資源描述:
《氮摻雜石墨烯的制備及其對(duì)氧還原反應(yīng)的電催化性能》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在應(yīng)用文檔-天天文庫。
1、萬方數(shù)據(jù)1778物理化學(xué)學(xué)報(bào)(WuliHuaxueXuebao)Acta腳,.一C%泐.Sin.2014,30(9),1778-1786September【Article]doi:10.3866/PKU.WHXB201407112www.whxb.pku.edu.crl氮摻雜石墨烯的制備及其對(duì)氧還原反應(yīng)的電催化性能彭三郭慧林‘亢曉峰(西北大學(xué)化學(xué)與材料科學(xué)學(xué)院,合成與天然功能分子化學(xué)教育部重點(diǎn)實(shí)驗(yàn)室,西安710069)摘要:以氧化石墨烯fGO)為原料、丙酮肟(DMKO)為還原劑和氮摻雜劑,采用化學(xué)還原法
2、制備了不同氮摻雜含量的石墨烯(NG)。利用場發(fā)射透射電子顯微鏡(FETEM)、紫外.可見(UV-Vis)光譜、傅里葉變換紅#I-(FTIR)光譜、X射線光電子能譜(xPs)、zeta電位和納米粒度分析、循環(huán)伏安(CV)和旋轉(zhuǎn)圓盤電極(RDE)等手段對(duì)材料的形貌、結(jié)構(gòu)、成分和電化學(xué)性質(zhì)進(jìn)行表征.結(jié)果顯示:DMKO能有效地還原GO,且通過調(diào)節(jié)G0與DMKO的質(zhì)量比,可以得到不同還原效果的NG,其氮含量范圍為4.40%一5.89%(原子分?jǐn)?shù)):GO與DMKO的質(zhì)量比為1:0.7時(shí)制備的氮摻雜石墨烯(NG.1)
3、在O:飽和O.1mol·L。KOH溶液中對(duì)氧還原反應(yīng)(ORR)的電催化性能最佳,其ORR峰電流為0.93mA·cm~,電子轉(zhuǎn)移數(shù)為3.6,這歸因于其較高含量的吡啶一N增加了材料的ORR活性位點(diǎn).此外.石墨化.N由于其較高的電子導(dǎo)電性傾向于產(chǎn)生較高的氧還原峰電流,而吡啶.N較低的超電勢傾向于產(chǎn)生較正的氧還原峰電位.與商用Pt/C相比,該材料展現(xiàn)出了優(yōu)異的抗CH。OH“跨界效應(yīng)”的特性.關(guān)鍵詞:石墨烯:氮摻雜:氧還原反應(yīng):電催化中圖分類號(hào):0646PreparationofNitrogen·DopedGra
4、pheneandItsEIectrOcatalytiCActivityforOxygenReductionReactionPENGSanGUOHui-Lin。KANGXiao—Feng(KeyLaboratoryofSyntheticandNaturalFunctionalMoleculeChemistry(MinistryofEducation),CollegeofChemistryandMaterialsScience,NorthwestUniversi拶.Xi"tin710069,PR.China
5、)Abstract:Nitrogen—dopedgraphene(NG)waspreparedbychemicalreductionofgrapheneoxide(GO)usingdimethylketoxime(DMKO)asreducinganddopingagents.Themorphologies,structures,compositions,andelectrocatalyticactivitiesoftheas..preparedmaterialswereinvestigatedusing
6、field··emissiontransmissionelectronmicroscopy(FETEM),ultraviolet.visible(UV-Vis)spectroscopy,Fourier.transforminfrared(FTIR)spectroscopy,X—rayphotoelectronspectroscopy(XPS),zetapotentialandnanoparticleanalyses。cyclicvoltammetry(cv),andtherotatingdiskelec
7、trode(RDE)method.TheresulfsshowedthatGOsheetswereeffectivelyreducedbvDMKO.NGsampleswithdifferentnitrogencontentswereObtainedbyadjustingthemassratioofGOtoDMKO:thenitrogencontentswereintherange4.40%一5.89%(atomicfraction).NG一1,obtainedusingaGOfDMKOmassratio
8、of1:O.7,showedexcellentelectrocatalytiCactivityintheoxygenreductionreaction(ORR)inan02.saturated0.1mo卜L~KOHsolution.Thepeakcurrentwas0.93mA·cm~,andthenumberofelectronstransferredper02was3.6:thiswasattributedtotheincreasei1