Poly(Alkyl‐Terphenyl Piperidinium) Ionomers and Membranes with an Outstanding Alkaline‐Membrane Fuel‐Cell Performance of 2.58 W cm⁻²

Abstract

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,w e 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.S pecifically,P DTP AEMs possess excellent mechanical properties (storage modulus > 1800 MPa, tensile strength > 70 MPa), H 2 fuel-barrier properties (< 10 Barrer), good ion conductivity,a nd ex-situ stability. Meanwhile,P DTP AEIs with low phenyl content and highwater permeability displaye xcellent peak power densities (PPDs). The present AEMFCs reacho utstanding PPDs of 2.58 Wcm À2 (> 7.6 Acm À2 current density) and 1.38 Wcm À2 at 80 8 8Ci nH 2 /O 2 and H 2 /air,r espectively,a long with as pecific power (PPD/catalyst loading) over 8Wmg À1 ,w hichi st he highest record for Pt-based AEMFCs so far.

High performance poly(isatin alkyl-terphenyl)s proton exchange membranes with flexible alkylsulfonated side groups

“…The proton peaks of the phenyl on the isatin appeared in the lower field due to deshielding effect of the hydrogen bonding and the N atom. 42 The polymer composition was confirmed by the integration ratios of the proton peaks. The chemical structure of PIDT-x was identified by FT-IR as shown in Figure 3(c).…”

Structures and properties of polymers in ion exchange membranes for hydrogen generation by water electrolysis

“…Another important category comprises anion exchange polyelectrolytes (whose polymer backbone is free of aryl ethers) that contain piperidinium cationic groups. For instance, Lee et al developed poly(diphenylethane‐ co ‐terphenyl piperidinium) (PDTP) for its use as ionomers and AEMs 40 . They studied the properties of anion exchange polyelectrolytes, synthesized using varying molar ratio of diphenylethane and terphenyl via acid‐catalyzed polycondensation polymerization.…”

“…(A) Poly(terphenyl piperidinium) and poly(diphenylethane‐ co ‐terphenyl piperidinium) (PDTP) based anionic polymer electrolytes. Redrawn and reproduced from Reference 40 (B) Structure of the poly(terphenyl piperidinium‐ co ‐oxindole terphenylylene) (PTPi) obtained by acid‐catalyzed copolymerization of p ‐terphenyl, isatin and N ‐methyl‐4‐piperidone. Redrawn and reproduced from Reference 41 …”

“…Most of the studies on the applicability of fluorene polymers as AEMs focused on the use of quaternary ammonium groups, due to their high hydroxide ion conductivity, durability, and feasibility. Recently, development of novel poly(fluorenyl aryl piperidinium) copolymers (as shown in Figure 7) for use as AEMs and anion exchange ionomers have been undertaken for their potential application in alkaline fuel cell 40,51 . Chen et al prepared a high molecular weight (intrinsic viscosity: 4.08 dl g −1 ) poly(fluorene‐co‐terphenyl‐N,N′‐dimethylpiperidinium) (PFTP‐13), via acid‐catalyzed polycondensation polymerization of a reaction mixture containing terphenyl, 9,9′‐dimethylfluorene and 1‐methyl‐4‐piperidone 51 .…”

Structural modification of electrode for anion exchange membrane fuel cell by controlling ionomer dispersion

“…5,6 With the development of highly conductive and stable anion conducting polymers, anion exchange membrane fuel cells (AEMFCs) have made great strides in system performance and durability in recent years and are emerging as promising low-cost alternatives to conventional PEMFCs. [7][8][9][10][11][12][13][14] However, despite the attractive advantages of AEMFCs and recent encouraging achievements, several challenges have to be overcome for AEMFCs to replace the PEMFCs successfully. [15][16][17] One of the biggest challenges is the intrinsic water imbalance in the AEMFC system.…”