▎ 摘　　要

Chemically reduced graphene oxide (RGO) samples prepared with three different reducing agents, such as sodium borohydride (NaBH4), hydrazine hydrate (N2H4 center dot H2O), and N, S dual-doped thiourea (CS(NH2)(2)), were prepared (respectively labeled as B-RGO, N-RGO, N/S-RGO) and compared with commercial RGO samples (represented as C-RGO). The changes of their structures and properties over time have been studied to explore the stability of electrochemical performance. Samples preserved for 0 day (fresh sample), 7 days, 30 days, and 90 days were obtained by storing the prepared RGO powder for different times under natural conditions and characterized by means of analytical methods. The results suggested that even though the phase structures and electrochemical performance of the samples were relatively stable, their surface morphology and oxidation degree varied slightly, and the electrical conductivity even changed dramatically, which decreased significantly at the initial stage of storage. It is found that among different reducing agents, N-RGO samples prepared in this work have similar stability in performance and approximate specific capacitance of around 150.0 F/g at 1 A/g compared to that of C-RGO. As for N/S-RGO, it shows the highest conductivity of 107 S/m, but its decline rate is faster than that of N-RGO, which possesses the conductivity of 76 S/m. In this work, we compared the electrochemical performance of different chemically reduced RGO at different storage times and tried to explain the principles of their performance changes over time. This work has focused on investigating the performance stability of RGO during a long preservation period of up to 90 days, complemented extensive relevant test data of various performance changes over time, and especially, filled in the remarkable data gaps in the less-reported conductivity test of different storage time.