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Technical Electrocatalysis for PEM Electrolyzers: Addressing the Challenges of High Activity, Stability and Cost Effectiveness

Friedrich, K. Andreas and Lettenmeier, Philipp and Wang, Li and Gago, Aldo (2017) Technical Electrocatalysis for PEM Electrolyzers: Addressing the Challenges of High Activity, Stability and Cost Effectiveness. Hyceltec 6th Symposium on Hydrogen, Fuel Cells and Advanced Batteries, 19. - 23. Juni 2017, Porto, Portugal.

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Proton exchange membrane (PEM) water electrolysis (EL) is considered as one of the most promising technologies for hydrogen production from renewable energies, which has a potential to penetrate the market in near future and enable the Power-to-Gas (P2G) application on a wider scale. However, reducing capital cost of PEM electrolyzers without losing efficiency is one of its most pressing challenges. Detailed cost analysis has shown that under future scenarios with high share of renewables, limited operation of 2000-3000 h per annum electricity (OPEX) and investment cost (CAPEX) are of equal importance for P2G plants. A recent study funded by FCH-JU demonstrates that the CAPEX of PEMEL stacks – which however depends on the specific stack design – are dominated by the cost of bipolar plates. In addition also current collectors contribute also significantly to the cost of the stack whereas the catalysts are presently of minor importance. Nevertheless, there is a wide perception that the anode catalysts may be the real hindrance for this technology. One reason is the sluggish oxygen evolution reaction (OER) kinetics on most electrocatalysts and their insufficient durability due to the highly corrosive working environment. To date, Ir-based catalyst is still the only feasible option to promote OER in the anode of a PEM electrolyzer due to its high activity and considerable stability. Still, the most often used catalysts are stable but nor very active rutile IrO2. Not only the high cost of the precious metal, but also the scarcity of Ir in the earth crust are barriers on the road to commercialization of PEM electrolyzers. Therefore, highly active and stable OER catalysts in acid electrolyte with ultra-low Ir loading are required to address this issue. In the introduction the current state of the art and the work addressing cost reduction for bipolar plates and current collectors will be shortly addressed. After that the work specifically on electrocatalyst development will be presented.

Item URL in elib:https://elib.dlr.de/117822/
Document Type:Conference or Workshop Item (Speech)
Title:Technical Electrocatalysis for PEM Electrolyzers: Addressing the Challenges of High Activity, Stability and Cost Effectiveness
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Friedrich, K. Andreasandreas.friedrich (at) dlr.dehttps://orcid.org/0000-0002-2968-5029
Lettenmeier, PhilippPhilipp.Lettenmeier (at) dlr.dehttps://orcid.org/0000-0002-2822-8440
Wang, LiLi.Wang (at) dlr.deUNSPECIFIED
Gago, Aldoaldo.gago (at) dlr.deUNSPECIFIED
Date:21 June 2017
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Energy storage hydrogen Generation by electrolysis development at DLR
Event Title:Hyceltec 6th Symposium on Hydrogen, Fuel Cells and Advanced Batteries
Event Location:Porto, Portugal
Event Type:international Conference
Event Dates:19. - 23. Juni 2017
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:03 Jan 2018 15:29
Last Modified:03 Jan 2018 15:29

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