光催化
材料科学
石墨氮化碳
结晶度
氮化物
吸收(声学)
多孔性
可见光谱
缩二脲试验
氮气
化学工程
碳纤维
辐照
催化作用
纳米技术
化学
光电子学
有机化学
复合材料
工程类
核物理学
物理
复合数
图层(电子)
尿素
作者
Cheng Cheng,Jinwen Shi,Linyuan Wen,Chung‐Li Dong,Yu‐Cheng Huang,Yazhou Zhang,Shichao Zong,Zhidan Diao,Shaohua Shen,Liejin Guo
出处
期刊:Carbon
[Elsevier]
日期:2021-08-01
卷期号:181: 193-203
被引量:81
标识
DOI:10.1016/j.carbon.2021.05.030
摘要
Precursor types play crucial factors for synthesizing high-efficiency graphitic carbon nitrides (GCNs). Herein, biuret was employed as a new precursor to prepare a disordered nitrogen-defect-rich porous GCN (BCN). The crystallinity, structure and performance properties for BCN were explored by making systematic comparisons with other commonly available GCNs which were derived from conventional precursors under the identical conditions. Biuret could be the optimal choice for the preparation of high-performance GCN according to the reports so far. BCN not only possessed long-range atomic disordered structure, but also contained numerous nitrogen defects embedded into the in-planes of the disordered GCN networks, leading to extended visible-light absorption (absorption edge at 525 nm), improved separation of photoexcited charge carriers, and rich available reactive sites. The large surface area and high porosity of BCN also provided plenty of reactive sites. Consequently, ultrahigh photocatalytic H2 production and excellent O2 production performance were achieved for BCN, the AQY for H2 production achieved 45.5% at 420 nm, which was one of the highest values for GCN-based photocatalysts.
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