Changeover of the Thermodynamic Behavior for Hydrogen Storage in Rh with Increasing Nanoparticle Size
Changeover of the Thermodynamic Behavior for Hydrogen Storage in Rh with Increasing Nanoparticle Size
复制标题
DOI：
10.1246/cl.2013.55
复制
发表时间：
2013-01-05
影响因子：
1.6
通讯作者：
Kitagawa, Hiroshi
中科院分区：
文献类型：
--
作者：
Kusada, Kohei;Kobayashi, Hirokazu;Kitagawa, Hiroshi
我们首先报告了具有超过10 nm的直径的Rh纳米颗粒的储氢性能和基于Rh纳米颗粒的粒径的储氢的温度依赖性的变化。通过氢压组成等温线和固体HNMR-H-2测量研究了储氢性能。我们证明，Rh纳米粒子的尺寸约。10 nm的Rh纳米颗粒吸收氢类似于较小的Rh纳米颗粒;然而，Rh纳米颗粒中的储氢焓随着颗粒尺寸的增加而从放热变为吸热，临界尺寸在7.1和10.5 nm之间。Rh的储氢热力学可以通过控制颗粒尺寸来调节。
We first report the hydrogen storage properties of Rh nanoparticles having a diameter over 10 nm and the change in the temperature dependences of hydrogen storage based on particle sizes of Rh nanoparticles. Hydrogen storage was investigated by hydrogen pressure composition isotherm and solid-state (HNMR)-H-2 measurements. We demonstrate that Rh nanoparticles with dimensions of ca. 10 nm absorb hydrogen similar to smaller Rh nanoparticles; however, the enthalpy of hydrogen storage in Rh nanoparticles is changed from exothermic to endothermic with increasing particle size, with a critical size between 7.1 and 10.5 nm. The thermodynamics of hydrogen storage in Rh can be tuned by controlling the particle size.