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Deaglán is a PhD researcher in the field of lithium sulphur batteries and is in his fourth year with the Bernal Institute. From his passion for electrochemistry during his undergraduate degree with Coventry University to nano sensors and wastewater electrolysis, each step has edged him closer to unlocking his vast interest in advanced battery research. This project is funded by Research Ireland through the Pathway Programme. 

Deaglán’s work focuses on enhancing the practical performance of lithium sulphur batteries, which, despite their impressive theoretical energy density, face significant challenges in real-world applications. These challenges include issues related to material stability, conductivity, and cycle life.

To address these limitations, Deaglán is investigating a range of novel carbon and silicon materials for improved electrode design.  A central part of his work is the application of advanced operando characterisation, including lab-source and synchrotron techniques, to delve into the underlying charge-storage mechanisms and degradation pathways of energy storage devices. His research aims to bridge the gap between theoretical potential and practical implementation, contributing to the development of more sustainable and high-performance energy storage technologies.

Deaglán’s research is important because it supports the shift to cleaner, more reliable energy. Renewable sources like wind and solar can produce a lot of energy, but they don’t work all the time sometimes they produce too much, and other times not enough. That’s where batteries come in: they store extra energy when it’s available and release it when it’s needed.

Deaglán shares its importance further stating: “My research focuses on improving lithium sulphur batteries, which offer a promising alternative to current technologies. If we can make these batteries work well in real-world conditions, it would help us move away from fossil fuels and build a more sustainable energy system.”

I also think it’s important for countries to be able to produce and store their own energy. That way, they’re not relying on global markets, which can be unpredictable and expensive. Local energy independence could lead to more stable prices and better control over energy resources."

When asked about the support behind his research, Deaglán expresses deep appreciation for his supervisor and esteemed Bernal member, David McNulty. “I feel incredibly fortunate to have David McNulty as my supervisor. His depth of knowledge, wide-reaching network, and collaborative approach have been a huge support throughout my research. Working with someone so experienced and well-connected has made a real difference in shaping my PhD journey.”

When asked to share his experience in Bernal, Deaglán comments: “My time at Bernal has been fantastic. Being part of the wider Nanotechnology research group has made it easy to settle in everyone’s welcoming and open to sharing ideas. It’s a great environment for developing knowledge, where even casual conversations can spark new directions in your research. What I really value is the freedom to discuss your work with people outside your project; that outside perspective often leads to insights you wouldn’t get otherwise. Bernal fosters collaboration and keeps you connected to the broader research landscape, which has been incredibly valuable for my PhD journey."