As the water-soluble derivative of graphene,graphene oxide (GO), with many functional groups on thesurface, is one of the best candidates for fabricating artificialnacre, because functional surface groups allow for chemicalcross-linking to improve the interfacial strength of theadjacent GO layers. Until now, several methods have beendeveloped to functionalize individual GO sheets and enhancethe resultant mechanical properties, including divalent ion(Mg

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Ultratough artificial nacre based on conjugated cross-linked graphene oxide

Microstructure evolution and texture tailoring of reduced graphene oxide reinforced Zn scaffold.

Conductive Hydrogel-Based Electrodes and Electrolytes for Stretchable and Self-Healable Supercapacitors

Conductive hydrogels are attracting increasing attention for applications in wearable and flexible strain sensors, due to their excellent conductivity and mechanical properties. However, conventional conductive hydrogels lack anti-freezing and moisturizing properties and thus cannot be used as sensors under relatively harsh conditions, due to the use of pure water as the dispersion medium. In addition, conventional hydrogels cannot generate electric power, which is an essential requirement for practical applications in hydrogel-based strain sensors. Herein, a conductive hydrogel was fabricated by incorporating tannic acid–carbon nanotubes (TA–CNTs) into a polyvinyl alcohol (PVA) matrix containing a water–glycerol dispersion medium. The TA–CNT–glycerol–PVA (TCGP) hydrogel possessed excellent anti-freezing properties (−30 °C), long-term moisturizing performance (10 days), and outstanding sensitivity. Moreover, the TCGP hydrogel could be used not only as a strain sensor for the detection of various human motions, but also as an electrode for detecting human electrophysiological signals even in a relatively harsh environment. More importantly, a TCGP hydrogel-based moist-electric generator could generate electric power from moisture flow. These outstanding advantages highlight the great potential of the TCGP hydrogel in wearable flexible strain sensors, bioelectrodes, and next-generation green energy-generating devices.

Anti-freezing and moisturizing conductive hydrogels for strain sensing and moist-electric generation applications

MoS2, the second most widely studied two-dimensional nanomaterial, has fascinating physical and chemical properties and thus has a wide variety of applications. MoS2 has been getting much attention...

Recent advances in 2D-MoS2 and its composite nanostructures for supercapacitor electrode application

Fabrication of flexible free-standing reduced graphene oxide/polyaniline nanocomposite film for all-solid-state flexible supercapacitor

A highly stretchable, self-healing, recyclable and interfacial adhesion gel: Preparation, characterization and applications

A new kind of polysiloxane-supported ionogel is successfully designed via locking ionic liquids (ILs), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][Tf2 N]), into poly(aminopropyl-methylsiloxane) (PAPMS) grafted with [2-(methacryloyloxy)ethyl] trimethylammonium chloride (METAC) in the presence of tannic acid (TA). The novel ionogel exhibits good mechanical and recovery properties, as well as high ionic conductivity (1.19 mS cm-1 ) at 25 °C. In addition, the totally physical dual-crosslinked network based on ionic aggregates among METAC and the hydrogen bonds between PAPMS and TA provides excellent self-healing ability, which allows the damaged ionogel to almost completely heal (≈83%) in 12 h at room temperature. Interestingly, the obtained ionogel also shows satisfactory adhesive behavior to various solid materials. Moreover, this novel ionogel can maintain its high ionic conductivity and recovery property even at subzero temperatures. Therefore, this polysiloxane-supported ionogel is anticipated to be advantageous in flexible electronic devices such as sensors and supercapacitors, even at low temperatures.

A Highly Ionic Conductive, Healable, and Adhesive Polysiloxane-Supported Ionogel.

There are many studies about integrating supercapacitors to meet actual application needs, but challenges remain in assembling the device without a current collector and other additions. In this investigation, an all-in-one supercapacitor that integrates the electrodes, solid-electrolyte and current collectors was developed using a facile strategy. The method requires only some cheap and easily available experimental products including poly(vinyl alcohol) and polyaniline, and does not use advanced equipment. The all-in-one supercapacitor has good properties including being freestanding, self-healable and high stretchable. Specially, the tensile strength of supercapacitor electrode is close to 6 MPa and the elongation at break as high as around 700%. This work offers a versatile strategy to produce all-in-one energy-storage devices which are multifunctional and have potential applications for the future such as in wearable electronics.

Ruofei Hu

Papers

Fabrication of flexible free-standing reduced graphene oxide/polyaniline nanocomposite film for all-solid-state flexible supercapacitor

A highly stretchable, self-healing, recyclable and interfacial adhesion gel: Preparation, characterization and applications

A Highly Ionic Conductive, Healable, and Adhesive Polysiloxane-Supported Ionogel.

An all-in-one supercapacitor with high stretchability via a facile strategy

Fabrication of stretchable multi-element composite for flexible solid-state electrochemical capacitor application