Facile Synthesis of Well-Dispersed Ni2P on N-Doped Nanomesh Carbon Matrix as a High-Efficiency Electrocatalyst for Alkaline Hydrogen Evolution Reaction

Abstract

The development of non-noble metal hydrogen evolution catalysts that can replace Pt is crucial for efficient hydrogen production. Herein, we develop a type of well-dispersed Ni2P on N-doped nanomesh carbon (NC) electrocatalyst by a facile pyrolysis method, which shows excellent hydrogen evolution reaction (HER) catalytic performance. It is rather remarkable that the overpotential of Ni2P/NC prepared under optimal proportion is 108 mV at 10 mA·cm−2 current density in 1 M KOH solution with the tafel slope of 67.3 mV·dec−1, the catalytic activity has no significant attenuation after 1000 cycles of cyclic voltammetry (CV)method. The hydrogen evolution performance of the electrocatalytic is better than most similar catalysts in alkaline media. The unique mesh structure of the carbon component in the catalyst facilitates the exposure of the active site and reduces the impedance, which improves the efficiency of electron transport as well as ensuring the stability of the hydrogen evolution reaction. In addition, we prove that nitrogen doping and pore structure are also important factors affecting catalytic activity by control experiments. Our results show that N-doped nanomesh carbon, as an efficient support, combined with Ni2P nanoparticles is of great significance for the development of efficient hydrogen evolution electrodes.

MoS2 Decoration Followed by P Inclusion over Ni-Co Bimetallic Metal–Organic Framework-Derived Heterostructures for Water Splitting

“…All the narrow scans of individual atoms are deconvoluted with the Gaussian fitting program, as shown in Figure . The deconvoluted Ni atom (Figure a) displays two major peaks at 855.8 and 873.79 eV corresponding to the Ni 2p 3/2 and Ni 2p 1/2 , with a spin-orbit splitting of 17.9 eV closely related to the formation of Ni 2 P. Two satellite/shoulder peaks are observed at 862.2 and 880.6 eV for 2p 3/2 and 2p 1/2 orbitals Figure b represents the deconvoluted Co atom, which shows the characteristic 2p 3/2 and 2p 1/2 spin orbits at 781.13 and 796.87 eV, respectively, with the satellite peak at 786.10 and 803.62 eV .…”

“…The deconvoluted Ni atom (Figure 4a) displays two major peaks at 855.8 and 873.79 eV corresponding to the Ni 2p 3/2 and Ni 2p 1/2 , with a spin-orbit splitting of 17.9 eV closely related to the formation of Ni 2 P. Two satellite/shoulder peaks are observed at 862.2 and 880.6 eV for 2p 3/2 and 2p 1/2 orbitals. 64 Figure 4b represents the deconvoluted Co atom, which shows the characteristic 2p 3/2 and 2p 1/2 spin orbits at 781.13 and 796.87 eV, respectively, with the satellite peak at 786.10 and 803.62 eV. 65 For the Mo atom (Figure 4c), two characteristics peaks are observed at 232.03 and 235.12 eV corresponding to 3d 5/2 and Mo 6+ 3d 3/2 orbitals of Mo 6+ , respectively.…”

Nickel and Nitrogen-Doped Bifunctional ORR and HER Electrocatalysts Derived from CO2

“…The reasons for the HER activity of these materials are much the same as for the ORR activity; however, in this case, the material not leached in acid was somewhat more active, likely due to the overall higher surface area and higher nickel oxide content. The E @10 mA cm –2 values reached are very competitive values, in comparison with other catalysts in the literature based on carbon-encapsulated metal nanoparticles, which are commonly derived from expensive and CO 2 -intesive precursors such as MOFs or CNTs made by CVD (further discussed below). ,,− ,− In this sense, the CO 2 -derived materials shown here do not even have a direct competitor, since all other catalysts presented previously have always had a large positive CO 2 footprint, which is, in some cases, reduced by using precursors such as biomass or waste, but never before has any HER or ORR catalyst captured CO 2 simply by its synthesis.…”

Bifunctional α‐MnO2 and Co3O4 Catalyst for Oxygen Electrocatalysis in Alkaline Solution

“…[92] Other authors, in turn, simply assume a linear relationship and calculate the double-layer capacitance from the line of best fit. [93][94][95] However, the authors ascribed deviation of specific capacitance from linearity with increasing potential scan-rate to be due to i) an easily accessible outer surface area, C outer , that can be readily charged particularly at high potential scan-rates and ii) an inner surface area, C inner , created by the pore network within the catalyst particle structure, which is less accessible due to mass transfer/diffusion limitation of ions resulting in less charge stored and lower double-layer capacitance values, respectively. [90,91,96] Therefore, capacitance at low potential scan-rates is representative of the total surface capacitance, i. e., the capacitance due to inner and outer surface area, whereas the capacitance at higher potential scan-rates corresponds to the charge of easily accessible outer surface area.…”