High-powered fuel cell boosts electric-powered submersibles, drones

High-powered fuel cell boosts electric-powered submersibles, drones
Artistic representation of the pH-gradient enabled microscale bipolar interface (PMBI) created by Vijay Ramani and his lab. The two layers that make up the interface are covering the third bottom layer, which is the electrode with palladium particles on it. The submarine and drones are envisioned applications of the direct borohydride fuel cell which incorporates the PMBI. Credit: McKelvey School of Engineering

The transportation industry is one of the largest consumers of energy in the U.S. economy with increasing demand to make it cleaner and more efficient. While more people are using electric cars, designing electric-powered planes, ships and submarines is much harder due to power and energy requirements.

A team of engineers in the McKelvey School of Engineering at Washington University in St. Louis has developed a high-power that advances technology in this area. Led by Vijay Ramani, the Roma B. and Raymond H. Wittcoff Distinguished University Professor, the team has developed a direct borohydride fuel cell that operates at double the voltage of today's commercial fuel cells.

This advancement using a unique pH-gradient-enabled microscale bipolar interface (PMBI), reported in Nature Energy Feb. 25, could power a variety of transportation modes—including unmanned underwater vehicles, drones and eventually electric aircraft—at significantly lower cost.

"The pH-gradient-enabled microscale bipolar interface is at the heart of this technology," said Ramani, also professor of energy, environmental & chemical engineering. "It allows us to run this fuel cell with liquid reactants and products in submersibles, in which neutral buoyancy is critical, while also letting us apply it in higher-power applications such as drone flight."

The fuel cell developed at Washington University uses an acidic electrolyte at one electrode and an alkaline electrolyte at the other electrode. Typically, the acid and alkali will quickly react when brought in contact with each other. Ramani said the key breakthrough is the PMBI, which is thinner than a strand of human hair. Using membrane technology developed at the McKelvey Engineering School, the PMBI can keep the acid and alkali from mixing, forming a sharp pH gradient and enabling the successful operation of this system.

"Previous attempts to achieve this kind of acid-alkali separation were not able to synthesize and fully characterize the pH gradient across the PMBI," said Shrihari Sankarasubramanian, a research scientist on Ramani's team. "Using a novel electrode design in conjunction with electroanalytical techniques, we were able to unequivocally show that the acid and alkali remain separated."

Lead author Zhongyang Wang, a in Ramani's lab, added: "Once the PBMI synthesized using our novel membranes was proven to work effectively, we optimized the fuel cell device and identified the best operating conditions to achieve a high-performance fuel cell. It has been a tremendously challenging and rewarding pathway to developing the new ion-exchange membranes that has enabled the PMBI."

"This is a very promising technology, and we are now ready to move on to scaling it up for applications in both submersibles and drones," Ramani said.


Explore further

Creating longer-lasting fuel cells

More information: Zhongyang Wang et al. Efficient pH-gradient-enabled microscale bipolar interfaces in direct borohydride fuel cells, Nature Energy (2019). DOI: 10.1038/s41560-019-0330-5
Journal information: Nature Energy

Citation: High-powered fuel cell boosts electric-powered submersibles, drones (2019, February 25) retrieved 13 December 2019 from https://techxplore.com/news/2019-02-high-powered-fuel-cell-boosts-electric-powered.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
249 shares

Feedback to editors

User comments