“…With the advent of Industry 4.0, [1][2][3] which is dominated by new technologies such as the Internet of Things, 4 big data, 5 robots, 6 and articial intelligence, 7 the demand for electrical energy exceeds the development of traditional coal power, 8,9 hydropower, 10,11 nuclear power, 12,13 wind power 14,15 and other largescale power generation equipment based on Faraday's law of electromagnetic induction, and the equipment for harvesting electrical energy is trending into miniaturization, light weight, diversication, and integration. [16][17][18][19][20] Integrating power supply units into electronic devices to maximize operating hours without charging or connecting wires has been a constant pursuit.…”