A computer-implemented system for delivering energy to tissue having a necrotic threshold may generally comprise an electrode array comprising a plurality of electrodes, a central electrode positioned intermediate the plurality of electrodes, and a controller configured to not only apply a first sequence of electrical pulses to the electrode array to induce thermal heating in the tissue and reduce the necrotic threshold of the tissue but also apply a second sequence of electrical pulses to the central electrode to induce cell necrosis in the tissue by irreversible electroporation. Electrical ablation devices and methods of using the same are also described herein.