I. Introduction
One of the most important aspects of today’s society relates to the preservation of the environment. Consequently, there has been an escalating interest to develop electronic devices with reduced ecological footprints, commonly referred to as “eco-friendly” devices [1]. A common facet of environmentally sustainable systems is the manner in which they obtain their energy. Conventional approaches entail using solar or wind generators [2]. However, for small systems characterized by low power demands, such as wearable technology or sensor nodes, alternative strategies have emerged to harvest energy from the environment, also known as scavenging [3]. A vital capacity is self-sufficiency, denoting a system’s ability to operate independently by integrating energy harvesting, energy storage, power regulation, and control electronics.