Unveiling the advantages of an ultrathin N-doped carbon shell on self-supported tungsten phosphide nanowire arrays for the hydrogen evolution reaction experimentally and theoretically

Abstract

Packaging the electrocatalysts with carbon shells offers an opportunity to develop stable and effective hydrogen evolution reaction (HER) materials. Here, an ultrathin N-doped carbon-coated self-supported WP nanowire arrays (WP@NC NA)...

Heterogeneous Ni3P/Ni nanoparticles with optimized Ni active sites anchored in N-doped mesoporous nanofibers for boosting pH-universal hydrogen evolution

“…The above results implied that the hydrogen evolution reaction pathway of the Ni 3 P/Ni@N-CNFs catalyst followed the Volmer–Heyrovsky mechanism, and the Volmer step was the rate-determining step. 12,64…”

“…The above results implied that the hydrogen evolution reaction pathway of the Ni 3 P/Ni@N-CNFs catalyst followed the Volmer-Heyrovsky mechanism, and the Volmer step was the rate-determining step. 12,64 The electrochemically active surface area (ECSA) is also a critical parameter used to estimate the electrocatalytic activity, and its magnitude is proportional to the value of the double layer capacitance of the catalyst. The C dl values calculated by measuring the CV curves of the samples with different sweep rates in the non-faradaic region (Fig.…”

“…[9][10][11] However, sluggish hydrogen evolution reaction (HER) kinetics and heavy electricity consumption actuate people to search for highly efficient catalysts. 12,13 Noble metal Pt-based catalysts are well acknowledged to be the most active catalysts for hydrogen evolution, but their high price and rare reserves limit their largescale industrial application. 14 Therefore, the exploitation of non-noble metal electrocatalysts with abundant storage and high activity is of great significance to achieve the promotion of electrocatalytic hydrogen production technology.…”

In situ encapsulation of abundant WP/Ni2P heterointerfaces in N,P co-doped two-dimensional carbon frameworks for boosting hydrogen evolution electrocatalysis

“…3b illustrates the high-resolution C 1s spectrum of WP-Ni 2 P@NPC, in which the peaks located at 284.80, 285.75 and 286.78 eV are assigned to C-C/CvC, C-N/C-P and C-O, respectively, also demonstrating the successful integration of N dopants. 18 Fig. 3c displays the high-resolution N 1s spectra of WP-Ni 2 P@NPC, where the four peaks located at 398.70, 399.90, 401.30 and 403.00 eV are well attributed to the four different N-dopants: pyridinic N, pyrrolic N, graphitic N and oxidized N, respectively.…”

“…17 Also, the incorporation of heteroatom-doped carbons provides additional active sites, which can decrease the hydrogen adsorption free energy (Δ G H *) of WP, further improving the HER electrocatalytic performance of WP. 18 Typically, Raj et al demonstrated an excellent HER electrocatalyst, in which the WP nanoparticles are encapsulated into nitrogen-doped carbon shells, via self-assembling of phosphotungstic acid and phytic acid followed by subsequent pyrolysis. 19 Encouraged by the previous beneficial research, we are looking forward to combining heterostructure construction and nanocarbon coupling strategies to explore a highly active WP-based HER electrocatalyst.…”