硼掺杂SiC的制备、表征及其可见光分解水产氢性能.pdf

《硼掺杂SiC的制备、表征及其可见光分解水产氢性能.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、物理化学学~E(WuliHuaxueXuebao)JanuaryActaP．一Chim．Sin．2014，30(1)，135-140135[Article】doi：10．3866／PKU．WHXB201311052www．whxb．pku．edu．cn硼掺杂SiC的制备、表征及其可见光分解水产氢性能董莉莉1,2王英勇童希立’靳国强’郭向云’(中国科学院山西煤炭化学研究所，煤转化国家重点实验室，太原030001；中国科学院大学，北京100049)摘要：采用原位碳热还原法制备了硼掺杂的JB．SiC(BSiC)光催化剂，并考察了其可见光下光催化分解

2、水制氢的性能．利用X射线衍射仪、X射线光电子能谱、扫描电镜及紫外一可见吸收光谱等测试方法对所制备催化剂的晶型、形貌、表面性质及能带结构进行了表征．分析结果表明，硼原子掺杂进入SiC晶格并取代了Si位点，在价带上方形成了浅受主能级，从而导致了带隙宽变窄．浅受主能级作为空穴的捕获中心可抑制光生电子和空穴的复合．因此。与SiC相比，硼掺杂SiC光催化剂在可见光下催化分解水产氢的活性大大提高．当B／Si的摩尔比为0．05时。硼掺杂SiC表现出最高的光催化产氢活性．关键词：／3-SiC；硼掺杂：光催化：产氢：可见光中图分类号：0643Synthesis

3、andCharacterizationofBoron-DopedSiCforVisibleLightDrivenHydrogenProductionDONGLi-Li’·WANGYing-Yong’’TONGXi—Li’JINGuo-Qiang’GUOXiang—Yun’(’StateKeyLaboratoryofCoalConversion，InstituteofCoalChemistry,ChineseAcademyofSciences，Taiyuan030001．PR．China；UniversityofChineseAcademyof

4、Sciences,Beo'ing100049,R．China)Abstract：Boron．doped／3．SiC(BSiC)photocatalystswerepreparedbyin—situcarbothermaIreduction，andtheirphotocatalyticperformancesforH2evolutionundervisiblelightirradiationwereinvestigated．Thecrystalstructure，surfaceproperty，morphology，andbandgapstru

5、ctureoftheBSiCphotocatalystswerestudiedusingX—raydiffraction，X-rayphotoelectronspectroscopy，scanningelectronmicroscopy，andultraviolet．visibleabsorptionspectroscopy．ThecharacterizationresultsindicatethatBatomshavedopedintotheSiCIatticeandsubstitutedSisites．1eadinglolheformat

6、ionofashallowacceptorIevelabovelhevalencebandofSiC．resultinginanarrowedbandgapenergy．TheshalowacceptorIeveIactsasaholetrap．preventingtherecombinationofphoto—excitedelectronsandholes．Therefore，thephotocatalyticH2evolutionactivityofB~opedSiCwasgreatlyimprovedcomparedwiththato

7、fSiC．ThehighesthydrogenevolutionratewasobtainedwhentheB／Simolarratiowas0．05．KeyWords：-SiC；Bdoping；Photocatalysis；Hydrogenevolution；Visiblelight1IntrOductionandrenewableresourcefortheproductionofhydrogenfue1．，PhotocatalyticproductionofhydrogenwithheterogeneousForthepurposeof

8、usingsolarenergymoreefectively,muchphotocatalystsusingsolarenergyhasattractedworld