Nickel phosphide based hydrogen producing catalyst with low overpotential and stability at high current density

Chen, Weiwu; Mishra, Ishwar Kumar; Qin, Zhaojun; Luo, Yu; Zhou, Haiqing; Zhang, Fanghao; Chen, Shuo; Wenya, Gideon Evans; Yu, Ying; Wang, Zhiming M.; Song, Hai‐Zhi; Ren, Zhifeng

doi:10.1016/j.electacta.2019.01.049

Cited by 39 publications

(18 citation statements)

References 44 publications

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“…Such a presumption is in good agreement with recent studies in which transition‐metal‐based electrocatalysts catalyze the oxidation of small molecules (e.g., 5‐hydroxymethylfufural, urea, and primary amines). In the case of Ni‐based electrocatalysts, Ni 2+ is first oxidized to generate NiOOH, which then reacts with the functional groups present to achieve the selective transformation of organic molecules . Recently, in situ Raman spectroscopy was used to evidence the generation and consumption of NiOOH during the catalytic turnover …”

Section: Resultsmentioning

confidence: 99%

Value‐Added Formate Production from Selective Methanol Oxidation as Anodic Reaction to Enhance Electrochemical Hydrogen Cogeneration

et al. 2020

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Electrolytic overall water splitting is a promising approach to produce H2, but its efficiency is severely limited by the sluggish kinetics of the oxygen evolution reaction (OER) and the low activity of current electrocatalysts. To solve these problems, in addition to the development of efficient precious‐metal catalysts, an effective strategy is proposed to replace the OER by the selective methanol oxidation reaction. Ni–Co hydroxide [NixCo1−x(OH)2] nanoarrays were obtained through a facile hydrothermal treatment as the bifunctional electrocatalysts for the co‐electrolysis of methanol/water to produce H2 and value‐added formate simultaneously. The electrocatalyst could catalyze selective methanol oxidation (≈1.32 V) with a significantly lower energy consumption (≈0.2 V less) than OER. Importantly, methanol was transformed exclusively to value‐added formate with a high Faradaic efficiency (selectivity) close to 100 %. Specifically, a cell voltage of only approximately 1.5 V was required to generate a current density of 10 mA cm−2. Furthermore, the Ni0.33Co0.67(OH)2/Ni foam nanoneedle arrays presented an outstanding stability for overall co‐electrolysis.

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Section: Resultsmentioning

confidence: 99%

Value‐Added Formate Production from Selective Methanol Oxidation as Anodic Reaction to Enhance Electrochemical Hydrogen Cogeneration

et al. 2020

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“…1 (e-f), the highly open and ultrathin Co x P@NiCo-LDH catalyst layer construct a hierarchical hetero-architecture, which could expose rich active sites and synergy effect. The phosphorus doping into cobalt crystal lattices also enhances the reaction kinetics of electrocatalysts since the P atoms with more electronegativity can grab electrons from metal atoms, and act as Lewis base to work with positively charged proton through the mass transfer in the nanostructure [50][51][52][53] . As shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

Co P@NiCo-LDH heteronanosheet arrays as efficient bifunctional electrocatalysts for co-generation of value-added formate and hydrogen with less-energy consumption

Deng

Liang

et al. 2020

Journal of Energy Chemistry

102

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“…Moreover, Ni 5 P 4 exhibits diffraction peaks at 15.05, 16.1, 22.1, 28.6, 30.3, 31.4, 34.5, 36.05, 49.7, and 52.9° corresponding to the planes (100), (002), (102), (103), (200), (201), (202), (104), (006), and (214) with a hexagonal structure (JCPDS file no. 18-0883), respectively . The intense peaks of Ni x P y indicate that the samples were well crystalline.…”

Section: Resultsmentioning

confidence: 95%

“…18-0883), respectively. 35 The intense peaks of Ni x P y indicate that the samples were well crystalline. Likewise, in Figure 1b, the ZnO catalyst exhibits diffraction peaks at 31.7, 34.4, 36.2, 47.5, 56.6, 62.8, 66.3, 67.9, 69.1, 72.5, and 76.9°corresponding to the planes (100), (002), (101), (102), (110), (103), ( 200), (112), (201), (204), and (202), respectively, which is well correlated with the hexagonal wurtzite structure (JCPDS file no.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Aggrandizing the Photoactivity of ZnO Nanorods toward N₂ Reduction and H₂ Evolution through Facile In Situ Coupling with Ni_xP_y

Ray

Sultana

Tripathy

et al. 2021

ACS Sustainable Chem. Eng.

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The photocatalytic water and nitrogen reduction in the presence of solar light gives rise to an alternative route for sustainable green energy. This novel approach can resolve the difficulty of greenhouse gas emanation from fossil fuels and global warming and energy crisis. Making headway for developing more robust and efficient photocatalytic systems still remains an enormous challenge toward industrial usage on a large scale. To meet this challenge, herein we report hydrothermally prepared ZnO nanorods (NRs) coupled with nickel phosphide (Ni x P y ) via a lowtemperature phosphidation method. Ni x P y acts as a robust cocatalyst, which increases the visible light absorption efficacy and photocatalytic performance of ZnO NRs toward nitrogen reduction and hydrogen evolution. The nanorod morphology of the ZnO-Ni x P y hybrid is revealed by transmission electron microscopy (TEM) analysis while the formation of the Ni−P moiety and its interaction with ZnO NRs are verified by X-ray photoelectron spectroscopy (XPS) analysis. Besides, the excellent photogenerated charge separation and transfer efficiency are further confirmed using photoluminescence (PL), electrochemical impedance spectroscopy (EIS), and transient analysis, which are the main aspects for activity enhancement in the nickel phosphide-modified ZnO NRs. The optimized ZnO-Ni x P y nanocomposite exhibits an outstanding ammonia production rate of 2304.43 μmol h −1 g −1 without using any organic scavenger or precious noble metal. On the other hand, this catalyst also exhibits stupendous performance with a H 2 generation rate of 10 481 μmol h −1 g −1 using methanol as a hole scavenger. This magnificent result can be attributed to (i) Ni−P sites acting as active reaction sites for nitrogen and proton adsorption and activation, (ii) efficacious charge carrier segregation, and (iii) proficient charge transfer to the surface of nickel phosphide. This finding offers a new avenue for developing noble metalfree phosphide-based hybrids toward highly efficient photocatalytic reactions.

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Nickel phosphide based hydrogen producing catalyst with low overpotential and stability at high current density

Cited by 39 publications

References 44 publications

Value‐Added Formate Production from Selective Methanol Oxidation as Anodic Reaction to Enhance Electrochemical Hydrogen Cogeneration

Value‐Added Formate Production from Selective Methanol Oxidation as Anodic Reaction to Enhance Electrochemical Hydrogen Cogeneration

Co P@NiCo-LDH heteronanosheet arrays as efficient bifunctional electrocatalysts for co-generation of value-added formate and hydrogen with less-energy consumption

Aggrandizing the Photoactivity of ZnO Nanorods toward N₂ Reduction and H₂ Evolution through Facile In Situ Coupling with Ni_xP_y

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Nickel phosphide based hydrogen producing catalyst with low overpotential and stability at high current density

Cited by 39 publications

References 44 publications

Value‐Added Formate Production from Selective Methanol Oxidation as Anodic Reaction to Enhance Electrochemical Hydrogen Cogeneration

Value‐Added Formate Production from Selective Methanol Oxidation as Anodic Reaction to Enhance Electrochemical Hydrogen Cogeneration

Co P@NiCo-LDH heteronanosheet arrays as efficient bifunctional electrocatalysts for co-generation of value-added formate and hydrogen with less-energy consumption

Aggrandizing the Photoactivity of ZnO Nanorods toward N2 Reduction and H2 Evolution through Facile In Situ Coupling with NixPy

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Aggrandizing the Photoactivity of ZnO Nanorods toward N₂ Reduction and H₂ Evolution through Facile In Situ Coupling with Ni_xP_y