Triptycene Branched Poly(aryl‐co‐aryl piperidinium) Electrolytes for Alkaline Anion Exchange Membrane Fuel Cells and Water Electrolyzers

Author:

Hu Chuan1ORCID,Kang Na Yoon1ORCID,Kang Hyun Woo2ORCID,Lee Ju Yeon3ORCID,Zhang Xiaohua1ORCID,Lee Yong Jun1ORCID,Jung Seung Won1,Park Jong Hyeong1ORCID,Kim Myeong‐Geun3ORCID,Yoo Sung Jong345ORCID,Lee So Young3ORCID,Park Chi Hoon2ORCID,Lee Young Moo1ORCID

Affiliation:

1. Department of Energy Engineering College of Engineering Hanyang University Seoul 04763 Republic of Korea

2. Department of Energy Engineering Gyeongsang National University Jinju 52725 Republic of Korea

3. Hydrogen⋅Fuel Cell Research Center Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea

4. Division of Energy & Environment Technology KIST School, University of Science and Technology (UST) Daejeon 34113 Republic of Korea

5. KHU-KIST Department of Converging Science and Technology Kyung Hee University Seoul 02447 Republic of. Korea

Abstract

AbstractAlkaline polymer electrolytes (APEs) are essential materials for alkaline energy conversion devices such as anion exchange membrane fuel cells (AEMFCs) and water electrolyzers (AEMWEs). Here, we report a series of branched poly(aryl‐co‐aryl piperidinium) with different branching agents (triptycene: highly‐rigid, three‐dimensional structure; triphenylbenzene: planar, two‐dimensional structure) for high‐performance APEs. Among them, triptycene branched APEs showed excellent hydroxide conductivity (193.5 mS cm−1@80 °C), alkaline stability, mechanical properties, and dimensional stability due to the formation of branched network structures, and increased free volume. AEMFCs based on triptycene‐branched APEs reached promising peak power densities of 2.503 and 1.705 W cm−2 at 75/100 % and 30/30 % (anode/cathode) relative humidity, respectively. In addition, the fuel cells can run stably at a current density of 0.6 A cm−2 for 500 h with a low voltage decay rate of 46 μV h−1. Importantly, the related AEMWE achieved unprecedented current densities of 16 A cm−2 and 14.17 A cm−2 (@2 V, 80 °C, 1 M NaOH) using precious and non‐precious metal catalysts, respectively. Moreover, the AEMWE can be stably operated under 1.5 A cm−2 at 60 °C for 2000 h. The excellent results suggest that the triptycene‐branched APEs are promising candidates for future AEMFC and AEMWE applications.

Funder

Korea Evaluation Institute of Industrial Technology

National Research Foundation of Korea

Publisher

Wiley

Subject

General Chemistry,Catalysis

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