A sulfur-doped Ni₂P electrocatalyst for the hydrogen evolution reaction

Abstract

Hydrogen energy is considered as one of the most ideal clean energies to replace fossil fuels because of its high energy density, recyclability and environmental friendliness. The design and development...

Electrocatalytic Reforming of Polylactic Acid Plastic Hydrolysate over Dynamically Formed γ-NiOOH

“…The survey XPS spectrum clearly displayed Ni and P, with the Ni 2p spectrum showing contributions at 874 and 857 eV for Ni­(II) and satellite peaks at 880 and 862 eV (Figure d). Notably, the peaks at 853 and 870 eV were attributed to nickel phosphorus species, consistent with previous reports. − The P 2p spectrum indicated the existence of two chemical environments for phosphorus species: the dominant peak at 129 eV was characteristic of Ni 2 P, and the second peak at 134 eV represented phosphorus in an oxidizing environment (Figure S4). Apparently, the formation of phosphorus–oxygen bonds was mainly due to the oxidation of the Ni 2 P surface after exposure to air, , in agreement with the results of EDS (Figure S5).…”

MOF-Templated Synthesis of Three-Dimensional B-Doped NiCoP Hollow Nanorod Arrays for Highly Efficient and Stable Natural Seawater Splitting

“…Recently, many studies have been dedicated to enhancing the activities of electrocatalysts by maximizing the number of active sites, increasing the charge transport, and optimizing the adsorption ability of intermediates. − Pioneering works suggested that incorporating heteroatoms (e.g., B, N, F, or S) into TMPs is a facile and efficient method for improving HER activity in freshwater and seawater electrolysis. ,− Boron has been studied as an electron-deficient dopant, which can effectively modulate the electron density and rearrange the electronic structure of TMPs, generating low-valence metal centers due to its lower electronegativity than P. , Such low-valence metal centers can promote the water dissociation step and optimize Δ G H* to accelerate the kinetics of HER. In the previous work by Tian et al, they reported that the B-doping CoP nanowires array exhibited excellent electrocatalytic performance for HER in alkaline media .…”

“…The recent theoretical and experimental results demonstrated that transition-metal-based electrocatalysts, including oxides, hydroxides, chalcogenides, carbides, phosphides, fluorides, and nitrides, have excellent electrochemical activity for HER. Among them, transition-metal phosphides (TMPs), such as Ni 2 P, CoP, FeP, and MoP, have attracted ever-growing attention for electrochemical water splitting and are identified as the potential candidates to replace noble-metal electrocatalysts due to their unique electronic structures, high electrical conductivity, low cost, and outstanding stability. − Although several approaches have been applied to enhance the HER activity of TMPs in freshwater and seawater electrolysis, their catalytic activities still do not meet industrial applications’ requirements. Thus, it remains desirable to develop efficient seawater electrolysis using TMP-based electrocatalysts.…”

Highly Efficient and Stable Hydrogen Evolution from Natural Seawater by Boron-Doped Three-Dimensional Ni2P–MoO2 Heterostructure Microrod Arrays

“…Among various tactics, heteroatom doping is a common technique used to enhance the intrinsic activity of electrocatalysts. Several lightweight elements, such as P, F, S, and B, have been used as dopants to enhance the HER activity of transition metal oxides, sulfides, and phosphides. − For instance, B has been introduced into CoP nanowire arrays to induce electron redistribution and alter the d-band structure of Co to form a low-valence Co center, which accelerated the HER activity . It should be noted that the low-valence metal center can prompt electrocatalytic activity by accelerating the water dissociation step.…”