An Unbalanced Battle in Excellence: Revealing Effect of Ni/Co Occupancy on Water Splitting and Oxygen Reduction Reactions in Triple‐Conducting Oxides for Protonic Ceramic Electrochemical Cells

AbstractPorous electrodes that conduct electrons, protons, and oxygen ions with dramatically expanded catalytic active sites can replace conventional electrodes with sluggish kinetics in protonic ceramic electrochemical cells. In this work, a strategy is utilized to promote triple conduction by facilitating proton conduction in praseodymium cobaltite perovskite through engineering non‐equivalent B‐site Ni/Co occupancy. Surface infrared spectroscopy is used to study the dehydration behavior, which proves the existence of protons in the perovskite lattice. The proton mobility and proton stability are investigated by hydrogen/deuterium (H/D) isotope exchange and temperature‐programmed desorption. It is observed that the increased nickel replacement on the B‐site has a positive impact on proton defect stability, catalytic activity, and electrochemical performance. This doping strategy is demonstrated to be a promising pathway to increase catalytic activity toward the oxygen reduction and water splitting reactions. The chosen PrNi0.7Co0.3O3−δ oxygen electrode demonstrates excellent full‐cell performance with high electrolysis current density of −1.48 A cm−2 at 1.3 V and a peak fuel‐cell power density of 0.95 W cm−2 at 600 °C and also enables lower‐temperature operations down to 350 °C, and superior long‐term durability.

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References

Details

Published: Jun 29, 2022
Vol/Issue: 18(30)
License: View

Authors

W

Wei Tang

Energy and Environment Science & Technology Idaho National Laboratory Idaho Falls ID 83415 USA; Department of Chemical and Materials Engineering New Mexico State University Las Cruces NM 88003 USA

H

Hanping Ding

Energy and Environment Science & Technology Idaho National Laboratory Idaho Falls ID 83415 USA

W

Wenjuan Bian

Energy and Environment Science & Technology Idaho National Laboratory Idaho Falls ID 83415 USA

C

Clarita Y. Regalado Vera

Energy and Environment Science & Technology Idaho National Laboratory Idaho Falls ID 83415 USA; Department of Chemical and Materials Engineering New Mexico State University Las Cruces NM 88003 USA

J

Joshua Y. Gomez

Energy and Environment Science & Technology Idaho National Laboratory Idaho Falls ID 83415 USA

Y

Yanhao Dong

Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

J

Ju Li

Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA; Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

W

Wei Wu

Energy and Environment Science & Technology Idaho National Laboratory Idaho Falls ID 83415 USA

W

Weiwei Fan

Department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

M

Meng Zhou

Department of Chemical and Materials Engineering New Mexico State University Las Cruces NM 88003 USA

C

Colin Gore

Redox Power Systems, LLC Beltsville MD 20705 USA

B

Bryan M. Blackburn

Redox Power Systems, LLC Beltsville MD 20705 USA

H

Hongmei Luo

Department of Chemical and Materials Engineering New Mexico State University Las Cruces NM 88003 USA

D

Dong Ding

Energy and Environment Science & Technology Idaho National Laboratory Idaho Falls ID 83415 USA

Funding

National Science Foundation Award: OIA‐2119688

Office of Energy Efficiency and Renewable Energy

U.S. Department of Energy

Cite This Article

Wei Tang, Hanping Ding, Wenjuan Bian, et al. (2022). An Unbalanced Battle in Excellence: Revealing Effect of Ni/Co Occupancy on Water Splitting and Oxygen Reduction Reactions in Triple‐Conducting Oxides for Protonic Ceramic Electrochemical Cells. Small, 18(30). https://doi.org/10.1002/smll.202201953

An Unbalanced Battle in Excellence: Revealing Effect of Ni/Co Occupancy on Water Splitting and Oxygen Reduction Reactions in Triple‐Conducting Oxides for Protonic Ceramic Electrochemical Cells

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