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本文首次报道了自下而上液相合成褶皱石墨烯,所使用的制备方法为:卤化高分子聚偏二氟乙烯(PVDF)在崎岖的强碱CaC_2表面进行脱官能团碳化.因PVDF的官能团脱除需要CaC_2的存在,导致二者的界面反应深度受限,故经由CaC_2脱官能团并模板得到的褶皱薄层碳材料的厚度非常小,继续高温焙烧可将薄层碳转化为寡层(3~6层)石墨烯,通过BET测试分析所得到的褶皱石墨烯(CrG)在900°C下焙烧具有高达~324.8 m~2 g~(-1)的比表面积.经过N掺杂修饰的CrG应用于电化学催化氧气还原反应(ORR),发现其具有和商用铂碳催化剂(20 wt.%Pt/C)相当的起峰电位和半波电位,且具有更为优秀的促进载荷物质在其孔道内的输运行为.更为有趣的是:通过增加催化剂的负载量,N掺杂的CrG表现出极限电流的稳定增加,而Pt催化剂无此行为,这种特性可潜在提供给整装器件更高密度的比能量.
In this paper, the first report of the liquid-phase synthesis of folded graphene from bottom to top was prepared by halogenated macromolecule polyvinylidene fluoride (PVDF) on the surface of rugged, strong alkali CaC_2, In addition to the presence of CaC 2, which leads to a limited depth of interface reaction between the two, the thickness of the folded thin carbon material obtained through CaC 2 removal and template is very small, 6) graphene, and the resulting graphene graphene (CrG) has a specific surface area up to ~ 324.8 m ~ 2 g ~ (-1) calcined at 900 ° C by BET test analysis.CrG modified with N doping Electrochemical catalyzed oxygen reduction reaction (ORR) was found to have a peak and half-wave potential comparable to commercial platinum-on-carbon catalyst (20 wt.% Pt / C) with more excellent loading promoting material in its pores More interestingly, N-doped CrG shows a steady increase in the limiting current by increasing the loading of the catalyst, but this is not the case for the Pt catalyst, a feature that can potentially be provided to packaged devices High-density than energy.