High-Temperature Alkaline Water Electrolysis

Xu, Hui; Lattimer, Judith; Mohan, Yamini; McCatty, Steve

doi:10.2172/1826376

Cited by 1 publication

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“…Protective oxide coatings have also been suggested 7 and aluminized steel has been used for electrolysis using molten hydroxides. 11 For stack materials that are subject to electric potentials, the corrosion at the relevant potentials must be investigated, in addition to free corrosion. In any case, in light of the limited data, close monitoring is necessary to maintain safe conditions.…”

Section: Materials For High Temperaturementioning

confidence: 99%

“…78 A project on electrolysis using molten hydroxides at 550 °C did, unfortunately, not state any details on the catalysts employed. 11 For the catalysts which are found to be stable and suitable for HT-AE, more detailed investigation on the temperature-dependent performance, electrode fabrication and structure, stability criteria, and structure-property relationships are needed to provide basic understanding for future design and optimization. For in-depth understanding of the activity and stability of the catalysts, operando studies would be very valuable, 109 but difficult to perform given the harsh conditions.…”

Section: Materials For High Temperaturementioning

confidence: 99%

“…1,3,[6][7][8][9][10] In this work, we will focus on temperatures between 100 and 200 °C. As this is high with respect to conventional alkaline electrolysis, we will use the term high-temperature alkaline electrolysis (HT-AE), even though it is rather intermediate compared to molten hydroxide 11 or solid oxide electrolysis.…”

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confidence: 99%

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Review—Challenges and Opportunities for Increased Current Density in Alkaline Electrolysis by Increasing the Operating Temperature

Lohmann-Richters¹,

Renz²,

Lehnert³

et al. 2021

J. Electrochem. Soc.

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The highly-efficient, low-cost, large-scale production of green hydrogen by means of electrolysis is urgently needed for achieving a decarbonized energy supply. Alkaline water electrolysis is a wellestablished technology with relatively low costs which does not require scarce noble metal catalysts, but it suffers from low current densities. Increasing the operating temperature can allow this limitation to be overcome. This article summarizes both long-standing and recent developments in alkaline water electrolysis at increased temperature and sheds light on the challenges and unique opportunities of this approach. It is found that electrochemical improvements induced by higher temperature enable competitive current densities and offer unique possibilities for thermal management. The selection and development of stable materials, catalysts, and diaphragms is challenging, but some have proven long-term stability up to at least 150 °C and promising candidates are available at up to 200 °C. Further research will allow the present challenges to be overcome by understanding and improving the basic processes and components for alkaline electrolysis at increased temperature and capitalizing on its unique advantages.

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Section: Materials For High Temperaturementioning

confidence: 99%