Fangya Qi,Yulu Tang,Chen Zhao,Zhaoqiang Zheng,Xiaoteng Jia,Yonggang Min
Two-dimensional transition-metal carbide (MXene) Ti3C2Tx possesses advantages of high conductivity and high volumetric capacitance, making it an ideal electrode material for high-performance supercapacitors. However, the high stiffness impedes its direct implementation in stretchable supercapacitors for integrated wearable electronics. Here, we demonstrate a stretchable supercapacitor based on Ti3C2Tx electrodes through a device-scaled controlled crumpling strategy. An ultrathin supercapacitor with a thickness of about 45 μm is assembled with gold foil gilded ultrathin preservative membrane as a current collector, drop cast Ti3C2Tx as an active material, and poly(vinyl alcohol)-H3PO4 as a polymer gel electrolyte. The ultrathin supercapacitor with optimized electrodes exhibits an areal specific capacitance of 10.2 mF cm–2 at 5 mV s–1 with excellent mechanical flexibility. The controlled adhesion of the ultrathin supercapacitor on a prestretched latex substrate and the elastic deformation of the substrate induce local displacements on the ultrathin supercapacitor to create periodic crumples. Stretching the crumpled supercapacitor only causes the amplitude and wavelength changes of the crumples, leading to a high level of stretchability (up to 100%). Also, the crumpled supercapacitor can sustain 1000 stretching cycles at a maximum strain of 100%. Moreover, it can provide sufficient power to drive α-In2Se3 nanoflake-based photodetector at 100% strain. This device-scaled controlled crumpling method provides a facile and effective way to design stretchable energy devices with high stretching durability for stretchable devices.
Considering the vital physiological functions of dopamine (DA) and uric acid (UA) and their coexistence in the biological matrix, the development of biosensing techniques for their simultaneous and sensitive detection is highly desirable for diagnostic and analytical applications. Therefore, Ti3C2Tx/rGO heterostructure with a double-deck layer was fabricated through electrochemical reduction. The rGO was modified on a porous Ti3C2Txelectrode as the biosensor for the detection of DA and UA simultaneously. Debye length was regulated by the alteration of rGO mass on the surface of the Ti3C2Txelectrode. Debye length decreased with respect to the rGO electrode modified with further rGO mass, indicating that fewer DA molecules were capable of surpassing the equilibrium double layer and reaching the surface of rGO to achieve the voltammetric response of DA. Thus, the proposed Ti3C2Tx/rGO sensor presented an excellent performance in detecting DA and UA with a wide linear range of 0.1–100 μM and 1–1000 μM and a low detection limit of 9.5 nM and 0.3 μM, respectively. Additionally, the proposed Ti3C2Tx/rGO electrode displayed good repeatability, selectivity, and proved to be available for real sample analysis.
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