• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Surface Science >Two-dimensional porous architecture of protonated GCN and reduced graphene oxide via electrostatic self-assembly strategy for high photocatalytic hydrogen evolution under visible light
【24h】

Two-dimensional porous architecture of protonated GCN and reduced graphene oxide via electrostatic self-assembly strategy for high photocatalytic hydrogen evolution under visible light

机译：质子化的GCN和氧化石墨烯的二维多孔结构通过静电自组装策略在可见光下高光催化氢释放

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Herein, porous protonated graphitic carbon nitride (pGCN) is prepared from bulk g-C3N4 (GCN) directly by acidic cutting and hydrothermal process. The holey structure not only provides a lot of bounds on the accelerated and photo induced charge transfer and thus reduce the aggregation, but also endows the GCN with more exposure to the active site. The pGCN is obtained with an increased band gap of 2.91 eV together with a higher specific surface area of 82.76 m(2)g(-1). Meanwhile, the positively charged GCN resulted from the protonation pretreatment is beneficial for improving the interaction with negatively charged GO sheets. Compared with GCN, pGCN-rGO displays a significant decrease of PL intensities and an apparently enhancement of visible-light absorption, resulting a lower charge recombination rate and a better light absorption. Besides, the enhanced charge separation is demonstrated by photoluminescence emission spectroscopy and the transient photocurrent measurement. The photocatalytic performance studies for the degradation of MB indicate that pGCN-rGO exhibits the highest adsorption ability towards dye molecules. In addition, the pGCN-5 wt% rGO composite shows the optimal photocatalytic activity, the photodegradation rate of MB is 99.4% after 80 min of irradiation and the H-2 evolution performance up to 557 mu mol g(-1)h(-1) under visible light, which is much higher than the other control samples. (C) 2016 Elsevier B.V. All rights reserved.
机译：这里，多孔质子化的石墨碳氮化物（pGCN）是由块状g-C3N4（GCN）直接通过酸性切割和水热法制备的。多孔结构不仅为加速和光诱导的电荷转移提供了很多限制，从而减少了聚集，而且使GCN更加暴露于活性位点。获得的pGCN具有增加的2.91 eV带隙和更高的比表面积82.76 m（2）g（-1）。同时，质子化预处理产生的带正电荷的GCN有利于改善与带负电荷的GO片的相互作用。与GCN相比，pGCN-rGO的PL强度显着降低，可见光吸收明显增强，从而使电荷复合率降低，光吸收率提高。此外，通过光致发光发射光谱法和瞬态光电流测量证明了增强的电荷分离。对MB降解的光催化性能研究表明，pGCN-rGO对染料分子表现出最高的吸附能力。此外，pGCN-5 wt％rGO复合材料表现出最佳的光催化活性，辐照80分钟后MB的光降解率为99.4％，H-2分解性能高达557μmol g（-1）h（- 1）在可见光下，其远高于其他对照样品。 （C）2016 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号