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(a) Discharge curves for the 1st, 1000th, and 2000th cycles, (b) GCD curves for the 1st, 2nd, 3rd, 4th, 5th, 1996th, 1997th, 1998th, 1999th, and 2000th cycles, (c) Cycling stability of the symmetric device, (d) Nyquist plots recorded for the fresh device after 1000 and 2000 cycles.
