Integrating energy-saving hydrogen production with methanol electrooxidation over Mo modified Co₄N nanoarrays

Abstract

The intrinsically sluggish kinetics of anodic oxygen evolution reaction (OER) is deemed as the bottleneck for highly efficient electrocatalytic hydrogen production, and the by-product is the less value-added oxygen. Herein,...

PEM water electrolysis for hydrogen production: fundamentals, advances, and prospects

“…DFT calculations suggested the decent electrocatalytic activity attributed to the V and Se vacancies, which are beneficial for the phase transition from the 2H phase to the 1T phase and forming the intermediates in HER. Additionally, various cation-doping is also an effective strategy to tune the surface electronic structure of catalysts and optimize the hydrogen adsorption free energy, improving the electrocatalytic HER activity [46,47]. Morozan et al [24] adopted microwave irradiation or heat treatment in a furnace under inert and reductive atmospheres to prepare the bimetallic FeMoS catalyst, which presented a low overpotential of 140 mV at the current density of 10 mA cm −2 .…”

Popcorn-like Co3O4 nanoparticles confined in a three-dimensional hierarchical N-doped carbon nanotube network as a highly-efficient trifunctional electrocatalyst for zinc–air batteries and water splitting devices

“…[1][2][3] Three basic electrochemical reactions are involved in the above energy technologies (the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER)) all requiring highlyefficient electrocatalysts for their implementation. 4,5 At present, Pt, Pd, Ru, Ir and their oxides are widely researched, 6,7 but there are still many problems for noble metal catalysts, such as poor stability, high cost and scarcity, severely hindering their widespread availability. 8,9 In practical applications, bifunctional HER and OER catalysts with low overpotentials are required in water splitting systems, while OER/ORR catalysts are desirable cathode catalysts for Zn-air batteries.…”

“…To make a further investigation towards multifunctional catalysts (ORR/OER/HER), Co-based catalysts have attracted considerable attention as a result of their low cost, hypotoxicity, multivalent nature and structural diversity. 5,8,18 Cheng et al applied carbon cloth supported cobalt phosphide (CoP@CC) as a multifunctional electrocatalyst toward ORR, OER, and HER with long-term durability, indicating its great potential in Zn-air batteries. 7 Additionally, Co 3 O 4 species accompanied by conductive agents (carbon nanotubes/ graphene) showed high conductivity and outstanding performance for zinc-air batteries.…”

The identified intrinsic active sites for efficient and stable bi-functional catalyst N-MoS2·Ni3S2/NiS: the Mo–N structure and Ni–S structure on the heterogeneous interface synergistically enhance water splitting

“…4,5 In general, the overall water splitting reaction depends on two halfreactions: the hydrogen evolution reaction at the cathode and the oxygen evolution reaction at the anode. 6 At present, most of the bi-functional catalysts with excellent water splitting performance and stability reported in the literature are compounds, but the existence of multiple crystal phases makes it difficult to analyze the intrinsic active catalytic sites, which makes it a challenge to synthesize outstanding-performance and long-term stability catalysts by accurately regulating the structure. [7][8][9][10][11] MoS 2 has been proven to be one of the most promising electrocatalyst for the HER, due to the rich edge Mo sites of 2D MoS 2 being efficient catalytic sites for hydrogen evolution.…”