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Bimetallic nickel-cobalt hydrides in H₂ activation and catalytic proton reduction.

ABSTRACT: The synergism of the electronic properties of nickel and cobalt enables bimetallic NiCo complexes to process H₂. The nickel-cobalt hydride [(dppe)Ni(pdt)(H)CoCp*]⁺ ([1H]⁺ ) arising from protonation of the reduced state 1 was found to be an efficient electrocatalyst for H₂ evolution with Cl₂CHCOOH, and the oxidized [Ni(ii)Co(iii)]²⁺ form is capable of activating H₂ to produce [1H]⁺ . The features of stereodynamics, acid-base properties, redox chemistry and reactivity of these bimetallic NiCo complexes in processing H₂ are potentially related to the active site of [NiFe]-H₂ases.

SUBMITTER: Chu X

PROVIDER: S-EPMC6340403 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature

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Publications

Bimetallic nickel-cobalt hydrides in H2 activation and catalytic proton reduction.

Chu Xiaoxiao X Jin Jihao J Ming Bangrong B Pang Maofu M Yu Xin X Tung Chen-Ho CH Wang Wenguang W

Chemical science 20181030 3

The synergism of the electronic properties of nickel and cobalt enables bimetallic NiCo complexes to process H2. The nickel-cobalt hydride [(dppe)Ni(pdt)(H)CoCp*]+ ([1H]+ ) arising from protonation of the reduced state 1 was found to be an efficient electrocatalyst for H2 evolution with Cl2CHCOOH, and the oxidized [Ni(ii)Co(iii)]2+ form is capable of activating H2 to produce [1H]+ . The f ...[more]

PMID: 30746109

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Project description:There are many challenges associated with the fabrication of efficient, inexpensive, durable and very stable nonprecious metal catalysts for the hydrogen evolution reaction (HER). In this study, we have designed a facile strategy by tailoring the concentration of precursors to successfully obtain nickel-cobalt bimetallic sulfide (NiCo2S4) using a simple hydrothermal method. The morphology of the newly prepared NiCo2S4 comprised a mixture of microparticles and nanorods, which were few microns in dimension. The crystallinity of the composite sample was found to be excellent with a cubic phase. The sample that contained a higher amount of cobalt compared to nickel and produced single-phase NiCo2S4 exhibited considerably improved HER performance. The variation in the salt precursor concentration during the synthesis of a material is a simple methodology to produce a scalable platinum-free catalyst for HER. The advantageous features of the multiple active sites of cobalt in the CN-21 sample as compared to that for pristine CoS and NiS laid the foundation for the provision of abundant active edges for HER. The composite sample produced a current density of 10 mA cm-2 at an overpotential of 345 mV. Also, it exhibited a Tafel value of 60 mV dec-1, which predominantly ensured rapid charge transfer kinetics during HER. CN-21 was highly durable and stable for 30 hours. Electrochemical impedance spectroscopy showed that the charge transfer resistance was 21.88 ohms, which further validated the HER polarization curves and Tafel results. CN-21 exhibited a double layer capacitance of 4.69 μF cm-2 and a significant electrochemically active surface area of 134.0 cm2, which again supported the robust efficiency for HER. The obtained results reveal that our developed NiCo2S4 catalyst has a high density of active edges, and it is a non-noble metal catalyst for the hydrogen evolution reaction. The present findings provide an alternative strategy and an active nonprecious material for the development of energy-related applications.

Dataset Information

Bimetallic nickel-cobalt hydrides in H₂ activation and catalytic proton reduction.

Publications

Bimetallic nickel-cobalt hydrides in H<sub>2</sub> activation and catalytic proton reduction.

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