Research Symposium

BIO

John Ryan (JR) Polisknowski is a junior at Florida State University pursuing a Bachelor of Science in Mechanical Engineering. Originally from Tampa, this is his second year at Florida State University. Along with his major, he is completing minors in Mathematics and Art, reflecting both his technical interests and creative side.
Polisknowski previously conducted research through the Undergraduate Research Opportunity Program (UROP) at Tallahassee State College with faculty mentor Joseph McNeil, where he worked on hydrogen engine research and developed an early interest in hydrogen-based energy systems.
He is currently involved in a UROP research project at Florida State University with mentors Julian Long and Cat Fidd. His research examines hydrogen as a clean energy carrier for next-generation power systems, focusing on how hydrogen exposure affects oxide stability and surface chemistry in refractory metals such as niobium and tantalum at high temperatures.
Outside of academics, Polisknowski enjoys photography and creative projects that combine visual design with technical thinking. He also enjoys working on hydrogen-related engineering ideas and learning about emerging energy technologies. He plans to pursue Florida State University’s combined Bachelor of Science to Master’s program in Mechanical Engineering.

High-Temperature Hydrogen Effects on Oxide Stability and Surface Evolution in Refractory Metal

Abstract

Hydrogen is increasingly recognized as a clean energy carrier for next-generation power systems due to its potential to reduce carbon emissions. Hydrogen turbines, which operate at extremely high temperatures exceeding 1200 °C, require materials capable of maintaining mechanical strength, resisting oxidation, and remaining stable under thermal stress. Refractory metals such as niobium (Nb) and tantalum (Ta) are promising candidates for these applications because of their high melting points and excellent thermal stability. However, exposure to hydrogen can compromise protective oxide layers and modify surface chemistry, which may influence friction, wear behavior, and overall material performance. Despite their importance, the critical temperature thresholds for oxide reduction and the relationships between hydrogen-induced surface changes and tribological performance are not well understood. This study investigates the effects of hydrogen exposure on oxide stability and surface chemistry in refractory metals under high-temperature conditions. Using controlled hydrogen environments, the research characterizes changes in surface composition and examines their implications for mechanical performance and material longevity. Results from this study aim to provide insight into the selection and design of refractory metals for hydrogen energy systems and contribute to the development of more reliable, high-performance materials for clean energy technologies.

Keywords: hydrogen, Oxide Stability, Refractory Metals, Engineering