Transition Metal/Metal Oxide Interface (Ni–Mo–O/Ni₄Mo) Stabilized on N-Doped Carbon Paper for Enhanced Hydrogen Evolution Reaction in Alkaline Conditions

Abstract

Designing hydrogen evolution reaction catalysts with high performance in alkaline conditions is important for reducing energy consumption during water electrolysis. This study reports an electrodeposition−calcination−electrodeposition strategy to construct the Ni−Mo−O/Ni 4 Mo nanointerface on an Ndoped carbon support derived from polyaniline on carbon fiber paper. The N-doped carbon support not only stabilizes the metal/ metal oxide nanointerface but also generates more active intrinsic sites and electrical conductivity via the metal−N interaction. The obtained Ni−Mo−O/Ni 4 Mo@NC displays a low overpotential of only 61 mV at a current density of 10 mA cm −2 for alkaline HER in 1 M KOH.

Effectively Tuning the Ratio of CO and H2 into Syngas through CO2 Electrochemical Reduction over a Wide Potential Range on a ZnO Nanosheet via Ni Doping

“…Furthermore, the maximum current density was 3.4 mA cm –2 (ZnO-Ni1), 3.7 mA cm –2 (ZnO-Ni2), and 5.4 mA cm –2 (ZnO-Ni3), which was 1.69, 1.86, and 2.69 times larger than that of pure ZnO, respectively, indicating that the intrinsic activity of HER could be enhanced with the doping of Ni in ZnO. The enhanced intrinsic HER properties might be attributed to the doping of Ni in metal oxide, which could induce the electron deficiency in vicinal O sites thus benefitting the adsorption of H and the lower resistance of Ni-doped ZnO could accelerate the electron transfer. ,, Thus, the larger surface and enhanced HER activity after the doping of Ni both benefitted the production of H 2 . Taking the ECR and HER into consideration, as the Ni content increased in the ZnO matrix, the slower kinetics of ECR and the enhanced HER were achieved.…”

“…The enhanced intrinsic HER properties might be attributed to the doping of Ni in metal oxide, which could induce the electron deficiency in vicinal O sites thus benefitting the adsorption of H and the lower resistance of Ni-doped ZnO could accelerate the electron transfer. 44,65,66 Thus, the larger surface and enhanced HER activity after the doping of Ni both benefitted the production of H 2 . Taking the ECR and HER into consideration, as the Ni content increased in the ZnO matrix, the slower kinetics of ECR and the enhanced HER were achieved.…”

Insights into alloy/oxide or hydroxide interfaces in Ni–Mo-based electrocatalysts for hydrogen evolution under alkaline conditions

“…[20][21][22] Among them, nickel-based materials are the most used electrocatalysts in alkaline electrolyzers, and especially, nickel-molybdenum (Ni-Mo) bimetallic catalysts exhibit the best HER catalytic performance among all the non-noble metal-based materials. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] Typically, Ni 4 Mo alloy nanoparticles supported by MoO 2 cuboids on nickel foam exhibited zero onset overpotential, an overpotential of 15 mV at 10 mA cm −2 and a low Tafel slope of 30 mV dec −1 in 1 M KOH. 23 Such performance is comparable to that of Pt and superior to those of state-of-the-art Pt-free electrocatalysts.…”

Tunable d-band center of a NiFeMo alloy with enlarged lattice strain enhancing the intrinsic catalytic activity for overall water-splitting

“…Energy is one of the most concerning topics currently, 1 and the increasing consumption of non-renewable resources and the consequent environmental pollution have forced people to seek an environmentally friendly clean energy source. Hydrogen is considered an ideal alternative fuel for the future.…”