摘要： Acidic etching and Pt particle decoration were applied to modify the hydrogen absorption behavior of carbon nanotubes (CNTs). Two different acidic solutions, namely H2SO4/HNO3 and FeSO4/H2SO4/H2O2, were used for etching treatment. A novel electroless deposition process, incorporating supercritical CO2 (sc-CO2) fluid, was used to decorate finely-dispersed nano-sized Pt particles on CNTs. The hydrogen storage capacities of various modified CNTs were measured by using a high pressure thermal gravimetric microbalance (HPTGA). The experimental results showed that acidic etching could increase the surface defect density and lead to open-up of the caps of CNTs, resulting in an increase in the active adsorption site for physical sorption of H2. The electroless deposition of nano-Pt particles on CNTs, using conventional electrolyte, could promote chemical sorption of hydrogen via spillover mechanism. By employing sc-CO2 bath, the Pt particle size became much finer and more uniformly distributed on the surfaces of CNTs, giving rise to a high hydrogen storage capacity. When a hybrid process including sc-CO2 Pt decoration following acidic etching was applied to modify CNTs, a substantial enhancement of hydrogen storage capacity (about 2.7 wt%) was observed. ► Pt particle decoration onto CNTs can be performed in sc-CO2 in emulsion. ► Acidic etching can assist hydrogen entry and increase hydrogen adsorption sites. ► Combined acidic etching and Pt decoration enhance hydrogen adsorption capacity. 出版者： Kidlington: Elsevier Ltd 出版日期： 2012-04-01 出處： International journal of hydrogen energy, 2012-04, Vol.37 (8), p.6714-6720 資源來源： Elsevier ScienceDirect Journals Complete - Autoholdings 版權： 2012 Hydrogen Energy Publications, LLC. 版權： 2014 INIST-CNRS 識別號： ISSN: 0360-3199 識別號： EISSN: 1879-3487 識別號： DOI: 10.1016/j.ijhydene.2012.01.032 識別號： CODEN: IJHEDX
