Anchoring nitrogen-doped Co2P nanoflakes on NiCo2O4 nanorod arrays over nickel foam as high-performance 3D electrode for alkaline hydrogen evolution

Ji, Xiaohao; Chen, Xiaoyu; Zhang, Lijuan; Meng, Cheng; He, Yilei; Zhang, Xing; Wang, Zumin; Yu, Rong

doi:10.1016/j.gee.2021.05.010

Cited by 20 publications

(10 citation statements)

References 33 publications

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“…As ΔG H* was linearly related to E d , the antibonding orbital lowered when electron orbitals are coupled by molecular orbitals, leading to a much weaker H-binding interaction, which is beneficial for the subsequent H* desorption. [29,30] According to the Newns-Anderson model and the d-band theory, the weaken adsorption strength is also widely observed in other charge transfer induced band center downshift. [30][31][32] Thus, optimized H* adsorption after V doping can be reasonably predicted.…”

Section: Resultsmentioning

confidence: 98%

“…[29,30] According to the Newns-Anderson model and the d-band theory, the weaken adsorption strength is also widely observed in other charge transfer induced band center downshift. [30][31][32] Thus, optimized H* adsorption after V doping can be reasonably predicted. All these results show that the introduction of V can effectively adjust the electronic structure of CoP hopefully to optimize the HER activity of the catalyst.…”

Section: Resultsmentioning

confidence: 98%

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Optimizing Electronic and Geometrical Structure of Vanadium Doped Cobalt Phosphides for Enhanced Electrocatalytic Hydrogen Evolution

et al. 2023

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Despite the expectation on transition-metal phosphides as precious-metal-free electrocatalysts, the reported performance of these materials still necessitates further improvement. Ingenious regulations of both geometric and electronic structure have been proposed as an effective approach to boost their electrocatalytic properties. In this regard, the selfsupported V doped CoP nanowires on nickel foam are prepared to accommodate both optimized electronic structure and desired nanostructure, which enable large surface area, abundant active sites exposure, low charge transfer resistance, as well as favorable H* adsorption. As for the alkaline hydrogen evolution, it only requires a lower potential of 79 mV and 125 mV to drive 10 mA • cm À 2 and 100 mA • cm À 2 current with a Tafel slope of 47.41 mV • dec À 1 , which prevails over commercial Pt/C catalysts. The catalyst also exhibits excellent durability to retain activity unchanged for more than 16 h. Such a simple and convenient strategy by electronic tuning and structure design provides a new avenue toward the exploration of efficient electrocatalysts.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

Optimizing Electronic and Geometrical Structure of Vanadium Doped Cobalt Phosphides for Enhanced Electrocatalytic Hydrogen Evolution

et al. 2023

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“…[18][19][20][21] Cobalt phosphide is a low-cost electrocatalyst that is widely used in electrocatalysis due to its corrosion resistance and tunable components. [21][22][23][24] Meanwhile, owing to its weak hydrogen bonding energy, it is a viable option for altering the strength of hydrogen adsorption on the Ru site. [25][26] Furthermore, it has recently been suggested that introducing phosphorus may alter the electronic structure of Ru.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Electronic Structure of Atomically Dispersed Ru Sites with CoP for Highly Efficient Hydrogen Evolution in both Alkaline and Acidic Media

Wang

Chi

Yang

et al. 2023

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Developing efficient and stable electrocatalysts for hydrogen evolution reaction (HER) over a wide pH range and industrial large‐scale hydrogen production is critical and challenging. Here, a tailoring strategy is developed to fabricate an outstanding HER catalyst in both acidic and alkaline electrolytes containing high‐density atomically dispersed Ru sites anchored in the CoP nanoparticles supported on carbon spheres (NC@RuSA‐CoP). The obtained NC@RuSA‐CoP catalyst exhibits excellent HER performance with overpotentials of only 15 and 13 mV at 10 mA cm−2 in 1 m KOH and 0.5 m H2SO4, respectively. The experimental results and theoretical calculations indicate that the strong interaction between the Ru site and the CoP can effectively optimize the electronic structure of Ru sites to reduce the hydrogen binding energy and the water dissociation energy barrier. The constructed alkaline anion exchange membrane water electrolyze (AAEMWE) demonstrates remarkable durability and an industrial‐level current density of 1560 mA cm−2 at 1.8 V. This strategy provides a new perspective on the design of Ru‐based electrocatalysts with suitable intermediate adsorption strengths and paves the way for the development of highly active electrocatalysts for industrial‐scale hydrogen production.

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“…In addition, direct growth of the catalyst on the substrate can avoid the use of binders, enable more intimate attachment, reduce contact resistance, and expose more active sites. 42,43 Through proper doping, the specific surface area was increased, interfacial charge-transfer resistance was decreased, and more importantly the electronic structure was adjusted. 44,45 As a result, CoP with a Mn doping amount of 10% (denoted as Mn 10 -doped CoP) delivered the best catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…In this 3D self-supported Mn-doped CoP/NF electrode, nickel foam (NF) works as a current collector with a robust skeleton, large surface area, and abundant porous channels, which can expedite mass diffusion and product desorption. In addition, direct growth of the catalyst on the substrate can avoid the use of binders, enable more intimate attachment, reduce contact resistance, and expose more active sites. , Through proper doping, the specific surface area was increased, interfacial charge-transfer resistance was decreased, and more importantly the electronic structure was adjusted. , As a result, CoP with a Mn doping amount of 10% (denoted as Mn 10 -doped CoP) delivered the best catalytic activity. In the alkaline half-cell, the Mn 10 -doped CoP/NF electrode achieved overpotentials as low as 60 and 112 mV at the current densities of 10 and 100 mA cm –2 , respectively, with a Tafel slope of 56.70 mV dec –1 .…”

Section: Introductionmentioning

confidence: 99%

Tuning the Mn Dopant To Boost the Hydrogen Evolution Performance of CoP Nanowire Arrays

et al. 2022

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Because of its advantages such as abundant resources, low cost, simple synthesis, and high electrochemical stability, cobalt phosphide (CoP) is considered as a promising candidate for electrocatalytic hydrogen evolution reaction. Through element doping, the morphology and electronic structure of the catalyst can be tuned, resulting in both the increase of the active site number and the improvement of the intrinsic activity of each site. Herein, we designed and fabricated Mn-doped CoP nanowires with a length of 3 μm, a diameter of 50 nm, and the pores between the grains of 10 nm. As a highly efficient electrocatalyst for alkaline hydrogen evolution, the Mn10-doped CoP/NF (doping amount is about 10 atom %) electrode presented overpotentials of 60 mV @ 10 mA cm–2 and 112 mV @ 100 mA cm–2, improved by 35 and 23%, respectively, compared with CoP/NF. Characterizations indicate that Mn doping increases the electrochemical active area, reduces the impedance, and tunes the electronic structure of the material. Density functional theory calculations also revealed that an appropriate amount of Mn dopant at a suitable location can both react as an active site itself and boost the activity of the surrounding Co sites, delivering favorable H* adsorption and rapid reaction kinetics. This result may not only promote the development of hydrogen evolution reaction catalysts but also encourage explorations of the relationship between the property and fine doping structure.

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Anchoring nitrogen-doped Co2P nanoflakes on NiCo2O4 nanorod arrays over nickel foam as high-performance 3D electrode for alkaline hydrogen evolution

Cited by 20 publications

References 33 publications

Optimizing Electronic and Geometrical Structure of Vanadium Doped Cobalt Phosphides for Enhanced Electrocatalytic Hydrogen Evolution

Optimizing Electronic and Geometrical Structure of Vanadium Doped Cobalt Phosphides for Enhanced Electrocatalytic Hydrogen Evolution

Optimizing the Electronic Structure of Atomically Dispersed Ru Sites with CoP for Highly Efficient Hydrogen Evolution in both Alkaline and Acidic Media

Tuning the Mn Dopant To Boost the Hydrogen Evolution Performance of CoP Nanowire Arrays

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