Quasi-parallel nickel cobalt phosphide nanosheet arrays as highly efficient electrocatalyst for hydrogen evolution and overall water splitting at large current densities

Li, Lingfeng; Zou, Wenru; Ye, Qinglan; Li, Qi; Feng, Qingge; Jiang, Wei; Xu, Xuetang; Wang, Fan

doi:10.1016/j.jpowsour.2021.230657

Cited by 19 publications

(9 citation statements)

References 54 publications

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“…For the primary NiCo LDH/NF electrode, many smooth nanosheets grow in a quasi-parallel mode with a spacing of 200–500 nm and are arranged in different domain regions on the surface of NF substrate, while the thickness of the nanosheets is approximately 30 nm (Figure b). The formation of nanosheet arrays with the help of NH 4 F is prevalent on the surface of NF, which had been suggested in many previous works. − Meanwhile, the quasi-parallel alignment of nanosheets was formed via a substrate-inductive effect worked by the etched surface and the initial α-Ni(OH) 2 layer, which also had been discussed in our previous work . Side views of the primary NiCo LDH nanoarrays in Figure S1 illustrate that the nanosheets are vertically grown with a height of about 3 μm.…”

Section: Resultssupporting

confidence: 54%

“…Of note, the surface of the Ni metal should be covered by a hydroxide layer initially during the hydrothermal process. Therefore, the sequential deposition of NiCo LDH is carried out on the surface of the NiCo LDH nanosheet or Ni-based hydroxide layer on ENF, and actually, a lattice-match epitaxial growth is responsible for the evolution in the interlayer spacing of NiCo LDH, since the shifts of the (003) peaks in NiCo LDH/ENF electrodes bear great similarity with those on ENF substrates. Figure shows the SEM images of NiCo LDH nanoarrays grown on different ENF substrates.…”

Section: Resultsmentioning

confidence: 99%

“…12 Recently, we found that the interaction between the as-loaded Ni/Co-based LDH and NF substrate can be enhanced via a substrate effect from the initial α-Ni(OH) 2 layer, which is grown on the etched NF surface prior to the growth of the NiCo LDH nanoarray. 13,14 Resultantly, the charge transfer capability and durability of the nanoarray electrodes are improved effectively. Thus, the initial α-Ni(OH) 2 layer on the etched surface would provide an alternative for regulating the growth behavior and electrochemical performance of active materials.…”

Section: Introductionmentioning

confidence: 99%

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NiCo Layered Double Hydroxide Nanoarrays Grown on an Etched Ni Foam Substrate for High-Performance Supercapacitor Electrode

Zhu

Zeng

et al. 2023

Energy Fuels

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Nickel foam (NF) with a desirable 3D open-pore structure is extensively adopted in developing integrated electrodes, and the enhanced interaction between the electrode materials and NF substrate is recognized as an effective method for a highperformance supercapacitor electrode with a low resistance nature and high stability. In this work, an etched NF (ENF) with residual nanosheets is adopted as a novel substrate to facilitate the capacitive activity of NiCo layered double hydroxide (NiCo LDH) nanowire arrays. NiCo LDH nanosheet arrays grown on a pristine NF substrate (NiCo LDH/NF) are synthesized initially and used as a precursor. Then, the ENF substrate with a residual nanosheet is obtained by partially removing NiCo LDH nanosheet arrays in a formamide/KOH mixed solution. Subsequently, NiCo LDH nanowire arrays are hydrothermally grown on ENF to form a NiCo LDH/ENF electrode. The role of the residual nanosheet on ENF is discussed in detail, in which the content of Ni 3+ /Co 3+ and the resistance nature of NiCo LDH/ENF can be optimized with the amount of residual nanosheets. Hence, the ENF substrate with an optimal amount of residual nanosheets is beneficial for retaining the adhesion of nanoarrays and realizing the low resistance nature in a mild route. The NiCo LDH/ENF electrode shows a capacity of 976.6 C g −1 at 1 A g −1 with excellent cyclic stability. The asassembled NiCo LDH/ENF//activated carbon hybrid supercapacitor delivers a high specific capacitance of 150.8 F g −1 at 1 A g −1 and achieves an energy density of 67.9 Wh kg −1 at a power density of 900 W kg −1 with an excellent cycle stability with a 90.6% capacity retention after 10,000 cycles, indicating high energy density and good stability.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NiCo Layered Double Hydroxide Nanoarrays Grown on an Etched Ni Foam Substrate for High-Performance Supercapacitor Electrode

Zhu

Zeng

et al. 2023

Energy Fuels

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“…Such abundant quasi-parallel channels can expedite the mass transportation of reactants and products during the catalysis process. [12,49] The cross-sectional transmission electron microscopy (TEM) images of R-NF-Pt disclose a thin Pt/NiO x -O V layer with a thickness of ≈40−50 nm attached uniformly on the NF substrate (Figure 2a interface, which is beneficial for enhanced catalytic activity. Furthermore, the HRTEM image (Figure 2h) shows two distinct lattice fringes of 0.210 and 0.227 nm, matching well with the (200) crystal planes of NiO and (111) planes of metallic Pt, respectively.…”

Section: Resultsmentioning

confidence: 99%

Dense Platinum/Nickel Oxide Heterointerfaces with Abundant Oxygen Vacancies Enable Ampere‐Level Current Density Ultrastable Hydrogen Evolution in Alkaline

Wang¹,

Wang²,

Hui

et al. 2022

Adv Funct Materials

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Platinum (Pt) remains the benchmark electrocatalyst for alkaline hydrogen evolution reaction (HER), but its industry-scale hydrogen production is severely hampered by the lack of well-designed durable Pt-based materials that can operate at ampere-level current densities. Herein, based on the original oxide layer and parallel convex structure on the surface of nickel foam (NF), a 3D quasi-parallel architecture consisting of dense Pt nanoparticles (NPs) immobilized oxygen vacancy-rich NiO x heterojunctions (Pt/NiO x -O V ) as an alkaline HER catalyst is developed. A combined experimental and theoretical studies manifest that anchoring Pt NPs on NiO x -O V leads to electronrich Pt species with altered density of states (DOS) distribution, which can efficiently optimize the d-band center and the adsorption of reaction intermediates as well as enhance the water dissociation ability. The as-prepared catalyst exhibits extraordinary HER performance with a low overpotential of 19.4 mV at 10 mA cm −2 , a mass activity 16.3-fold higher than that of 20% Pt/C, and a long durability of more than 100 h at 1000 mA cm −2 . Furthermore, the assembled alkaline electrolyzer combined with NiFe-layered double hydroxide requires extremely low voltage of 1.776 V to attain 1000 mA cm −2 , and can operate stably for more than 400 h, which is rarely achieved.

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“…Various oxides (MoO x ) [ 9 ], hydroxides (Ni(OH) 2 ) [ 10 , 11 ], sulfides (MoS 2 ) [ 12 ], selenides (MoSe 2 ) [ 13 ], nitrides (VN) [ 14 ], and carbides (MXene) [ 15 , 16 ] materials have been extensively reported as water splitting electrocatalysts. Among the aforementioned catalysts, transition metal phosphides (TMPs) possess a hydrogenase-like structure, and are regarded as promising nonprecious electrocatalysts for overall water splitting [ 17 , 18 , 19 , 20 , 21 , 22 ]. Single metal phosphides have been widely reported in the field of water electrolysis [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

One-Step Electrochemical Synthesis and Surface Reconstruction of NiCoP as an Electrocatalyst for Bifunctional Water Splitting

et al. 2023

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We adopted a simple one-step electrochemical deposition to acquire an efficient nickel cobalt phosphorus (NiCoP) catalyst, which avoided the high temperature phosphatization engineering involved in the traditional synthesis method. The effects of electrolyte composition and deposition time on electrocatalytic performance were studied systematically. The as-prepared NiCoP achieved the lowest overpotential (η10 = 111 mV in the acidic condition and η10 = 120 mV in the alkaline condition) for the hydrogen evolution reaction (HER). Under 1 M KOH conditions, optimal oxygen evolution reaction (OER) activity (η10 = 276 mV) was also observed. Furthermore, the bifunctional NiCoP catalyst enabled a high-efficiency overall water-splitting by applying an external potential of 1.69 V. The surface valence and structural evolution of NiCoP samples with slowly decaying stability under alkaline conditions are revealed by XPS. The NiCoP is reconstructed into the Ni(Co)(OH)2 (for HER) and Ni(Co)OOH (for OER) on the surface with P element loss, acting as real “active sites”.

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Quasi-parallel nickel cobalt phosphide nanosheet arrays as highly efficient electrocatalyst for hydrogen evolution and overall water splitting at large current densities

Cited by 19 publications

References 54 publications

NiCo Layered Double Hydroxide Nanoarrays Grown on an Etched Ni Foam Substrate for High-Performance Supercapacitor Electrode

NiCo Layered Double Hydroxide Nanoarrays Grown on an Etched Ni Foam Substrate for High-Performance Supercapacitor Electrode

Dense Platinum/Nickel Oxide Heterointerfaces with Abundant Oxygen Vacancies Enable Ampere‐Level Current Density Ultrastable Hydrogen Evolution in Alkaline

One-Step Electrochemical Synthesis and Surface Reconstruction of NiCoP as an Electrocatalyst for Bifunctional Water Splitting

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