Qi Qin

Development of multifunctional triboelectric nanogenerators (TENGs) capable of efficiently harvesting diverse low-frequency mechanical energies for self-powered systems remains a significant challenge. To address this issue, we designed and fabricated a zigzag-origami-structured TENG based on composite films by integrating a zinc coordination polymer (Zn-CP ) with ethylcellulose (EC), aiming to convert human-motion and water-wave energies into electricity to drive a self-powered photo-induced oxidation system. A series of flexible Zn-CP@EC composite films with varying Zn-CP contents were prepared, among which the 10% Zn-CP@EC composite film exhibited the best triboelectric performance. By scaling the film dimensions and integrating multiple origami-structured 10% Zn-CP@EC-TENGs (Z-TENGs ), the output performance was further enhanced, with the six-unit device (Z-6 ) showing the best performance under palm pressure. The Z-6 device, encapsulated in a plastic enclosure, was deployed in an oscillating water tank to harvest wave energy, which successfully powered LEDs as light sources for the photo-induced oxidation of aldehydes to carboxylic acids with high selectivity and efficiency. This work demonstrates that CP-based composite films can serve as effective triboelectric materials for scalable TENGs, enabling the realization of self-powered photochemical systems driven by diverse environmental mechanical energies.

Isostructural bifunctional Cu-MOFs with different valence states were synthesized to optimize the performance of Cu-MOF-based TENGs, which can power blue LEDs to realize photocatalytic continuous-flow reactions under Cu-MOFs catalysis.

The solid fillers incorporated into poly(ethylene oxide) (PEO) matrix are prone to agglomeration due to their high surface energy or strong van der Waals forces, consequently resulting in a deterioration of the ionic conductivity in PEO-based solid polymer electrolytes (SPEs). Herein, reduced graphene oxide (RGO)/ZnO composites as solid fillers were fabricated via simply annealing method. In RGO/ZnO composites, ZnO nanoparticles featuring abundant oxygen vacancies are homogeneously dispersed and firmly anchored onto both sides of the RGO sheets, constructing a 3D continuous channel for Li ⁺ ions transport. Due to the synergistic interplay of hydrogen bonding interactions and Lewis acid-base interactions between RGO/ZnO and TFSI ⁻ ions, the fabricated PEO/RGO/ZnO (PRZ) SPE exhibits an excellent ionic conductivity of 5.3 × 10 ⁻⁴ S cm ⁻¹ , a high t _Li+ of 0.48, and an electrochemical stability window of 5.4 V at 60 °C. Moreover, the Li|PRZ|Li symmetric cell delivers a long-term stable cycling over 800 h under a current density of 0.1 mA cm ⁻² at 60 °C. As a result, the assembled all-solid-state LFP|PRZ|Li cell provides an initial specific discharge capacity of 154.7 mA h g ⁻¹ and an impressive capacity retention of 92.2% after 100 cycles at a current density 0.2 C under 60 °C.

Cathodic exfoliation graphene (GN) reinforced epoxy resin (EP) composite materials were prepared by the solution blending method. Elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), Raman spectra (Raman), X-ray diffraction (XRD) and scanning electron spectroscopy (SEM) results demonstrate that GN nanosheets are well exfoliated in organic solvents and dispersed in EP. The tensile and flexural properties of the composite materials were tested using a universal tensile machine. Results showed that the added GN can significantly improve the tensile and flexural properties of composites. When the amount of GN loading is 1.0 wt %, the tensile strength, elongation at break, flexural strength and flexural modulus of GN/EP composite materials can be up to 96.77 MPa, 5.61%, 115.38 MPa, and 3507.8 MPa, respectively. The possible mechanism is that good interfacial bonding between the GN and matrix is account for the observed improvements in tensile and flexural properties.

A one-step electrodeposition method was employed to synthesize the trimetallic alloy NiFeCo as a non-noble metal catalyst for methanol oxidation reaction in a direct methanol fuel cell. The structure of samples was characterized by X-ray diffraction and Fourier-transform infrared spectroscopy, while the surface morphology was observed by scanning electron microscope. The results confirmed the successful synthesis of the NiFeCo/PANI/GR composite materials. Furthermore, the electrocatalytic performances of the composite materials toward methanol oxidation reaction in an alkaline medium were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and chronoamperometry. The result showed that the composite electrodeposited under 0.4 V can exhibit excellent catalytic performance for the methanol oxidation reaction. The peak current density of catalytic methanol oxidation reached 43 mA cm⁻². According to chronoamperometric analysis, the current density was stable during 1000 s and finally remained 14.5% of the initial current density, it demonstrated the remarkable stability.

Interweaved SP-MoS ₂ nanosheets possessed a more negative K ⁺ average adsorption energy and exhibited superior specific capacitance and rate capability.

The self-assembled L-MoS ₂ nanoflowers exhibited superior specific capacitance and rate capability.