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《The absolute energy positions of conduction and valence bands of selected semiconducting minerals》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、AmericanMineralogist,Volume85,pages543–556,2000TheabsoluteenergypositionsofconductionandvalencebandsofselectedsemiconductingmineralsYONGXUANDMARTINA.A.SCHOONEN*DepartmentofGeosciences,StateUniversityofNewYorkatStonyBrook,StonyBrook,NewYork11794-2100,U.S.A.ABSTRACTT
2、heabsoluteenergypositionsofconductionandvalencebandedgeswerecompiledforabout50eachsemiconductingmetaloxideandmetalsulfideminerals.Therelationshipsbetweenenergylevelsatmineralsemiconductor-electrolyteinterfacesandtheactivitiesofthesemineralsasacata-lystorphotocataly
3、stinaqueousredoxreactionsarereviewed.Thecompilationofbandedgeener-giesisbasedonexperimentalflatbandpotentialdataandcomplementaryempiricalcalculationsfromelectronegativitiesofconstituentelements.Whereasmostmetaloxidesemiconductorshavevalencebandedges1to3eVbelowtheH2
4、Ooxidationpotential(relativetoabsolutevacuumscale),energiesforconductionbandedgesarecloseto,orlowerthan,theH2Oreductionpotential.Theseoxidemineralsarestrongphoto-oxidationcatalystsinaqueoussolutions,butarelimitedintheirreducingpower.Non-transitionmetalsulfidesgener
5、allyhavehigherconductionandvalencebandedgeenergiesthanmetaloxides;therefore,valencebandholesinnon-transitionmetalsulfidesarelessoxidizing,butconductionbandelectronsareexceedinglyreducing.Mosttransition-metalsul-fides,however,arecharacterizedbysmallbandgaps(<1eV)and
6、bandedgessituatedwithinorclosetotheH2Ostabilitypotentials.Hence,boththeoxidizingpowerofthevalencebandholesandthereducingpoweroftheconductionbandelectronsarelowerthanthoseofnon-transitionmetalsulfides.INTRODUCTIONtionarisesofwhethersemiconductingmineralscouldpromote
7、Theimportanceofsyntheticsemiconductorstochemicalthesesameprocesses.Ifso,thesemineralscouldplayanim-andindustrialprocesseshasspurredalargeresearchefforttoportantroleinthefateofcontaminantsandthechemicalcom-understandthefundamentalsofphotochemicalprocessesandposition
8、sofatmosphereandhydrosphereoftheearlyearth.todevelopnewphotocatalysts.Forexample,syntheticAlthoughalltheprocessesmentionedabovearephoto-photocata
