摘要
以钛酸四丁酯为前驱体,采用水热法合成二氧化钛纳米片(TiO2),通过3-氨基丙基-三甲氧基硅烷(APTMS)分子对TiO2表面进行氨基修饰后,将其与Vulcan XC-72活性炭复合作为载体,吸附钯前驱体后,再进行液相还原制得Pd/TiO2/C-APTMS复合催化剂.用透射电子显微镜(TEM)、X射线能量色散谱(EDS)、电感耦合等离子体原子发射光谱(ICP-AES)、X射线衍射谱(XRD)和X射线光电子能谱(XPS)表征了催化剂的形貌、组成和结构.电化学测试结果表明,与传统液相混合还原制备的Pd/TiO2/C复合催化剂和Pd/C相比,经氨基修饰后的Pd/TiO2/C-APTMS复合催化剂在碱性溶液中对乙醇氧化具有更高的电催化活性和稳定性.
A hybrid material consisting of Vulcan XC-72 carbon and TiO2 nanosheet was fabricated as the support of Pd nanocatalysts. TiO2 nanosheets were prepared by hydrothermal method with tetrabutyl titanate as a precursor, and then modified by 3-aminopropyltrimethoxysilane（APTMS） solution, which serves as a rivet to anchor Pd2＋. Pd/TiO2/C nanocatalyst was obtained by the reduction of NaBH4. The morphology, composition and structure of the as-prepared Pd/TiO2/C-APTMS were investigated by transmission electron microscopy （TEM）, energy dispersive X-ray spectroscopy （EDS）, inductively coupled plasma-atomic emission spectros- copy （ ICP-AES）, X-ray diffraction （XRD） and X-ray photoelectron spectroscopy （XPS）. The electrochemical measurement revealed that Pd/TiO2/C-APTMS catalyst exhibited higher electrocatalytic activity and stability for ethanol electrooxidation（EOR） in alkaline media as compared to Pd/C and Pd/TiO2/C catalysts prepared by traditional liquid phase reducing method without APTMS modification. The enhanced activity and durability of Pd/TiO2/C-APTMs catalyst could be ascribed to the improved dispersion and stabilization of Pd nanoparti- cles on TiO2 nanosheet, as well as the electronic structure modificaiton induced by APTMS.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第6期1187-1193,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21103107)资助~~
关键词
氨基修饰
TiO2-C复合载体
Pd基催化剂
乙醇氧化
电催化性能
Surface modification
Carbon-titanium dioxide hybrid support
Palladium nanocatalyst
Ethanol oxidation
Electrocatalytic performance
