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Preparation and characterization of symmetrical protonic ceramic fuel cells as electrochemical hydrogen pumps
Tong, YC; Wang, Y; Cui, CS; Wang, SW; Xie, B; Peng, RR; Chen, CS; Zhan, ZL
2020-05-01
Source PublicationJOURNAL OF POWER SOURCES
ISSN0378-7753
SubtypeArticle
AbstractHere we report selective separation of high-purity H-2 from a mixture of 50%H-2-50%N-2 at reduced temperatures using novel ceramic hydrogen pumps that feature thin dense BaZr0.1Ce0.7Y0.2O3-delta (BZCY) electrolytes symmetrically sandwiched between two identical NiO-BZCY electrodes. Scanning electron microscopy observations show nanoporous nickel catalysts in the cermets as produced from in situ slow reduction. Their superior activities for hydrogen dissociation and re-association reactions are confirmed by unprecedently low interfacial polarization resistances from impedance measurements, e.g., 0.006 Omega cm(2) at 500 degrees C. The overall hydrogen permeation kinetics is largely limited by relatively slow proton transport through BZCY electrolytes. The measured H-2 fluxes range from 15.8 ml cm(-2) min(-1) at 0.68 V and 500 degrees C to 9.4 ml cm(-2) min(-1) at 1.84 V and 350 degrees C with Faradic efficiencies close to unity. Reducing the H-2 content in the feed gas decreases the H-2 fluxes as well as the upper limiting current density, above which Faradic efficiencies starts to decrease. It is further demonstrated that humidity in the sweep gas and in the H-2-rich feed gas like 50%H-2-50%N-2 does not influence the hydrogen pumping characteristics. In contrast, reducing humidity in the highly H-2-diluted feed gas like 10%H-2-90%N-2 results in a pronounced decrease in the H-2 fluxes and the upper limiting current density.
DOI10.1016/j.jpowsour.2020.228036
WOS KeywordHIGH-PERFORMANCE ; WATER-VAPOR ; CONDUCTOR ; PURIFICATION ; SEPARATION ; EXTRACTION ; ELECTRODES ; EFFICIENCY ; MEMBRANES
Language英语
WOS Research AreaChemistry ; Electrochemistry ; Energy & Fuels ; Materials Science
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28098
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Tong, YC,Wang, Y,Cui, CS,et al. Preparation and characterization of symmetrical protonic ceramic fuel cells as electrochemical hydrogen pumps[J]. JOURNAL OF POWER SOURCES,2020.
APA Tong, YC.,Wang, Y.,Cui, CS.,Wang, SW.,Xie, B.,...&Zhan, ZL.(2020).Preparation and characterization of symmetrical protonic ceramic fuel cells as electrochemical hydrogen pumps.JOURNAL OF POWER SOURCES.
MLA Tong, YC,et al."Preparation and characterization of symmetrical protonic ceramic fuel cells as electrochemical hydrogen pumps".JOURNAL OF POWER SOURCES (2020).
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