CuCo/BNNSs纳米催化剂对固态储氢材料氨硼烷水解的催化性能

Catalytic Performance of CuCo/BNNSs Nanocatalysts for Hydrolysis of Solid State Hydrogen Storage Material Ammonia Borane

采用共还原法将CuCo双金属负载到通过聚乙烯吡咯烷酮(PVP)辅助离子插层法制备的少层氮化硼纳米片(BNNSs)上,获得了平均粒径为2.7 nm且高度分散的铜钴/氮化硼纳米片(CuCo/BNNSs)纳米催化剂。通过原子力显微镜(AFM)、X射线衍射(XRD)、傅里叶转换红外光谱(FTIR)、拉曼光谱(Raman)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和高分辨率透射电镜(HRTEM)对载体及催化剂的结构及形貌进行表征,并研究了CuCo/BNNSs的催化性能。研究发现,由于Cu、Co、BNNSs和OH-之间高效的四重效应协同使得Cu0.5Co0.5/BNNSs纳米催化剂在室温、pH=14条件下对氨硼烷(AB,NH3BH3)水解释氢具有极高的催化活性。转化频率(TOF)值达到104.52 molH2·molmetal^-1·min^-1,且CuCo/BNNSs纳米催化剂具有良好的稳定性,6次循环利用后仍保持较高催化活性。

CuCo bimetallic nanoparticles were supported on few layer boron nitride nanosheets(BNNSs)prepared by polyvinylpyrrolidone(PVP)-assisted ion intercalation,and a highly dispersed copper-cobalt/boron nitride nanosheets(donated as CuCo/BNNSs)nanocatalyst with an average particle size of 2.7 nm was obtained with a method of co-reduction.The structure and morphology of the carrier and catalyst were characterized by atomic force microscope(AFM),X-ray diffraction(XRD),fourier transform infrared(FTIR),Raman spectra(Raman),X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM)and high resolution transmission electron microscopy(HRTEM),and the catalytic performance of CuCo/BNNSs was studied.The results showed that Cu0.5Co0.5/BNNSs nanocatalysts exhibited high catalytic activity towards the hydrolysis of ammonia borane(AB,NH3BH3)at room temperature when pH value was 14 and the turn over frequency(TOF)reached 104.52 molH2·molmetal^-1·min^-1 due to the highly efficient quadruple synergistic effect between Cu,Co,BNNSs and OH^-.Moreover,the CuCo/BNNSs nanocatalyst also had good stability and high catalytic activity was maintained after 6 cycles.