Figure 4.
Cycling voltammetry of GeO2-rGO-80 (a), Ge3N4-rGO-80 (b), and GeP-rGO-80 (c) at 0.1 mV s−1. First and second charge−discharge curves for GeO2-rGO-80 (d), Ge3N4-rGO-80 (e), and GeP-rGO-80 (f) at 100 mA g−1.
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