Triboelectric nanogenerators (TENGs) as self-powered sensing devices have attracted extensive interest in the field of flexible wearable electronics. Endowing TENGs with excellent environmental adaptability and high sensitivity is considered to be one of the promising strategies to satisfy future intelligent electronic sensing devices. The interference of a humid environment and common bare electrode has been a great hindrance to the output performance of TENGs. In this paper, a core−shell superhydrophobic and flexible triboelectric nanogenerator (abbreviated as PP/AgH-TENG) was prepared based on a polydimethylsiloxane (PDMS) film surface modified with polytetrafluoroethylene (PTFE) particles as the triboelectric layer and AgNWs/PVA hydrogel as the electrode. The obtained PP/AgH-TENG (4 × 4 cm 2 area) can easily light about 360 commercial LED lights with a maximum power density of 3.07 W/m 2 by tapping. It is important that PP/AgH-TENG can overcome the effect of water molecules on charge transfer in a humid environment and quickly recover and maintain a high output. In addition, the bracelet made of PP/AgH-TENG can collect the mechanical energy generated by human movement, and these output performance curves clearly reflect the state of human movement. This research has great application potential in the field of intelligent wearable selfpowered sensing.

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Rapid cleanup of oil spill is becoming a great challenge since crude oil is hard to clean up by conventional porous oil sorbents because of its high viscosity. Herein, novel fabrication of a hydrophobic/oleophilic and photothermal polydopamine (PDA)/FeCo 2 S 4 /polydimethylsiloxane (PDMS) coated polyurethane (PU) sponge using chemical polymerization and dip-coating methods is reported. The optimized composite sponge exhibits high hydrophobicity, high absorption capacity for oils and organic liquids, excellent chemical resistance, and stable recycling. Furthermore, PDA/FeCo 2 S 4 /PDMS@PU sponge shows outstanding photothermal conversion capability. Under sunlight irradiation, crude oil viscosity can be reduced by two orders of magnitude due to the rapid temperature rise in PDA/FeCo 2 S 4 /PDMS@PU sponge. In addition, a method of in situ pumping for uninterrupted recovery of oil spills from the water surface is designed. Benefiting from great mechanical performance and photothermal conversion capacity, the PDA/FeCo 2 S 4 /PDMS@PU sponge can be regarded as an ideal sorbent candidate for the collection of crude oil and treatment of largescale oil spill disasters.

The urgent need to address energy consumption and environmental issues has triggered a strong interest in triboelectric nanogenerators (TENGs), and thus, the exploration of novel materials with environmentally friendly characteristics and low cost for the preparation of high-output TENGs has shown great attraction. Herein, we proposed a method to increase the electron-donating ability of sodium carboxymethylcellulose (CMC) by adding polyethyleneimine (PEI) to CMC through simple physical mixing. By systematically adjusting and optimizing the CMC concentration and its content with PEI, it not only greatly improves the tribopositive performance of CMC but also makes the prepared film have excellent flexibility. The obtained CMC/PEI-TENG open-circuit voltage and short-circuit current can reach 385 V and 51 μA, respectively, with a maximum output power density of 1.056 mW/cm 2 , which can easily power 320 commercial LEDs. Moreover, the triboelectric output is improved by approximately 1.7 times compared to that of pure phase CMC film-based TENG. In addition, the new TENG shows great potential as a self-powered power source and sensor. The novel CMC-based composite film TENG proposed in this study provides a new idea for the development of environmentally friendly TENGs.

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