In the early 21st century, research and development on sustainable energy harvesting (EH) technologies have started. Since then, many EH technologies have evolved, advanced and even been successfully developed into hardware prototypes for proof of concept like Helimote, AmbiMax, et al. Researchers from all around the world are devoting their precious time and efforts into finding a realistic and novel energy harvesting solutions for sustaining the operational lifetime of low‐power electronic devices like mobile gadgets, smart wireless sensor networks, etc
