光电化学测试在光催化中的应用_精品文档.pptx

1、光/电化学测试在光催化中的应用Photo/electrochemistry in Photocatalysis,范科 2016-09-09,Allen J.Bard,九阴真经,以阅读大量专业相关文献为主以目的性阅读专著为辅,干 货,电化学阻抗谱(Electrochemical Impedance Spectrum,EIS)光电化学电池测试(Photoelectrochemical Cell,PEC)电催化表征(Electrocatalysis),电化学阻抗谱(Electrochemical Impedance Spectrum,EIS),I=,欧姆定律,我是华丽的分割线,EIS 向量,a,b,

2、c=a+bj,c2=a2+b2,c,Z,Z,Z,Z=Z+Zj,Z2=Z2+Z2,如何读图(界面！界面！界面！重要的事情说三遍！),0.7,62,Nature Communications 2016,7,11981,坐标轴起点从(0,0)开始 横坐标与纵坐标尺度保持一致严禁用软件模拟替代试验测试结果,WHY?,如何画图,严重差评,the Nyquist plots exhibit a depressed semi-circle at the high frequency range,followed by a linear slope in the low frequency region,wh

3、ich is called Warburg resistance resulting from the frequency dependence of ions diffusion/transport in the electrolyte.The equivalent series resistance(ESR)of the electrode can be obtained from the x intercept of the Nyquist plot.The ESR of NiMoO4 and CoMoO4 electrode are 3.48 and 3.59,respectively

4、.The diameter of semi-circle corresponds to the charge transfer resistance caused by Faradic reactions in parallel with the double-layer capacitance at the electrode electrolyte interface.According to the enlarged plots,the size of the semicircle,which equals the charge transfer resistance Rct,is sm

5、aller for the NiMoO4 electrode(0.8)compared to that of the CoMoO4 electrode(1.2),indicating that the binder-free electrode design could greatly improve the conductivity,thus leading to enhanced electrochemical properties.(Nanoscale,2016,8,13273-13279),光电化学电池测试Photoelectrochemical Cell,PEC,三电极体系,（此处非

6、硬广，请自觉无视水印）,J.Am.Chem.Soc.,2014,136(7),pp 28432850,J.Am.Chem.Soc.,2010,132(21),pp 74367444,Chem.Sci.,2011,2,737-743,Fe2O3,Data from Michael Gratzels group,not published,J.Phys.Chem.C 2012,116,2670726720,Charge transfer rate=Jss/Jinst,Adv.Funct.Mater.2016,26,44354443,扣除暗电流不能使用牺牲试剂,J.Am.Chem.Soc.,2014

7、,136(7),pp 28432850,电催化测试（光催化助催化剂的性能表征）Electrocatalysis(co-catalysts for photocatalysis),We are family,C3N4 TiO2 ZnO WO3 BiVO4 CdS TaxOyN,Pt Pd NixS NixFeyS MoS2 CuxP CoxP,主,助,=,助催化剂的电化学性能表征,怒刷存在感,OverpotentialOnset potential,Tafel Slope,=a+blogj,120 mV/dec Volmer reaction,40 mV/dec Heyrovsky reacti

8、on,30 mV/dec Tafel reaction,Nature Communications 2016,7,11981,Electrochemical active surface area(ECSA),一个有意思的问题。,Rs,怎么又是我？,鲁金毛细管,欧姆电势降 iR-drop,欧姆电势降的矫正 iR-correction,Uapp=U-iRs,再举个栗子,J.Am.Chem.Soc.,2014,136(7),pp 28432850,Uapp=U-iRs,如何确定 Rs？,再次见面请多关照,Uapp=U-iRs,Im here,小 结,阻抗谱,光电测试,电催化测试,一些文献，墙裂推荐

9、（按本人心情排序，排名不分先后）,Huynh,M.,Shi,C.,Billinge,S.J.L.&Nocera,D.G.Nature of Activated Manganese Oxide for Oxygen Evolution.J.Am.Chem.Soc.137,14887-14904,doi:10.1021/jacs.5b06382(2015).,McCrory,C.C.L.,Jung,S.,Peters,J.C.&Jaramillo,T.F.Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Rea

10、ction.J.Am.Chem.Soc.135,16977-16987,doi:10.1021/ja407115p(2013).,Le Formal,F.,Sivula,K.&Grtzel,M.The Transient Photocurrent and Photovoltage Behavior of a Hematite Photoanode under Working Conditions and the Influence of Surface Treatments.The Journal of Physical Chemistry C 116,26707-26720,doi:10.1

11、021/jp308591k(2012).,McCrory,C.C.L.et al.Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices.J.Am.Chem.Soc.137,4347-4357,doi:10.1021/ja510442p(2015).,Lopes,T.,Andrade,L.,Ribeiro,H.A.&Mendes,A.Characterization of photoelectrochemical

12、 cells for water splitting by electrochemical impedance spectroscopy.Int.J.Hydrogen Energ.35,11601-11608,doi:http:/dx.doi.org/10.1016/j.ijhydene.2010.04.001(2010).,Chen,Z.et al.Accelerating materials development for photoelectrochemical hydrogen production:Standards for methods,definitions,and reporting protocols.J.Mater.Res.25,doi:http:/dx.doi.org/10.1557/JMR.2010.0020(2010).,祝大家研究生活爽，多出好成果,