Multidimensional Analysis of Moisture-Induced Power Generator Using Quartz Crystal Microbalance

A novel quartz crystal microresonator was developed as a moisture-induced power generator (MPG) through constructing an interdigitated electrodes-lateral field excited (IDEs-LFE) quartz resonator. This system enabled the simultaneous measurement of both the electrical output of the MPG and the resonant frequency shift of the quartz crystal (QC) in real time. The SCP film, composed of sodium alginate, carbon nanoparticles and polyvinyl alcohol was coated onto the IDEs which were deposited on the top surface of the QC. Following the coating process, a voltage of 1 V was applied across the IDEs to construct ion concentration gradient, resulting in the generation of electricity during the adsorption of water molecules. Two symmetrical electrodes which were deposited on the bottom surface of the QC were employed to monitor the adsorption of water molecules into the SCP film by measuring the change in resonant frequency during oscillation. By conducting simultaneous measurements of the resonant frequency shift and electrical output under varying humidity conditions, parametric plots were established that correlate the electrical output with the resonant frequency shift. This dynamic interplay between resonant frequency shifts and electrical output provided insights into the impact of moisture adsorption on MPG performance.