Hydrogen retention of B4C converted graphite
Hydrogen retention of B4C converted graphite
复制标题
B4C转化石墨的氢保留
DOI：
10.1016/0022-3115(94)00596-6
复制
发表时间：
1995
影响因子：
3.1
通讯作者：
M. Akiba
中科院分区：
文献类型：
--
作者：
Y. Yamauchi;Y. Hirohata;T. Hino;T. Yamashima;T. Ando;M. Akiba
用ECR离子辐照装置研究了B_4C转化石墨的储氢性能。用热脱附光谱法（TDS）研究了氢离子辐照后的保留性能。H2解吸峰出现在350和700°C。前一个峰被认为是从B_4 C层中的B-H键释放的，后一个峰被认为是从C-H键释放的。CH 4的脱附峰出现在250和700°C。与石墨相比，B4 C的氢保持率随温度的升高而迅速下降，这是因为B-H键在300°C左右发生脱陷。在B4 C中捕获的氢的总量是石墨的1.5倍。B_4 C的H_2和CH_4脱附活化能明显高于石墨。B4 C的氢保持率在很大程度上降低了由He+离子轰击后的氢离子辐照。特别地，观察到被硼捕获的氢的还原率大。
The hydrogen retention of B4C converted graphite was investigated by using ECR ion irradiation apparatus. The retention properties were examined by a technique of thermal desorption spectroscopy (TDS) after the hydrogen ion irradiation. The H2desorption peaks appeared both at 350 and 700°C. The former peak was regarded as the detrapping from BH bondings, and the latter from CH bondings in the B4C layer. The CH4desorption peaks appeared both at 250 and 700°C. Compared with the case of graphite, the hydrogen retention of B4C rapidly decreased with the temperature, since the detrapping of BH bondings occurred around at 300°C. The total amount of trapped hydrogens in the B4C was 1.5 times larger than of the graphite. The activation energies of H2and CH4desorptions of the B4C were considerably than those of the graphite. The hydrogen retention of the B4C was largely reduced by the He+ion bombardment after the hydrogen ion irradiation. In particular, the reduction ratio for the hydrogens trapped by boron was observed to be large.