Highly conductive fluorine-based anion exchange membranes with robust alkaline durability

Abstract

<p>Anion exchange membranes (AEMs) with robust alkaline stability and high ionic conductivity are imminently required for the promising electrochemical energy conversion devices – fuel cells.</p>

Flexible Bis-piperidinium Side Chains Construct Highly Conductive and Robust Anion-Exchange Membranes

“…Also, the same problem appeared for the stability issues. It reminds us that a high ex situ performance (including the ion conductivity and alkaline stability) may not give a corresponding in situ performance in the device. ,− Since the AEMFC is a multicomponent system, so many variables can influence the device’s output.…”

Durability of anion exchange membrane water electrolyzers

“…62 View Article Online and cross-linking. [104][105][106] Several technical challenges in the design of high IEC ionomers with low water uptake need to be addressed. First, the conductivity of low water uptake of quaternized ionomers is low which reduces the hydrogen generation rate.…”

Importance of Hydroxide Ion Conductivity Measurement for Alkaline Water Electrolysis Membranes

“…It can activate the dissociation of hydroxide ions from aqueous strong bases with alkalinity and contribute to electro-catalytic reactions at energy levels close to the theoretical voltage (i.e., 1.23 V) by lowering overpotentials, particularly ohmic overpotential that is generated during AWE reactions. Thus, the polymer electrolyte membrane is one of the vital components of AWE, which is capable of preventing direct contact with the anode and cathode, providing the hydroxide ion conductivity between the electrodes, and separating the generated gases [5][6][7][8][9][10][11]. In particular, the membrane requires high hydroxide ion conductivity to consume a low voltage per current density and efficient hydrogen production in AWE [12][13][14][15][16][17][18][19].…”

“…However, the existing analyses have been conducted only at the cell terminal of the AWE unit cells, and there has been rare research on the hydroxide-ion-conductive membrane [10]. Thus, the specific electrochemical analysis of the hydroxide-ion-conductive membrane should be urgently conducted under the actual AWE operating conditions [9].…”

“…For this purpose, several measurement methods have been developed and used to assess the electrochemical performance of the membrane. However, a measurement of the hydroxide ion conductivity of the membrane has not yet been well established, and it is generally measured indirectly by immersing the membrane in DI water [9,21]. The above measurement methods are different from the actual AWE operation conditions, so it is difficult to reflect in practice.…”