Extending the hydrogen storage limit in fullerene

Li6C60 has been cho­sen as the most rep­re­sen­ta­tive sys­tem to study the hy­dro­gena­tion mech­a­nism in al­kali-clus­ter in­ter­ca­lated ful­lerides. We pre­sent here a muon spin re­lax­ation (μSR) ex­per­i­ment that hints the chance to achieve a higher stor­age ca­pac­ity on fullerene with re­spect to the val­ues sug­gested in lit­er­a­ture. More­over, a lin­ear re­la­tion­ship be­tween the muo­nium adduct rad­i­cal hy­per­fine fre­quency and the level of C60 hy­dro­gena­tion was found and it can be ex­ploited to probe the C60 hy­dro­gena­tion level, giv­ing more credit to this tech­nique in the field of hy­dro­gen stor­age ma­te­ri­als.