By utilizing a water-flow-driven triboelectric nanogenerator, a fully self-powered water-splitting process is demonstrated using the electricity converted from a water flow without additional energy costs. Considering the extremely low costs, the demonstrated approach is universally applicable and practically usable for future water electrolysis, which may initiate a research direction in the field of triboelectrolysis and possibly impacts energy science in general.
A simple method for the preparation of a Ga/ZSM-5 catalyst for propane aromatization was established by formic acid impregnation and in-situ treatment. The catalyst prepared by this novel method showed remarkably superior activity of propane aromatization. Under the conditions: T = 540 °C, P = 100 kPa, WHSV = 6000 ml/(g·h) and with a N 2 /C 3 H 8 molar ratio of 2, the highest propane conversion and 10 selectivity of BTX (benzene, toluene and xylene) on H-Ga/SNSA catalyst achieved was 53.6% and 58.0% respectively, much higher than that of the catalyst prepared using traditional impregnation method (38.8% and 48.2%). The catalysts were characterized by nitrogen physical adsorption, ICP-AES, DRIFT, Py-FTIR, NH 3 -TPD, H 2 -TPR, XPS and 27 Al MAS NMR techniques. The characterization data indicated that this facile methodology enhanced the dispersion of Ga species and promoted the formation of highly 15 dispersed (GaO) + species, which could exchange acidic protons (Brønsted acid sites) of the zeolite framework contributing to the strong Lewis acidity. The super catalytic behavior was attributed to the synergistic effect between strong Lewis acid sites generated by the (GaO) + species and the Brønsted acid sites. 75
In recent years, research in lithium-ion batteries (LIBs) has been focused on improving their performance in various ways, such as density, capacity, and lifetime, but little attention has been paid to the energy consumption cost in the manufacturing process. Herein, we report an energy-efficient preparation method of anode materials for LIBs based on a self-powered electrospinning system without an external power source, which consists of a rotatory triboelectric nanogenerator (r-TENG), a power management circuit, and an electrospinning unit. By harvesting kinetic energy from a handle rotation, the r-TENG is able to fully power the electrospinning system to fabricate nanofibers for LIBs. The as-obtained Si@void@C nanofibers present outstanding cyclic performance with a discharge capacity of 1045.2 mA h g after 100 cycles and 88% capacity retention, along with an excellent high rate capacity of 400 mA h g at a current density of 5 A g, which are completely comparable with those made by commercial electrospinning equipment. Our study demonstrates an innovative and distinct approach toward an extremely low-cost preparation procedure of electrode materials, leading to a great breakthrough for the LIB production industry.
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