preparing a Two‐Phase Oxide Electrocatalyst to Boost Oxygen Evolution Reaction

Mo/P Dual-Doped Co/Oxygen-Deficient Co₃O₄ Core–Shell Nanorods Supported on Ni Foam for Electrochemical Overall Water Splitting

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Oxygen vacancy-based ultrathin Co3O4 nanosheets as a high-efficiency electrocatalyst for oxygen evolution reaction

Cited by 41 publications

References 43 publications

Oxygen Vacancy‐Enriched Co3O4 as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Oxygen Vacancy‐Enriched Co3O4 as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Overdoping Strategy for Preparing a Two‐Phase Oxide Electrocatalyst to Boost Oxygen Evolution Reaction

Mo/P Dual-Doped Co/Oxygen-Deficient Co3O4 Core–Shell Nanorods Supported on Ni Foam for Electrochemical Overall Water Splitting

Contact Info

Product

Resources

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Oxygen Vacancy‐Enriched Co₃O₄ as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Oxygen Vacancy‐Enriched Co₃O₄ as Efficient Co‐catalyst for Pt Nanoparticles towards Methanol Electrooxidation

Mo/P Dual-Doped Co/Oxygen-Deficient Co₃O₄ Core–Shell Nanorods Supported on Ni Foam for Electrochemical Overall Water Splitting