材料科学
碳纤维
光催化
超快激光光谱学
吸收光谱法
兴奋剂
无定形碳
光电子学
氮气
化学
吸收(声学)
分析化学(期刊)
无定形固体
光化学
光谱学
光学
有机化学
催化作用
复合数
物理
复合材料
量子力学
作者
Benjamin Martindale,Georgina A. M. Hutton,Christine A. Caputo,Sebastian Prantl,Robert Godin,James R. Durrant,Erwin Reisner
标识
DOI:10.1002/anie.201700949
摘要
Single-source precursor syntheses have been devised for the preparation of structurally similar graphitic carbon dots (CDs), with (g-N-CD) and without (g-CD) core nitrogen doping for artificial photosynthesis. An order of magnitude improvement has been realized in the rate of solar (AM1.5G) H2 evolution using g-N-CD (7950 μmolH2 (gCD )-1 h-1 ) compared to undoped CDs. All graphitized CDs show significantly enhanced light absorption compared to amorphous CDs (a-CD) yet undoped g-CD display limited photosensitizer ability due to low extraction of photogenerated charges. Transient absorption spectroscopy showed that nitrogen doping in g-N-CD increases the efficiency of hole scavenging by the electron donor and thereby significantly extends the lifetime of the photogenerated electrons. Thus, nitrogen doping allows the high absorption coefficient of graphitic CDs to be translated into high charge extraction for efficient photocatalysis.
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