Improving the activity and stability of Ir catalysts for PEM electrolyzer anodes by SnO₂:Sb aerogel supports: does V addition play an active role in electrocatalysis?

Abstract

Aerogel is introduced as an OER catalyst substrate for PEM electrolyzer and shows superior activity.

Ir nanoparticles with ultrahigh dispersion as oxygen evolution reaction (OER) catalysts: synthesis and activity benchmarking

“…However, Sb-, F-and In-tin oxides present decent stability and conductivity and are considered promising candidates. [15][16][17][18][19] Titania is stable during operation thanks to its semiconducting nature and has already been tested. 14,19,20 However, high Ir loading is required to allow electron conduction via an IrO 2 film.…”

“…With the presented approach, it is demonstrated that the Ir NP display a remarkable ECSA as well as when activated, SA and MA for the OER, which outperform reported state-of-the-art catalysts by a factor of up to ten. 16,20,23,24 It is highlighted that the performance enhancement achieved by synthesizing the Ir NP via our recently introduced colloidal approach 21 is due to their extremely high dispersion laying the foundation for supported OER catalysts.…”

Comprehensive investigation of novel pore-graded gas diffusion layers for high-performance and cost-effective proton exchange membrane electrolyzers

“…5 Reduction of the precious metal content by improving the activity of the electrocatalytic properties is a high priority and is in the focus of our research efforts as well as several other groups. [6][7][8][9][10][11][12][13][14][15] However, the catalysts currently have a relatively small influence on the capital cost.…”

Highly active nano-sized iridium catalysts: synthesis and operando spectroscopy in a proton exchange membrane electrolyzer

“…In terms of availability, the issue of using high loadings of Ir in membrane electrode assemblies (MEAs) is one of the most important research topics in PEM electrolysis. The target is to increase the electrocatalytic activity by the use of supporting materials, † 11 – 16 changing the crystalline structure, 17 – 19 optimizing the electrochemical active surface area 20 – 23 and to understand the degradation mechanism for such materials 24 , 25 to decrease the required amount of Ir in highly efficient PEM electrolyzer systems.…”