<i>In situ</i> growth of Fe(<scp>ii</scp>)-MOF-74 nanoarrays on nickel foam as an efficient electrocatalytic electrode for water oxidation: a mechanistic study on valence engineering

Wang, Qijun; Wei, Feifei; Zhang, Zheye; Xiao, Junwu; Zhao, Xuezhu; Xiao, Fei; Wang, Hairen; Wang, Shuai

doi:10.1039/c9cc05087f

Cited by 29 publications

(23 citation statements)

References 28 publications

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“…Figure a shows the high resolution XPS spectrum of Fe 2p. Two peaks centered at 711.2 and 724.4 eV with the corresponding satellite peaks at 716.1 and 730.1 eV are attributed to Fe 2+ , implying the presence of Fe 2+ in the Co,Fe-MOF-74/Co/CC-2. Furthermore, the successful integration of Fe into the Co-MOF/Co/CC also caused the binding energy change of Co 2p.…”

Section: Resultsmentioning

confidence: 93%

“…The characteristic bands related to undissociated hydroxyl and carboxylic acid groups of the ligand cannot be detected in the final products, which reflect the deprotonated effect in MOF-74 and a strong interaction between the ligand and the metal ions. The similar FT-IR spectra of the Co,Fe-MOF-74/Co/CC and Co-MOF-74/Co/CC reveal the same coordinated structure, , which is confirmed by Raman spectroscopy. As shown in Figure b, two products also display similar Raman spectra.…”

Section: Resultsmentioning

confidence: 99%

“…The ν(C–O) vibration peak appears at 1286 cm –1 owing to the deprotonation of the hydroxyl group after coordination. The peaks at 820 and 405 cm –1 are assigned to benzene ring C–H bending modes and metal–oxygen bond vibration, respectively. ,, …”

Section: Resultsmentioning

confidence: 99%

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Hierarchical Co,Fe-MOF-74/Co/Carbon Cloth Hybrid Electrode: Simple Construction and Enhanced Catalytic Performance in Full Water Splitting

Zha

Liu

et al. 2020

ACS Sustainable Chem. Eng.

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Metal−organic frameworks (MOFs) have attracted much interest in electrocatalysis as promising catalysts in recent years. However, it still remains a challenge to directly use MOF-based materials as bifunctional electrocatalysts for overall water splitting. Herein, a hierarchical Co,Fe-MOF-74/Co/carbon cloth (CC) threelayer hybrid electrode is synthesized by a simple electrochemical deposition technology with subsequent solvothermal treatment. Electrochemical performance investigations show that the asconstructed Co,Fe-MOF-74/Co/CC electrode exhibits impressive electrocatalytic activity for full water splitting, which only requires a low overpotential of 226 mV@20 mA cm −2 for the oxygen evolution reaction (OER) and 94 mV@−10 mA cm −2 for the hydrogen evolution reaction (HER), respectively. Employing the as-constructed electrode as the anode and cathode in a two-electrode setup simultaneously, only 1.65 V of the voltage is needed to deliver the current density of 20 mA cm −2 . The above excellent electrochemical performances should be attributed to the specific architecture, the synergistic effect of the Co and Fe species, and the superhydrophilic surface of the catalyst. More importantly, further investigations uncover that metal hydroxides and oxyhydroxides produced in situ during electrochemical tests are the veritable active species, which promote the high catalytic activity of the present catalyst.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Hierarchical Co,Fe-MOF-74/Co/Carbon Cloth Hybrid Electrode: Simple Construction and Enhanced Catalytic Performance in Full Water Splitting

Zha

Liu

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…The pressure from the exhaustion of fossil fuels forces human beings to search new sustainable and more efficient energy resources to support rapid development of our society. [1][2][3][4][5][6][7][8] Currently, many next-generation renewable energy devices have been discovered to replace fossil fuels in a clean way. Electrochemical energy conversion and storage technologies are considered as promising ways to become clean and sustainable energy devices.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in vacancy engineering of metal‐organic frameworks and their derivatives for electrocatalysis

Gao

et al. 2021

SusMat

261

115

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The efficient electrocatalysis plays the key role in the development of electrochemical energy conversion technologies to alleviate energy crisis. Given their multiple active sites and large specific surface areas as electrocatalysts, metalorganic frameworks (MOFs) and their derivatives have attracted considerable interests in recent years. Specially, exploring the roles of the enhanced active sites in MOFs and their derivatives is significant for understanding and developing new effective electrocatalysts. Recently, the vital role of vacancies has been proven to promote electrocatalytic processes (such as H 2 or O 2 evolution reactions, O 2 reduction reactions, and N 2 reduction reactions). In order to in-depth exploring the effect of vacancies in electrocatalysts, the vacancies classification, synthetic strategy, and the recent development of various vacancies in MOFs and their derivatives for electrocatalysis are reviewed. Also, the perspectives on the challenges and opportunities of vacancies in MOFs and their derivatives for electrocatalysis are presented.

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A Kinetic Control Strategy for One‐Pot Synthesis of Efficient Bimetallic Metal‐Organic Framework/Layered Double Hydroxide Heterojunction Oxygen Evolution Electrocatalysts

Wang

Huang

et al. 2023

Adv Funct Materials

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Heterojunction materials are promising candidates for oxygen evolution reaction (OER) electrocatalysts to break the linear scaling relationship and lower the reaction barrier. However, the application of heterojunction materials is always hindered by the complicated multistep synthetic procedures which bring cost, complexity, and reproducibility issues. Herein, a strategy of kinetic controlled synthesis is developed to achieve the one-pot formation of bimetallic metal-organic framework (MOF)/layered double hydroxide (LDH) heterojunction electrodes as highly efficient OER electrocatalysts. The heterojunction electrodes present hierarchical structures with highly porous NiFe-LDH nanosheet networks vertically grown on the surface of NiFe-MOF-74 microprisms, promoting fast mass transport and high exposure of active sites. The strong interactions at the MOF/LDH heterojunction interfaces contribute to the outstanding OER activity surpassing the state-of-art RuO 2 OER catalysts. The MOF/LDH heterojunction electrode exhibits an ultralow overpotential of only 159.7 mV to reach the current density of 10 mA cm −2 , and yields large current densities at small overpotential (100 mA cm −2 at 230.2 mV and 1000 mA cm −2 at 284.3 mV) with long-term durability. This study presents an innovative approach to construct heterojunction materials with simple onestep synthesis, offering a promising pathway for high-efficiency electrocatalyst development.

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In situ growth of Fe(ii)-MOF-74 nanoarrays on nickel foam as an efficient electrocatalytic electrode for water oxidation: a mechanistic study on valence engineering

Abstract: DFT results first demonstrate that varying the metal valence can tune the stable intrinsic electronic structure of MOF, different valence Fe(ii) and Fe(iii)-MOF-74 nanoarrrays on nickel foam are further synthesized as electrode for water oxidation.

Cited by 29 publications

References 28 publications

Hierarchical Co,Fe-MOF-74/Co/Carbon Cloth Hybrid Electrode: Simple Construction and Enhanced Catalytic Performance in Full Water Splitting

Hierarchical Co,Fe-MOF-74/Co/Carbon Cloth Hybrid Electrode: Simple Construction and Enhanced Catalytic Performance in Full Water Splitting

Recent advances in vacancy engineering of metal‐organic frameworks and their derivatives for electrocatalysis

A Kinetic Control Strategy for One‐Pot Synthesis of Efficient Bimetallic Metal‐Organic Framework/Layered Double Hydroxide Heterojunction Oxygen Evolution Electrocatalysts

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