Optimal Geometrical Configuration of Cobalt Cations in Spinel Oxides to Promote Oxygen Evolution Reaction

Liu, Zhijuan; Wang, Guangjin; Zhu, Xiaoyan; Wang, Yanyong; Zou, Yuqin; Zang, Shuang‐Quan; Wang, Shuangyin

doi:10.1002/anie.201914245

Cited by 170 publications

(104 citation statements)

References 36 publications

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“…To gain deep understanding of the activity of different geometric configuration of cobalt cations, the XPS spectra was used for investigating the valence and electronic structure of Co 3 O 4 , ZnCo 2 O 4 and CoAl 2 O 4 after electrolysis, as shown in Figure S20. The Co 2p 3/2 was divided into two fitted peaks: Co 3+ (∼779–780 eV) and Co 2+ (∼781–782 eV) . The relative atom ratio of Co 3+ /Co 2+ after HMF oxidation was increased to 60 % for Co 3 O 4 (Figure S21), which is apparently higher than the atom ratio of CoAl 2 O 4 (31 %), indicating that Co were oxidized on the surface.…”

Section: Resultsmentioning

confidence: 98%

“…However, the atom ratio of ZnCo 2 O 4 was unchanged. The transformation process of HMF to HMFCA is markedly influenced by local concentration of oxyhydroxides, thus it has paid attention for investigating the content of metal oxyhydroxides recently . The four oxygen peaks contributions of O 1s region for the comparison of Co 3 O 4 , ZnCo 2 O 4 and CoAl 2 O 4 respectively.…”

Section: Resultsmentioning

confidence: 98%

“…The current was normalized by the BET specific surface area to reflect the intrinsic and specific activity. As shown in Figure d, Co 3 O 4 exhibits earlier onset potential than ZnCo 2 O 4 and CoAl 2 O 4 in KOH solution for OER, suggesting that CoO 6 octahedron was referred to as optimal geometrical configuration for OER . Once HMF was added into the electrolyte, the onset potential shifted to 1.3 V RHE and 1.35 V RHE for Co 3 O 4 and ZnCo 2 O 4 , respectively, while CoAl 2 O 4 showed almost barely activity for HMF oxidation.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Identifying the Geometric Site Dependence of Spinel Oxides for the Electrooxidation of 5‐Hydroxymethylfurfural

Dong

Huang

et al. 2020

Angewandte Chemie

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Co-based spinel oxides,which are of mixing valences with the presence of both Co 2+ and Co 3+ at different atom locations,are considered as promising catalysts for the electrochemical oxidation of 5-hydroxymethylfurfural (HMF). Identifying the role of each atom site in the electroxidation of HMF is critical to design the advanced electrocatalysts.Inthis work, we found that Co 2+ Td in Co 3 O 4 is capable of chemical adsorption for acidic organic molecules,a nd Co 3+ Oh play ad ecisive role in HMF oxidation. Thereafter,t he Cu 2+ was introduced in spinel oxides to enhance the exposure degree of Co 3+ and to boost acidic adsorption and thus to enhance the electrocatalytic activity for HMF electrooxidation significantly.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Identifying the Geometric Site Dependence of Spinel Oxides for the Electrooxidation of 5‐Hydroxymethylfurfural

Dong

Huang

et al. 2020

Angewandte Chemie

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“…Besides significant benefits from FeCo alloy, the surface oxide species may also play a key role in boosting OER as the positively charged metal cations in the oxide commonly possess enhanced properties to adsorb oxygen‐containing intermediates involved in the OER process (e.g., *OH, *O, *OOH). [ 25 ]…”

Section: Figurementioning

confidence: 99%

Porous FeCo Glassy Alloy as Bifunctional Support for High‐Performance Zn‐Air Battery

Pan

Yang

et al. 2020

Advanced Energy Materials

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The Zn‐air battery (ZAB) is attracting increasing attention due to its high safety and preeminent performance. However, the practical application of ZAB relies heavily on developing durable support materials to replace conventional carbon supports which have unrecoverable corrosion issues, severely jeopardizing ZAB performance. Herein, a novel porous FeCo glassy alloy is developed as a bifunctional catalytic support for ZAB. The conducting skeleton of the porous glassy alloy is used to stabilize oxygen reduction cocatalysts, and more importantly, the FeCo serves as the primary phase for oxygen evolution. To demonstrate the concept of catalytic glassy alloy support, ultrasmall Pd nanoparticles are anchored, as oxygen reduction active sites, on the porous FeCo (noted as Pd/FeCo) for ZAB. The Pd/FeCo exhibits a significantly improved electrocatalytic activity for oxygen reduction (a half‐wave potential of 0.85 V) and oxygen evolution (a potential of 1.55 V to reach 10 mA cm−2) in the alkaline media. When used in the ZAB, the Pd/FeCo delivers an output power density of 117 mW cm−2 and outstanding cycling stability for over 200 h (400 cycles), surpassing the conventional carbon‐supported Pt/C+IrO2 catalysts. Such an integrated design that combines highly active components with a porous architecture provides a new strategy to develop novel nanostructured electrocatalysts.

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“…The coordination geometry and the electronic configuration of transition‐metal centers can greatly affect the electrocatalytic performance [34,35] . The various orientations of phosphate/phosphonate ligands can lead to diverse structures, making metal phosphates/phosphonates an ideal platform to design active electrocatalysts with specific symmetries and geometries.…”

Section: Design Strategies For Highly Efficient Transition‐metal Phosmentioning

confidence: 99%

Design Strategies of Transition‐Metal Phosphate and Phosphonate Electrocatalysts for Energy‐Related Reactions

Zhao

Yuan

2020

ChemSusChem

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The key challenge to developing renewable energy conversion and storage devices lies in the exploration and rational engineering of cost‐effective and highly efficient electrocatalysts for various energy‐related electrochemical reactions. Transition‐metal phosphates and phosphonates have shown remarkable performances for these reactions based on their unique physicochemical properties. Compared with transition‐metal oxides, phosphate groups in transition‐metal phosphates and phosphonates show flexible coordination with diverse orientations, making them an ideal platform for designing active electrocatalysts. Although numerous efforts have been spent on the development of transition‐metal phosphate and phosphonate electrocatalysts, some urgent issues, such as low intrinsic catalytic efficiency and low electronic conductivity, have to be resolved in accordance with their applications. In this Review, we focus on the design strategies of highly efficient transition‐metal phosphate and phosphonate electrocatalysts, with special emphasis on the tuning of transition‐metal‐center coordination environment, optimization of electronic structures, increase of catalytically active site densities, and construction of heterostructures. Guided by these strategies, recently developed transition‐metal phosphate and phosphonate materials have exhibited excellent activity, selectivity, and stability for various energy‐related electrocatalytic reactions, showing great potential for replacing noble‐metal‐based catalysts in next‐generation advanced energy techniques. The existing challenges and prospects regarding these materials are also presented.

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Optimal Geometrical Configuration of Cobalt Cations in Spinel Oxides to Promote Oxygen Evolution Reaction

Cited by 170 publications

References 36 publications

Identifying the Geometric Site Dependence of Spinel Oxides for the Electrooxidation of 5‐Hydroxymethylfurfural

Identifying the Geometric Site Dependence of Spinel Oxides for the Electrooxidation of 5‐Hydroxymethylfurfural

Porous FeCo Glassy Alloy as Bifunctional Support for High‐Performance Zn‐Air Battery

Design Strategies of Transition‐Metal Phosphate and Phosphonate Electrocatalysts for Energy‐Related Reactions

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