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...
We report a unique strategy to obtain the bifunctional heterogeneous catalyst TBB-Bpy@Salen-Co (TBB=1,2,4,5-tetrakis(bromomethyl)benzene, Bpy=4,4'-bipyridine, Salen-Co=N,N'-bis({4-dimethylamino}salicylidene)ethylenediamino cobalt(III) acetate) by combining a cross-linked ionic polymer with a Co(III) -salen Schiff base. The catalyst showed extra high activity for CO2 fixation under mild, solvent-free reaction conditions with no requirement for a co-catalyst. The synthesized catalyst possessed distinctive spherical structural features, abundant halogen Br(-) anions with good leaving group ability, and accessible Lewis acidic Co metal centers. These unique features, together with the synergistic role of the Co and Br(-) functional sites, allowed TBB-Bpy@Salen-Co to exhibit enhanced catalytic conversion of CO2 into cyclic carbonates relative to the corresponding monofunctional analogues. This catalyst can be easily recovered and recycled five times without significant leaching of Co or loss of activity. Moreover, based on our experimental results and previous work, a synergistic cycloaddition reaction mechanism was proposed.
Tw o-dimensional (2D) carbon hybrids have promise in various areas such as energy storage and catalysis.S imple methods for controllable fabrication of 2D graphitic carbon hybrids in as calable manner remains challenging.N ow, am icrowave-assisted strategy for mass production of 2D carbon hybrids based on self-boosting catalytic carbonization of am etal-agarose framework is demonstrated. Hybrids including hollowF e 3 Cn anoparticles,N i/Co nanoparticles, and hollowF eO x nanoparticles uniformly embedded in 2D graphitic carbon nanosheets (GCNs) are obtained, demonstrating the generality of the approach.M etal-polymer coordination and microwave-enabled fast catalytic decomposition of precursors playvital roles in facilitating the formation of the nanosheet structure.The resulting FeO x -GCNs hybrid exhibits superior lithium-storage performance (1118 mAh g À1 at 500 mA g À1 and 818 mAh g À1 at 2000 mA g À1 after 1200 cycles).
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