Crystalline/amorphous nickel sulfide interface for high current density in alkaline HER: surface and volume confinement matters!

Sagayaraj, Prince J. J.; Sekar, Karthikeyan

doi:10.1039/d4cc01782j

Chem. Commun.

2024

DOI: 10.1039/d4cc01782j

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Crystalline/amorphous nickel sulfide interface for high current density in alkaline HER: surface and volume confinement matters!

Prince J. J. Sagayaraj,

Karthikeyan Sekar

Abstract: In this work, we demonstrated a interface on porous nickel foam (NN) between cystalline nickel sulfide and amorphous nickel sulfide (NNS/NNSx) adapting simple hydrothermal and facile electrodeposition process, respectively. The...

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Cited by 3 publications

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Emphasis on the transition metal sulfides and their polymer composites as potential electrodes for supercapacitor applications

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Alamara,

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Emphasis on the transition metal sulfides and their polymer composites as potential electrodes for supercapacitor applications

Raghavendra,

Alamara,

Al-Haik

et al. 2024

Journal of Energy Storage

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Deep eutectic solvent-assisted hydrothermal synthesis of Cu/Cl-doped TiO₂ photocatalyst for hydrogen production

Wang,

Niyazi,

Liu

et al. 2025

Journal of Alloys and Compounds

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The Construction of Face-to-Face Combination between NiFe-layered Double Hydroxide Nanosheets and Monolayer rGO for Efficient Water Splitting and Oxygen Reduction

Liu,

Yang,

Xue

et al. 2024

ACS Appl. Mater. Interfaces

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Developing cost-effective and efficient electrocatalysts is essential for advancing a green energy future. Herein, a NiFelayered double hydroxide loaded on reduced graphene oxide (NiFe-LDHs@rGO) hybrid was synthesized using a straightforward three-step process involving exfoliation tearing, electrostatic self-assembly, and chemical reduction. The face-to-face packing and ultrathin exfoliation enable strong heterogeneous interactions, fully harnessing the potential of these complementary twodimensional counterparts. Consequently, the resultant catalyst displays outstanding oxygen evolution reaction (OER) catalytic activity and stability, whose overpotential is as low as 241 mV at 30 mA cm −2 and 255 mV at 50 mA cm −2 with a low Tafel slope of 62.1 mV dec −1 . Both the experimental results and density functional theory (DFT) calculations reveal that the face-to-face assembly strengthens the electronic interactions between NiFe-LDHs and rGO, which effectively modulates the d-band center of Ni and Fesites and improves the reaction kinetics for OER. Moreover, the resultant NiFe-LDHs@rGO hybrids exhibit excellent multifunctional catalytic performance. Its hydrogen evolution reaction (HER) activity is endowed by Fe-site of NiFe-LDHs and defect states rGO and achieves a low voltage of 1.68 V to drive a current density of 10 mA cm −2 for overall water splitting. The faceto-face heteroassembly also imparts NiFe-LDHs@rGO with superior oxygen reduction reaction (ORR) activity, with a half-wave potential of 0.70 V and a limiting current density of 4.2 mA cm −2 . Its ORR primarily follows a four-electron transfer pathway with a minor contribution from a two-electron process. This study establishes the groundwork for optimizing two-dimensional heterogeneous interfaces in LDH@carbon-based materials for advanced energy conversion.

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Crystalline/amorphous nickel sulfide interface for high current density in alkaline HER: surface and volume confinement matters!

Abstract: In this work, we demonstrated a interface on porous nickel foam (NN) between cystalline nickel sulfide and amorphous nickel sulfide (NNS/NNSx) adapting simple hydrothermal and facile electrodeposition process, respectively. The...

Cited by 3 publications

References 14 publications

Emphasis on the transition metal sulfides and their polymer composites as potential electrodes for supercapacitor applications

Emphasis on the transition metal sulfides and their polymer composites as potential electrodes for supercapacitor applications

Deep eutectic solvent-assisted hydrothermal synthesis of Cu/Cl-doped TiO₂ photocatalyst for hydrogen production

The Construction of Face-to-Face Combination between NiFe-layered Double Hydroxide Nanosheets and Monolayer rGO for Efficient Water Splitting and Oxygen Reduction

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