Multi-arm Branched Poly(carbazole-aryl piperidinium) Anion Exchange Membrane with High Conductivity and Good Alkaline Stability for Fuel Cells
Hui Zhang , Qiong Xiang , Xuedong Zhang , Wei Yuan , Li Li , Jianchuan Wang , Zidong Wei
Chinese Journal of Chemistry ›› 2025, Vol. 43 ›› Issue (12) : 1357 -1362.
The lack of anion exchange membranes (AEMs) with good conductivity and alkaline stability has been one of the challenges for alkaline fuel cells. Introducing branched structure was a good strategy to promote conductivity and alkaline stability due to the bigger free volume of polymer and steric hindrance of cation. Herein, a series of branched AEMs with multiple arms (four and six) were successfully prepared. Multi-arm branched AEMs demonstrated obvious improvement of conductivity and alkaline stability because of the larger free volume and steric hindrance of multi-arm branched structures, respectively. Four-arm branched B4-QPPCTP-5 exhibited best comprehensive performance, including high conductivity of 242.2 mS·cm–1, a good alkaline stability of 2000 h with hardly degradation, and high mechanical property of >40 MPa. Single fuel cell based on multi-arm branched AEMs exhibited high power output of 1.2 W·cm–2. This work provides effective theoretical guidance for polymer structure design and preparation of branched AEMs.
Branched structure / Conductivity / Alkaline stability / Anion exchange membrane / Fuel cell
2025 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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