Fuel Cell Using Squid Axon Electrolyte and Its Proton Conductivity

Area of Science:

• Biomaterials Science
• Electrochemistry
• Nanotechnology

Background:

• Biomaterial-based fuel cells offer eco-friendly energy solutions.
• Ion channels, membrane proteins, exhibit rapid ion transport capabilities.
• Potential for biomaterials in advanced in vivo electrical devices like pacemakers.

Purpose of the Study:

• To fabricate and investigate the electrical properties of a fuel cell employing an ion channel electrolyte.
• To demonstrate the feasibility of ion channels as high-proton conductivity electrolytes.
• To explore the performance of ion channel electrolytes under varying humidity conditions.

Main Methods:

• Fabrication of a fuel cell with an ion channel membrane.
• Measurement of power density under humidified conditions.
• Investigation of ion channel function using channel blockers.
• Analysis of proton conductivity and impedance spectroscopy at different relative humidity levels.

Main Results:

• The fuel cell achieved a power density of 0.78 W/cm² under humidified conditions.
• Blocking ion channels significantly reduced power density, confirming their role.
• Proton conductivity dramatically increased above 85% relative humidity (RH), reaching 2 × 10⁻² S/m at 96% RH.
• High proton conductivity at 96% RH is attributed to ion channel activation linked to water molecule cluster fractionalization.

Conclusions:

• Ion channel membranes can function as effective electrolytes in fuel cells under humidified conditions.
• The developed fuel cell operates via the inherent function of ion channels.
• Ion channels become active above 96% RH, enabling high proton conductivity.
• Fuel cells utilizing squid axon ion channels represent a new class of devices leveraging ion channel functionality at high humidity.