fig3

Figure 3. Electrochemical performance of three-electrode system. (A) CV curves of Ni_1-xCo_xP@NC electrode; (B) Corresponding log (i) vs log (v) plots at specific peaks; (C) Typical diffusion-controlled fraction at 10 mV s^-1 of the Ni_1-xCo_xP@NC electrode (inset is the capacitive and diffusion-controlled charge storage at different scan rates); (D) Bode modulus plots; (E) GCD curves of Ni_1-xCo_xP@NC electrode; (F) Specific capacitance of Ni_1-xCo_xP@NC, Ni₂P@NC and CoP@NC electrode at different current densities; (G) Comparison of the rate capability with reported NiCo-bimetallic phosphides electrodes; (H) Cycle performance of different electrodes. Ni_1-xCo_xP@NC: N-doped carbon (NC)-coated Ni_1-xCo_xP; CV: cyclic voltammetry; GCD: galvanostatic charge/discharge.