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Hydrogen energy is an alternative to carbon‐based fuels due to its zero pollution and high energy density. The electrolysis of water, driven by triboelectric nanogenerators (TENGs), is considered as a promising green method for hydrogen production. 2D transition metal carbides/nitrides can be used as catalyst carriers, through interface engineering to prepare molybdenum disulfide/titanium dioxide (MoS2/Ti3C2) composites for accelerating the kinetics of hydrogen evolution reaction (HER). In this work, a multilayered rotating TENG (MR‐TENG) is designed to convert rotating mechanical energy into electrical energy for constructing a self‐powered hydrogen production system. MoS2/Ti3C2 composites are utilized as electrodes for electrolyzing water, which can enhance the catalytic activity in the HER. The output performance of the MR‐TENG and its managed charging performance when integrating with a constant voltage power management module are investigated. Besides the application demonstrations of powering a digital thermometer, an anemometer, and a commercial incandescent lamp, the power‐managed MR‐TENG is applied to generate electricity for water electrolysis, and realize a hydrogen evolution rate of 7.1 mL min−1 at the rotation speed of 90 rpm. This work provides an effective approach to the self‐powered production of high‐purity green hydrogen based on renewable blue energy utilization with important industrial application prospects. [ABSTRACT FROM AUTHOR]

Decahedral Cu2WS4 nanocrystal grains with a three-layer body-centered tetragonal crystal phase were successfully prepared by a simple hydrothermal method. Then, the interspersed reticulate Cu2WS4 nanocrystal–poly-(vinylidene difluoride) (PVDF)/Ni composites were prepared by filling the mixed sol of organic ferroelectric polyvinylidene difluoride (PVDF) and Cu2WS4 nanocrystal grains into the void of Ni foam. Subsequently, polytetrafluoroethylene (PTFE)/Cu was used as a negative triboelectric layer, the prepared interspersed reticulate Cu2WS4 nanocrystal–PVDF/Ni composites were used as the positive triboelectric layer, and then the interspersed reticulate triboelectric nanogenerators (TENGs) were assembled. The use of the interspersed reticulate Ni electrode in the TENGs effectively reduces the effective thickness of the triboelectric layer, and the incorporation of Cu2WS4 nanocrystal grains into ferroelectric PVDF increases the dielectric constant of the triboelectric layer by enhancing the space charge polarization. Obviously, a reduction of the effective thickness and an increase of the dielectric constant further enhance the output VOC by nearly 20 times and the JSC of the Cu2WS4 nanocrystal–PVDF/Ni TENG by nearly 10 times, and TENG has good output stability. Lastly, the TENG was successfully used as the power supply to perform the electrocatalytic degradation of RhB, which exhibits high efficiency and excellent duration stability. The works provide good ideas and methods for the treatment of marine pollutants. [ABSTRACT FROM AUTHOR]

LaxFe0.1–x codoped ZnO nanorod arrays have been successfully prepared by the simple hydrothermal method, and the concentration ratio of 1:1 of Fe and La endows the codoped ZnO arrays with optimal ferroelectric properties. Then the ferroelectric La0.05Fe0.05 codoped ZnO nonoarrays and polydimethylsiloxane (PDMS) are used as positive and negative friction materials, respectively, to assemble the triboelectric nanogenerators (TENGs). Compared with Fe- or La-doped ZnO positive friction materials, the La0.05Fe0.05 codoped ZnO positive friction layer increases the output current density of TENGs by nearly 10 times, and the TENGs have excellent output stability. Lastly, the La0.05Fe0.05 codoped ZnO/PDMS TENGs have been successfully used for the high-efficient electrocatalytic degradation of RhB in simulated seawater. The work is very beneficial to the development of self-powered electrochemical degradation of organic pollutants in wastewater. [ABSTRACT FROM AUTHOR]