Facet effect of Co3O4 nanocrystals on visible-light driven water oxidation

Zhou, Xichen; Liu, Zhen; Wang, Yifan; Ding, Yong

doi:10.1016/j.apcatb.2018.05.067

Cited by 98 publications

(39 citation statements)

References 51 publications

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“…As discussed above, compared with NCO‐400‐Air , NCO‐400‐N 2 exhibited significantly better OER activity, which could be due to the following intrinsic reason. It was reported that there were more Co 3+ cations in the (110) crystal plane of Co 3 O 4 , which were the main OER active sites . It was also reported that Ni 3+ ‐rich surface of Ni–Co oxides was the main redox sites for OER .…”

Section: Resultsmentioning

confidence: 96%

Highly Active Core–Shell Carbon/NiCo₂O₄ Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability

Zhang

et al. 2019

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Developing highly efficient electrocatalysts with earth abundant elements for oxygen evolution reaction (OER) is a promising way to store light or electrical energy in the form of chemical energy. Here, a new type of electrocatalyst with core–shell carbon/NiCo2O4 double microtubes architecture is successfully synthesized through a hydrothermal method combined with the calcination process with wet tissues as the template and carbon resource. The outer NiCo2O4 nanosheet arrays contain abundant defects, which come from reduction of the carbon in wet tissues. This indicates that carbon is a very excellent defect inducer. The inner carbon microtubes can act as the robust structure skeleton and these core–shell double microtubes provide abundant diffusion channels for oxygen and electrolyte, both of which contribute to improving the stability by avoiding damage to the electrode from produced O2 bubbles and the collapse of the outer NiCo2O4 microtubes. Electrochemical results show that the electrode, core–shell carbon/NiCo2O4 double microtubes loaded on carbon cloth, exhibits prominent electrocatalytic activity with an overpotential of only 168 mV at 10 mA cm−2 and a Tafel slope as low as 57.6 mV dec−1 in 1.0 mol L−1 KOH. This new type of electrocatalyst possesses great potential in water electrolyzers and rechargeable metal–air batteries.

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Section: Resultsmentioning

confidence: 96%

Highly Active Core–Shell Carbon/NiCo₂O₄ Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability

Zhang

et al. 2019

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“…212,[248][249][250] Therefore, the rational design of catalysts exposing their most favorable active facets is a promising route towards rapid OER kinetics. [250][251][252][253] For example, well-defined spinel cobalt oxides with exposed (100) and (111) planes were prepared for the investigation of facet-dependent electrocatalytic activity. 248 The electrochemical measurements and theoretical studies showed that the (111) plane of Co 3 O 4 exposed a higher density of cobalt ions compared to the (100) plane, thereby offering more catalytically active centers.…”

Section: Mechanistically Driven Design Of Heterogeneous Wocsmentioning

confidence: 99%

Molecular and heterogeneous water oxidation catalysts: recent progress and joint perspectives

et al. 2021

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“…27,28 Therefore, considerable attempts have been made to improve the oxygen evolution reaction (OER) performance of pristine Co 3 O 4 , which is limited by conductivity and the number of exposed surface active sites. 29 To this end, various specific properties were addressed, such as crystallinity, 30,31 oxidation states, 32,33 particle/crystallite size, 34,35 defects, 36 crystal structure, 37−40 surface area, 41 and morphology. 42,43,29 Defects in particular can exert a great influence on the interaction between the reactants and the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

“…29 To this end, various specific properties were addressed, such as crystallinity, 30,31 oxidation states, 32,33 particle/crystallite size, 34,35 defects, 36 crystal structure, 37−40 surface area, 41 and morphology. 42,43,29 Defects in particular can exert a great influence on the interaction between the reactants and the catalyst surface. 44−48 While oxygen defects in Co 3 O 4 created a higher amount of active Co(II) surface species, cobalt deficiencies were found to enhance the surface wettability.…”

Section: Introductionmentioning

confidence: 99%

Preparative History vs Driving Force in Water Oxidation Catalysis: Parameter Space Studies of Cobalt Spinels

et al. 2019

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The development of efficient, stable, and economic water oxidation catalysts (WOCs) is a forefront topic of sustainable energy research. We newly present a comprehensive three-step approach to systematically investigate challenging relationships among preparative history, properties, and performance in heterogeneous WOCs. To this end, we studied (1) the influence of the preparative method on the material properties and (2) their correlation with the performance as (3) a function of the catalytic test method. Spinel-type Co3O4 was selected as a clear-cut model WOC and synthesized via nine different preparative routes. In search of the key material properties for high catalytic performance, these cobalt oxide samples were characterized with a wide range of analytical methods, including X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, Raman spectroscopy, BET surface area analysis, and transmission electron microscopy. Next, the corresponding catalytic water oxidation activities were assessed with the three most widely applied protocols to date, namely, photocatalytic, electrocatalytic, and chemical oxidation. The activity of the Co3O4 samples was found to clearly depend on the applied test method. Increasing surface area and disorder as well as a decrease in oxidation states arising from low synthesis temperatures were identified as key parameters for high chemical oxidation activity. Surprisingly, no obvious property–performance correlations were found for photocatalytic water oxidation. In sharp contrast, all samples showed similar activity in electrochemical water oxidation. The substantial performance differences between the applied protocols demonstrate that control and comprehensive understanding of the preparative history are crucial for establishing reliable structure–performance relationships in WOC design.

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Facet effect of Co3O4 nanocrystals on visible-light driven water oxidation

Cited by 98 publications

References 51 publications

Highly Active Core–Shell Carbon/NiCo₂O₄ Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability

Highly Active Core–Shell Carbon/NiCo₂O₄ Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability

Molecular and heterogeneous water oxidation catalysts: recent progress and joint perspectives

Preparative History vs Driving Force in Water Oxidation Catalysis: Parameter Space Studies of Cobalt Spinels

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Facet effect of Co3O4 nanocrystals on visible-light driven water oxidation

Cited by 98 publications

References 51 publications

Highly Active Core–Shell Carbon/NiCo2O4 Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability

Highly Active Core–Shell Carbon/NiCo2O4 Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability

Molecular and heterogeneous water oxidation catalysts: recent progress and joint perspectives

Preparative History vs Driving Force in Water Oxidation Catalysis: Parameter Space Studies of Cobalt Spinels

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Product

Resources

About

Highly Active Core–Shell Carbon/NiCo₂O₄ Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability

Highly Active Core–Shell Carbon/NiCo₂O₄ Double Microtubes for Efficient Oxygen Evolution Reaction: Ultralow Overpotential and Superior Cycling Stability