High efficiency CuCl electrolyzer for Cu-Cl thermochemical cycle

Rich S. Schatz, Soohyun Kim, Sanchit Khurana, Mark V. Fedkin, Serguei N. Lvov

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The Cu-Cl thermochemical cycle is a promising technology for hydrogen production due to moderate temperature requirements and compatibility with commercially demonstrated renewable heat sources, such as the solar power tower. CuCl/HCl electrolysis, the main hydrogen-producing step of the cycle, has been investigated using a newly developed electrolyzer system supplemented by a number of electrochemical characterization techniques. Nafionbased membranes and Pt/C catalysts were used to prepare membrane electrode assemblies for these tests. The anolyte contained 1 to 2 mol·L-1 CuCl dissolved in 6 mol·L-1 HCl(aq), and the catholyte was a 6 mol·L -1 HCl(aq) solution. The results of the study showed that the applied potential of 0.7 V can produce the current density around 0.5 A·cm -2 for a period of 24 hours at a temperature of 80 °C and ambient pressure. The hydrogen production efficiency was found to be at 91-99 % without any decline during the test. No copper deposition was observed after the test on any component of the electrolyzer.

Original languageEnglish (US)
Title of host publicationECS Transactions
PublisherElectrochemical Society Inc.
Number of pages12
ISBN (Electronic)9781607685395
StatePublished - 2013

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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