Co2P/CoP hybrid as a reversible electrocatalyst for hydrogen oxidation/evolution reactions in alkaline medium

Huang, Guoju; Liang, Wanli; Wu, Yinlong; Li, Jiawang; Jin, Yan; Zeng, Hongbin; Zhang, Hao; Xie, Fangyan; Chen, Jian; Wang, Nan; Meng, Hui

doi:10.1016/j.jcat.2020.07.023

Cited by 68 publications

(27 citation statements)

References 48 publications

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“…For example, the HOR activity on noble metals (e.g., Pt, Pd, and Ir) drops approximately 100-fold when the electrolyte switches from acid to base (4,(6)(7)(8). Attempting to address these limitations, several strategies have been developed for low-cost and high-performance alkaline HOR electrocatalysts, such as alloying two metals (9)(10)(11)(12), preparing core-shell structures (13)(14)(15), engineering hybrid nanostructures (8,16,17), tuning crystalline structures of metals (18,19), among others (20). Despite the great progress mentioned above in promoting the HOR activity, it is still a great challenge to precisely design cost-effective electrocatalysts with highly efficient active sites for alkaline HOR.…”

Section: Introductionmentioning

confidence: 99%

Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

et al. 2022

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Anion exchange membrane fuel cells are limited by the slow kinetics of alkaline hydrogen oxidation reaction (HOR). Here, we establish HOR catalytic activities of single-atom and diatomic sites as a function of *H and *OH binding energies to screen the optimal active sites for the HOR. As a result, the Ru-Ni diatomic one is identified as the best active center. Guided by the theoretical finding, we subsequently synthesize a catalyst with Ru-Ni diatomic sites supported on N-doped porous carbon, which exhibits excellent catalytic activity, CO tolerance, and stability for alkaline HOR and is also superior to single-site counterparts. In situ scanning electrochemical microscopy study validates the HOR activity resulting from the Ru-Ni diatomic sites. Furthermore, in situ x-ray absorption spectroscopy and computational studies unveil a synergistic interaction between Ru and Ni to promote the molecular H 2 dissociation and strengthen OH adsorption at the diatomic sites, and thus enhance the kinetics of HOR.

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Section: Introductionmentioning

confidence: 99%

Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

et al. 2022

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“…Hydrogen evolution reaction (HER) of water electrolysis can produce H2 using electricity directly from renewable solar, wind and tide powers [8]. Hydrogen oxidation reaction (HOR) in fuel cells can transform the chemical energy in H2 to electricity [9,10]. These two reactions realize the hydrogen economy, and rely on efficient electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

V-doped Ni3N/Ni heterostructure with engineered interfaces as a bifunctional hydrogen electrocatalyst in alkaline solution: Simultaneously improving water dissociation and hydrogen adsorption

et al. 2021

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Alkali-water electrolyzers and hydroxide exchange membrane fuel cells are emerging as promising technologies to realize hydrogen economy. Developing cost-effective electrode materials with high activities towards corresponding hydrogen evolution (HER) and oxidation (HOR) reactions plays a crucial role in commercial hydrogen production and utilization. Herein, we fabricated a V-doped Ni 3 N/Ni heterostructure (V-Ni 3 N/Ni) through a controlled nitridation treatment on a V-incorporated nickel hydroxide precursor. The resultant catalyst exhibits comparable catalytic activity and durability to commercial Pt/C in terms of both HER (a low overpotential of 44 mV at the current density of 10 mA•cm −2 ) and HOR (a high current density of 1.54 mA•cm −2 at 0.1 V versus reversible hydrogen electrode) under alkaline conditions. The superior activity of V-Ni 3 N/Ni grown on different substrates further implies its intrinsic performance. Density functional theory (DFT) calculations reveal that the coupled metallic Ni and doped V can promote the water adsorption, accelerate the Volmer step of alkaline HER, as well as optimize the adsorption and desorption of hydrogen intermediate (H * ) to reach a balanced ∆G H* value.

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“…To further demonstrate the increased intrinsic activity of HER, electrochemical impedance spectroscopy tests were performed. The Nyquist plots of these electrode materials and the corresponding results of the equivalent circuit fitting through the dual constant phase element (CPE) model are given in Figure c and Table S1. , In the dual CPE model, solution resistance ( R s ) is the resistance between the working electrode and the reference electrode, R1 and CPE1 are potential-independent and related to surface porosity, while resistance of charge transfer ( R ct ) and CPE2 are potential-dependent and related to HER. − The R ct values of MoO 2 /Ni@NF and Ni@NF were 1.687 and 3.302 Ω, respectively, reflecting that MoO 2 /Ni@NF can exhibit better electron transport in HER …”

Section: Results and Discussionmentioning

confidence: 99%

“…The method of electrochemical measurements has been reported in our previous work. 48 It is worth noting that in this work, all samples were cut into 5.0 mm × 5.0 mm for testing. What is more, in the HOR performance test, every 1 mV was recorded at −10−20 mV, every 5 mV was recorded at 20−150 mV, and then every 10 mV was recorded at higher potentials.…”

Section: Discussionmentioning

confidence: 99%

Electron Density Modulation of MoO₂/Ni to Produce Superior Hydrogen Evolution and Oxidation Activities

Liang

Dong

et al. 2021

ACS Appl. Mater. Interfaces

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Hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) have aroused great interest, but the high price of platinum group metals (PGMs) limits their development.The electronic reconstruction at the interface of a heterostructure is a promising strategy to enhance their catalytic performance. Here, MoO 2 /Ni heterostructure was synthesized to provide effective HER in an alkaline electrolyte and exhibit excellent HOR performance. Theoretical and experimental analyses prove that the electron density around the Ni atom is reduced. The electron density modulation optimizes the hydrogen adsorption and hydroxide adsorption free energy, which can effectively improve the activity of both HER and HOR. Accordingly, the prepared MoO 2 /Ni@NF catalyst reveals robust HER activity (η 10 = 50.48 mV) and HOR activity (j 0 = ∼1.21 mA cm −2 ). This work demonstrates an effective method to design heterostructure interfaces and tailor the surface electronic structure to improve HER/HOR performance.

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Co2P/CoP hybrid as a reversible electrocatalyst for hydrogen oxidation/evolution reactions in alkaline medium

Cited by 68 publications

References 48 publications

Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

V-doped Ni3N/Ni heterostructure with engineered interfaces as a bifunctional hydrogen electrocatalyst in alkaline solution: Simultaneously improving water dissociation and hydrogen adsorption

Electron Density Modulation of MoO₂/Ni to Produce Superior Hydrogen Evolution and Oxidation Activities

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Co2P/CoP hybrid as a reversible electrocatalyst for hydrogen oxidation/evolution reactions in alkaline medium

Cited by 68 publications

References 48 publications

Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

Design of Ru-Ni diatomic sites for efficient alkaline hydrogen oxidation

V-doped Ni3N/Ni heterostructure with engineered interfaces as a bifunctional hydrogen electrocatalyst in alkaline solution: Simultaneously improving water dissociation and hydrogen adsorption

Electron Density Modulation of MoO2/Ni to Produce Superior Hydrogen Evolution and Oxidation Activities

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Electron Density Modulation of MoO₂/Ni to Produce Superior Hydrogen Evolution and Oxidation Activities