Catalyst evaluation for oxygen reduction reaction in concentrated phosphoric acid at elevated temperatures

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Catalyst evaluation for oxygen reduction reaction in concentrated phosphoric acid at elevated temperatures. / Hu, Yang; Jiang, Yiliang; Jensen, Jens Oluf; Cleemann, Lars Nilausen; Li, Qingfeng.

In: Journal of Power Sources, Vol. 375, 2018, p. 77-81.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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@article{97fee042f53f45f09220f85145b5a2cc,
title = "Catalyst evaluation for oxygen reduction reaction in concentrated phosphoric acid at elevated temperatures",
abstract = "Phosphoric acid is the common electrolyte for high-temperature polymer electrolyte fuel cells (HT-PEMFCs) that have advantages such as enhanced CO tolerance and simplified heat and water management. The currently used rotating disk electrode technique is limited to tests in dilute solutions at low temperatures and hence is not suitable for catalyst evaluation for HT-PEMFCs. In this study, we have designed and constructed a half-cell setup to measure the intrinsic activities of catalysts towards the oxygen reduction reaction (ORR) in conditions close to HT-PEMFC cathodes. By optimization of the hydrophobic characteristics of electrodes and the catalyst layer thickness, ORR activities of typical Pt/C catalysts are successfully measured in concentrated phosphoric acid at temperatures above 100 °C. In terms of mass-specific activities, the catalyst exhibits about two times higher activity in the half-cell electrode than that observed in fuel cells, indicating the feasibility of the technique as well as the potential for further improvement of fuel cell electrode performance.",
keywords = "Oxygen reduction, Catalyst, Half cell, High-temperature, Phosphoric acid",
author = "Yang Hu and Yiliang Jiang and Jensen, {Jens Oluf} and Cleemann, {Lars Nilausen} and Qingfeng Li",
year = "2018",
doi = "10.1016/j.jpowsour.2017.11.054",
language = "English",
volume = "375",
pages = "77--81",
journal = "Journal of Power Sources",
issn = "0378-7753",
publisher = "Elsevier B.V.",

}

RIS

TY - JOUR

T1 - Catalyst evaluation for oxygen reduction reaction in concentrated phosphoric acid at elevated temperatures

AU - Hu, Yang

AU - Jiang, Yiliang

AU - Jensen, Jens Oluf

AU - Cleemann, Lars Nilausen

AU - Li, Qingfeng

PY - 2018

Y1 - 2018

N2 - Phosphoric acid is the common electrolyte for high-temperature polymer electrolyte fuel cells (HT-PEMFCs) that have advantages such as enhanced CO tolerance and simplified heat and water management. The currently used rotating disk electrode technique is limited to tests in dilute solutions at low temperatures and hence is not suitable for catalyst evaluation for HT-PEMFCs. In this study, we have designed and constructed a half-cell setup to measure the intrinsic activities of catalysts towards the oxygen reduction reaction (ORR) in conditions close to HT-PEMFC cathodes. By optimization of the hydrophobic characteristics of electrodes and the catalyst layer thickness, ORR activities of typical Pt/C catalysts are successfully measured in concentrated phosphoric acid at temperatures above 100 °C. In terms of mass-specific activities, the catalyst exhibits about two times higher activity in the half-cell electrode than that observed in fuel cells, indicating the feasibility of the technique as well as the potential for further improvement of fuel cell electrode performance.

AB - Phosphoric acid is the common electrolyte for high-temperature polymer electrolyte fuel cells (HT-PEMFCs) that have advantages such as enhanced CO tolerance and simplified heat and water management. The currently used rotating disk electrode technique is limited to tests in dilute solutions at low temperatures and hence is not suitable for catalyst evaluation for HT-PEMFCs. In this study, we have designed and constructed a half-cell setup to measure the intrinsic activities of catalysts towards the oxygen reduction reaction (ORR) in conditions close to HT-PEMFC cathodes. By optimization of the hydrophobic characteristics of electrodes and the catalyst layer thickness, ORR activities of typical Pt/C catalysts are successfully measured in concentrated phosphoric acid at temperatures above 100 °C. In terms of mass-specific activities, the catalyst exhibits about two times higher activity in the half-cell electrode than that observed in fuel cells, indicating the feasibility of the technique as well as the potential for further improvement of fuel cell electrode performance.

KW - Oxygen reduction

KW - Catalyst

KW - Half cell

KW - High-temperature

KW - Phosphoric acid

U2 - 10.1016/j.jpowsour.2017.11.054

DO - 10.1016/j.jpowsour.2017.11.054

M3 - Journal article

VL - 375

SP - 77

EP - 81

JO - Journal of Power Sources

JF - Journal of Power Sources

SN - 0378-7753

ER -