文献类型：期刊文献

英文题名：Self-modified breaking hydrogen bonds to highly crystalline graphitic carbon nitrides nanosheets for drastically enhanced hydrogen production

作者：Iqbal, Waheed[1];Qiu, Bocheng[1];Zhu, Qiaohong[1];Xing, Mingyang[1];Zhang, Jinlong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Chem Engn, Key Lab Adv Mat & Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2018

卷号：232

起止页码：306

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20181304964229);WOS:【SCI-EXPANDED(收录号:WOS:000434004300033)】；

基金：This work was supported by the National Natural Science Foundation of China (21773062, 21577036, 5171101651 and 21677048), State Key Research Development Program of China (2016YFA0204200), the "Chenguang Program" from Shanghai Education Development Foundation and Shanghai Municipal Education Commission (14CG30), the Science and Technology Commission of Shanghai Municipality (16JC1401400, 17520711500), Shanghai Pujiang Program (17PJD011), and the Fundamental Research Funds for the Central Universities (22A201514021).

语种：英文

外文关键词：Graphitic carbon nitrides; Highly crystalline; High-yield synthesis; Hydrogen bonds; Hydrogen evolution

摘要：Highly crystalline graphitic carbon nitride (g-C3N4) possesses the high separation efficiency of photogenerated electron-hole pairs owing to the significantly decreased intralayer hydrogen bonds, which leads to drastic improvement of photocatalytic activity. However, the preparation of such g-C3N4 material remains a challenge by a simple and economic thermal-treatment in a furnace. Herein, we report a novel and effective strategy for high yield synthesis of extremely active crystalline carbon nitride nanosheets (CCNNSs) by two-step calcination without the assistance of any additive or salt intercalation. As expected, the as-prepared CCNNSs exhibit a remarkably high hydrogen evolution rate of 9577.6 pmol h(-1) g(-1) under simulated solar light irradiation, which is 15.5 times than that of bulk g-C3N4, as well as higher than most of the reported crystalline g-C3N4. Moreover, a highly apparent quantum efficiency of 9.01% at 420 nm for hydrogen evolution can be achieved, which is also superior to the reported crystalline g-C3N4. Such two-step calcination approach not only provides an economical way to effectively regulate the crystallinity of bulk g-C3N4, but also achieves the preparation of CCNNSs with high yield. Our research opens up a new window to self-modification and fabrication of highly active metal-free photocatalysts for solar light-driven hydrogen production.