One-dimensional nickel–cobalt bimetallic phosphide nanostructures for the oxygen evolution reaction

Wang, Yue; Chang, Xin; Huang, Zexing; Fan, Jiahui; Li, Lu; Zhang, Mingyi

doi:10.1039/d3se01412f

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…The peaks of 786.37 and 801.93 eV belong to Co 2+ 2P 3/2 and Co 2+ 2P 1/2 , respectively, and the peaks located at 799.39 and 783.35 eV correspond to Co 3+ 2P 1/2 and Co 3+ 2P 3/2 , respectively. The satellite characteristic peaks of Co 2p 1/2 and Co 2p 3/2 are centered on 805.27 and 789.42 eV, respectively . The P 2p spectrum only has two peaks, with the peak at 130.67 eV belonging to the P–M bond.…”

Section: Resultsmentioning

confidence: 97%

Rational Construction of a 3D Self-Supported Electrode Based on ZIF-67 and Amorphous NiCoP for an Enhanced Oxygen Evolution Reaction

Cao,

Li,

Cao

et al. 2024

Inorg. Chem.

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The development of efficient and Earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is an urgent requirement in the field of electrochemical water splitting. The electrocatalytic performance of the OER can be greatly enhanced by the synergistic combination of zeolite imidazolate frameworks (ZIFs) and transition-metal phosphides, both of which individually exhibit promising capabilities in this regard. In this study, a novel amorphous NiCoP deposited on ZIF-67 sheets supported on Ni foam (labeled as NiCoP/ZIF-67/NF) as an OER electrocatalytic material was successfully synthesized using a simple, secure, and time-efficient two-step strategy. The experimental results demonstrate that NiCoP/ZIF-67/NF possesses a large active surface area with abundant active sites. Also, the synergistic effect and interaction between NiCoP and ZIF-67, as well as between Ni and Co within NiCoP, effectively enhance its electrochemical performance under alkaline conditions. Consequently, NiCoP/ZIF-67/NF exhibits outstanding catalytic activity for OER with an overpotential (η) of 175 mV at a current density of 10 mA cm −2 and a long-term stability over 40 h at 20 mA cm −2 in a 1.0 M KOH electrolyte. The corresponding analyses suggest that the real active sites responsible for the OER are identified as NiOOH and CoOOH species within the structure of NiCoP/ZIF-67/ NF. Additionally, the catalytic function and stability of ZIF-67 toward the OER under alkaline conditions were also briefly discussed. This work provides a novel catalytic material for the OER along with a facile strategy to fabricate superior, efficient, and noble metalfree catalysts suitable for energy-related applications.

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Section: Resultsmentioning

confidence: 97%

Rational Construction of a 3D Self-Supported Electrode Based on ZIF-67 and Amorphous NiCoP for an Enhanced Oxygen Evolution Reaction

Cao,

Li,

Cao

et al. 2024

Inorg. Chem.

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“…Electrochemical water splitting involves the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). 16 Recently, metal chalcogenides, 17–19 carbides, 20 nitrides, 21,22 phosphides, 23 high-entropy alloys, 24 rare-earth metal-based structures, 25,26 graphene–phosphide composites 11,27 and several other electrocatalysts have been fabricated for the hydrogen evolution reaction. Metal carbides and their composites are very attractive considering their high electrical conductivity, specific surface area, cost-effectiveness, Pt-like d-band electronic states and structural stability in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the characteristics and HER activity of molybdenum carbide nanosheets for hydrogen evolution reaction

Iqbal,

Idrees,

Imran

et al. 2024

Sustainable Energy Fuels

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“…Among the transition metal-based electrocatalysts, transition metal phosphides (TMPs) have been widely studied due to their abundant and inexpensive raw materials and hydrogenase-like structure, which could effectively reduce the cost of precious metal catalysts [12][13][14][15][16]. As a result, the HER and OER catalytic properties of TMPs have been thoroughly investigated, such as NiCoP nanofibers [17], Ni 2 P-CoP@NC [18], NiP x nanospheres [19], hollow urchin-like FeP [20], and carbon encapsulating MoP [21]. Among the common transition metal phosphides with better activity, cobalt-based phosphides exhibit better OER activity, while in HER, nickel-based phosphides exhibit better performance.…”

Section: Introductionmentioning

confidence: 99%

Electronic Structure Regulated Nickel-Cobalt Bimetal Phosphide Nanoneedles for Efficient Overall Water Splitting

Xu,

She,

et al. 2024

Molecules

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Transition metal phosphides (TMPs) have been widely studied for water decomposition for their monocatalytic property for anodic or cathodic reactions. However, their bifunctional catalytic activity still remains a major challenge. Herein, hexagonal nickel-cobalt bimetallic phosphide nanoneedles with 1–3 μm length and 15–30 nm diameter supported on NF (NixCo2−xP NDs/NF) with adjusted electron structure have been successfully prepared. The overall alkaline water electrolyzer composed of the optimal anode (Ni0.67Co1.33P NDs/NF) and cathode (Ni1.01Co0.99P NDs/NF) provide 100 mA cm−2 at 1.62 V. Gibbs Free Energy for reaction paths proves that the active site in the hydrogen evolution reaction (HER) is Ni and the oxygen evolution reaction (OER) is Co in NixCo2−xP, respectively. In the HER process, Co-doping can result in an apparent accumulation of charge around Ni active sites in favor of promoting HER activity of Ni sites, and ΔGH* of 0.19 eV is achieved. In the OER process, the abundant electron transfer around Co-active sites results in the excellent ability to adsorb and desorb *O and *OOH intermediates and an effectively reduced ∆GRDS of 0.37 eV. This research explains the regulation of electronic structure change on the active sites of bimetallic materials and provides an effective way to design a stable and effective electrocatalytic decomposition of alkaline water.

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One-dimensional nickel–cobalt bimetallic phosphide nanostructures for the oxygen evolution reaction

Abstract: Electrospun nickel–cobalt bimetallic phosphide nanofibers exhibited both enhanced electrocatalytic activity and excellent long-term stability for the OER.

Cited by 3 publications

References 36 publications

Rational Construction of a 3D Self-Supported Electrode Based on ZIF-67 and Amorphous NiCoP for an Enhanced Oxygen Evolution Reaction

Rational Construction of a 3D Self-Supported Electrode Based on ZIF-67 and Amorphous NiCoP for an Enhanced Oxygen Evolution Reaction

Enhancement of the characteristics and HER activity of molybdenum carbide nanosheets for hydrogen evolution reaction

Electronic Structure Regulated Nickel-Cobalt Bimetal Phosphide Nanoneedles for Efficient Overall Water Splitting

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