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Electrochemical performance data determined with a three-electrode system using 6 mol/L potassium hydroxide solution as the electrolyte; (a) GCD curves for AHC-CL-TU, AHC-CL-AS, AHC-CL-TU-BA, and AHC-CL-AS-BA at a current density of 1 A/g; (b) CV curves for AHC-CL-TU, AHC-CL-AS, AHC-CL-TU-BA, and AHC-CL-AS-BA at a scan rate of 10 mV/s and (c) Nyquist spectra of AHC-CL-TU, AHC-CL-AS, AHC-CL-TU-BA, and AHC-CL-AS-BA.
