scholarly journals RuO2 Nanorods as an Electrocatalyst for Proton Exchange Membrane Water Electrolysis

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1412
Author(s):  
Michael W. Cross ◽  
Richard P. Smith ◽  
Walter J. Varhue

A custom-built PEM electrolyzer cell was assembled using 6” stainless-steel ConFlat flanges which were fitted with a RuO2 nanorod-decorated, mixed metal oxide (MMO) ribbon mesh anode catalyst. The current density–voltage characteristics were measured for the RuO2 nanorod electrocatalyst while under constant water feed operation. The electrocatalytic behavior was investigated by making a series of physical modifications to the anode catalyst material. These experiments showed an improved activity due to the RuO2 nanorod electrocatalyst, resulting in a corresponding decrease in the electrochemical overpotential. These overpotentials were identified by collecting experimental data from various electrolyzer cell configurations, resulting in an improved understanding of the enhanced catalytic behavior. The micro-to-nano surface structure of the anode electrocatalyst layer is a critical factor determining the overall operation of the PEM electrolyzer. The improvement was determined to be due to the lowering of the potential barrier to electron escape in an electric field generated in the vicinity of a nanorod.

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 696
Author(s):  
Christoph Immerz ◽  
Boris Bensmann ◽  
Richard Hanke-Rauschenbach

Proton exchange membrane water electrolysis cells are typically operated with high water flow rates in order to guarantee the feed supply for the reaction, the hydration of the ionomer phase and to homogenize the temperature distribution. However, the influence of low flow rates on the cell behavior and the cell performance cannot be fully explained. In this work, we developed a simple 1+1-dimensional mathematical model to analyze the cell polarization, current density distribution and the water flow paths inside a cell under low stoichiometry condition. The model analysis is in strong context to previous experimental findings on low water stoichiometry operations. The presented analysis shows that the low water stoichiometry can lead to dry-out at the outlet region of the anode channel, while a water splitting reaction is also present there. The simulation results show that the supply with water in this region is achieved by a net water transport from the cathode to the anode catalyst layer resulting in higher local proton resistances in the membrane and the anode catalyst layer.


2016 ◽  
Vol 41 (34) ◽  
pp. 15124-15132 ◽  
Author(s):  
Peter Kúš ◽  
Anna Ostroverkh ◽  
Klára Ševčíková ◽  
Ivan Khalakhan ◽  
Roman Fiala ◽  
...  

2020 ◽  
Vol 4 (5) ◽  
pp. 2114-2133 ◽  
Author(s):  
Hamish Andrew Miller ◽  
Karel Bouzek ◽  
Jaromir Hnat ◽  
Stefan Loos ◽  
Christian Immanuel Bernäcker ◽  
...  

Hydrogen production using water electrolysers equipped with an anion exchange membrane, a pure water feed and cheap components (catalysts and bipolar plates) can challenge proton exchange membrane electrolysis systems as the state of the art.


2014 ◽  
Vol 39 (12) ◽  
pp. 6307-6316 ◽  
Author(s):  
Anita Skulimowska ◽  
Marc Dupont ◽  
Marta Zaton ◽  
Svein Sunde ◽  
Luca Merlo ◽  
...  

Author(s):  
Britta Mayerhöfer ◽  
Konrad Ehelebe ◽  
Florian Dominik Speck ◽  
Markus Bierling ◽  
Johannes Bender ◽  
...  

Bipolar membrane|electrode interface water electrolyzers (BPEMWE) were found to outperform a proton exchange membrane (PEM) water electrolyzer reference in a similar membrane electrode assembly (MEA) design based on individual porous...


2021 ◽  
Author(s):  
Burin Yodwong ◽  
Damien Guilbert ◽  
Wattana Kaewmanee ◽  
Matheepot Phattanasak ◽  
Melika Hinaje ◽  
...  

2018 ◽  
Vol 90 (10) ◽  
pp. 1437-1442 ◽  
Author(s):  
Sönke Gößling ◽  
Sebastian Stypka ◽  
Matthias Bahr ◽  
Bernd Oberschachtsiek ◽  
Angelika Heinzel

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