This work has demonstrated that applying voltage can significantly increase the efficiency of the etching of MAX phases to produce MXene sheets with a large lateral size. The applied voltage allows the aluminium in the MAX phases precursor to undergo anodic dissolution. This extra reaction pathway significantly reduces the etching time and the etching temperature required for etching in HBF4, and reduces the release of HF during the etching. The influence of temperature in both chemical and electrochemical accelerated the etching but also may lead to over-etching and nanosheet damage. Compared to the conventional chemical approaches which use HF-based etchants, the electrochemical etching with HBF4 is milder, faster, and safer to handle, with a high yield of 85 %. Furthermore, unlike conventional HF approaches, in which temperature and concentration of etchant are the only variables to control the reaction kinetics, the voltage can provide the further driving force to the reaction. This process may eventually be used to fabricate MXenes that cannot be etched by using HF. The simple experimental setup and mild reaction conditions of the electrochemical etching allow scale up for large-volume manufacturing. As the result of reduced etching time and HF exposure, the EE-MXene exhibits a bigger aspect ratio and less halide termination compared to HF-etched MXene. For energy storage applications, EE-MXene demonstrated the pseudocapacitive nature of energy storage in lithium-ion supercapacitors and exhibited superior cyclability and rate performance.