BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:MEchanics GAthering –MEGA- Seminar: Photoelectrochemical water s
 plitting under high irradiances (> 100 suns)
DTSTART:20231116T161500
DTEND:20231116T173000
DTSTAMP:20260916T125904Z
UID:1929ae271465a3e9bce677f9601271ea8beb8fe3c07f619020882698
CATEGORIES:Conferences - Seminars
DESCRIPTION:Franky Bedoya-Lora (LRESE\, EPFL)\nAbstract:\nThe production o
 f solar fuels by using concentrated irradiation allows for smaller and che
 aper devices\, and ultimately lower fuel production costs\, with the added
  benefit of increased performances if operating conditions are chosen judi
 ciously [1]. Photoelectrochemical (PEC) water splitting\, for example to p
 roduce hydrogen as a solar fuel\, has been studied mostly at room temperat
 ure and under 1 sun illumination\, hence there are still unrealized possib
 ilities for hydrogen production by using high irradiances\, for example hi
 gher than 100 suns\, where 1 sun is approx. 1 kW m-2. However\, the potent
 ially advantageous synergy between higher temperatures and irradiation\, a
 lso renders the system complex and difficult to study. The effect of tempe
 rature alone on photoelectrode performances has been reported for several 
 semiconducting materials\, e.g. Fe2O3 [2] and BiVO4 [3]\; while the effect
  of high photon fluxes has been investigated separately up to 30 suns [4].
  The combined effects of temperature and high irradiations on the performa
 nce of PEC devices has been rarely investigated experimentally\, this is m
 ostly due to the complexity of decoupling the effects due to increased sur
 face temperature\, photon fluxes and degradation rates. \n\nUnder high ir
 radiances\, two main coupled effects are to be investigated: (i) the effec
 t of temperature on the reaction kinetics and properties of the semiconduc
 tor\, and (ii) the effect of high photon fluxes on the transport of charge
  carriers and its distribution towards fuel production\, recombination or 
 photodegradation.\n\nWith the aim to address this challenge\, we developed
  a new PEC cell for operation at high irradiations\, 30 – 360 suns\, alo
 ng with a multiphysics model to predict the increased surface temperature 
 and the inevitable effects related to ohmic drop\, bubble evolution and cu
 rrent density distribution. In this talk\, the effect of high irradiances 
 on the performances of two semiconductors (BiVO4 and Fe2O3) will be presen
 ted and how their performance affects the engineering and design of photoe
 lectrochemical cells to be used under high irradiances.\n\n[1] Tembhurne\,
  S. et al. J. Electrochem. Soc. 163\, H999 (2016)\n[2] Ye\, X. et al. J. M
 ater. Chem. A 3\, 10801–10810 (2015)\n[3] Jiang\, W. et al. Appl. Catal.
  B 304\, 121012 (2022)\n[4] Segev\, G. et al. Adv. Energy Mater. 6\, 15008
 17\, (2016)\n\nBiography:\nFranky Bedoya-Lora is a postdoctoral researcher
  working at the Laboratory of Renewable Energy Science and Engineering (LR
 ESE). Currently\, his research is focused on the degradation of photoelect
 rode materials and solar fuel production under high irradiances. He obtain
 ed his PhD on electrochemical engineering and photoelectrochemistry at Imp
 erial College London (United Kingdom)\, and has a master from Universidad 
 de Antioquia (Colombia) on electrochemical methods for the assessment of a
 nticorrosive coatings. His main topics of research are electrochemical ene
 rgy storage and conversion\, electrochemical engineering and corrosion.\n
  
LOCATION:MED 2 2423 https://plan.epfl.ch/?room==MED%202%202423 https://epf
 l.zoom.us/j/67432145299?pwd=RXo4dHBQaFhFbktzYVdIa2xGOEhqUT09
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR