This study investigates the piezoionic effects in chemo-mechanical energy harvesting using carbon nanotube (CNT) yarn twists. The research explores how mechanical energy is converted into electrical energy through the twisting of CNT yarns, which alters the electrochemical capacitance and generates electricity in various aqueous environments. The study combines experimental and computational methods, including in situ Raman scattering, piezoelectrochemical impedance spectroscopy (PIS), and molecular dynamics (MD) simulations, to understand the underlying mechanisms of the piezoionic effect. The findings reveal that the mechanical deformation of CNT yarns leads to the release of ions, particularly anions, which affects the electrical double layer (EDL) and influences the electrical output. The study shows that the performance of the energy harvester depends on the type of electrolyte used, with different cations (Li+, Na+, K+) exhibiting varying effects on the harvested energy. The results indicate that the piezoionic mechanism is primarily capacitive, with significant contributions from ion movement and ionic conductivity. The study also highlights the importance of ionic conductivity and the rigidity of ionic clusters in determining the efficiency of energy harvesting. The results demonstrate that higher ionic conductivity leads to better performance, especially at higher frequencies. Additionally, the study provides insights into the structural properties of hydrated ion clusters and their interactions with the CNT surfaces, revealing the role of ligand bond strength and interligand repulsion in the energy harvesting process. The research concludes that the piezoionic energy harvesting mechanism involves the deformation of CNT bundles, leading to changes in the EDL and ion kinetics. The study emphasizes the need to optimize ion mobility, conductivity, and solvated ion cluster structure to enhance the performance of chemo-mechanical energy harvesters. The findings contribute to the development of high-performance energy harvesting systems for various applications, including wearable electronics, biomedical devices, and sustainable energy solutions.This study investigates the piezoionic effects in chemo-mechanical energy harvesting using carbon nanotube (CNT) yarn twists. The research explores how mechanical energy is converted into electrical energy through the twisting of CNT yarns, which alters the electrochemical capacitance and generates electricity in various aqueous environments. The study combines experimental and computational methods, including in situ Raman scattering, piezoelectrochemical impedance spectroscopy (PIS), and molecular dynamics (MD) simulations, to understand the underlying mechanisms of the piezoionic effect. The findings reveal that the mechanical deformation of CNT yarns leads to the release of ions, particularly anions, which affects the electrical double layer (EDL) and influences the electrical output. The study shows that the performance of the energy harvester depends on the type of electrolyte used, with different cations (Li+, Na+, K+) exhibiting varying effects on the harvested energy. The results indicate that the piezoionic mechanism is primarily capacitive, with significant contributions from ion movement and ionic conductivity. The study also highlights the importance of ionic conductivity and the rigidity of ionic clusters in determining the efficiency of energy harvesting. The results demonstrate that higher ionic conductivity leads to better performance, especially at higher frequencies. Additionally, the study provides insights into the structural properties of hydrated ion clusters and their interactions with the CNT surfaces, revealing the role of ligand bond strength and interligand repulsion in the energy harvesting process. The research concludes that the piezoionic energy harvesting mechanism involves the deformation of CNT bundles, leading to changes in the EDL and ion kinetics. The study emphasizes the need to optimize ion mobility, conductivity, and solvated ion cluster structure to enhance the performance of chemo-mechanical energy harvesters. The findings contribute to the development of high-performance energy harvesting systems for various applications, including wearable electronics, biomedical devices, and sustainable energy solutions.