Citation: Jiaqi Lin, Pupu Yang, Yimin Jiang, Shiqian Du, Dongcai Zhang, Gen Huang, Jinbo Wang, Jun Wang, Qie Liu, Miaoyu Li, Yujie Wu, Peng Long, Yangyang Zhou, Li Tao, Shuangyin Wang. Surface decoration prompting the decontamination of active sites in high-temperature proton exchange membrane fuel cells[J]. Chinese Chemical Letters, ;2024, 35(11): 109435. doi: 10.1016/j.cclet.2023.109435 shu

Surface decoration prompting the decontamination of active sites in high-temperature proton exchange membrane fuel cells

Jiaqi Lin ^{a, 1} ,
Pupu Yang ^{a, 1} ,
Yimin Jiang ^{a, 1} ,
Shiqian Du ^a ,
Dongcai Zhang ^a ,
Gen Huang ^a ,
Jinbo Wang ^a ,
Jun Wang ^a ,
Qie Liu ^a ,
Miaoyu Li ^a ,
Yujie Wu ^a ,
Peng Long ^{a, c} ,
Yangyang Zhou ^{a, b, *,} ,
Li Tao ^{a, *,} ,
Shuangyin Wang ^a

a.
Research Institute of Hunan University in Chongqing, Chongqing 401120, China
b.
College of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China
c.
KBC Hydrogen Energy Technology Co., Ltd., Yiyang 413100, China

yangyangzhou@jxstnu.edu.cn

taoli@hnu.edu.cn

Received Date: 27 November 2023
Revised Date: 12 December 2023
Accepted Date: 19 December 2023
Available Online: 20 December 2023

Figures(5)

In electrochemical energy devices, the operating conditions always exert enormous influence on electrocatalysts' performances. Phosphoric acid (PA), acted as the proton carriers, can be adsorbed on Pt surface, block active sites and affect the electronic structure of Pt unfavorably, which severely restricts the performance of high-temperature proton exchange membrane fuel cells (HT-PEMFCs). Herein, simply basic organic compounds, such as dicyandiamide (DCD), melamine (Mel) and cyanuric acid (CA), are decorated on Pt surface (DCD-Pt/C, Mel-Pt/C and CA-Pt/C) to induce the adsorption transfer of proton carriers. The decoration can not only inject electrons to Pt and enhance oxygen reduction reaction (ORR) activity but also can induce PA to transfer from Pt surface to organic compounds, decontaminating active sites. In addition, the organic compounds with the larger conjugated system and the smaller electronegativity of ligating atoms would have a greater interaction with Pt, causing a larger decoration amount on Pt surface, which leads to more excellent ORR activity and resistance to PA blockage effect. Therefore, Mel-Pt/C shows a peak power density of 629 mW/cm², exceeding commercial Pt/C (437 mW/cm²), DCD-Pt/C (539 mW/cm²) and CA-Pt/C (511 mW/cm²) with the same loading.
- High-temperature proton exchange membrane fuel cells,
- Decontamination of active sites,
- Oxygen reduction reaction,
- Surface decoration,
- Adsorption transfer
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