Hybrid-metal hydroxyl fluoride nanosheet arrays as a bifunctional electrocatalyst for efficient overall water splitting

Li, Yafei; Zhai, Xingwu; Fan, Changchun; Chen, Xunxin; Liu, Yinglun; Yang, Jueming; Chen, Long; Ge, Guixian; Zhang, Jinli

doi:10.1039/d2ta00502f

Cited by 15 publications

(14 citation statements)

References 49 publications

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“…The peak at 284.9 eV belongs to the sp 2 hybridized carbon material, which corresponds to CC, and the other two peaks correspond to C–N and CO, respectively. Figure c is a high-resolution XPS spectrum of Co 2p, which shows the characteristic peaks of Co 2p 3/2 and Co 2p 1/2 as well as the corresponding oscillating satellite peaks, which are associated with typical Co 2+ (∼782.3 and 798.2 eV) and Co 3+ (∼780.3 eV) species, respectively. , Specifically, the oscillating satellite peaks are represented as “Sat.” in Figure 3c. Figure d illustrates a high-resolution map of O 1s, which can be dissociated into two peaks, and the strongest peak at 531.3 eV is attributed to the hydroxyl group (•OH) contained in the material, again verifying the existence of •OH in the sample.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3c is a high-resolution XPS spectrum of Co 2p, which shows the characteristic peaks of Co 2p 3/2 and Co 2p 1/2 as well as the corresponding oscillating satellite peaks, which are associated with typical Co 2+ (∼782.3 and 798.2 eV) and Co 3+ (∼780.3 eV) species, respectively. 29,30 Specifically, the oscillating satellite peaks are represented as "Sat." in Figure 3c.…”

Section: Preparation and Characterization Of Coohf/n−c Electrode The ...mentioning

confidence: 99%

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Nanoneedles of Cobalt Hydroxyfluoride on N-Doped Porous Carbon as Anodes for Lithium-Ion Batteries

Zhu,

Liu,

et al. 2023

Energy Fuels

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The development of new composite materials with micro-and nanostructures and the realization of rapid transmission of lithium ions are crucial for the high-performance anode materials of lithium-ion batteries. Cobalt-based composites have received considerable attention on account of their unique physicochemical properties and good electrochemical performance. Therefore, it is of great significance to synthesize new Co-based composites and to research their electrochemical properties. In this work, nanoneedle CoOHF was successfully loaded on N-doped porous carbon (CoOHF/N−C) by facile sintering and hydrothermal method for the first time, which possessed excellent cycle stability and fast lithium-ion transport kinetics. The special porous structure in CoOHF/N−C can effectively alleviate the volume effect of CoOHF during cyclic charging and discharging, and the nanoneedle CoOHF presents a flower-like structure, which can also provide a large specific surface area, which ensures more active sites and shorter diffusion paths for rapid Li + diffusion, thus offering a larger electrode/electrolyte interface for charge transfer. Under these synergistic effects, the CoOHF/N−C anode has excellent electrochemical performance, including an admirable initial discharge capacity of 1203.7 mAh g −1 at 200 mA g −1 , a high reversible capacity of 913.3 mAh g −1 after 300 cycles, and a high Li + diffusion coefficient, ensuring improved cycling stability and rate performance. This work opens up the possibility of novel ways of designing new Co-based nanoanode materials for high-performance lithium-ion batteries.

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Section: Resultsmentioning

confidence: 99%

Section: Preparation and Characterization Of Coohf/n−c Electrode The ...mentioning

confidence: 99%

Nanoneedles of Cobalt Hydroxyfluoride on N-Doped Porous Carbon as Anodes for Lithium-Ion Batteries

Zhu,

Liu,

et al. 2023

Energy Fuels

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“…A graphite rod, Hg/HgO, and as-synthesized electrocatalysts served as the counter electrode, the reference electrode, and the working electrode, respectively. The measured potential was converted to the reversible hydrogen electrode (RHE) potential based on the equation: E RHE = E Hg/HgO + 0.098 + 0.059 × pH, and the overpotential (η) for the OER was calculated according to the formula: η = E RHE − 1.23 39 (with the details in the Supporting Information).…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Double Perovskite-Type (NH₄)₃Fe_xCo_1–xF₆ Electrocatalyst for Efficient Water Oxidation

Zhai

et al. 2022

ACS Appl. Energy Mater.

Self Cite

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It is of great significance for the development of efficient nonprecious electrocatalysts to boost the sluggish oxygen evolution reaction (OER). Here, we propose that Fe cation-bound ammonium fluoride (NH 4 F) can serve as a structure-directing agent to replace the imidazole ligand in zeolitic imidazolate framework-67 (ZIF-67), thereby forming a bimetallic fluoride with a double-perovskite structure [(NH 4 ) 3 Fe x Co 1−x F 6 , NFCF]. This NFCF electrocatalyst has a unique open-frame structure, which can provide rich active sites, a large electrochemical surface area, and extra electrolyte diffusion channels. The calculation results of density functional theory (DFT) reveal that this NFCF electrocatalyst has a lower energy barrier of OOH* to O 2 than that of the perovskite-type fluoride. The co-existence of Co and Fe in the NFCF is beneficial to weaken the OH* adsorption energy during OER catalysis.At current densities of 10 and 100 mA cm −2 , the NFCF electrocatalyst only needs a low overpotential of 243 and 360 mV, respectively. In addition, it can maintain an operating stability for up to 100 h at a constant current of 100 mA cm −2 . This study will help us to develop double-perovskite electrocatalysts for efficient water oxidation.

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“…Previous studies have corroborated that, due to the carbothermal reduction reaction, some transition-metal species can be reduced by the carbon generated from the peripheral organic ligands at a high temperature, thus producing the heterojunction of metal and metal oxide [ 38 , 39 , 40 ]. The generated metal and metal oxide can be used as catalytic sites to drive the cathode and anode reactions, respectively [ 41 , 42 ]. Meanwhile, the metal–metal oxide heterojunction can alter the electronic distribution of the active sites, resulting in an inspiring electrocatalytic activity [ 31 , 43 , 44 , 45 ].…”

Section: Introductionmentioning

confidence: 99%

CoO–Co Heterojunction Covered with Carbon Enables Highly Efficient Integration of Hydrogen Evolution and 5-Hydroxymethylfurfural Oxidation

et al. 2023

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The renewable-energy-driven integration of hydrogen production and biomass conversion into value-added products is desirable for the current global energy transition, but still a challenge. Herein, carbon-coated CoO–Co heterojunction arrays were built on copper foam (CoO–Co@C/CF) by the carbothermal reduction to catalyze the hydrogen evolution reaction (HER) coupled with a 5-hydroxymethylfurfural electrooxidation reaction (HMFEOR). The electronic modulation induced by the CoO–Co heterojunction endows CoO–Co@C/CF with a powerful catalytic ability. CoO–Co@C/CF is energetic for HER, yielding an overpotential of 69 mV at 10 mA·cm−1 and Tafel slope of 58 mV·dec−1. Meanwhile, CoO–Co@C/CF delivers an excellent electrochemical activity for the selective conversion from HMF into 2,5-furandicarboxylic acid (FDCA), achieving a conversion of 100%, FDCA yield of 99.4% and faradaic efficiency of 99.4% at the lower oxidation potential, along with an excellent cycling stability. The integrated CoO–Co@C/CF||CoO–Co@C/CF configuration actualizes the H2O–HMF-coupled electrolysis at a satisfactory cell voltage of 1.448 V at 10 mA·cm−2. This work highlights the feasibility of engineering double active sites for the coupled electrolytic system.

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Hybrid-metal hydroxyl fluoride nanosheet arrays as a bifunctional electrocatalyst for efficient overall water splitting

Abstract: Electrochemically splitting water to produce clean hydrogen fuel requires high-performance electrocatalysts. Here, we design and fabricate self-supported hybrid-metal hydroxyl fluoride [CoxFey(OH)F] nanosheet arrays on the nickel foam (NF) as an...

Cited by 15 publications

References 49 publications

Nanoneedles of Cobalt Hydroxyfluoride on N-Doped Porous Carbon as Anodes for Lithium-Ion Batteries

Nanoneedles of Cobalt Hydroxyfluoride on N-Doped Porous Carbon as Anodes for Lithium-Ion Batteries

Double Perovskite-Type (NH₄)₃Fe_xCo_1–xF₆ Electrocatalyst for Efficient Water Oxidation

CoO–Co Heterojunction Covered with Carbon Enables Highly Efficient Integration of Hydrogen Evolution and 5-Hydroxymethylfurfural Oxidation

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Hybrid-metal hydroxyl fluoride nanosheet arrays as a bifunctional electrocatalyst for efficient overall water splitting

Abstract: Electrochemically splitting water to produce clean hydrogen fuel requires high-performance electrocatalysts. Here, we design and fabricate self-supported hybrid-metal hydroxyl fluoride [CoxFey(OH)F] nanosheet arrays on the nickel foam (NF) as an...

Cited by 15 publications

References 49 publications

Nanoneedles of Cobalt Hydroxyfluoride on N-Doped Porous Carbon as Anodes for Lithium-Ion Batteries

Nanoneedles of Cobalt Hydroxyfluoride on N-Doped Porous Carbon as Anodes for Lithium-Ion Batteries

Double Perovskite-Type (NH4)3FexCo1–xF6 Electrocatalyst for Efficient Water Oxidation

CoO–Co Heterojunction Covered with Carbon Enables Highly Efficient Integration of Hydrogen Evolution and 5-Hydroxymethylfurfural Oxidation

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Double Perovskite-Type (NH₄)₃Fe_xCo_1–xF₆ Electrocatalyst for Efficient Water Oxidation