Substitutional Doping Engineering toward W₂N Nanorod for Hydrogen Evolution Reaction at High Current Density

Abstract

Transition metal nitrides and elemental doping are effective methods to enhance the catalytic activity of hydrogen evolution reaction (HER) at a high current density. Herein, Ni-W2N@NF was synthesized to exhibit excellent HER performance in an alkaline environment. Not only theoretical but also experimental analyses prove that Ni enters the W2N lattice in the form of substitutional doping. Ni-doped W2N optimizes the free energy of hydrogen adsorption and hydroxide adsorption. Thus, the HER kinetics are accelerated. Therefore, the synthesized Ni-W2N@NF achieved an industrial high current density of 2000 mA cm–2 in 1 M KOH with a small overpotential of 317 mV. The HER activity of Ni-W2N@NF is superior to those of most reports. What is more, the obtained catalyst achieves a current density of 1500 mA cm–2 in an alkaline seawater solution with an overpotential of only 345 mV and exhibits excellent cycling stability. This work will offer a feasible idea for a designing platinum group metals free metal as an effective catalyst for HER reaction under an industrial large current in an alkaline solution.

Directly Sputtered Molybdenum Disulfide Nanoworms Decorated with Binder-less VN and W2N Nanoarrays for Bendable Large-Scale Asymmetric Supercapacitor

“…On the other hand, two relatively weak peaks (at 37.68 and 35.11 eV) are associated with W–O bonding (oxidation number W 6+ ), as shown in Figure c. This set of spectral lines designates the formation of the W 2 N phase in the composite thin film. , The N 1s high-resolution spectra constitute three XPS peaks detected at 401.48, 399.08, and 396.10 eV, advising their corresponding N–O, N–C/N–O–W, and N–W bonding configurations (Figure c). , The incorporation of VN or W 2 N into molybdenum disulfide nanolayers enables the multiple valence states and electron-donating behavior of nitrogen species. It also facilitates better wettability at the electrode/electrolyte borderline and further improves the redox activity.…”

“…37,38 The N 1s high-resolution spectra constitute three XPS peaks detected at 401.48, 399.08, and 396.10 eV, advising their corresponding N−O, N−C/N− O−W, and N−W bonding configurations (Figure 3c). 37,43 The incorporation of VN or W 2 N into molybdenum disulfide nanolayers enables the multiple valence states and electrondonating behavior of nitrogen species. It also facilitates better wettability at the electrode/electrolyte borderline and further improves the redox activity.…”

Electrocatalytic sulfion recycling assisted energy-saving hydrogen production using CuCo-based nanosheet arrays

“…35 In addition, compared to suldes or oxides of transition metals, transition metal nitrides oen exhibit high electrical conductivity and low electrical resistance, showing superior electrocatalytic activity for the HER. [36][37][38][39][40] For example, Co 2 N can provide the active sites to adsorb *OH 41,42 and Cu 4 N can be used as the active site to desorb H* to improve the release of H 2 . 43 Therefore, CuCo-based materials are potential catalysts for the HER and SOR.…”

Development of a Multi‐Element Copper‐Phosphorus‐Based Electrode for Efficient Hydrogen Evolution Reaction

“…Therefore, there is an urgent need to develop new catalytic materials for hydrogen production at lower cost and higher efficiency. [4][5][6] Phosphides composed of transition metals like Cu and Ni have attracted increasing attention because of their abundant natural resources and catalytic properties that are similar to those of noble metals. [7][8] Therefore, transition metal phosphides (TMPs) have gradually become alternatives to preciousmetal catalysts.…”

“…The scarcity and cost of precious‐metal electrocatalysts limit the industrialization of hydrogen production by water electrolysis. Therefore, there is an urgent need to develop new catalytic materials for hydrogen production at lower cost and higher efficiency [4–6] …”