Piezoionic Elastomers by Phase and Interface Engineering for High‐Performance Energy‐Harvesting Ionotronics

Author:

Zhu Weiyan1,Wu Baohu2,Lei Zhouyue1,Wu Peiyi1ORCID

Affiliation:

1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Chemistry and Chemical Engineering Center for Advanced Low‐Dimension Materials Donghua University Shanghai 201620 China

2. Jülich Centre for Neutron Science (JCNS) at Heinz Maier‐Leibnitz Zentrum (MLZ) Forschungszentrum Jülich Lichtenbergstr. 1 85748 Garching Germany

Abstract

AbstractPiezoionic materials play a pivotal role in energy‐harvesting ionotronics. However, a persistent challenge lies in balancing the structural requirements for voltage generation, current conduction, and mechanical adaptability. The conventional approach of employing crystalline heterostructures for stress concentration and localized charge separation, while effective for voltage generation, often compromises the stretchability and long‐range charge transport found in homogeneous quasisolid states. Herein, phase and interface engineering strategy is introduced to address this dilemma and a piezoionic elastomer is presented that seamlessly integrates ionic liquids and ionic plastic crystals, forming a finely tuned microphase‐separated structure with an intermediate phase. This approach promotes charge separation via stress concentration among hard phases while leveraging the high ionic charge mobility in soft and intermediate phases. Impressively, the elastomer achieves an extraordinary piezoionic coefficient of about 6.0 mV kPa−1, a more than threefold improvement over current hydrogels and ionogels. The resulting power density of 1.3 µW cm−3 sets a new benchmark, exceeding that of state‐of‐the‐art piezoionic gels. Notably, this elastomer combines outstanding stretchability, remarkable toughness, and rapid self‐healing capability, underscoring its potential for real‐world applications. This work may represent a stride toward mechanically robust energy harvesting systems and provide insights into ionotronic systems for human–machine interaction.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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