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In this work, we have combined polypyrrole (PPy) doped with dodecylbenzene sulfonate (DBS−) and carbide‐derived carbon (CDC), forming PPyCDC (PPy/DBS‐CDC) composites. Scanning electron microscopy revealed for PPyCDC that most CDC particles are located on the surface of the films. This work's main goal is to investigate the ion‐selectivity of the novel PPyCDC composite by linear actuation studies, with primary actuation taking place at discharging. Four different aqueous electrolytes are applied with hydrophobic cations, such as TMA+ (tetramethylammonium ion) and EDMI+ (1‐ethyl‐2,3‐dimethyl imidazolium ion). They are hydrophilic with Li+ (lithium‐ion) and Na+ (sodium ion). It was possible to distinguish each cation from linear actuation studies, either cyclic voltammetry or square wave potential steps. In the case of pristine PPy/DBS, that ion differentiation could not separate. Chronopotentiometric measurements of both films (PPyCDC and PPy/DBS) were performed. It could control (read) the strain for PPyCDC films and the potential at constant current density. The electrical energy adapts to exchange cations, forming a sensor device with ion‐selectivity of the applied cations considering their hydrophilic and hydrophobic characteristics. The best specific capacitance (energy storage) is found for EDMI+ cations in PPyCDC films with 193 F g−1, enabling this composite in multifunctional applications. [ABSTRACT FROM AUTHOR]

The development of artificial muscles replicating natural muscles is envisaged for the construction of soft devices and robots working at low voltages. Here we present the parallel electrosynthesis, characterization, and isometric and isotonic study of Electro‐Chemo‐Mechanical‐Deformations from polypyrrole doped with dodecylbenzenesulfonate (DBS−) with addition of 10 wt.% polyethylene oxide (PEO) forming PPy‐PEO/DBS films and PPy/DBS films. They were submitted to potential cycling or consecutive potential steps (0.0025 Hz–0.1 Hz) using different potential ranges (0.8 to −0.4 V, 0.65 to −0.6 V and ±1.0 V) in a solution of bis(trifluoromethane) sulfonimide lithium in propylene carbonate (LiTFSI‐PC). The PPy‐PEO/DBS linear films showed anion‐driven actuation while PPy/DBS revealed mixed ion (cation and anion) actuation. The PPy‐PEO/DBS film samples present the higher strain range of 20% (stress over 1 MPa) with 2 times higher strain and stress variations than the PPy/DBS films. The potential range 0.8 to −0.4 V showed best results for PPy‐PEO/DBS in long‐term cycling stability up to 1000 cycles of 4.2% strain and 0.35 MPa stress, suitable for artificial muscle like applications. Material characterization considered before and after actuation cycles was made with scanning electron microscopy, energy‐dispersive X‐ray, and Raman spectroscopy. [ABSTRACT FROM AUTHOR]