Synthesis of organic hybrid ruthenium oxide nanoparticles for high-performance supercapacitors
Yan Guo, Xinyi Zou, Yuxi Wei, Lei Shu, Aiyuan Li, Jiawen Zhang, Rongrong Wang
Abstract
Ruthenium oxide has long been considered as an excellent pseudocapacitive electrode material with high specific capacitance and high energy density , but suffers from poor electrochemical stability. In this work, the capacitive performance and electrochemical stability of RuO 2 are significantly enhanced by applying hybrid RuO 2 materials, which are prepared by precipitation reaction using RuCl 3 in the presence of polyhydroxy organic molecules. RuO 2 wrapped by sorbitol and tween is defined as RuO 2 @S+T, and by glucose and tween is defined as RuO 2 @G+T. It is shown that the specific capacitances of RuO 2 @S+T and RuO 2 @G+T at 1 A g −1 are 1865.7 and 1792.0 F g −1 , much larger than the 602.6 F g −1 of pristine RuO 2 . The improvement in electrochemical stability is also evident, with the capacitance retention of 93.9% and 90.2% for RuO 2 @S+T and RuO 2 @G+T, respectively, after 8000 charging-discharging cycles, which is much more stable than the 30.2% for pristine RuO 2 . This improvement can be attributed to the small size and uniform distribution of RuO 2 @S+T and RuO 2 @G+T nanoparticles that facilitate proton and electron transfer , as well as the surrounding organic molecules that can stabilize RuO 2 structure and also facilitate proton transfer . The hybrid RuO 2 material used in this work could be extended to design and invent stable electrode materials for high-performance supercapacitors .