Comprehensive enhancement in electrocatalytic oxygen evolution performance of nickel and cobalt complexes derived from π-conjugated N-heterocyclic carbene ligands through carbon composite strategy

Vijayakumar, Monica; Yhobu, Zhoveta; Małecki, Jan Grzegorz; Nagaraju, Dodahhali H.; Keri, Rangappa S.; Budagumpi, Srinivasa

doi:10.1039/d3cy01732j

Catal. Sci. Technol.

2024

DOI: 10.1039/d3cy01732j

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Comprehensive enhancement in electrocatalytic oxygen evolution performance of nickel and cobalt complexes derived from π-conjugated N-heterocyclic carbene ligands through carbon composite strategy

Monica Vijayakumar,

Zhoveta Yhobu,

Jan Grzegorz Małecki

et al.

Abstract: Electrocatalysis for the oxygen evolution reaction (OER) amidst the various advanced technologies for sustainable, clean and highly efficient energy generation plays a key role. In this study, we report nickel(II)...

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Non-covalent Immobilization of Metal N-Heterocyclic Carbene Complexes onto Carbon Cloth as Bifunctional Electrodes for Overall Water Splitting in Alkaline Medium

Yhobu,

Patel,

Małecki

et al. 2024

ACS Appl. Energy Mater.

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The use of molecular complex-modified electrodes presents avenues for their rational and simplistic design to serve as efficient catalysts in emerging electrocatalytic applications. Herein, three molecular electrocatalysts, CoLBr 2 , NiLBr 2 , and PdLBr2, were synthesized from the pyridine-functionalized N-heterocyclic carbene (NHC) ligand (HLBr) and physisorbed onto CC to obtain complex-modified free-standing electrodes. These complexmodified electrodes were investigated for their hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activity in 1 M KOH. Among the complex-modified electrodes, the CoLBr 2 electrode exhibited the best HER activity with an overpotential of −255 mV vs RHE at 10 mA/cm 2 and a Tafel slope of 155 mV/dec. For the OER activity, the NiLBr 2 electrode exhibited the best performance with an overpotential of 376 mV vs RHE at 10 mA/cm 2 and a Tafel slope of 86 mV/dec. The bifunctional nature of the complex-modified free-standing CC electrodes enabled the assembly of a symmetric alkaline electrolyzer, i.e., CoLBr 2 //CoLBr2, with a cell voltage of 1.81 V at 10 mA/cm 2 . The post-stability analysis of the complex-modified electrodes revealed that the complexes possessed chemical stability despite undergoing long-term stability tests at high overpotentials. These findings authenticate the versatility of metal NHC complexes for fabricating molecularly modified free-standing electrodes for the HER, OER, and overall water splitting, paving the way for the development of sustainable energy conversion technologies.

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Non-covalent Immobilization of Metal N-Heterocyclic Carbene Complexes onto Carbon Cloth as Bifunctional Electrodes for Overall Water Splitting in Alkaline Medium

Yhobu,

Patel,

Małecki

et al. 2024

ACS Appl. Energy Mater.

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Comprehensive enhancement in electrocatalytic oxygen evolution performance of nickel and cobalt complexes derived from π-conjugated N-heterocyclic carbene ligands through carbon composite strategy

Abstract: Electrocatalysis for the oxygen evolution reaction (OER) amidst the various advanced technologies for sustainable, clean and highly efficient energy generation plays a key role. In this study, we report nickel(II)...

Cited by 1 publication

References 47 publications

Non-covalent Immobilization of Metal N-Heterocyclic Carbene Complexes onto Carbon Cloth as Bifunctional Electrodes for Overall Water Splitting in Alkaline Medium

Non-covalent Immobilization of Metal N-Heterocyclic Carbene Complexes onto Carbon Cloth as Bifunctional Electrodes for Overall Water Splitting in Alkaline Medium

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