Figure 9.
(a) Stability of the CQDs/CPE by comparison of Ip at different times: (a) 1, (b) 4, (c) 8, (d) 12, and (e) 16 days. (b) Reusability of the CQDs/CPE by comparison of Ip at different cycles (a) 1, (b) 5, (c) 10, (d) 15, and (e) 20 cycles.
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