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Protonic ceramic electrochemical cells for hydrogen production and electricity generation: exceptional reversibility, stability, and demonstrated faradaic efficiency

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/c8ee02865f· OSTI ID:1613625
 [1];  [2];  [2]
  1. Northwestern Univ., Evanston, IL (United States); Kumoh National Institute of Technology, Gumi (Korea, Republic of); DOE/OSTI
  2. Northwestern Univ., Evanston, IL (United States)
Here, we demonstrate exceptional performance for steam electrolysis at intermediate temperatures (500–650 °C) using protonic ceramic electrolyte cells comprised of the proton-permeable, high-activity mixed conductor PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) as the air electrode, the highly proton-conductive and chemically stable perovskite oxide BaZr0.4Ce0.4Y0.1Yb0.1O3 (BZCYYb4411) as the electrolyte, and a composite of Ni–BZCYYb4411 as the fuel electrode. Cells constructed from this material set have been shown previously to function efficiently in fuel cell mode. We demonstrate here reversible operation, enabling hydrogen production when excess electricity is available and immediate electricity generation from stored hydrogen when power demand is high. The cells are stable under cyclic operation and also under prolonged continuous operation in electrolysis mode, undergoing minimal loss in electrochemical characteristics after 500 h at 550 °C. Microstructurally optimized cells yield a remarkable current density of -1.80 A cm-2 at 600 °C and an operating voltage of 1.3 V, of which, based on an electrochemically deduced faradaic efficiency of 76%, -1.37 A cm-2 contributes to useful hydrogen.
Research Organization:
United Technologies Corporation, Farmington, CT (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000498
OSTI ID:
1613625
Alternate ID(s):
OSTI ID: 1488346
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 1 Vol. 12; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Progress Report on Proton Conducting Solid Oxide Electrolysis Cells journal July 2019
Determination of partial conductivities and computational analysis of the theoretical power density of BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3−δ (BZCYYb1711) electrolyte under various PCFC conditions journal January 2019
Highly active and durable double-doped bismuth oxide-based oxygen electrodes for reversible solid oxide cells at reduced temperatures journal January 2019

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