Using sodium alginate/polyvinyl alcohol (SA/PVA) hydrogel as the matrix and phosphorus-doped carbon nitride (p-C3N4) prepared by thermal polymerization as a flame retardant,flame-retardant hydrogel electrolytes (p-C3N4/SA/PVA) were fabricated through a freeze-thaw cycling method.Structural characterization and thermal stability tests were conducted on p-C3N4/SA/PVA using scanning electron microscopy,fourier transform infrared,ultraviolet,X-ray diffraction,as well as thermogravimetric analysis and combustion tests.Furthermore,electrochemical performance tests were performed on an integrated supercapacitor utilizing p-C3N4/SA/PVA hydrogel as the electrolyte.The results indicated that p-C3N4 was successfully prepared and evenly distributed in the gel matrix.Compared with SA/PVA hydrogel,the initial degradation temperature of the p-C3N4/SA/PVA hydrogel was increased from 108℃ to 157℃,and the residual carbon content was improved from 33.5% to 46%.After combustion,a dense residual carbon layer was formed,and the degree of graphitization was enhanced.In addition,the p-C3N4/SA/PVA hydrogel-based integrated supercapacitor exhibited excellent rate performance and capacitance characteristics,enabling it to illuminate LED lights when connected in series.
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基金资助
运城学院博士科研启动项目(YQ2022008);山西省教学改革创新项目(J20231206)
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