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Title: Understanding Direct-Ammonia Protonic Ceramic Fuel Cells: High-Performance in the Absence of Precious Metal Catalysts

Journal Article · · ACS Energy Letters
 [1];  [2];  [3];  [2]; ORCiD logo [4]; ORCiD logo [2]
  1. Kumoh National Institute of Technology, Gyeongbuk (Korea, Republic of); Northwestern University, Evanston, IL (United States)
  2. Northwestern University, Evanston, IL (United States)
  3. Kumoh National Institute of Technology, Gyeongbuk (Korea, Republic of)
  4. Kumoh National Institute of Technology, Gyeongbuk (Korea, Republic of); Kumoh National Institute of Technology, Gyeongbuk (Korea, Republic of); Northwestern University, Evanston, IL (United States)

Ammonia has received considerable attention as a promising carbon-free hydrogen carrier. At temperatures above 400 °C, NH3 is thermodynamically unstable with respect to decomposition into nitrogen and hydrogen and is, thus, suitable for direct use in solid oxide fuel cells (SOFCs) without external reforming. However, poor catalytic activity for ammonia decomposition at the moderate temperatures of protonic ceramic fuel cell (PCFC) operation has resulted in low fuel cell power output relative to operation on hydrogen and likely contributes to reported cell degradation. Here we prepared cells based on a thermodynamically robust electrolyte, a high activity cathode, and an anode with a distinctive structure to overcome challenges of poor activity and stability. Furthermore, the cells delivered peak power densities of 0.59 and 0.44 W cm–2 under H2 and NH3, respectively, at 500 °C, excellent stability over a period of 200 h, and no detectable NOx in the anode exhaust gas.

Research Organization:
Northwestern University, Evanston, IL (United States)
Sponsoring Organization:
National Research Foundation (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0023450
OSTI ID:
2477680
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 11 Vol. 9; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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