Herein, we report a low HF synthesis of Ti3C2 and Ti3CN MXenes via electrochemical etching, using HBF4 as the electrolyte. The proposed mechanism allows the Ti3AlC2 and Ti3AlCN precursor to undergo selective anodic dissolution of aluminum with the tetrafluoroborate ion. With the addition of the etching pathway provided by the presence of electrical potential, the etching of MXene is quicker and occurs at a lower temperature, minimizing the release of HF. The effect of electrical potential in accelerating the etching was studied. Furthermore, the influence of temperature for both electrochemical and chemical etching with HBF4 was studied. As a result of the suppression of HF decomposition and etching time, the electrochemically etched MXene exhibits a larger lateral size compared to MXene produced by chemically etching in HF or HBF4. The energy storage performance of the electrochemically etched Ti3C2 and Ti3CN in lithium-ion batteries is tested and mimics the superior cyclic performance and rate capabilities of chemically etched MXene. The electrochemical etched Ti3C2 and Ti3CN anodes exhibit superior cyclic performance and rate reversibility for lithium-ion supercapcitor. For clarification, the electrochemically etched Ti3C2 and Ti3CN will be labelled EE-Ti3C2, EE-Ti3CN, or EE-MXene, respectively. MXenes that are chemically etched by HBF4 will be labelled CE-MXene. MXene etched by HF and HCl will be labelled HF/HCl-MXene.