Depressing the H <sub>2</sub>O <sub>2</sub> generation rate to enhance the durability of the hydroxide exchange membrane fuel cells
The hydroxide exchange membrane fuel cells (HEMFCs) are considered promising due to their potential low cost. However, their unsatisfied stabilities hinder the widespread application of HEMFCs. Here, we confirm that the <i>in-situ</i> generated H<sub>2</sub>O<sub>2</sub> takes serious influence on the degradation of the HEMFCs, and the more H<sub>2</sub>O<sub>2</sub> generated the worse HEMFC stability. A mixed titanium oxide and ruthenium oxide doped by niobium (TiO<sub>2</sub>-RuO<sub>2</sub>-Nb<sub>2</sub>O<sub>5</sub> (TRNO)) is synthesized and used as support for Pt to replace the commonly used carbon. The Pt/TRNO catalyst shows low H<sub>2</sub>O<sub>2</sub> yield when used as oxygen reduction reaction (ORR) catalyst. By using Pt/TRNO as cathode, the fabricated HEMFC shows outstanding long-term durability. The cell voltage only decays 2.2%, discharging at a constant current density of 500 mA·cm<sup>−2</sup> for 170 h, with a low decay rate of 76 μV·h<sup>−1</sup>. These findings reveal that H<sub>2</sub>O<sub>2</sub> yield is a key factor leading to the degradation of HEMFC, and the HEMFC stability could be improved by using the oxide supported catalysts with low H<sub>2</sub>O<sub>2</sub> yield.
Authors
- Yuchen Sheng
- Jinjie Fang
- Zhongbin Zhuang (ORCID: https://orcid.org/0000-0001-7187-1266)
- Wei Hua Zhu (ORCID: https://orcid.org/0000-0003-3240-6905)
- Shuxin Zhang
Institutions
- Shenzhen Institute of Building Research (China) (CN)
- Beijing University of Chemical Technology (CN)
Publication Details
- Journal
- Nano Research
- Published
- 2025-02-28
- DOI
- https://doi.org/10.26599/nr.2025.94907340
- Primary Topic
- Fuel Cells and Related Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- China National Petroleum Corporation
- National Key Research and Development Program of China