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SUMMARY:Light-Driven Reactive Carbon Capture: A Journey from Photoelectroc
 hemistry to Photocatalysis
DTSTART:20231117T161500
DTEND:20231117T171500
DTSTAMP:20261005T125827Z
UID:2f4cfcdb157cff706502e4be984e5a6775c7b7431a1acdea4bf1fe6e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Shu Hu received his Ph.D. (2011) from Stanford University in M
 aterials Science and Engineering. Between 2012 and 2015\, he did postdocto
 ral work in the Department of Chemistry with Professor Nathan S. Lewis at 
 California Institute of Technology\, where he discovered coating-stabilize
 d photochemical interfaces.   Starting an independent career at Yale\, Pr
 of. Hu's work spans from photocatalysis\, semiconductor-liquid interfaces\
 , to nanoscale semiconductor synthesis and operando spectroscopy. His grou
 p is interested in sustainable chemical production and reaction engineerin
 g\, taking inputs of sunlight\, air\, and seawater.   He is on the editor
 ial board for Frontier in Chemistry. He has won a number of awards\, notab
 ly from DOE Early Career program and DOE Energy EarthShot Hydrogen program
 . A list of awards include the Journal of Materials Chemistry Young Invest
 igator Award (2018)\, ECS Energy Division Young Investigator (2019)\, Scia
 log Fellow for Negative Emission Science (2020)\, DOE Early Career Award (
 2021)\, Future Scholar Award from Global Academy of Chinese Chemical Engin
 eers (2022).\nAbstract :\nGreat strides have been made in decarbonizing ou
 r energy system\, but there are a handful of scenarios that still require 
 hydrocarbon fuels and chemicals\, such as aviation\, long-haul trucking\, 
 and shipping. Direct air capture of ~420 ppm CO2 generates carbonates but
  requires energy-intensive processes to produce pure CO2\, which\, however
 \, mostly ends up as dissolved carbonate byproducts. Seawater is dissolved
  with ~ 2mM bicarbonate and is acidifying. Thus\, one can consider convert
 ing dissolved inorganic carbon (DIC)\, including carbonate and bicarbonate
  ions\, directly to hydrocarbons.  \n               Hu la
 b at Yale investigates photocatalytic CO2 reduction (CO2R) in a DIC solut
 ion (pH > 11) with ~0 mM dissolved CO2(aq). We innovatively modulate the 1
 00-nm scale transport of protons during photocatalytic CO2R: a flux of H+
  effectively acidifies DIC species to generate CO2(aq)\, and these transi
 ent CO2(aq) molecules are long-lived enough to participate in light-driven
  CO2R. I will first elucidate the chemical physics of photocatalysis invol
 ving coupled light absorption\, charge separation\, charge transfer\, and 
 chemical transport. One-step reactive carbon capture without separating th
 e 420 ppm CO2 in the air can fulfill a circular carbon economy and mitiga
 te our society’s carbon emissions. I will reveal a pathway toward 100% p
 hoton-to-chemical conversion quantum efficiency by combining in situ poten
 tiometry\, Raman spectroscopy\, and synchrotron-based techniques.  \n 
LOCATION:BCH 2201 https://plan.epfl.ch/?dim_floor=2&lang=fr&dim_lang=fr&tr
 ee_groups=centres_nevralgiques%2Cmobilite_acces_grp%2Censeignement%2Ccomme
 rces_et_services&tree_group_layers_centres_nevralgiques=information_ep htt
 ps://epfl.zoom.us/j/84209090880
STATUS:CONFIRMED
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