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Poly(Alkyl‐Terphenyl Piperidinium) Ionomers and Membranes with an Outstanding Alkaline‐Membrane Fuel‐Cell Performance of 2.58 W cm −2
Author(s) -
Chen Nanjun,
Hu Chuan,
Wang Ho Hyun,
Kim Sun Pyo,
Kim Hae Min,
Lee Won Hee,
Bae Joon Yong,
Park Jong Hyeong,
Lee Young Moo
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202013395
Subject(s) - membrane , materials science , terphenyl , polymer chemistry , chemical engineering , ultimate tensile strength , alkyl , barrer , conductivity , alkaline fuel cell , copolymer , ion exchange , chemistry , composite material , ion , organic chemistry , permeability (electromagnetism) , polymer , biochemistry , engineering
Aryl‐ether‐free anion‐exchange ionomers (AEIs) and membranes (AEMs) have become an important benchmark to address the insufficient durability and power‐density issues associated with AEM fuel cells (AEMFCs). Here, we present aliphatic chain‐containing poly(diphenyl‐terphenyl piperidinium) (PDTP) copolymers to reduce the phenyl content and adsorption of AEIs and to increase the mechanical properties of AEMs. Specifically, PDTP AEMs possess excellent mechanical properties (storage modulus>1800 MPa, tensile strength>70 MPa), H 2 fuel‐barrier properties (<10 Barrer), good ion conductivity, and ex‐situ stability. Meanwhile, PDTP AEIs with low phenyl content and high‐water permeability display excellent peak power densities (PPDs). The present AEMFCs reach outstanding PPDs of 2.58 W cm −2 (>7.6 A cm −2 current density) and 1.38 W cm −2 at 80 °C in H 2 /O 2 and H 2 /air, respectively, along with a specific power (PPD/catalyst loading) over 8 W mg −1 , which is the highest record for Pt‐based AEMFCs so far.