Energy harvesting from the ambient environment can be a beneficial and promising source for powering micro- and nanodevices. Triboelectric nanogenerator (TENG) technology has been proved to be a simple and cost-effective method to harness ambient mechanical energy. The performance of the TENG device mainly depends on the careful selection of the material pair. So far, metals and polymer materials have dominated TENG technology. Recently, there have been few reports on metal–organic framework (MoF)-based TENGs. MoFs are very interesting and offer excellent chemical and thermal stability, besides their unique properties, such as tunable pore size and high surface area. Herein, we report a zeolitic imidazole framework (ZIF-67)-based TENG device for self-powered device applications. We used ZIF-67 as one tribolayer, and PET and PMMA as opposite tribolayers. The output performance of the TENG device fabricated with the PMMA/ZIF-67 pair showed values of 300 V, 47.5 µA, and 593 mW/m2 of open-circuit voltage, short-circuit current, and power density, respectively. To the best of our knowledge, these are the highest reported values so far for ZIF-67-based TENG devices. The fabricated TENG device lit up 250 LEDs and was employed to explore different self-powered device applications.

Low output power, intricate device designs, limitation on scalability, limited production capability, and higher fabrication cost are the major hurdles to use triboelectric nanogenerators (TENGs) as a power source in self-powered device applications. This work reports a highperformance, simple design, and inexpensive TENG using overhead projector (OHP) sheets and ZnO nanosheet array films. The fabricated TENG produced a maximum output voltage, current, and power density of ∼292 V, ∼55 μA, and ∼424.8 mW/m 2 for each hand slapping force, respectively. The charged nature of one side of the OHP sheet is responsible for obtaining the high-power density reported in this communication. Further, the TENG has shown excellent stability over a period of 6 months and more than 10,000 test cycles. The stability of ZnO nanosheets is excellent even the after 10,000 test cycles. The TENG's AC output is utilized to control the optical characteristics of the cholesteric liquid crystal (CLC) devices. CLC devices are demonstrated for mobile security, optical switch, webcam security, and self-powered smart windows or e-paper displays. Further, we have demonstrated self-powered electroluminescence and portable electronic devices. The current work has potential applications in portable, wearable, and self-powered electronic devices due to its high power density, simple design, minimal cost, and scalability.

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The rise of plastic waste on the earth and its associated environmental pollution is a major concern for humankind. The reuse of plastic waste for energy harvesting not only reduces...

The exhaust from vehicles pollutes the environment and contributes to global warming, acid rain, SMOG, respiratory and other health problems. In this work, Dimethyl Carbonate (DMC) is mixed as an additive to the diesel as pilot fuel, with focus on reduction of harmful exhaust emissions and maintaining high Brake Thermal Efficiency. The performance and emission characteristics of the diesel engine operated with diesel fuel mixed with DMC (5%) was studied. These results were compared with the neat diesel as base fuel. The experimental study found that diesel engines fueled with DMC had improved the combustion and emission performances without significant increase in NOx emissions. By using biodiesel, there are some disadvantages such as higher density, lesser heating value, high fuel consumption and high oxides of nitrogen. To avoid above disadvantages, the fuel additives help in playing a very important role in minimizing the drawbacks of biodiesel and in maintaining international fuel standards. Additives can be considered toward to improve combustion, fuel economy and to decrease the emissions. In particular, DMC may be a promising additive for diesel fuel owing to its high oxygen content, no carbon-carbon atomic bonds, suitable boiling points and solubility in diesel fuel.