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应用多元醇法通过调控NaCl(间接晶种)的量,快捷方便地制备出银纳米线(SNWs)和银纳米粒子(SNPs),采用SEM、EDS、XRD和UV-Vis表征了纳米材料的形貌、元素组成、晶相结构和尺寸分布范围。结果表明,两种银纳米材料形貌均一,均为面心立方晶体结构。通过线性电位扫描法测定发现,SNWs和SNPs在碱性条件下对氧还原反应(ORR)具有不同的电催化活性,SNWs与SNPs对比,其起始还原电位正移70 mV,峰电位正移50 mV,还原峰电流前者是后者的1.8倍。SNWs表现出更好的催化性能。抗醇性能研究表明,SNWs对甲醇具有较好的抗醇性能,而SNPs对乙醇具有较好的抗醇性能,2种纳米材料均对异丙醇的抗醇性能均较差。
The silver nanowires (SNWs) and silver nanoparticles (SNPs) were prepared quickly and conveniently by adjusting the amount of NaCl (indirect seed crystals) by the polyhydric alcohol method. The morphology of the nanomaterials was characterized by SEM, EDS, XRD and UV- Appearance, elemental composition, crystal structure and size distribution. The results show that the morphology of two silver nanomaterials is uniform and all are face-centered cubic crystal structure. The results of linear potential scan showed that SNWs and SNPs had different electrocatalytic activity towards oxygen reduction reaction (ORR) under alkaline conditions. Compared with SNPs, SNWs and SNPs showed a positive shift of 70 mV and a positive shift of 50 mV, the former peak current reduction is 1.8 times of the latter. SNWs show better catalytic performance. The study of alcohol resistance showed that SNWs had better alcohol resistance to methanol, while SNPs had better alcohol resistance to ethanol. Both of the two nanomaterials had poor alcohol resistance to isopropanol.