BEGIN:VCALENDAR VERSION:2.0 PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4// BEGIN:VEVENT UID:20250510T203143EDT-05119ZtrWV@132.216.98.100 DTSTAMP:20250511T003143Z DESCRIPTION:Abstract:\n\nIn the quest for sustainable energy and chemical p roduction\, electrocatalysis has emerged as a transformative frontier\, ca ptivating both academia and industry. At its core lies the challenge of un derstanding the fundamental mechanisms that drive catalyst performance Thi s talk dives into the nanoscale heart of electrochemistry\, exploring how atomic-level or nanoscopic phenomena translate to macroscopic catalytic pe rformance. First\, I will discuss recent advancements in nanoelectrochemis try\, highlighting our ability to monitor the hydrogen evolution reaction (HER) at the single Platinum nanoparticle level. Using innovative methodol ogies\, we simultaneously quantify active sites and catalytic turnover rat es within individual particles\, offering a more nuanced understanding of catalyst functionality. From there\, I will try to challenge the tradition al interpretations of turnover number (TON)\, often considered a singular metric of catalytic durability. By investigating HER on individual platinu m nanoparticles\, we demonstrate that TON is better represented as a distr ibution\, shaped by particle size and applied potential. This paradigm shi ft highlights the need to rethink catalyst design strategies\, focusing on intrinsic molecular-level properties to enhance long-term performance. I’ ll conclude by providing exciting examples that aim to bridge the nano-sca le phenomena to bulk-scale electrolysis via correlative microscopy and spe ctroscopy\, such as fast Fourier transform electrochemical impedance and e lectron microscopy.\n\n \n\nBio:\n\nDr. 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. Mo rdechai Sheves\, where he studied solid-state bioelectronics\, focusing on the conduction properties of proteins and peptides. Following his doctora l work\, Dr. Sepunaru pursued postdoctoral studies as a Marie Curie Resear ch Fellow at the University of Oxford\, working under Prof. Richard G. Com pton to advance the field of bio-nanoelectrochemistry. Since 2017\, he has led the electrochemistry lab at UC Santa Barbara\, building a dynamic res earch group dedicated to pushing the boundaries of the field.\n\nThe Sepun aru Lab specializes in exploring the interface of electrochemistry\, singl e-catalyst studies\, and biophysical chemistry\, combining experimental an d theoretical approaches to address fundamental and applied scientific cha llenges. The lab employs cutting-edge techniques\, such as SECCM\, fast im pedance spectroscopy\, electrochemistry coupled to dynamics light scatteri ng or circular dichroism and electron microscopy\, to investigate processe s like electron transfer\, enzyme catalysis\, and electrocatalytic activit y with unprecedented sensitivity. By focusing on applications ranging from energy conversion and storage to biomedical diagnostics\, the lab is driv ing innovation and uncovering new ways molecular-level phenomena influence broader systems.\n DTSTART:20250204T180000Z DTEND:20250204T193000Z LOCATION:OM 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\, 801 rue Sherbrooke Ouest SUMMARY:Chemical Society Seminar: Lior Sepunaru- Electrocatalysis Up Close: A Nano-Scale Adventure into Sustainable Electrochemistry URL:/chemistry/channels/event/chemical-society-seminar -lior-sepunaru-electrocatalysis-close-nano-scale-adventure-sustainable-360 813 END:VEVENT END:VCALENDAR