Optimizing the Synergistic Effect of Co and Fe for Efficient and Durable Oxygen Evolution under Alkaline Conditions

Han, Sanghwi; Kim, Sungjun; Kim, Tae Hoon; Lee, Jang Yong; Yoon, Jeyong

doi:10.1021/acsami.4c07058

ACS Appl. Mater. Interfaces

2024

DOI: 10.1021/acsami.4c07058

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Optimizing the Synergistic Effect of Co and Fe for Efficient and Durable Oxygen Evolution under Alkaline Conditions

Sanghwi Han,

Sungjun Kim,

Tae Hoon Kim

et al.

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Cited by 4 publications

References 63 publications

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Coordination Tuning of FeNi‐HMT Frameworks Derived Effective Hybrid Catalysts for Water Oxidation

Wang,

Fu,

et al. 2024

ChemSusChem

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FeNi‐based hybrid materials are promising oxygen evolution reaction (OER) catalysts for water electrolysis in hydrogen generation. In this work, the coordination tuning of FeNi‐HMT frameworks was achieved by simply changing the Fe/Ni ratios using hexamethylenetetramine (HMT) as an organic ligand, and the derived hybrid FeNi catalysts with varied compositions were probed for OER. Incorporating varying amounts of Fe3+ by adjusting the Ni/Fe ratio results in different metal‐organic framework (MOF) structures, and higher Fe feed leads to the formation of amorphous structures due to the coordination structure destruction from the weaker coordination capacity of Fe3+ compared to Ni2+ combining with the tertiary amine ligand. Among them, the FeNi‐HMT (with the Fe/Ni molar ratio of 1/1) derived catalyst, consisting of Fe0.36Ni0.64 alloy/Ni0.4Fe2.6O4 spinel oxide heterostructures supported by graphitized carbon matrix, exhibits the highest OER performance. The unique structure facilitates significant electron transfer at the alloy/spinel interface due to the large work function difference between each phase. This strong electronic effect downshifts the d‐band center of the catalyst and optimizes the binding energies to the crucial oxygenated intermediates, thereby promoting the OER kinetics. This work highlights the importance of the coordination tuning of FeNi‐HMT frameworks for highly efficient catalyst development.

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Coordination Tuning of FeNi‐HMT Frameworks Derived Effective Hybrid Catalysts for Water Oxidation

Wang,

Fu,

et al. 2024

ChemSusChem

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Intermittent polarity inversion of stainless-steel paired electrodes for efficient and durable water electrolysis

Han,

Ryu,

Yoon

2024

Chemical Engineering Journal

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Enhanced Oxygen Evolution Reaction Performance of NiMoO₄/Carbon Paper Electrocatalysts in Anion Exchange Membrane Water Electrolysis by Atmospheric-Pressure Plasma Jet Treatment

Chueh,

Yu,

et al. 2024

Langmuir

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NiMoO 4 was grown on carbon paper (CP) by a hydrothermal method. A rapid and high-temperature atmosphericpressure plasma jet (APPJ) process was used to generate more oxygen-deficient NiMoO 4 on the CP surface to serve as an electrode material for the oxygen evolution reaction (OER). After 60 s of APPJ treatment, the overpotential of the electrode at 100 mA/cm 2 decreased to 790 mV and that at 10 mA/cm 2 decreased to 368 mV. Additionally, the charge transfer resistance decreased from 2.8 to 1.2 Ω, indicating that APPJ treatment effectively reduced the electrode overpotential and impedance. The effect of NiMoO 4 /CP/APPJ-60 s on the anion exchange membrane water electrolysis (AEMWE) system was also tested. At a system temperature of 70 °C and current density of 100 mA/cm 2 , the energy efficiency reached 95.1%, and the specific energy consumption decreased from 4.02 to 3.83 kWh/m 3 . These results demonstrate that the APPJ-treated NiMoO 4 /CP electrode can effectively enhance the OER performance in water electrolysis and improve the energy efficiency of the AEMWE system. This approach shows promise in replacing precious metal electrodes, thereby potentially reducing the cost and providing an environmentally friendly alternative.

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Optimizing the Synergistic Effect of Co and Fe for Efficient and Durable Oxygen Evolution under Alkaline Conditions

Cited by 4 publications

References 63 publications

Coordination Tuning of FeNi‐HMT Frameworks Derived Effective Hybrid Catalysts for Water Oxidation

Coordination Tuning of FeNi‐HMT Frameworks Derived Effective Hybrid Catalysts for Water Oxidation

Intermittent polarity inversion of stainless-steel paired electrodes for efficient and durable water electrolysis

Enhanced Oxygen Evolution Reaction Performance of NiMoO₄/Carbon Paper Electrocatalysts in Anion Exchange Membrane Water Electrolysis by Atmospheric-Pressure Plasma Jet Treatment

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Optimizing the Synergistic Effect of Co and Fe for Efficient and Durable Oxygen Evolution under Alkaline Conditions

Cited by 4 publications

References 63 publications

Coordination Tuning of FeNi‐HMT Frameworks Derived Effective Hybrid Catalysts for Water Oxidation

Coordination Tuning of FeNi‐HMT Frameworks Derived Effective Hybrid Catalysts for Water Oxidation

Intermittent polarity inversion of stainless-steel paired electrodes for efficient and durable water electrolysis

Enhanced Oxygen Evolution Reaction Performance of NiMoO4/Carbon Paper Electrocatalysts in Anion Exchange Membrane Water Electrolysis by Atmospheric-Pressure Plasma Jet Treatment

Contact Info

Product

Resources

About

Enhanced Oxygen Evolution Reaction Performance of NiMoO₄/Carbon Paper Electrocatalysts in Anion Exchange Membrane Water Electrolysis by Atmospheric-Pressure Plasma Jet Treatment