The specific capacitance value calculated from the GCD curve was found to be 502.97 Fg −1 for Nb 2 CT x at the current density of 1.0 Ag −1 , and it exhibited a decreasing trend up to 165 Fg −1 at the current density of 4.4 Ag −1 , as shown in Figure 6 d,e.
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Safe Etching Route of Nb<sub>2</sub>SnC for the Synthesis of Two-Dimensional Nb<sub>2</sub>CT<sub>x</sub> MXene: An Electrode Material with Improved Electrochemical Performance.
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