With the rapid development of flexible electronic devices including wearable displays and intelligent bracelets, [1][2][3] flexible energy storage devices including supercapacitors [4][5][6] and batteries, [7,8] have attracted intensive interest. Compared with traditional energy storage devices that are bulky and rigid, flexible supercapacitors and batteries usually maintain outstanding electrochemical properties under diverse deformations such as bending, twisting, and stretching. For practical applications, flexible energy storage devices usually require a rational design to be integrated with more functions, e.g., sensing, energy harvesting, or energy transit system. [9][10][11][12] A self-powered integrated device was fabricated by connecting an asymmetric microsupercapacitor to a TiO 2 photodetector, [5] or a self-powered smart cloth was designed by weaving a fiber-based generator into a wireless temperature sensor. [13] However, the integrated devices in series face the challenges of extra weight and element size. [14] Strain sensors, widely applied for human motion detection [15][16][17] and health monitoring systems, [18][19][20] can be operated by recording the change of electrical characteristics, such as the resistance change caused by mechanical deformations. [21] Traditional strain sensors based on metals and semiconductors, however, can detect only a very narrow range of strain (ε < 5%) due to their rigid nature. [22,23] Strain sensors with high performances (e.g., high stretchability, high sensitivity, and broad sensing range) can be obtained by employing nanomaterials as conducting components to design the strain-sensing materials. [24][25][26] Among them, carbon nanotubes (CNTs)-based strain sensors have been extensively studied due to their excellent electrical and mechanical properties. They can be assembled in wrinkled structure by prestretching method to realize a highly stretchable strain sensor. [27][28][29] Another efficient strategy to achieve the goal is to introduce the nano-/microstructures (including pyramid arrays, [30] microdome arrays, [31] microgrooves, [32] etc.) on flexible polymeric substrates via rational nanotechnologies. To date, most of these microstructures were fabricated through traditional lithography technique involving a complicated, time-consuming, and high-cost process. [33] To Flexible devices integrated with sensing and energy storage functions are highly desirable due to their potential application in wearable electronics and human motion detection. Here, a flexible film is designed in a facile and low-cost leaf templating process, comprising wrinkled carbon nanotubes (CNTs) as the conductive layer and patterned polydimethylsiloxane (PDMS) with bio-inspired microstructure as a soft substrate. Assembled from wrinkled CNTs on patterned PDMS film, a strain sensor is realized to possess sensitive resistance response against various deformations, producing a resistance response of 0.34%, 0.14%, and 9.1% under bending, pressing, and 20% strain, respectively. Besides, t...
Novel F-CuO and FeOOH hollow octahedra are developed through a facile structure-evolution reaction. The formation of interior voids within the hierarchical octahedra is motivated by the Cl ions based etching, under a precise control over reaction agents and conditions. Owing to the synergistic effect of unique structural features and favorable composition, the hollow octahedra exhibit superior lithium-storage properties.
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