We successfully fabricate flexible electrochromic supercapacitor (SC) electrodes employing novel flexible transparent conducting substrates. The as-synthesized flexible electrochromic SC electrodes exhibit great electrochemical performances (13.6 mF cm(-2), 138.2 F g(-1)) and high coloration efficiency (80.2 cm(2) C(-1)), which demonstrate their potential applications in flexible smart windows combining energy storage and electrochromism.

WO3 nanoflower based negative electrodes demonstrate excellent balance between areal and gravimetric specific capacitances.

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Exploiting electrocatalysis for wearable enzyme-free biosensors and biofuel cells has recently greatly developed in preliminary medical diagnosis and human healthcare fields. Herein, several facet-controlled cuprous oxide (Cu2O) nanostructures have been systematically fabricated to investigate the facet-dependent electrocatalysis mechanism. As a result, cuboctahedral Cu2O with a hollow structure exhibits optimal sensing performance for glucose detection compared with octahedral or extended hexapod Cu2O. The facet-dependent sensing process reveals that Cu2O­{100} and Cu2O­{111} facets are helpful in acquiring a higher interaction with enzyme-free substrates and accelerating electron transfer, respectively, to improve electrocatalytic activity. As a proof of concept, combined with a portable wireless device, wearable Cu2O enzyme-free biofuel cell systems can achieve glucose sensing by both open circuit potential and power output signals, which would potentially be used for a wearable enzyme-free energy platform. Therefore, this wearable enzyme-free smart sensing concept would help in the targeted establishment of biomarker electrocatalysts, and further offers considerable promise for the development of biofuel cells in the wearable healthcare monitoring field.

Wearable energy storage and flexible body biomolecule detection are two key factors for real-time monitoring of human health in a practical environment. It would be rather exciting if one wearable system could be used for carrying out both energy storage and biomolecule detection. Herein, carbon fiber-based NiCoO2 nanosheets coated with nitrogen-doped carbon (CF@NiCoO2@N–C) have been prepared via a simple electrochemical deposition method. Interestingly, being a dual-functional active material, CF@NiCoO2@N–C exhibits excellent behaviors as a supercapacitor and prominent electrocatalytic properties, which can be applied for enzyme-free biosensor. It exhibits outstanding energy storage, high capacitive stability (94% capacitive retention after 10,000 cycles), and pre-eminent flexible ability (95% capacitive retention after 10,000 bending cycles), as well as high sensitivity for enzyme-free glucose detection (592  μA mM–1). Moreover, the CF@NiCoO2@N–C-based wearable supercapacitors would be used as self-powered energy systems for enzyme-free biosensors. Integrating with bluetooth, we have successfully developed a wearable self-powered enzyme-free smartsensor, remotely controlled using a smartphone for health monitoring in a practical environment. From this prospective study, it was found that the design of wearable self-powered smartsensors, demonstrating energy storage and enzyme-free biosensing in one system, provides a promising device for detecting body biomolecules, which has the potential to be implemented in the artificial intelligent fields.

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Self‐healable and flexible all‐in‐one self‐powering smartsensing devices have recently attracted great attention. Herein, a flexible all‐in‐one solid‐state electronic system of polyvinyl alcohol (PVA) hydrogel‐based supercapacitors for self‐powering ammonia smartsensors has been fabricated. Self‐healing supercapacitors are prepared by integrating polypyrrole (PPy) and boron cross‐linked PVA/KCl hydrogel as a sandwich configuration, exhibiting large specific capacitance of 244.81 mF cm−2 at 0.47 mA cm−2, and good charging/discharging stability of 2000 cycles, while ammonia sensors are realized by a SnO2/PPy‐modified conductive PVA hydrogel film, demonstrating an excellent sensing behavior toward NH3 vapor under 50 ppb–500 ppm. As a result, self‐healing supercapacitors could well store energy and then self‐power sensing unit for remotely real‐time detection via a smartphone, acquiring high flexibility of energy‐sensing system. With attractive biocompatibility and self‐healing performance toward various environment, this all‐in‐one flexible energy‐smartsensor system would pave the way to novel fabrication process in realization of wearable self‐healing smart devices.

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