Background Two-dimensional porous carbon nanosheets are promising electrode materials for zinc-ion hybrid capacitors (ZIHC) due to large surface area, rapid ion transport kinetics and abundant exposed electroactive sites. Nevertheless, fabricating porous carbon nanosheets through a facile synthetic route remains a challenge. Method This study develops a template-free, one-step pyrolysis strategy utilizing a self-activation route with potassium L-aspartate as the precursor to synthesize porous carbon nanosheets. Findings The high-temperature pyrolysis process not only enables structural transformation from hollow polyhedra to porous nanosheets, but also realizes heteroatom self-doping and in-situ self-activation to generate porous frameworks. The optimized PCS-700 samples display a nanosheet-like architecture with a large specific surface area of 698.7 m2 g-1, abundant oxygen-containing functional groups, and trace nitrogen functional groups. The electrode delivers a specific capacitance of 339.4 F g-1 at 0.5 A g-1 and superior electrochemical stability. More importantly, the assembled PCS-700//ZnSO4(aq)//Zn ZIHC achieves a specific capacity of 151.3 mAh g-1 at 0.1 A g-1, a high energy density of 121 Wh kg-1 at 80 W kg-1, and 97.9% capacitance retention after 10,000 cycles. This method avoids multi-step operations, toxic reagents and complicated template removal procedures, thus offering a facile and scalable route to fabricate porous carbon nanosheets for ZIHCs.
Fruit softening is the dominant factor leading to postharvest quality loss and limited shelf life in strawberry. Although ethylene and abscisic acid (ABA) are both involved in regulating strawberry softening, the molecular mechanism underlying their crosstalk remains largely unclear. This study systematically characterized the FamiR161-FaNCED1 regulatory module via yeast one-hybrid, dual-luciferase assay and fruit transient transformation. The results demonstrate that FaERF6 directly binds to the FaMIR161 promoter and transcriptionally activates FamiR161 expression; FamiR161 in turn post-transcriptionally represses FaNCED1 to suppress ABA biosynthesis; finally, accumulated ABA further activates the ABA-responsive transcription factor FaABI5 to promote FaPG1 transcription and accelerate cell wall degradation. These findings reveal a novel miRNA-mediated regulatory cascade linking ethylene and ABA signaling, providing theoretical support for the postharvest preservation of strawberry fruit.
Broccoli is prone to yellowing during postharvest storage, which severely compromises its commercial value and nutritional quality. As a fatty acid amide, erucamide has not previously been investigated in postharvest preservation. This study evaluated the regulatory effects of exogenous erucamide (50 μM) on postharvest broccoli quality. Erucamide treatment markedly delayed yellowing by suppressing chlorophyll degradation gene expression and reducing carotenoid accumulation (zeaxanthin, lutein, β-carotene, β-cryptoxanthin). Meanwhile, it elevated senescence-delaying hormones (melatonin, gibberellin, indole-3-acetic acid and brassinolide) while reducing senescence-promoting hormones (ethylene, abscisic acid), indicating coordinated hormonal reprogramming. These findings demonstrate that erucamide effectively delays postharvest yellowing by integrating pigment metabolism with endogenous hormone balance, expanding its known regulatory roles and supporting its development as an eco-friendly preservative.
Co-creation of souvenirs has become a common strategy for selling souvenirs to tourists. This study explored the impact of souvenir co-creation on tourists' impulsive purchase intentions using the psychological ownership theory. Three experimental studies were conducted to prove that souvenir co-creation can increase tourists' impulsive purchase intentions of souvenirs. Psychological ownership mediated this effect. Furthermore, tourist mindset moderated the relationship between souvenir co-creation and psychological ownership. In addition to adding to the existing knowledge on souvenir purchases, this study offers practical recommendations on how souvenir vendors can encourage tourists to make impulsive purchases of souvenirs. Specifically, the findings suggested that providing the opportunity to co-create the souvenirs is a good strategy.
In order to enhance the service life of the oil tubes, FeCoNiCrMox coatings were fabricated on the inner walls of 316 tubes by laser cladding. The effects of Mo content on the phase structure, microstructure, tribological properties and electrochemical corrosion behavior of the samples were systematically investigated. It was shown that the phase of the coating was transformed from FCC (x = 0, 0.2) to FCC + σ (x = 0.5, 1). With the increase of Mo content, the coating was strengthened by solid solution strengthening, grain refinement and second-phase strengthening, resulting in improved hardness (Momax1.0 = 415.5 HV0.3) and wear resistance. In the electrolyte, increasing Mo content caused the corrosion potential of the coating to shift positively and the corrosion current density Icorr to decrease, with the minimum value of IcorrMo0.2 = 1.265 × 10−6A·cm−2, thus enhancing the corrosion resistance. However, when the Mo content was excessively high, the σ phase precipitated, which induced electrochemical reactions in the coating and thereby degraded its corrosion resistance.
