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Abstract:

In the quest for sustainable energy and chemical production, electrocatalysis has emerged as a transformative frontier, captivating both academia and industry. At its core lies the challenge of understanding the fundamental mechanisms that drive catalyst performance This talk dives into the nanoscale heart of electrochemistry, exploring how atomic-level or nanoscopic phenomena translate to macroscopic catalytic performance. First, I will discuss recent advancements in nanoelectrochemistry, highlighting our ability to monitor the hydrogen evolution reaction (HER) at the single Platinum nanoparticle level. Using innovative methodologies, we simultaneously quantify active sites and catalytic turnover rates within individual particles, offering a more nuanced understanding of catalyst functionality. From there, I will try to challenge the traditional interpretations of turnover number (TON), often considered a singular metric of catalytic durability. By investigating HER on individual platinum nanoparticles, we demonstrate that TON is better represented as a distribution, shaped by particle size and applied potential. This paradigm shift highlights the need to rethink catalyst design strategies, focusing on intrinsic molecular-level properties to enhance long-term performance. I鈥檒l conclude by providing exciting examples that aim to bridge the nano-scale phenomena to bulk-scale electrolysis via correlative microscopy and spectroscopy, such as fast Fourier transform electrochemical impedance and electron microscopy.

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Bio:

Dr. Lior Sepunaru received his BSc in Biology and Physics and an MSc in Electrical Engineering and Biochemistry from Tel Aviv University. He completed his Ph.D. at the Weizmann Institute of Science in 2014 under the mentorship of Prof. David Cahen and Prof. Mordechai Sheves, where he studied solid-state bioelectronics, focusing on the conduction properties of proteins and peptides. Following his doctoral work, Dr. Sepunaru pursued postdoctoral studies as a Marie Curie Research Fellow at the University of Oxford, working under Prof. Richard G. Compton to advance the field of bio-nanoelectrochemistry. Since 2017, he has led the electrochemistry lab at UC Santa Barbara, building a dynamic research group dedicated to pushing the boundaries of the field.

The Sepunaru Lab specializes in exploring the interface of electrochemistry, single-catalyst studies, and biophysical chemistry, combining experimental and theoretical approaches to address fundamental and applied scientific challenges. The lab employs cutting-edge techniques, such as SECCM, fast impedance spectroscopy, electrochemistry coupled to dynamics light scattering or circular dichroism and electron microscopy, to investigate processes like electron transfer, enzyme catalysis, and electrocatalytic activity with unprecedented sensitivity. By focusing on applications ranging from energy conversion and storage to biomedical diagnostics, the lab is driving innovation and uncovering new ways molecular-level phenomena influence broader systems.