Surface Engineering of 3D Gas Diffusion Electrodes for High‐Performance H₂ Production with Nonprecious Metal Catalysts

Abstract

Highly active transition metal phosphide hydrogen evolution catalysts with low overpotentials, unprecedented mass activities, high turnover frequencies, and promising durability are prepared by modifying the wetting properties of the underlying electrode. The origin of the improved performance is linked to an improved catalyst dispersion and morphology enabling high surface area CoP formulations at low-loadings.

Recent progress in understanding the catalyst layer in anion exchange membrane electrolyzers – durability, utilization, and integration

“…For example, Sanchez et al utilized an electrodeposition technique on oxidized C-based transport layers to achieve low loadings of Co-based HER catalysts, decreasing mass transport resistances and increasing overall cell performance. 119 Relatedly, several other recent studies have employed this technique to create threedimensional structures and enhance both OER and HER performance by increasing active surface areas and tuning morphological properties. 41,[116][117][118]120 Other strategies include thermochemical deposition, where the catalyst materials are grown directly onto the transport layer or membrane without the use of applied potential.…”

Recent developments of membranes and electrocatalysts for the hydrogen production by anion exchange membrane water electrolysers: A review

“…It has been reported that a wide range of non-preciousmetals based OER electrocatalysts have excellent activities, including transition metal sulfides (Fu et al, 2018, Jiang et al, 2018, Xu et al, 2018, Hong et al, 2019, /phosphides (Xiao et al, 2017, Yu et al, 2018, Sanchez et al, 2019) /oxides (Choi et al, 2018, Xu et al, 2018, and layers and double hydroxides (Yang et al, 2018, Zhou et al, 2018, Kuai et al, 2019. It is expected that the very low overpotential ( 300 mV at 10 mA/cm 2 ) and durability of these catalysts will facilitate the commercialization of water electrolyzers.…”

Superhydrophobicity-Enabled Efficient Electrocatalytic CO2 Reduction at a High Temperature

“…The electrode was fabricated by immobilizing gold (Au) nanoparticles, a model electrocatalyst, on a superhydrophobic porous carbon substrate, as shown in Figure . The electrocatalytic system has a solid–liquid–gas three-phase interface architecture similar to the gas diffusion electrode, − which facilitates the rapid CO 2 supply through the gas phase and allows the interface microenvironment to maintain a high CO 2 concentration, even at relatively high temperatures. In this three-phase catalytic system, the partial current density and turnover frequency of the reduction product CO were increased by 240% as the reaction temperature increased from 8 to 60 °C.…”