Chemical stability of poly(phenylene oxide)-based ionomers in an anion exchange-membrane fuel cell environment

Abstract

The chemical stability of polyphenylene oxide grafted with quaternary ammonium salts, ionomers relevant for the development of practical alkaline fuel cells, is studied using hydroxide at different water microsolvation levels.

Synthesis of CeOx‐Decorated Pd/C Catalysts by Controlled Surface Reactions for Hydrogen Oxidation in Anion Exchange Membrane Fuel Cells

“…Significant progress has been achieved recently in the field of anion exchange membrane fuel cells (AEMFCs). [1][2][3] In spite of the remarkable development of this technology, the deployment of AEMFCs is still hindered by the chemical degradation of the anion exchange membrane (AEM) and ionomers, [4][5][6][7][8][9][10][11] carbonation issues, [12][13][14][15] and by the sluggish kinetics of the hydrogen oxidation reaction (HOR). [2,16,17] It has been shown that the HOR kinetics in alkaline media is two to three orders of magnitude lower than that in acidic media, [18,19] even for the most active catalysts such as Pt, [17,[19][20][21][22] Rh, [23] and Ir.…”

Electrospun Ionomeric Fibers with Anion Conducting Properties

“…The nonacidic environment of AEMFCs allows the use of nonprecious metal catalysts, which intensely reduces the cost per kilowatt of power of fuel cell devices . In spite of the latest technological progress related to electrocatalysts and to the understanding of carbonation issues, one of the main remaining challenges in the AEMFCs is the availability of good, stable anion conducting membranes that enable the hydroxide anion and water conduction through the polymeric network, both as an anion exchange membrane (AEM) and as anion exchange ionomers (AEIs).…”

The alkali degradation of LDPE-based radiation-grafted anion-exchange membranes studied using different ex situ methods

“…As well as AEM water content and water diffusivity being critical for high OH À conductivities and high AEMFC performances, [47][48][49][50][51][52][53] hydration is also key to enhancing the alkali stabilities of AEMs. 45,[54][55][56][57][58][59][60] Note, a very recent result shows that LDPE-TMA-based RG-AEMs can be successfully employed in AEMFCs at 125 C for reasonable periods of time when suitably hydrated. 61 L-AEM-TMA and L-AEM-MPY were also tested at 60 C in a RH ¼ 10% TGA test (Fig.…”