Bipolar Membranes for stationary Fuel Cell,Standard

Catalog Number	ACMA00033539
Application	Stationary Fuel Cell
Feature	Standard
Moisture Content	33%-38%
Notice For Use	·Soak in 5% NaCl solution for 24 hours for pretreatment ·Use under humid conditions to avoid dryness ·Avoid excessive bending, folding and close to sharp objects ·Store in 1-36% sodium chloride solution and avoid light ·Avoid use in solutions containing oils, oxidizing substances (concentrated nitric acid, perchloric acid, etc.) and ionic high molecular weight organic compounds (surfactants, etc.)
pH Range	1.0-14
Polymer Content	15wt%
Selectivity	90%
Size	We can provide special customized size according to your requirement
Specification	Single Sheet
Thermal Stability	5°C-120°C
Total Exchange Capacity	925 g/mol
Type	Bipolar

Frontier Research

Development of Bipolar Membrane Fuel Cell (BPMFC)

Daud S S, et al. IOP Conference Series: Materials Science and Engineering.2020, 736(3), 032003.

First discovered in 2000, the bipolar membrane fuel cell (BPMFC) consists of two layers of ion-conducting membranes. Advantages of using a BPM include that each electrode can have an optimal pH, splitting, and water generation at the cation/anion interface. The combination of proton exchange membrane and anion exchange membrane can be made by hot pressing method, allowing them to carry both protons and anions in a single cell. Some polymer-based PEM and AEM materials have been selected to develop BPM, such as quaternary ammonium polysulfone (QAPSF), and quaternary ammonium polyphenylene ether (QAPPO).
Working Principle of BPMFC
· The hydrogen atom (H2) moves through the diffusion layer gas to the anode electrode, where it is split into a proton (H+) and an electron (e-) upon reaching the catalyst layer.
· The proton travels through the CEM towards the junction layer, while the electron flows through the external circuit from the anode to generate electricity.
· Simultaneously, the oxygen atom (O2) travels through the diffusion layer gas to the cathode electrode. At the cathode side catalyst layer, oxygen reduction reaction occurs in the presence of water, producing hydroxide ions (OH-).
· The hydroxide ions then move through the AEM towards the junction layer where they react with hydrogen ions to form water (H2O), causing a self-hydrating effect at the AEM/CEM junction.

Q&A

What are the two main types of membranes used in fuel cells?

Proton exchange membrane (PEM) and anion exchange membrane (AEM).

What is a bipolar membrane (BPM)?

BPM is a combination of PEM and AEM that allows both positive and negative ions to be transported simultaneously during operation.

What are some applications of BPM in the chemical industry?

Salt electrolysis, separation of mono- and divalent ions, anti-fouling, anti-deposition, water dissociation, waste recovery, and cleaning products.

What are the advantages of using BPM in fuel cells?

Each electrode can have an optimum pH, splitting, and water generation at the cation/anion interfaces.

What factors affect the behavior of BPM?

The bipolar junction structure between the anion and cation exchange membranes, and the nature of charge groups attached to the polymer matrix.

How does a BPMFC work?

Hydrogen fuel is fed to the anode side while oxygen fuel is fed to the cathode side. The hydrogen atom flows through the anode electrode, separating into proton and electron. The proton flows across the CEM toward the junction layer, while the electron flows to the external circuit. At the cathode side, oxygen reduction reaction occurs, producing hydroxide ions that flow through the AEM toward the junction layer. At the junction layer, hydrogen ions react with hydroxide ions to produce water.

What is the role of electro-osmotic drag (EOD) and diffusion mechanism in BPMFC?

They play important roles in the transportation of water molecules for hydrating the membranes.

What factors influence net water transport in BPMFC?

Properties of the coupling membranes, local relative humidity, and electric potential.

How can water management and cell performance be enhanced in BPMFC?

By modifying the BPM fabrication procedures, such as membrane thickness and water uptake properties, and its pattern.