Electronic modulation and surface reconstruction of cactus-like CoB<sub>2</sub>O<sub>4</sub>@FeOOH heterojunctions for synergistically triggering oxygen evolution reactions

Cai, Run; Dai, Xiaoping; Nie, Fei; Gan, Yonghao; Ye, Ying; Ren, Zeyu; Liu, Yujie; Wu, Baoqiang; Cao, Yihua; Zhang, Xin

doi:10.1039/d2ta01929a

Cited by 33 publications

(12 citation statements)

References 72 publications

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“…All of these results support the successful construction of a NiFeP x /NiFeO x heterostructure with abundant amorphous–crystalline interfaces. Note that the coupled amorphous–crystalline interfaces may provide abundant active sites, induce the redistribution of electrons, and facilitate the adsorption and activation energy of intermediates, , thereby promoting the OER activity.…”

Section: Resultsmentioning

confidence: 99%

Constructing Amorphous–Crystalline Interfaces of Nickel–Iron Phosphides/Oxides for Oxygen Evolution Reaction

Guo

Chen

Zhong

et al. 2023

Ind. Eng. Chem. Res.

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Oxygen evolution reaction (OER) is the bottleneck of electrocatalytic water splitting due to its sluggish proton-coupled four-electron-transfer kinetics. Interface engineering has been regarded as an effective strategy to promote the OER performance of transition-metal oxide (TMO) electrocatalysts. In this study, we successfully construct the amorphous–crystalline interfaces of NiFeP x /NiFeO x nanosheets with substantial oxygen vacancies through controllable surface phosphorization. Experimental results confirm that the unique structure possesses fast charge transfer, abundant active sites, and enhanced intrinsic activity, resulting in the outstanding OER performance. The optimized NiFeP x /NiFeO x displays a low overpotential of 238 mV at 20 mA cm–2 and excellent stability in 1 M KOH electrolyte. This study provides an effective strategy to promote the OER performance of TMOs in alkaline water splitting.

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Section: Resultsmentioning

confidence: 99%

Constructing Amorphous–Crystalline Interfaces of Nickel–Iron Phosphides/Oxides for Oxygen Evolution Reaction

Guo

Chen

Zhong

et al. 2023

Ind. Eng. Chem. Res.

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“…It is reported that the strong interactions between the two elements (Co and Fe) can effectively improve the electrocatalytic activity of alloys for OER [ 55 , 56 ]. The close contact between Mo 2 C and CoFe (heterojunction) should lead to the modification of the structure of CoFe alloy, contributing to the formation of highly active CoOOH/FeOOH [ 57 , 58 ]. Moreover, although the protecting role of NG can delay the oxidation of metallic species, the formation of ionic states (Co 2+ /Fe 2+ ) of Co/Fe is inevitable, which can effectively accelerate the formation of the key active species (CoOOH/FeOOH) for OER [ 59 ].…”

Section: Resultsmentioning

confidence: 99%

CoFe Alloy-Coupled Mo2C Wrapped by Nitrogen-Doped Carbon as Highly Active Electrocatalysts for Oxygen Reduction/Evolution Reactions

et al. 2023

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Molybdenum carbide (Mo2C) with a Pt-like d-band electron structure exhibits certain activities for oxygen reduction and evolution reactions (ORR/OER) in alkaline solutions, but it is questioned due to its poor OER stability. Combining Mo2C with transition metals alloy is a feasible way to stabilize its electrochemical activity. Herein, CoFe-Prussian blue analogues are used as a precursor to compound with graphitic carbon nitride and Mo6+ to synthesize FeCo alloy and Mo2C co-encapsulated N-doped carbon (NG-CoFe/Mo2C). The morphology of NG-CoFe/Mo2C (800 °C) shows that CoFe/Mo2C heterojunctions are well wrapped by N-doped graphitic carbon. Carbon coating not only inhibits growth and agglomeration of Mo2C/CoFe, but also enhances corrosion resistance of NG-CoFe/Mo2C. NG-CoFe/Mo2C (800 °C) exhibits an excellent half-wave potential (E1/2 = 0.880 V) for ORR. It also obtains a lower OER overpotential (325 mV) than RuO2 due to the formation of active species (CoOOH/β-FeOOH, as indicated by in-situ X-ray diffraction tests). E1/2 shifts only 6 mV after 5000 ORR cycles, while overpotential for OER increases only 19 mV after 1000 cycles. ORR/OER performances of NG-CoFe/Mo2C (800 °C) are close to or better than those of many recently reported catalysts. It provides an interfacial engineering strategy to enhance the intrinsic activity and stability of carbides modified by transition-metals alloy for oxygen electrocatalysis.

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“…29 In these heterostructures, the synthesis of FeOOH mostly relies on the hydrolysis of Fe 3+ under various conditions, for example, under hydrothermal or electrodeposition conditions. [30][31][32] However, the construction of elegant nanostructures under relatively mild reaction conditions remains a challenge. 33,34 Recently, as exampled by Ping Xu and co-workers, the property of Fe salts that are used as raw materials may influence the crystalline phase and morphology of FeOOH greatly.…”

Section: Introductionmentioning

confidence: 99%

Self-standing 2D/2D Co₃O₄@FeOOH nanosheet arrays as promising catalysts for the oxygen evolution reaction

Wang

Xiang

et al. 2023

Dalton Trans.

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Electronic modulation and surface reconstruction of cactus-like CoB₂O₄@FeOOH heterojunctions for synergistically triggering oxygen evolution reactions

Abstract: The cactus-like heterojunction with FeOOH nanosheets wrapped on CoB2O4 nanorod/nickel foam (CoB2O4@FeOOH/NF) was fabricated by hydrothermal and electrodeposition strategy for OER process. Benefiting from the cactus-like architecture for fast mass...

Cited by 33 publications

References 72 publications

Constructing Amorphous–Crystalline Interfaces of Nickel–Iron Phosphides/Oxides for Oxygen Evolution Reaction

Constructing Amorphous–Crystalline Interfaces of Nickel–Iron Phosphides/Oxides for Oxygen Evolution Reaction

CoFe Alloy-Coupled Mo2C Wrapped by Nitrogen-Doped Carbon as Highly Active Electrocatalysts for Oxygen Reduction/Evolution Reactions

Self-standing 2D/2D Co₃O₄@FeOOH nanosheet arrays as promising catalysts for the oxygen evolution reaction

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Electronic modulation and surface reconstruction of cactus-like CoB2O4@FeOOH heterojunctions for synergistically triggering oxygen evolution reactions

Abstract: The cactus-like heterojunction with FeOOH nanosheets wrapped on CoB2O4 nanorod/nickel foam (CoB2O4@FeOOH/NF) was fabricated by hydrothermal and electrodeposition strategy for OER process. Benefiting from the cactus-like architecture for fast mass...

Cited by 33 publications

References 72 publications

Constructing Amorphous–Crystalline Interfaces of Nickel–Iron Phosphides/Oxides for Oxygen Evolution Reaction

Constructing Amorphous–Crystalline Interfaces of Nickel–Iron Phosphides/Oxides for Oxygen Evolution Reaction

CoFe Alloy-Coupled Mo2C Wrapped by Nitrogen-Doped Carbon as Highly Active Electrocatalysts for Oxygen Reduction/Evolution Reactions

Self-standing 2D/2D Co3O4@FeOOH nanosheet arrays as promising catalysts for the oxygen evolution reaction

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Electronic modulation and surface reconstruction of cactus-like CoB₂O₄@FeOOH heterojunctions for synergistically triggering oxygen evolution reactions

Self-standing 2D/2D Co₃O₄@FeOOH nanosheet arrays as promising catalysts for the oxygen evolution reaction