Self-sustainable protonic ceramic electrochemical cells using a triple conducting electrode for hydrogen and power production

Hanping Ding, Wei Wu, Chao Jiang, Yong Ding, Wenjuan Bian, Boxun Hu, Prabhakar Singh, Christopher J. Orme, Lucun Wang, Yunya Zhang and Dong Ding ()
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Hanping Ding: Idaho National Laboratory
Wei Wu: Idaho National Laboratory
Chao Jiang: Idaho National Laboratory
Yong Ding: Georgia Institute of Technology
Wenjuan Bian: Idaho National Laboratory
Boxun Hu: University of Connecticut
Prabhakar Singh: University of Connecticut
Christopher J. Orme: Idaho National Laboratory
Lucun Wang: Idaho National Laboratory
Yunya Zhang: Idaho National Laboratory
Dong Ding: Idaho National Laboratory

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract The protonic ceramic electrochemical cell (PCEC) is an emerging and attractive technology that converts energy between power and hydrogen using solid oxide proton conductors at intermediate temperatures. To achieve efficient electrochemical hydrogen and power production with stable operation, highly robust and durable electrodes are urgently desired to facilitate water oxidation and oxygen reduction reactions, which are the critical steps for both electrolysis and fuel cell operation, especially at reduced temperatures. In this study, a triple conducting oxide of PrNi0.5Co0.5O3-δ perovskite is developed as an oxygen electrode, presenting superior electrochemical performance at 400~600 °C. More importantly, the self-sustainable and reversible operation is successfully demonstrated by converting the generated hydrogen in electrolysis mode to electricity without any hydrogen addition. The excellent electrocatalytic activity is attributed to the considerable proton conduction, as confirmed by hydrogen permeation experiment, remarkable hydration behavior and computations.

Date: 2020
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DOI: 10.1038/s41467-020-15677-z

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