纳米复合结构Pt/TiC/TiO_2催化剂的合成及催化甲醇氧化性能
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摘要
确定了水热法制备TiO_2纳米线的最佳参数,对采用最佳参数制备的TiO_2纳米线进行碳化处理,再在其表面沉积铂得到Pt/TiC/TiO_2催化剂,研究了不同阶段产物的物相组成、化学成分和微观形貌,测试了Pt/TiC/TiO_2催化剂的催化甲醇氧化能力。结果表明:最佳水热参数为NaOH溶液浓度1 mol·L-1、水热温度160℃、水热时间20h,所得TiO_2纳米线的直径约为100nm、长度超过1μm;碳化后得到了TiC/TiO_2纳米线,沉积铂后,其表面被纳米级铂颗粒所覆盖;Pt/TiC/TiO_2催化剂催化甲醇氧化的起始氧化电位(对比Ag/AgCl)为0.34V,比Pt/TiO_2催化剂催化下的负移了约0.15V,其正扫电流密度峰值比Pt/TiO_2催化剂催化下的大8倍以上,碳化明显提高了Pt/TiO_2催化剂催化甲醇氧化的能力。
Optimal parameters of TiO_2 nanowires prepared by hydrothermal method were determined.TiO_2 nanowires prepared with the optimal parameters were treated by carbonization and surface deposited with platinum,and then the Pt/TiC/TiO_2 catalyst was obtained. The phase composition, chemical composition and micromorphology of the products in different stages were investigated,and the catalytic methonal oxidation capability of Pt/TiC/TiO_2 catalyst was tested.The results show that the optimal hydrothermal parameters were listed as follows:NaOH solution concentration of 1 mol·L-1,hydrothermal temperature of 160 ℃,and hydrothermal time of 20 h.Consequently,TiO_2 nanowires with diameter of about 100 nm and length of over 1μm were obtained.The TiC/TiO_2 nanowires were obtained after carbonization and the surface was coated with platinum nanoparticles after the deposition of platinum.The initial oxidation potential of methanol oxidation catalyzed by Pt/TiC/TiO_2 catalyst was 0.34 V(vs Ag/AgCl),about 0.15 Vnegative shift compared with that by Pt/TiO_2 catalyst,and the maximum forward current density was more than 8 times as large as that by Pt/TiO_2 catalyst.The carbonization improved the catalytic methanol oxidation capability of Pt/TiO_2 catalyst significantly.
Optimal parameters of TiO_2 nanowires prepared by hydrothermal method were determined.TiO_2 nanowires prepared with the optimal parameters were treated by carbonization and surface deposited with platinum,and then the Pt/TiC/TiO_2 catalyst was obtained. The phase composition, chemical composition and micromorphology of the products in different stages were investigated,and the catalytic methonal oxidation capability of Pt/TiC/TiO_2 catalyst was tested.The results show that the optimal hydrothermal parameters were listed as follows:NaOH solution concentration of 1 mol·L-1,hydrothermal temperature of 160 ℃,and hydrothermal time of 20 h.Consequently,TiO_2 nanowires with diameter of about 100 nm and length of over 1μm were obtained.The TiC/TiO_2 nanowires were obtained after carbonization and the surface was coated with platinum nanoparticles after the deposition of platinum.The initial oxidation potential of methanol oxidation catalyzed by Pt/TiC/TiO_2 catalyst was 0.34 V(vs Ag/AgCl),about 0.15 Vnegative shift compared with that by Pt/TiO_2 catalyst,and the maximum forward current density was more than 8 times as large as that by Pt/TiO_2 catalyst.The carbonization improved the catalytic methanol oxidation capability of Pt/TiO_2 catalyst significantly.
引文
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[2]刘建国,衣宝廉,魏昭彬.直接甲醇燃料电池的原理、进展和主要技术问题[J].电源技术,2001,25(5):363-366.
[3]KAMARUDIN S K,ACHMAD F,DAUD W R W.Overview on the application of direct methanol fuel cell(DMFC)for portable electronic devices[J].International Journal of Hydrogen Energy,2009,34(16):6902-6916.
[4]张俊敏,朱芳芳,刘伟平,等.调变多元醇法制备高载量Pt/C催化剂对甲醇氧化的电催化活性[J].稀有金属材料与工程,2013,42(9):1941-1944.
[5]KNIGHTS S D,COLBOW K M,PIERRE J,et al.Aging mechanisms and lifetime of PEFC and DMFC[J].Journal of Power Sources,2004,127(1/2):127-134.
[6]黄真,林瑞,唐文超,等.二氧化钛载体在燃料电池上的研究进展[J].电源技术,2014,38(1):174-177.
[7]吴树新,马智,秦永宁,等.掺杂纳米TiO2光催化性能的研究[J].物理化学学报,2004,20(2):138-143.
[8]杨丽霞.基于二氧化钛的环境功能纳米材料制备与应用研究[D].长沙:湖南大学,2009.
[9]马淳安,俞彬,施梅勤,等.Pt/WC/TiO2催化剂的制备及其电催化性能研究[J].电化学,2011,17(2):149-154.
[10]DAS K,PANDA S K.CHAUDHURI S.Solvent-controlled synthesis of TiO21Dnanostructures:Growth mechanism and characterization[J].Journal of Crystal Growth,2017,310(16):3792-3799.
[11]肖逸帆,柳松.纳米二氧化钛的水热法制备及光催化研究进展[J].硅酸盐通报,2007,26(3):523-528.
[12]ZENG X K,WANG Z Y,WANG G,et al.Highly dispersed TiO2nanocrystals and WO3 nanorods on reduced graphene oxide:Z-scheme photocatalysis system for accelerated photocatalytic water disinfection[J].Applied Catalysis B:Environmental,2017,218:163-173.
[13]SHI T,GUO L C,HAO J J,et al.Microstructure and wear resistance of in-situ TiC surface composite coating on copper matrix synthesized by SHS and vacuum-expendable pattern casting[J].Surface&Coatings Technology,2017,324:288-297.