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Title: Temperature-Dependent Kinetic Study of Ammonia Oxidation Reaction on Gas Diffusion Electrodes in NH 3-Saturated 1 M KOH Solutions

Abstract

Ammonia oxidation reaction (AOR) is sluggish, especially at ambient temperature. To make kinetic study in electrochemical cell more informative and relevant to the catalysts’ performance in direct ammonia fuel cells (DAFCs) operating at about 100°C, it is desirable to study the AOR kinetics at elevated temperatures. However, ammonia evaporation accelerates with increasing temperature causing decrease of ammonia concentration with time. Here, we show a feasible solution to this issue - let argon gas bubble through concentrated ammonia before entering the electrochemical cell so that the solution can be kept ammonia saturated and oxygen free. Repeatable AOR polarization curves were obtained at temperatures up to 60°C. The AOR activities are characterized by the average currents at 0.5 V versus RHE measured at 20 mV s-1 in potential cycles below the potential of peak current. For PtIr/C, the PGM mass activities are 25 A g-1 at 25°C and 225 A g -1 at 60°C. The results for Pt/C and Ir/C and discussion of the causes for their distinct kinetic behavior will be presented at the meeting.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States). Chemistry Division and Energy and Photon Sciences Directorate
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
OSTI Identifier:
1430851
Report Number(s):
BNL-203371-2018-JAAM
Journal ID: ISSN 1938-5862
Grant/Contract Number:  
SC0012704; AR0000805
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ECS Transactions
Additional Journal Information:
Journal Volume: 85; Journal Issue: 12; Journal ID: ISSN 1938-5862
Publisher:
Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 25 ENERGY STORAGE; 30 DIRECT ENERGY CONVERSION

Citation Formats

Liang, Z., Song, L., Ma, Z., Zhang, Y., Adzic, R.R., and Wang, Jia X.. Temperature-Dependent Kinetic Study of Ammonia Oxidation Reaction on Gas Diffusion Electrodes in NH3-Saturated 1 M KOH Solutions. United States: N. p., 2018. Web. doi:10.1149/08512.0161ecst.
Liang, Z., Song, L., Ma, Z., Zhang, Y., Adzic, R.R., & Wang, Jia X.. Temperature-Dependent Kinetic Study of Ammonia Oxidation Reaction on Gas Diffusion Electrodes in NH3-Saturated 1 M KOH Solutions. United States. doi:10.1149/08512.0161ecst.
Liang, Z., Song, L., Ma, Z., Zhang, Y., Adzic, R.R., and Wang, Jia X.. Sun . "Temperature-Dependent Kinetic Study of Ammonia Oxidation Reaction on Gas Diffusion Electrodes in NH3-Saturated 1 M KOH Solutions". United States. doi:10.1149/08512.0161ecst.
@article{osti_1430851,
title = {Temperature-Dependent Kinetic Study of Ammonia Oxidation Reaction on Gas Diffusion Electrodes in NH3-Saturated 1 M KOH Solutions},
author = {Liang, Z. and Song, L. and Ma, Z. and Zhang, Y. and Adzic, R.R. and Wang, Jia X.},
abstractNote = {Ammonia oxidation reaction (AOR) is sluggish, especially at ambient temperature. To make kinetic study in electrochemical cell more informative and relevant to the catalysts’ performance in direct ammonia fuel cells (DAFCs) operating at about 100°C, it is desirable to study the AOR kinetics at elevated temperatures. However, ammonia evaporation accelerates with increasing temperature causing decrease of ammonia concentration with time. Here, we show a feasible solution to this issue - let argon gas bubble through concentrated ammonia before entering the electrochemical cell so that the solution can be kept ammonia saturated and oxygen free. Repeatable AOR polarization curves were obtained at temperatures up to 60°C. The AOR activities are characterized by the average currents at 0.5 V versus RHE measured at 20 mV s-1 in potential cycles below the potential of peak current. For PtIr/C, the PGM mass activities are 25 A g-1 at 25°C and 225 A g-1 at 60°C. The results for Pt/C and Ir/C and discussion of the causes for their distinct kinetic behavior will be presented at the meeting.},
doi = {10.1149/08512.0161ecst},
journal = {ECS Transactions},
number = 12,
volume = 85,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2018},
month = {Sun Apr 01 00:00:00 EDT 2018}
}

Journal Article:
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