以湿法制备的硫溶胶和氧化石墨烯为前驱体,采用水热法还原不同酸碱体系的氧化石墨烯,制备石墨烯-硫复合材料。通过XRD和场发射扫描电子显微镜（FESEM）等对产物进行分析。石墨烯以薄膜状包覆在硫颗粒表面。恒流充放电、交流阻抗和循环...以湿法制备的硫溶胶和氧化石墨烯为前驱体,采用水热法还原不同酸碱体系的氧化石墨烯,制备石墨烯-硫复合材料。通过XRD和场发射扫描电子显微镜（FESEM）等对产物进行分析。石墨烯以薄膜状包覆在硫颗粒表面。恒流充放电、交流阻抗和循环伏安测试结果表明：180℃、酸性条件下水热12 h制备的复合材料电化学性能较好,以0.2 m A/cm2的电流密度在1.5-3.0 V充放电,首次放电比容量为803.72 m Ah/g,循环20次衰减至592.40 m Ah/g,容量保持率为73.71%。展开更多
Graphitic carbon nitride(g-C3N4,CN)has attracted increasing interests in the field of photocatalysis due to its high visible-light-response.However,its photocatalytic activity is still lower for degradation of refract...Graphitic carbon nitride(g-C3N4,CN)has attracted increasing interests in the field of photocatalysis due to its high visible-light-response.However,its photocatalytic activity is still lower for degradation of refractory contaminants such as Cr(Ⅵ)and Rhodamine B(RhB)etc.Herein,we report a facile method to synthesize a novel sulfur(S)-doped CN/reduced graphene oxide(rGO)porous nanosheet(S-CN/rGO PNs)via a supramolecular self-assembling followed by a solvothermal treatment.The as-prepared porous SCN/rGO PNs are stable with high specific surface area^188.5 m2 g-1 and exhibit a significantly enhanced photocatalytic activity of^17-fold and 15-fold higher than that of bulk CN for the degradation of RhB and Cr(Ⅵ)under visible light irradiation,respectively.Typically,50 mL of 15 mg/mL RhB can be degraded within 20 min by 10 mg S-CN/rGO PNs.The mechanism can be explained by the synergistic effect of S doping and porous structure which can effectively reduce the band gap of CN and increase the specific surface area to promote the separation and transfer of photo-generated charge carriers.The results have provided a new way to significantly enhance the photocatalytic activity of g-C3N4 for degradation of refractory contaminants.展开更多
文摘以湿法制备的硫溶胶和氧化石墨烯为前驱体,采用水热法还原不同酸碱体系的氧化石墨烯,制备石墨烯-硫复合材料。通过XRD和场发射扫描电子显微镜（FESEM）等对产物进行分析。石墨烯以薄膜状包覆在硫颗粒表面。恒流充放电、交流阻抗和循环伏安测试结果表明：180℃、酸性条件下水热12 h制备的复合材料电化学性能较好,以0.2 m A/cm2的电流密度在1.5-3.0 V充放电,首次放电比容量为803.72 m Ah/g,循环20次衰减至592.40 m Ah/g,容量保持率为73.71%。
基金the Science and Technology Major Project of Shanxi Province(Grant Numbers MC2016-06)National Natural Science Foundation of China(21173041)the Opening Project of Jiangsu Key Laboratory of Advanced Metallic Materials,China.
文摘Graphitic carbon nitride(g-C3N4,CN)has attracted increasing interests in the field of photocatalysis due to its high visible-light-response.However,its photocatalytic activity is still lower for degradation of refractory contaminants such as Cr(Ⅵ)and Rhodamine B(RhB)etc.Herein,we report a facile method to synthesize a novel sulfur(S)-doped CN/reduced graphene oxide(rGO)porous nanosheet(S-CN/rGO PNs)via a supramolecular self-assembling followed by a solvothermal treatment.The as-prepared porous SCN/rGO PNs are stable with high specific surface area^188.5 m2 g-1 and exhibit a significantly enhanced photocatalytic activity of^17-fold and 15-fold higher than that of bulk CN for the degradation of RhB and Cr(Ⅵ)under visible light irradiation,respectively.Typically,50 mL of 15 mg/mL RhB can be degraded within 20 min by 10 mg S-CN/rGO PNs.The mechanism can be explained by the synergistic effect of S doping and porous structure which can effectively reduce the band gap of CN and increase the specific surface area to promote the separation and transfer of photo-generated charge carriers.The results have provided a new way to significantly enhance the photocatalytic activity of g-C3N4 for degradation of refractory contaminants.
