0.03 V Electrolysis Voltage Driven Hydrazine Assisted Hydrogen Generation on NiCo phosphide Nanowires Supported NiCoHydroxide Nanosheets

Abstract

In order to decrease the electricity consumption of hydrogen generation, hydrazine‐assisted water electrolysis is intensively investigated recently. Herein, hierarchical nanostructure of ultrathin NiCo(OH)x nanosheets (NSs) that in‐situ grown on the NiCoP nanowires (NWs) was deposited on nickel foam (NF) to construct NiCo(OH)x@NiCoP/NF electrode. NiCoP NWs extend the surface area, spatial utilization of NF and enhance the electron conduction to the outmost NiCo(OH)x NSs. NiCo(OH)x NSs interlace to form regular mesoporous channels, which improve the structural stability and mass transfer rate. Moreover, NiCoP NWs enhance the adsorption of protons and the transfer of electrons, while NiCo(OH)x NSs facilitate the adsorption of OHad during reaction. As a result, NiCo(OH)x@NiCoP/NF exhibits excellent activity for both hydrazine oxidation reaction (HzOR) and hydrogen evolution reaction (HER). Based on the NiCo(OH)x@NiCoP/NF||NiCo(OH)x@NiCoP/NF couples, electrolysis of hydrazine for hydrogen generation only requires an extremely low cell voltage of 0.03 V.

Superhydrophilic Ni‐based Multicomponent Nanorod‐Confined‐Nanoflake Array Electrode Achieves Waste‐Battery‐Driven Hydrogen Evolution and Hydrazine Oxidation

“…[ 19 ] Then, the available Ni/NiCo may facilitate the adsorption of hydrazine molecule and the dissociation of H ad from N 2 H 4 , which further combines with the reactive OH ad to form H 2 O, thus could be of prime importance to improve the electrocatalytic HzOR performance. [ 42 ] The above evidence piece an outline that the several constituents in Ni NCNA are an organic entity to boosting the HzOR activity.…”

Vanadium Substitution Steering Reaction Kinetics Acceleration for Ni3N Nanosheets Endows Exceptionally Energy-Saving Hydrogen Evolution Coupled with Hydrazine Oxidation

“…In recent years, there has been accelerated depletion of fossil fuels with accompanying climate dilemma, and the strict demand for sustainable environmentally conscious societies started in the late 20th century calls for the upgrade of global energy systems, , requiring clean energy storage and conversion systems. − The next-generation energy resources require high energy density and adequate abundancy with less carbon, among which hydrogen (H 2 ) is expected to be an ideal alternative option to the conventional fossil fuels. − Electrochemical water splitting seems to be an ecofriendly pathway to supply H 2 ; thus, substantial research studies have committed to explore efficient electrocatalysts for its economic production. However, the current two-electrode water electrolyzer still needs much higher cell voltages (1.6–2.0 V) to reach the large current compared with the theoretical value (1.23 V). − In this context, it is now increasingly recognized that utilizing hydrazine oxidation reaction (HzOR, −0.33 V vs RHE) at the anode side coupled with hydrogen evolution reaction (HER, 0 V vs RHE) at the cathode to construct an overall hydrazine splitting (OHzS) system can realize the production of H 2 more efficiently and economically. − Generally, energy conversion devices, such as fuel cells, metal–air batteries, water electrolysis cells, and such electrolyzers for energy-saving H 2 production, generate manifold electrochemical reactions, in which efficient catalysts occupy the central position. Traditional monofunctional electrocatalysts suitable either for anode or cathode reaction could require different chemicals, equipment, and tedious procedures, thus imposing a major consideration relative to the cost and the environmental footprint.…”

Hydrazine Oxidation Electrocatalysis

“…The nitrides, , sulfides, , phosphides, ,,,,− and selenides ,, of Ni and Co are popular HzOR electrocatalysts. E onset values as low as −0.18 to 0 V vs RHE at pH = 14 were reported for such inorganic phases, ,,,− including on carbon ,,,,− or metallic foam supports. ,,,− ,,,− Nanoparticles of FeP, Cu 3 P, Cu 2 Se, and RuP 2 are active toward the HzOR, with reported onsets as low as −0.1 V vs RHE for the Ru-based material. However, most transition metals (including Ni, Co, Cu, and Fe) are most stable as hydroxides at pH 14 at 25 °C. , Thus, the inorganic compounds serve only as precursors, so that the catalytic hydroxide surface forms in situ .…”