压电材料对含铂活性炭氢气吸附性能的影响

Influence of Piezoelectric Element on Hydrogen Adsorption of Pt-supported Activated Carbon

用机械混合法制备含有不同质量分数铂的活性炭,研究了压电材料PMN-PT产生的电荷对含铂活性炭氢气吸附性能的影响。结果表明,在高压氢气条件下PMN-PT产生的电荷能增强铂和活性炭颗粒对氢气分子的吸附,并加速氢气分子的解离和氢原子的扩散,使含铂活性炭的储氢量明显提高。铂产生的氢溢流作用有效地提高了活性炭的氢气吸附量。在室温和8 MPa氢气压力条件下PMN-PT使活性炭(NAC)氢气吸附量产生的增长幅度为15%,使含有质量分数0.83%、1%和1.25%铂的活性炭氢气吸附量增长的幅度分别为36.5%、39.3%和43.9%。

Mixing Pt-coated activated carbon with secondary activated carbon as adsorbent was used for hydrogen storage.Behaviors of hydrogen adsorption on Pt-supported activated carbon in the presence of a piezoelectric element were investigated.Hydrogen storage in activated carbons can be increased by secondary hydrogen spillover from a supported Pt catalyst.The piezoelectric element is able to autogenously generate charges in hydrogen pressure.The observed adsorption enhancements of NAC,Pt/NAC-1,Pt/NAC-2 and Pt/NAC-3 are 15%,36.5%,39.3%and 43.9%,respectively.The greater enhancement observed from hydrogen adsorption on Pt/NAC samples can be attributed to charges generated by PMN-PT facilitate dissociation of hydrogen molecules into hydrogen atoms.The easier accessibility of the atomic orbital might favor the electron transfer from the atomic hydrogen to charged carbon.