000195488 001__ 195488
000195488 005__ 20181203023408.0
000195488 0247_ $$2doi$$a10.1039/c3ee41302k
000195488 022__ $$a1754-5692
000195488 02470 $$2ISI$$a000327250300021
000195488 037__ $$aARTICLE
000195488 245__ $$aSimulations of the irradiation and temperature dependence of the efficiency of tandem photoelectrochemical water-splitting systems
000195488 269__ $$a2013
000195488 260__ $$aCambridge$$bRoyal Society of Chemistry$$c2013
000195488 300__ $$a14
000195488 336__ $$aJournal Articles
000195488 520__ $$aThe instantaneous efficiency of an operating photoelectrochemical solar-fuel-generator system is a complicated function of the tradeoffs between the light intensity and temperature-dependence of the photovoltage and photocurrent, as well as the losses associated with factors that include ohmic resistances, concentration overpotentials, kinetic overpotentials, and mass transport. These tradeoffs were evaluated quantitatively using an advanced photoelectrochemical device model comprised of an analytical device physics model for the semiconducting light absorbers in combination with a multi-physics device model that solved for the governing conservation equations in the various other parts of the system. The model was used to evaluate the variation in system efficiency due to hourly and seasonal variations in solar irradiation as well as due to variation in the isothermal system temperature. The system performance characteristics were also evaluated as a function of the band gaps of the dual-absorber tandem component and its properties, as well as the device dimensions and the electrolyte conductivity. The modeling indicated that the system efficiency varied significantly during the day and over a year, exhibiting local minima at midday and a global minimum at midyear when the solar irradiation is most intense. These variations can be reduced by a favorable choice of the system dimensions, by a reduction in the electrolyte ohmic resistances, and/or by utilization of very active electrocatalysts for the fuel-producing reactions. An increase in the system temperature decreased the annual average efficiency and led to less rapid ramp-up and ramp-down phases of the system, but reduced midday and midyear instantaneous efficiency variations. Careful choice of the system dimensions resulted in minimal change in the system efficiency in response to degradation in the quality of the light absorbing materials. The daily and annually averaged mass of hydrogen production for the optimized integrated system compared favorably to the daily and annually averaged mass of hydrogen that was produced by an optimized stand-alone tandem photovoltaic array connected electrically to a stand-alone electrolyzer system. The model can be used to predict the performance of the system, to optimize the design of solar-driven water splitting devices, and to guide the development of components of the devices as well as of the system as a whole.
000195488 700__ $$0247143$$aHaussener, Sophia$$g207354$$uEcole Polytech Fed Lausanne, Inst Engn Mech, CH-1015 Lausanne, Switzerland
000195488 700__ $$aHu, Shu$$uCALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA
000195488 700__ $$aXiang, Chengxiang$$uCALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA
000195488 700__ $$aWeber, Adam Z.$$uUniv Calif Berkeley, Lawrence Berkeley Natl Lab, Joint Ctr Artificial Photosynth, Berkeley, CA 94720 USA
000195488 700__ $$aLewis, Nathan S.$$uCALTECH, Joint Ctr Artificial Photosynth, Pasadena, CA 91125 USA
000195488 773__ $$j6$$k12$$q3605-3618$$tEnergy & Environmental Science
000195488 8564_ $$s1995786$$uhttps://infoscience.epfl.ch/record/195488/files/Haussener_2013.pdf$$yn/a$$zn/a
000195488 909C0 $$0252472$$pLRESE$$xU12656
000195488 909CO $$ooai:infoscience.tind.io:195488$$pSTI$$particle
000195488 917Z8 $$x207354
000195488 937__ $$aEPFL-ARTICLE-195488
000195488 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000195488 980__ $$aARTICLE