000220656 001__ 220656
000220656 005__ 20190317000511.0
000220656 0247_ $$2doi$$a10.1149/2.0661610jes
000220656 02470 $$2ISI$$a000389150900120
000220656 037__ $$aARTICLE
000220656 245__ $$aModeling of concurrent CO2 and water splitting by practical photoelectrochemical devices
000220656 269__ $$a2016
000220656 260__ $$bElectrochemical Soc Inc$$c2016$$aPennington
000220656 300__ $$a11
000220656 336__ $$aJournal Articles
000220656 520__ $$aConcurrent solar generation of hydrogen and CO through photoelectrochemical (PEC) water and CO2 electrolysis, and the subsequent use of the product gas mixture in conventional Fischer-Tropsch processes, has the potential to provide a flexible pathway for direct solar generation of a variety of liquid fuels. In order for this approach to be practical, PEC devices must be designed to continuously and selectively provide awell-defined ratio of hydrogen to CO, independent of operating conditions.We develop a computational PEC device model providing insight into the dynamics and design requirements of such a device.We investigate a variety of combinations of catalysts (Ag, Cu, Ni, Pt, Co) and photoabsorbers (Si and Ga-based) under steady and transient solar irradiation conditions. Typical H2/CO ratios of 0.1 were observed for Ag-based electrodes, and ratios of 5 when using Cu-based electrodes. Variation in catalyst and photoabsorber properties provided guidance for the development of catalysts allowing for a H2/CO product ratio close to 2. Device design variations and the addition of Ni as a second cathode-side catalyst improved the generation of hydrogen, allowing H2/CO ratios to reach between 1.7 and 2.15. Transient simulations showed that product ratios vary significantly over the day and year, implying the use of storage or controlling measures or the addition of a water gas shift reactor. Our model provides insights and practical considerations for the design and implementation of a PEC device for the concurrent production of hydrogen and CO.
000220656 700__ $$aGutierrez, Ronald
000220656 700__ $$g207354$$aHaussener, Sophia$$0247143
000220656 773__ $$j163$$tJournal of The Electrochemical Society$$k10$$qH1008-H1018
000220656 8564_ $$uhttps://infoscience.epfl.ch/record/220656/files/Gutierrez_ECS_2016.pdf$$zn/a$$s822802$$yn/a
000220656 909C0 $$xU12656$$0252472$$pLRESE
000220656 909CO $$ooai:infoscience.tind.io:220656$$qGLOBAL_SET$$pSTI$$particle
000220656 917Z8 $$x207354
000220656 917Z8 $$x207354
000220656 917Z8 $$x207354
000220656 937__ $$aEPFL-ARTICLE-220656
000220656 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000220656 980__ $$aARTICLE