Recently developed triboelectric nanogenerators (TENGs) act as a promising power source for self-powered electronic devices. However, the majority of TENGs are fabricated using metallic electrodes and cannot achieve high stretchability and transparency, simultaneously. Here, slime-based ionic conductors are used as transparent current-collecting layers of TENG, thus significantly enhancing their energy generation, stretchability, transparency, and instilling self-healing characteristics. This is the first demonstration of using an ionic conductor as the current collector in a mechanical energy harvester. The resulting ionic-skin TENG (IS-TENG) has a transparency of 92% transmittance, and its energy-harvesting performance is 12 times higher than that of the silver-based electronic current collectors. In addition, they are capable of enduring a uniaxial strain up to 700%, giving the highest performance compared to all other transparent and stretchable mechanical-energy harvesters. Additionally, this is the first demonstration of an autonomously self-healing TENG that can recover its performance even after 300 times of complete bifurcation. The IS-TENG represents the first prototype of a highly deformable and transparent power source that is able to autonomously self-heal quickly and repeatedly at room temperature, and thus can be used as a power supply for digital watches, touch sensors, artificial intelligence, and biointegrated electronics.
Metal‐organic frameworks (MOFs) have received increasing attention as promising electrode materials in supercapacitors. Yet poor conductivity in most MOFs largely inhibits their capacitance and/or rate performance. An effective strategy is developed to reduce the bulk electrical resistance of MOFs by exchanging organic ligands with PO43− groups that adopt the external morphology of the MOFs.
The next generation of sensors should be self-powered, maintenance-free, precise, and have wide-ranging sensing abilities. Despite extensive research and development in the field of pressure sensors, the sensitivity of most pressure sensors declines significantly at higher pressures, such that they are not able to detect a wide range of pressures with a uniformly high sensitivity. In this work, we demonstrate a single-electrode triboelectric pressure sensor, which can detect a wide range of pressures from 0.05 kPa to 600 kPa with a high degree of sensitivity across the entire range by utilizing the synergistic effects of the piezoelectric polarization and triboelectric surface charges of self-polarized polyvinyldifluoride-trifluoroethylene P(VDF-TrFE) sponge. Taking into account both this wide pressure range and the sensitivity, this device exhibits the best performance relative to that of previously reported self-powered pressure sensors. This achievement facilitates wide-range pressure detection for a broad spectrum of applications, ranging from simple human touch, sensor networks, smart robotics, and sports applications, thus paving the way forward for the realization of next-generation sensing devices. Moreover, this work addresses the critical issue of saturation pressure in triboelectric nanogenerators and provides insights into the role of the surface charge on a piezoelectric polymer when used in a triboelectric nanogenerator.
NanoResearch DOI () Research Article a high sensitivity of 0.104 VkPa -1 (range = 0.05 -5 kPa), 0.055 VkPa -1 (range = 5 -60 kPa) and 0.049 VkPa -1 (range = 60 -600 kPa). Most importantly, this work addresses the critical issue of saturation pressure (pressure at which the output voltage saturates in a triboelectric nanogenerator) and provides insights into the fundamental understanding of the role of surface charges in a piezoelectric polymer, when used as a triboelectric nanogenerator.
Co-processing
of two greenhouse gases, methane and carbon dioxide, was carried out
in a dielectric barrier plasma reactor. The influence of feed gas
proportion on the performance of the plasma reactor was investigated,
especially with an objective to increase the conversion of the reactants
and selectivity to syngas. To understand the influence of the catalyst
on dry reforming, 10–30% NiO/Al2O3 catalysts
were prepared by a single-step combustion synthesis and various physicochemical
techniques confirmed the formation of nanosized Ni particles. A total
of 10% of the discharge volume was packed with Ni/Al2O3 catalysts in a packed-bed configuration. An interesting observation
is the increased syngas selectivity on the addition of catalyst to
plasma, and among the catalysts tested, 20% Ni showed a H2/CO ratio of 2.25 against 1.2 with a plasma reactor alone.
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