Sn掺杂对氧空位型α-Fe2O3纳米颗粒光解水性能的影响
在退火前未抽真空条件下,采用滴涂法在常压氮气氛围中退火制备了含氧空位的α-Fe2O3纳米颗粒.通过在空气和氮气氛围中退火和向前驱体溶液直接加入SnCl4制备的α-Fe2O3的方法研究了Sn掺杂对氧空位型的α-Fe2O3纳米颗粒光催化性能的影响.结果表明,氮气氛围中退火Sn掺杂得到的的α-Fe2O3在1.23V vs.RHE时的电流密度分别是氮气氛围中退火未掺杂的α-Fe2O3的35倍和空气氛围中退火Sn掺杂的α-Fe2O3的15倍,氮气氛围中退火和掺杂被证明是获得高催化性能必不可少的条件.Mott-Schottky曲线和交流阻抗谱表明,掺杂和氧空位能增大催化剂的载流子浓度的电导率.在牺牲剂溶液...
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| Published in | 电化学 Vol. 23; no. 1; pp. 21 - 27 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
28.02.2017
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| Subjects | |
| Online Access | Get full text |
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| Summary: | 在退火前未抽真空条件下,采用滴涂法在常压氮气氛围中退火制备了含氧空位的α-Fe2O3纳米颗粒.通过在空气和氮气氛围中退火和向前驱体溶液直接加入SnCl4制备的α-Fe2O3的方法研究了Sn掺杂对氧空位型的α-Fe2O3纳米颗粒光催化性能的影响.结果表明,氮气氛围中退火Sn掺杂得到的的α-Fe2O3在1.23V vs.RHE时的电流密度分别是氮气氛围中退火未掺杂的α-Fe2O3的35倍和空气氛围中退火Sn掺杂的α-Fe2O3的15倍,氮气氛围中退火和掺杂被证明是获得高催化性能必不可少的条件.Mott-Schottky曲线和交流阻抗谱表明,掺杂和氧空位能增大催化剂的载流子浓度的电导率.在牺牲剂溶液中测试发现,Sn掺杂导致材料的表面反应速率提高是催化剂活性的重要影响因素. |
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| Bibliography: | WANG Zu-hua1, NIU Dong-fang1, LI Hui-cheng1, DU Rong-bin2, XU Heng2, ZHANG Xin-sheng1 （1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237; 2. Collaborative Innovation Center for Petrochemical New Materials, A nqing 246011, A nhui） α-Fe2O3 photocatalyst; oxygen vacancy; Sn doping; surface reaction rate The α-Fe2O3 nanoparticles containing oxygen vacancies were synthesized in atmospheric N2 by dip-dropping method without a high vacuum employed before annealing.The influences of annealing atmosphere and Sn-doping on the photocatalytic performance of α-Fe2O3 nanoparticles were studied by annealing the photocatalyst in N2 or air and adding SnCl4 to the precursor directly.The results showed that the current density of Sn-doping α-Fe2O3 annealed in N2 at 550oC and 1.23 V（vs.RHE） was 35 times greater than that of pristine α-Fe2O3 annealed in N2 at 550 ℃ and 15 times greater than that of Sn-doping α-Fe2O3 annealed in air at 550 oC,which indicated that both S |
| ISSN: | 1006-3471 2993-074X |
| DOI: | 10.13208/j.electrochem.160412 |