简介：Carbonsupportedgold-iridiumcomposite(AuIr/C)wassynthesizedbyafacileone-stepprocessandwasinvestigatedasthebifunctionalcatalystforoxygenreductionreaction(ORR)andoxygenevolutionreaction(OER).ThephysicalpropertiesoftheAuIr/Ccompositewerecharacterizedbytransmissionelectronmicroscopy(TEM),X-raydiffraction(XRD)andX-rayphotoelectronspectroscopy(XPS).AlthoughtheAuandIrintheAuIr/Cdidnotformalloy,itisclearthattheintroductionofIrdecreasestheaverageAuparticlesizeto4.2nmcomparedtothatintheAu/C(10.1nm).BysystematicalanalysisonchemicalstateofmetalsurfaceviaXPSandtheelectrochemicalresults,itwasfoundthattheAusurfacefortheAu/Ccanbeactivatedbypotentialcyclingfrom0.12Vto1.72V,resultingintheincreasedsurfaceroughnessofAu,thusimprovingtheORRactivity.Bythesamepotentialcycling,theIrsurfaceoftheIr/Cwasirreversiblyoxidized,leadingtodegradedORRactivitybutuninfluencedOERactivity.FortheAuIr/C,IrprotectsAuagainstbeingoxidizedduetothelowerelectronegativityofIr.CombiningtheadvantagesofAuandIrincatalyzingORRandOER,theAuIr/CcatalystdisplaysanenhancedcatalyticactivitytotheORRandacomparableOERactivity.Inthe50-cycleacceleratedagingtestfortheORRandOER,theAuIr/Cdisplayedasatisfiedstability,suggestingthattheAuIr/Ccatalystisapotentialbifunctionalcatalystfortheoxygenelectrode.

简介：用于有机化合物的抽取的稳固阶段的抽取(SPE)技术有创作力地在纸被用作无机的黄金的抽取。技术的二种类型被建议并且探索，也就是SPE和第四级的铵表面活化剂的liquidliquid抽取(LLE)[cetytrimethyl铵溴化物(CTMAB)，cetylpyridine溴化物(CPB)，本甲基dimethyldodecyl铵氯化物(BDMDAC)，并且dodecyltrimethyl铵氯化物(DTMAC)]。表面活化剂能与Au(CN)2到形式，离子的建筑群，和混合物能被反向阶段的结合的硅石胶化的SPE列提取。因此，SPE的一个新方法被建议与高选择，可靠性，和简洁的这些特征提取黄金。黄金的恢复率是超过98的试验性的结果表演?%，和稳固阶段的抽取列容易没被损坏，它能反复被使用。新方法能也从碱的氰化物答案被用作黄金的抽取过程。而且，纸也提出金抽取的一个新过程。

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简介：银电影(Ag)和有厚度~的silvergold电影(AgAu)15nm在通过热蒸发的Bk7眼镜上是涂的。在做5.2%的黄金以后，Ag电影的谷物尺寸从13.6把nm归结为9.1nm，也，表面粗糙从1.45nm减少到0.94nm。一盏紫外灯被用作照耀光来源在空气加速腐蚀过程。当AgAu电影更不降级时，在17h以后，照耀，纯银电影表面拐弯黑暗，和发射度从350把nm归结为500nm，几乎微不足道的在紫外放射以后。另外的X光光电子光谱学和原子力量显微图数据被提供显示出电影和他们的表面形态学的原子内容。小谷物尺寸和合金电影的高收拾行李密度在空气与氧阻止银的反应，这被建议，它导致AgAu电影的高稳定性。

简介：Recently,theirradiationeffectsinnanomaterialshavebeenahottopicinnanoscience.Althoughirradiationinduceddamageshavebeenstudyingforalongtime,verylimitedresearchhasbeenperformedonthedamagesinducedbyMeV-energyheavyionsingoldnanowires(NWs).Inthiswork,wereportastudyoftheirradiationeffectsonsinglecrystallinegoldNWs,whicharefabricatedelectrochemicallyintheetchediontracktemplates.Theas-preparedgoldNWsontheAu/CusubstratewerecharacterizedbySEMafterdissolvingthepolycarbonate(PC)template,asshowninFig.1(a).GoldNWswithdiametersfrom20to90nmwerefabricatedtostudythesizedependenceofirradiationdamageinducedbytheheavyions.ToguaranteethatthedifferentNWscouldobtainthesameirradiationfluence,theNWswithdifferentdiametersweremixedtogetherandtransferredtotheTEMgrid,asshowninFig.1(b).

简介：ThermaldecompositionofformicacidonSiO_2,CeO_2andγ-Al_2O_3wasstudiedasanelementarystepofreversewater–gasshitreaction(RWGS)oversupportedAucatalysts.γ-Al_2O_3showedthehighestCOselectivityamongthetestedoxidesinthedecompositionofformicacid.Infraredspectroscopyshowedtheformationoffourformatespeciesonγ-Al_2O_3:threeη~1-typeandoneμ~2-typespecies,andtheseformatesdecomposedtoCOat473Korhigher.Au-loadedγ-Al_2O_3sampleswerepreparedbyadepositionprecipitationmethodandusedascatalystsforRWGS.ThesupportedAucatalystgaveCOwithhighselectivityover99%fromCO_2andH_2,whichisattributedtotheformationofformatesonAuandsubsequentdecompositiontoCOonγ-Al_2O_3.