Hierarchical Ohmic Contact Interface Engineering for Efficient Hydrazine‐Assisted Hydrogen Evolution Reaction

Abstract

Hydrazine oxidation reaction coupled with hydrogen evolution reaction (HER) is an effective strategy to achieve low energy water splitting for hydrogen production. In order to realize the application of hydrazine‐assisted HER system, researchers have been focusing on the development of electrocatalysts with integrated dual active sites, while the performance under high current density is still unsatisfying. In this work, hierarchical Ohmic contact interface engineering is designed and used as a bridge between the NiMo and Ni2P heterojunction towards industrial current density applications, with the charge transfer impedance greatly eliminated via such a pathway with low energy barrier. As a proof‐of‐concept, the importance of charge redistribution and energy barrier at the Ohmic contact interface is investigated by significantly reducing the voltage of overall hydrazine splitting (OHzS) at high current density. Intriguingly, the NiMo/Ni2P hierarchical Ohmic contact heterojunction can drive current densities of 100 and 500 mA cm−2 with only 181 mV and 343 mV cell voltage in the OHzS electrolyzer with high electrocatalytic stability. The proposed hierarchical Ohmic contact interface engineering paves new avenue for hydrogen production with low energy consumption.This article is protected by copyright. All rights reserved

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.…”

Dual-strategy engineered nickel phosphide for achieving efficient hydrazine-assisted hydrogen production in seawater

“…Exploiting active and steady catalysts is the second crucial solution to improve catalytic properties and overcome chlorine electrochemistry during seawater electrolysis. 17–19 Currently, noble-metal materials exhibit remarkable intrinsic activities due to their special electronic structure and proper adsorption energy with reactants and intermediates. 20,21 Nevertheless, their scarcity, high price and general stability impede their large-scale industrialization.…”

Numerical simulation of a novel high performance solid‐state dye‐sensitised solar cell based on N719 dye

“…Pt exhibits remarkable chemical stability, ensuring long-term operational efficiency and durability of solar cell devices [25]. Additionally, Pt forms an ohmic contact with many semiconductor materials, minimising resistance to current flow and maximising power output [26]. The synergistic combination of these materials imbues ssDSSCs with the necessary properties for efficient solar energy conversion, underscoring their pivotal role in advancing renewable energy technologies.…”