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Cyclic voltammetry (CV) curves of the (a) Ge/GeO2 NPs and (b) Ge/GeO2/MRGO at a scan rate of 0.1 mV/s. (c) CV curves of Ge/GeO2/MRGO recorded at various scan rates. Comparison of pseudocapacitive and diffusion-controlled charge storage processes at scan rate 0.8 mV/s for (d) Ge/GeO2 NPs and (e) Ge/GeO2/MRGO. (f) Contribution ratio of pseudocapacitive and diffusion-controlled charge storage at various scan rates.
