Tao Chen,Manli Wang,Donghang Hu,Qianlin Ju,Kaige Zhao,Liang Fu,Zelin Chen,Xiaolong Yu,Changjiu Li
The mainstream electrocatalysts for direct ethanol fuel cells (DEFCs) are Pt- or Pd-based nanomaterials, which are severely hampered by CO intermediate poisoning and the relatively low selectivity of the C1 pathway in anodic ethanol oxidation reaction (EOR), thereby impeding the efficiency enhancement and practical application of DEFCs. Herein, we report a Pt-decorated amorphous PdS nanowire [denoted as a-Pd(S)NWs/Pt] catalyst with abundant crystalline/amorphous heterogeneous interfacial active sites for alkaline EOR. The a-Pd(S)NWs/Pt was demonstrated a superior EOR mass activity of 6.16 A·mgPd+Pt–1, which is 22.81 times over that of commercial Pt/C (0.27 A·mgPt–1) and 34.22 times over that of commercial Pd/C (0.18 A·mgPd–1). Additionally, the a-Pd(S)NWs/Pt exhibited considerable stability, significantly enhanced resistance to CO poisoning and enhanced selectivity for the EOR C1 pathway. Density functional theory calculations and experimental results further revealed that the optimized COads and OHads binding energies due to the decoration of Pt nanoclusters can be responsible for the enhanced CO resistance and C1 selectivity of a-Pd(S)NWs/Pt. Furthermore, benefiting from its optimized electronic configuration at the interfacial active sites and the appropriate intermediate adsorption capacity, the a-Pd(S)NWs/Pt electrocatalyst was successfully extended to the electrocatalytic methanol and ethylene glycol oxidation reaction systems.
Oral ulcers may be addressed with various biomaterials infused with medications or cytokines. However, many patients derive little advantage from these substances due to inadequate adhesion, brief retention in the mouth, and diminished drug effectiveness. Here, we introduce a hydrogel patch (MPG3) consisting of a biopolymer matrix with light-activated adhesion features infused with platinum-decorated melanin nanoparticles that possess healing-promoting abilities. Initially, through straightforward local application, an adhesive hydrogel barrier forms over mucosal imperfections upon exposure to ultraviolet light. Following this, MPG3 exhibits outstanding oxygen production and reactive oxygen species elimination properties. These capabilities contribute to regulating the wound microenvironment, thereby expediting the wound's transition from the inflammatory to the proliferative stage. In rat models of oral ulcers, the MPG3 patch hastens recovery by modulating the inflammatory milieu of the damaged tissue and fostering expedited re-epithelialization and blood vessel formation. Conclusively, this light-activated adhesive hydrogel shows promise for swift wound healing and could revolutionize therapeutic approaches for treating clinical oral ulcers, especially in diabetic patients.
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