| The continuous accumulation of hydrogen in a closed environment will cause hydrogen corrosion and even explosion in the container,so irreversible hydrogen absorption materials show great application prospects.The irreversible hydrogen absorption system is usually composed of unsaturated organic matter,a catalyst,and a catalyst carrier.In order to improve the environmental adaptability of hydrogen absorption materials,it is necessary to use polymers as carriers.Silicone rubber has become an excellent carrier of hydrogen absorption material because of its excellent chemical stability and gas permeability.In the second chapter,with the help of active oxygen functional groups on graphene oxide(GO).Silanized graphene(SGO)was successfully obtained by grafting polysiloxane on the surface of GO.Using SGO-supported palladium(Pd)catalyst can increase the active sites of the catalyst,improve the compatibility between the catalyst carrier and silicone rubber,and effectively improve the catalytic performance.Polymethyl vinyl siloxane is used as the main chain of silicone rubber,which makes silicone rubber have hydrogen absorption performance as a matrix material,and polysiloxane is crosslinked into silicone rubber under the crosslinking effect of B2O3,which gives silicone rubber unique B-O dynamic bonds and shows excellent selfhealing performance.Through the hydrogen absorption test,it was found that the hydrogen absorption capacity of silicone rubber with Pd/SGO increased by 45.65%compared with commercial catalyst Pd/C,which was attributed to the good compatibility of SGO with silicone rubber and its good anchoring effect on Pd nanoparticles.In the third chapter,polysiloxane,water,and emulsifier were ultrasonically formed into the emulsion,and 1,4-bis(phenylalkynyl)benzene(DEB)and Pd/C were added as hydrogen getters.Under the catalysis of platinum(Pt0),silicone rubber was formed by hydrosilylation cross-linking polysiloxane,and a series of porous silicone rubber composites were obtained by freeze-drying.Silicone rubber has a porous structure,which can increase the diffusion rate of hydrogen in the silicone rubber,thus improving the hydrogen absorption efficiency.With the addition of water,the pore size and distribution density increase,and the porous frame of porous silicone rubber is gradually improved,so the hydrogen absorption capacity and hydrogen absorption rate also increase greatly(the maximum hydrogen absorption capacity increases by 243.4%at 1300 min),and the actual hydrogen absorption capacity is getting closer to the theoretical saturated hydrogen absorption capacity.To sum up,in this paper,silicone rubber is used as the matrix of the hydrogen absorption material,and the hydrogen absorption performance of silicone rubber composites has been significantly improved from two aspects:modifying the catalyst carrier and endowing silicone rubber with porous structure,which provides a new design idea for hydrogen-absorbing composites. |
