Simultaneous sulfur doping and exfoliation of graphene from graphite using an electrochemical method for supercapacitor electrode materials
Simultaneous sulfur doping and exfoliation of graphene from graphite using an electrochemical method for supercapacitor electrode materials
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DOI：
10.1039/c5ta07963b
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Cho, Moo Hwan
中科院分区：
文献类型：
--
作者：
Parveen, Nazish;Ansari, Mohd Omaish;Cho, Moo Hwan
杂原子掺杂已成为修饰石墨烯（GN）电子性质和提高其电化学性能的重要策略。本研究开发了一种环境友好、经济、简便的一锅法电化学合成硫掺杂石墨烯（S-GN）。硫代硫酸钠（Na 2S 2 O3），除了作为硫源，还催化剥离过程，导致硫掺杂的GN结构。石墨向GN的剥离和硫（S）掺杂同时发生，导致良好分散的S-GN骨架。透射电子显微镜和高分辨率透射电子显微镜揭示了S-GN中杂原子的存在，X射线光电子能谱证实了高S含量（3.47%），以及高质量硫化物种（主要为C-S-C-）的存在。在剥离过程中掺入的S物种在GN中修改的GN中的碳的表面化学。在水溶液中，S-GN电极在3 A g（-1）电流密度下的比电容为320 F g（-1），在5161 W kg（-1）功率密度下的能量密度为160 W h kg（-1），循环稳定性高达1500次。
Doping with heteroatoms has become a significant strategy for modifying the electronic properties and enhancing the electrochemical properties of graphene (GN). In this study, an environmental friendly, economical and facile one pot electrochemical method was developed to synthesize sulfur-doped graphene (S-GN). Sodium thiosulphate (Na2S2O3), in addition to acting as a sulfur source, also catalyzed the exfoliation process, resulting in sulfur-doped GN structures. The exfoliation of graphite to GN and sulfur (S) doping occurred simultaneously resulting in well dispersed S-GN frameworks. Transmission electron microscopy and high-resolution transmission electron microscopy revealed the presence of the heteroatom in S-GN, and X-ray photoelectron spectroscopy confirmed the high S content (3.47%), as well as the existence of high-quality sulphureted species (mainly as C-S-C-). The incorporation of S species in GN during the exfoliation process modified the surface chemistry of carbon in the GN. The electrochemical performance of the as-prepared S-GN electrode exhibited a high specific capacitance of 320 F g(-1) at a current density of 3 A g(-1) and excellent cycling stability up to 1500 cycles as well as high energy density of 160 W h kg(-1) at a power density of 5161 W kg(-1) in an aqueous electrolyte.