%0 Journal Article
%T Improvingtheefficiencyofadirectethanolfuelcellbyaperiodicloadchange
%A Andrzej Jablonski
%A Adam Lewera
%J ´ß»¯Ñ§±¨
%P 496-501
%D 2015
%R 10.1016/S1872-2067(14)60226-6
%X £¿Wepresentasimplemethodtoincreasetheefficiencyofadirectethanolfuelcellbyaperiodicmodulationoftheload(pulsedmode).Thefuelcellwasperiodicallyshortcircuitedwitharesistor(1¦¸)forafewseconds(highloadperiod)followedbyalowloadperiodofupto100swhentheresistorwasdisconnected.Theopencircuitvoltage(OCV)valuesbeforeandaftertheshortcircuitofthecellshowedanincreaseofupto70mV.ThehigherOCVwasduetotheoxidationandremovalofstronglyadsorbedCOduringtheelectricshortcircuitwhentheelectricpotentialoftheanodewasincreasedtobeclosetothecathodepotential.Thedepoisonedanodesurfacewasmuchmoreactivedirectlyaftertheshortcircuit.TheslowdecreaseoftheOCVobservedaftertheshortcircuitwascausedbythesubsequentpoisoningoftheanodesurface,whichcanbeneutralizedbyanothershortcircuit.Ingeneral,astableincreaseincellperformancewasobtainedbyrepetitionoftheelectricshortcircuit.Thedatashowedthatthepulsemodegaveanincreaseinthepowergeneratedbythedirectethanolfuelcellbyupto51%andwas6%onaverage.ItisanticipatedthatthismodeofoperationcanbeusedalsoindifferenttypesofpolymerelectrolytemembranefuelcellswhereCOpoisoningisaproblem,andafteroptimizationoftheparameters,amuchhighergaininefficiencycanbeobtained.
%K Ethanolelectrooxidation
%K Electrocatalysis
%K Directethanolfuelcell
%K Polymerelectrolytemembranefuelcell
%K Platinum
%K Platinum-ruthenium
%U http://www.chxb.cn/CN/abstract/abstract21489.shtml