Electrodeposited amorphous cobalt-nickel-phosphide-derived films as catalysts for electrochemical overall water splitting

Chai, Le; Liu, Shilin; Pei, Shaotong; Wang, Chao

doi:10.1016/j.cej.2021.129686

Cited by 80 publications

(32 citation statements)

References 53 publications

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“…For Ni 2 P-H and Ni 2 P-L, the Ni 2p 3/2 peaks can be deconvoluted into two peaks at ∼853 and 856 eV, corresponding to Ni 0 (Ni–P and Ni–Ni bonds) and Ni 2+ caused by the surface oxidation, respectively. , For Ni-P-a, the peak for Ni 0 is almost invisible. This is often observed for the amorphous nickel phosphides that are prone to be oxidized at the surface . The shift to lower binding energies of the Ni 2p 3/2 peak with an increased amount of P 4 during synthesis indicates that possible electron interaction exists between the Ni sites and P sites.…”

Section: Resultsmentioning

confidence: 82%

“…This is often observed for the amorphous nickel phosphides that are prone to be oxidized at the surface. 32 The shift to lower binding energies of the Ni 2p 3/2 peak with an increased amount of P 4 during synthesis indicates that possible electron interaction exists between the Ni sites and P sites. The high-resolution P 2p spectra (Figure 3c) exhibit two peaks at 130.1 and 134.4 eV, which correspond to the M−P bond in the phosphides and the O−P bond at the surface due to oxidation, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

“…Ni 2 P-L/Ni foam shows higher current per active Ni site than Ni 2 P-H/Ni foam and Ni-P-a/Ni foam at 1.5 V. This indicates that the amorphous/crystalline heterostructures of nickel phosphides are desirable toward WOR. The turn-over frequency (TOF) values of Ni-P/Ni foam are calculated based on the following equation where F is the Faraday constant. The TOF values at 320 mV overpotential are summarized in Table , with Ni 2 P-L/Ni foam showing the highest value of TOF (0.0292 s –1 ), which also suggests the highest activity per active Ni site.…”

Section: Resultsmentioning

confidence: 99%

“…Obvious Ni 2+/3+ redox peaks (Figure 4c) are observed in cyclic voltammetry (CV), and the integrated charge under the Ni 2+/3+ oxidation peak is used to estimate the number of electrochemically active Ni atoms (n Ni ). 32 BET . This indicates that the n Ni per BET surface area decrease with increased Ni 2 P crystallinity and that the amorphous phase could expose higher amounts of active sites on the electrode surface.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Amorphous/Crystalline Heterostructured Nickel Phosphide Nanospheres for Electrocatalytic Water and Methanol Oxidation Reactions

et al. 2021

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Designing electrocatalysts for the water oxidation reaction (WOR) and the methanol oxidation reaction (MOR) using earth-abundant elements is crucial for the development of water electrolyzers and direct methanol fuel cells. We report the synthesis of nickel phosphide nanospheres with different crystallinities (Ni 2 P-H, Ni 2 P-L, and Ni-P-a) by reacting Ni-based metal−organic frameworks and P 4 solvothermally. All the nickel phosphide nanospheres synthesized are active toward WOR and MOR, and Ni 2 P-L, with amorphous/crystalline heterostructures, shows the best electrocatalytic performance. For WOR, the overpotential at 10 mA cm −2 for Ni 2 P-L on Ni foam is 300 mV in 1 M KOH (loading 0.8 mg Ni+P cm −2 ), and the Tafel slope is ∼86.4 mV dec −1 . For MOR, Ni 2 P-L on carbon paper has the highest current density of 427.0 mA mg −1 at 1.74 V RHE in 1 M KOH + 0.5 M CH 3 OH. Structural characterizations and electrochemical kinetic studies suggest that the high electrocatalytic activity of Ni 2 P-L originates from the abundant electrochemically active sites exposed owing to the amorphous phase and the electron interaction between Ni and P, which tunes the WOR intermediate (OH*) adsorption energy. Conversion of phosphides to (oxy)hydroxides at the surface is also observed after long-term WOR.

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Section: Resultsmentioning

confidence: 82%

Section: ■ Results and Discussionmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Amorphous/Crystalline Heterostructured Nickel Phosphide Nanospheres for Electrocatalytic Water and Methanol Oxidation Reactions

et al. 2021

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“…[133][134][135] For example, electrodeposition with CV allowed the formation of an amorphous Co-Ni-P catalyst on Ni foam. [132] The number of cycles was varied to control the amount of deposited Co-Ni-P film. Its excellent HER performance mainly originates from the electronic interaction between binary metals and the large ECSA of the unique morphology.…”

Section: 22mentioning

confidence: 99%

Electrodeposition: An efficient method to fabricate self‐supported electrodes for electrochemical energy conversion systems

Kim

Han

et al. 2022

Exploration

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The development of electrocatalysts for energy conversion systems is essential for alleviating environmental problems and producing useful energy sources as alternatives to fossil fuels. Improving the catalytic performance and stability of electrocatalysts is a major challenge in the development of energy conversion systems. Moreover, understanding their electrode structure is important for enhancing the energy efficiency. Recently, binder-free self-supported electrodes have been investigated because the seamless contact between the electrocatalyst and substrate minimizes the contact resistance as well as facilitates fast charge transfer at the catalyst/substrate interface and high catalyst utilization. Electrodeposition is an effective and facile method for fabricating self-supported electrodes in aqueous solutions under mild conditions. Facile fabrication without a polymer binder and controlability of the compositional and morphological properties of the electrocatalyst make electrodeposition methods suitable for enhancing the performance of energy conversion systems. Herein, we summarize recent research on self-supported electrodes fabricated by electrodeposition for energy conversion reactions, particularly focusing on cathodic reactions of electrolyzer system such as hydrogen evolution, electrochemical CO 2 reduction, and electrochemical N 2 reduction reactions. The deposition conditions, morphological and compositional properties, and catalytic performance of the electrocatalyst are reviewed. Finally, the prospective directions of electrocatalyst development for energy conversion systems are discussed.

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Atomic Heterointerface Engineering of Ni₂P‐NiSe₂ Nanosheets Coupled ZnP‐Based Arrays for High‐Efficiency Solar‐Assisted Water Splitting

Chang

Tran

Wang

et al. 2022

Adv Funct Materials

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In this study, heterogeneous nickel phosphide‐nickel selenide (Ni2P‐NiSe2) nanosheets are constructed to coat zinc phosphide‐based nanorods (ZnP NRs) under a unique core@shell architecture, which acts as a highly active multifunctional catalyst toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The catalyst exhibits an overpotential of 79 mV at 10 mA cm–2 for HER and 326 mV at 100 mA cm–2 for OER in freshwater under an alkaline condition. The formation of an open 3D channel architecture derived from highly conductive ZnP@Ni2P‐NiSe2 nanorods attached nickel foam generates more exposed active sites and promotes fast mass transport. In addition, density functional theory study reveals a synergistic effect between Ni2P and NiSe2 phase to reduce adsorption free energy and increase the electronic conductivity, thereby accelerating the catalytic reaction kinetics. An electrolyzer of the ZnP@Ni2P‐NiSe2(+,‐) requires only cell voltages of 1.54 V (1.43 V) and 1.51 V (1.44 V) to deliver 10 mA cm–2 in freshwater and mimic seawater at 25 °C (75 °C), respectively, along with prospective long‐term stability. Furthermore, the solar energy‐assisted water splitting process demonstrates a solar‐to‐hydrogen efficiency of 19.75%, implying that the catalyst is an effective and low‐cost candidate for water splitting.

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Electrodeposited amorphous cobalt-nickel-phosphide-derived films as catalysts for electrochemical overall water splitting

Cited by 80 publications

References 53 publications

Amorphous/Crystalline Heterostructured Nickel Phosphide Nanospheres for Electrocatalytic Water and Methanol Oxidation Reactions

Amorphous/Crystalline Heterostructured Nickel Phosphide Nanospheres for Electrocatalytic Water and Methanol Oxidation Reactions

Electrodeposition: An efficient method to fabricate self‐supported electrodes for electrochemical energy conversion systems

Atomic Heterointerface Engineering of Ni₂P‐NiSe₂ Nanosheets Coupled ZnP‐Based Arrays for High‐Efficiency Solar‐Assisted Water Splitting

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Electrodeposited amorphous cobalt-nickel-phosphide-derived films as catalysts for electrochemical overall water splitting

Cited by 80 publications

References 53 publications

Amorphous/Crystalline Heterostructured Nickel Phosphide Nanospheres for Electrocatalytic Water and Methanol Oxidation Reactions

Amorphous/Crystalline Heterostructured Nickel Phosphide Nanospheres for Electrocatalytic Water and Methanol Oxidation Reactions

Electrodeposition: An efficient method to fabricate self‐supported electrodes for electrochemical energy conversion systems

Atomic Heterointerface Engineering of Ni2P‐NiSe2 Nanosheets Coupled ZnP‐Based Arrays for High‐Efficiency Solar‐Assisted Water Splitting

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Product

Resources

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Atomic Heterointerface Engineering of Ni₂P‐NiSe₂ Nanosheets Coupled ZnP‐Based Arrays for High‐Efficiency Solar‐Assisted Water Splitting