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学者姓名：孙再成
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摘要 ：
Fluorescent carbon dots are a novel type of nanomaterial. Due to their excellent optical properties, they have extensive application prospects in many fields. Studying the formation process and fluorescence mechanism of CDs will assist scientists in understanding the synthesis of CDs and guide more profound applications. Due to their conjugated structures, aromatic compounds have been continuously used to synthesize CDs, with emissions ranging from blue to NIR. There is a lack of a systematic summary of the formation process and fluorescence mechanism of aromatic precursors to form CDs. In this review, the formation process of CDs is first categorized into three main classes according to the precursor types of aromatic compounds: amines, phenols, and polycyclics. And then, the fluorescence mechanism of CDs synthesized from aromatic compounds is summarized. The challenges and prospects are proposed in the last section.
关键词 ：
fluorescence mechanism fluorescence mechanism aromatic compounds aromatic compounds formation process formation process carbon dots carbon dots
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| GB/T 7714 | Xue, Shanshan , Li, Pengfei , Sun, Lu et al. The Formation Process and Mechanism of Carbon Dots Prepared from Aromatic Compounds as Precursors: A Review [J]. | SMALL , 2023 , 19 (31) . |
| MLA | Xue, Shanshan et al. "The Formation Process and Mechanism of Carbon Dots Prepared from Aromatic Compounds as Precursors: A Review" . | SMALL 19 . 31 (2023) . |
| APA | Xue, Shanshan , Li, Pengfei , Sun, Lu , An, Li , Qu, Dan , Wang, Xiayan et al. The Formation Process and Mechanism of Carbon Dots Prepared from Aromatic Compounds as Precursors: A Review . | SMALL , 2023 , 19 (31) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Carbon dots (CDs) as the advancing fluorescent carbon nanomaterial have superior potential and prospective. However, the ambiguous photoluminescence (PL) mechanism and intricate structure-function relationship become the greatest hindrances in the development and applications of CDs. Herein, red emissive CDs were synthesized in high yield from o-phenylenediamine (oPD) and catechol (CAT). The PL mechanism of the CDs is considered as the molecular state fluorophores because 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) is separated and exhibits the same PL properties and behavior as the CDs. These include the peak position and shape of the PL emission and PL excitation and the emission dependence on pH and solvent polarity. Both of them display close PL lifetime decays. Based on these, we deduce that DHQP is the fluorophore of the red emissive CDs and the PL mechanism of CDs is similar to DHQP. During the PL emission of CDs, the electron of the molecule state can transfer to CDs. The formation process of DHQP is further confirmed by the reaction intermediates (phthalazine, dimers) and oPD. These findings provide insights into the PL mechanism of this type of CDs and may guide the further development of tunable CDs for tailored properties.
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| GB/T 7714 | Li, Pengfei , Xue, Shanshan , Sun, Lu et al. Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system [J]. | LIGHT-SCIENCE & APPLICATIONS , 2022 , 11 (1) . |
| MLA | Li, Pengfei et al. "Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system" . | LIGHT-SCIENCE & APPLICATIONS 11 . 1 (2022) . |
| APA | Li, Pengfei , Xue, Shanshan , Sun, Lu , Zong, Xupeng , An, Li , Qu, Dan et al. Formation and fluorescent mechanism of red emissive carbon dots from o-phenylenediamine and catechol system . | LIGHT-SCIENCE & APPLICATIONS , 2022 , 11 (1) . |
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摘要 ：
The solar H-2 generation directly from natural seawater is a sustainable way of green energy. However, it is limited by a low H-2 generation rate even compared to fresh water. In this report, TiO2 is chosen as a model photocatalyst to disclose the critical factor to deteriorate the H-2 generation rate from seawater. The simulated seawater (SSW), which is composed of eight ions (Na+, K+,Ca2+, Mg2+, Cl-, Br-, SO42-, and CO32-), is investigated the effect of each ion on the H-2 production. The results indicate that all ions have a negative effect at the same concentration as in the seawater except Br-. The CO32- has the most serious deterioration, and the H-2 production rate lowers near 40% even at [CO32-] of 1.5 mmol- L-1. The H-2 production rate can be recovered to 85% if the CO32- is excluded from the SSW. To understand the reason, the zeta potential of the TiO2 treated with different ions aqueous solution reveals that the zeta potential decreases when it is treated with CO32- and SO42- due to they can adsorb on the surface of TiO2 nanoparticles. Fourier transform infrared (FTIR) and thermogravimetric analysis-mass spectroscopy (TGA-MS) further confirm that the adsorbed ion is mainly from CO32-. Since the pH of seawater is about 8.9 between pK(a1) (6.37) and pK(a2) (10.3) of H2CO3, the CO32- should exist in the form of HCO3- in the seawater. We proposed a simple method to remove the adsorbed HCO3- from the TiO2 surface by adjusting the pH below the pK al . The results indicate that if a trace amount of HCI (adjusting pH similar to 6.0) is added to the SSW, the H-2 production rate can be recovered to 85% of that in pure water.
关键词 ：
H-2 production rate H-2 production rate seawater seawater pH pH adsorb ions adsorb ions
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| GB/T 7714 | He, Yaqian , Li, Pengfei , Liu, Wenning et al. The critical factors of photocatalytic H-2 production from seawater by using TiO2 as photocatalyst [J]. | NANO RESEARCH , 2022 , 16 (4) : 4620-4624 . |
| MLA | He, Yaqian et al. "The critical factors of photocatalytic H-2 production from seawater by using TiO2 as photocatalyst" . | NANO RESEARCH 16 . 4 (2022) : 4620-4624 . |
| APA | He, Yaqian , Li, Pengfei , Liu, Wenning , An, Li , Qu, Dan , Wang, Xiayan et al. The critical factors of photocatalytic H-2 production from seawater by using TiO2 as photocatalyst . | NANO RESEARCH , 2022 , 16 (4) , 4620-4624 . |
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摘要 ：
It is a challenging task to overcomes the bottleneck of N2 adsorption and activation in N2 reduction reaction (NRR). Regulating the catalyst surface electronic state is treated as a potential strategy to prevail over the barrier. Here, Incorporating Fe as a dopant in the TiO2 nanoparticles can generate oxygen vacancies and dopant energy levels, promoting the adsorption and activation of N2 molecules. F surface modification induces Fe (III) in the high spin state and upshifts the dopant energy level. That facilitates Fe 3d electrons backdonation to N 1ag* orbital promotes the activation of N2 molecule and reduces the limiting potential of NRR. Therefore, F-Fe: TiO2 electrocatalyst achieved the highest Faradaic efficiency and maximum NH3 production rate of 27.67% and 27.86 mu g h-1 mgcat. -1 at -0.5 V v.s. reversible hydrogen electrode. This work provides deep insights into the design surface electronic state of catalyst toward efficient N2 to NH3 conversion.
关键词 ：
N-2 Fixation N-2 Fixation Iron doping Iron doping Electrocatalysis Electrocatalysis Surface fluorine treatment Surface fluorine treatment Surface electronic state manipulation Surface electronic state manipulation
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| GB/T 7714 | Song, Guangxin , Gao, Rui , Zhao, Zhao et al. High-spin state Fe(III) doped TiO2 for electrocatalytic nitrogen fixation induced by surface F modification [J]. | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 301 . |
| MLA | Song, Guangxin et al. "High-spin state Fe(III) doped TiO2 for electrocatalytic nitrogen fixation induced by surface F modification" . | APPLIED CATALYSIS B-ENVIRONMENTAL 301 (2022) . |
| APA | Song, Guangxin , Gao, Rui , Zhao, Zhao , Zhang, Yujun , Tan, Huaqiao , Li, Haibo et al. High-spin state Fe(III) doped TiO2 for electrocatalytic nitrogen fixation induced by surface F modification . | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 301 . |
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摘要 ：
The XC-72R supported Pd catalysts exhibit low-temperature catalytic activity for CO oxidation under light irradiation. The CO conversion can reach 100% with the light irradiation of 900 mW center dot cm-2 at a catalyst temperature of 100 degrees C. Pd/C catalysts with different Pd loading have similar performance enhancement under light irradiation. The activation energy of 1% Pd/C catalyst remains unchanged implying that CO oxidation belongs to photothermal catalytic oxidation. The enhanced performance could be ascribed to ultrahigh surface temperature (275 degrees C) induced by the light irradiation of 800 mW center dot cm-2 and detected by an IR camera. That is higher than the catalyst temperature (187 degrees C) measured by the thermocouple. Carbon generates a higher temperature than Pd NP, causing heat transfers from carbon to Pd NP. In contrast, Pd NP produces a higher temperature than Al2O3 for Pd/Al2O3 catalyst, and heat is transferred from Pd to Al2O3. These demonstrate that the enhanced performance contributes to the photothermal effect of carbon.
关键词 ：
Carbon Carbon Photothermal Photothermal Catalytic CO oxidation Catalytic CO oxidation Palladium Palladium Local temperature Local temperature
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| GB/T 7714 | Liu, Ziwen , Niu, Lijuan , Zong, Xupeng et al. Ambient photothermal catalytic CO oxidation over a carbon-supported palladium catalyst [J]. | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 313 . |
| MLA | Liu, Ziwen et al. "Ambient photothermal catalytic CO oxidation over a carbon-supported palladium catalyst" . | APPLIED CATALYSIS B-ENVIRONMENTAL 313 (2022) . |
| APA | Liu, Ziwen , Niu, Lijuan , Zong, Xupeng , An, Li , Qu, Dan , Wang, Xiayan et al. Ambient photothermal catalytic CO oxidation over a carbon-supported palladium catalyst . | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 313 . |
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摘要 ：
To perform the electrochemical nitrogen reduction reaction (NRR) under milder conditions for sustainable ammonia production, electrocatalysts should exhibit high selectivity, activity, and durability. However, the key restrictions are the highly stable N N triple bond and the competitive hydrogen evolution reaction (HER), which make it difficult to adsorb and activate N-2 on the surface of electrocatalysts, leading to a low ammonia yield and Faraday efficiency. Inspired by the enzymatic nitrogenase process and using the Fe-Mo as the active center, here we report supported Fe2Mo3O8/XC-72 as an effective and durable electrocatalyst for the NRR. Fe2Mo3O8/XC-72 exhibited NRR activity with an NH3 yield of 30.4 mu g.h(-1).mg(-1) (-0.3 V) and a Faraday efficiency of 8.2% (-0.3 V). Theoretical calculations demonstrated that the electrocatalytic nitrogen fixation mechanism involved the Fe atom in the Fe2Mo3O8/XC-72 electrocatalyst acting as the main active site in the enzymatic pathway (*NH2 ->*NH3), which activated nitrogen molecules and promoted the NRR performance.
关键词 ：
Fe2Mo3O8/XC-72 electrocatalyst Fe2Mo3O8/XC-72 electrocatalyst nitrogen reduction reaction (NRR) nitrogen reduction reaction (NRR) density functional theory calculations density functional theory calculations
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| GB/T 7714 | Liu, Guohua , Niu, Lijuan , Ma, Zhixue et al. Fe2Mo3O8/XC-72 electrocatalyst for enhanced electrocatalytic nitrogen reduction reaction under ambient conditions [J]. | NANO RESEARCH , 2022 , 15 (7) : 5940-5945 . |
| MLA | Liu, Guohua et al. "Fe2Mo3O8/XC-72 electrocatalyst for enhanced electrocatalytic nitrogen reduction reaction under ambient conditions" . | NANO RESEARCH 15 . 7 (2022) : 5940-5945 . |
| APA | Liu, Guohua , Niu, Lijuan , Ma, Zhixue , An, Li , Qu, Dan , Wang, Dandan et al. Fe2Mo3O8/XC-72 electrocatalyst for enhanced electrocatalytic nitrogen reduction reaction under ambient conditions . | NANO RESEARCH , 2022 , 15 (7) , 5940-5945 . |
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| GB/T 7714 | Zong, Xupeng , Jiang, Wenshuai , Sun, Zaicheng . Efficient photocatalytic overall water splitting achieved with polymeric semiconductor-based Z-scheme heterostructures [J]. | SCIENCE CHINA-CHEMISTRY , 2021 , 64 (6) : 875-876 . |
| MLA | Zong, Xupeng et al. "Efficient photocatalytic overall water splitting achieved with polymeric semiconductor-based Z-scheme heterostructures" . | SCIENCE CHINA-CHEMISTRY 64 . 6 (2021) : 875-876 . |
| APA | Zong, Xupeng , Jiang, Wenshuai , Sun, Zaicheng . Efficient photocatalytic overall water splitting achieved with polymeric semiconductor-based Z-scheme heterostructures . | SCIENCE CHINA-CHEMISTRY , 2021 , 64 (6) , 875-876 . |
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摘要 ：
Photocatalytic N-2 fixation (PNF) provides a low-cost route to generate ammonia. The poor conversion efficiency from photon to ammonia seriously hinders the step forward because of the low concentration of N-2 molecules. Herein, we demonstrate a photocatalyst with surface oxygen vacancies (Vo) and a F modified surface to facilitate N-2 adsorption and activation on the surface of catalysts. The Vo site promotes the chemical adsorption of N-2, electron transfer from catalyst to N-2. F modification switches the TiO2 surface properties from hydrophilic to aerophilic, thus facilitating the adsorption of N-2. Meanwhile, the hydrogen reduction reaction (HER) is sup-pressed, as protons hard to adsorb on F capped surfaces. The optimal NH3 production rate can reach 206 mu molh(-1)g(-1), which is similar to 9 times higher than that of pure TiO2 nanoparticles (similar to 23 mu molh(-1)g(-1)). This report provides a potential strategy to overcome mass transfer limitation and achieve a high conversion efficiency in PNF.
关键词 ：
Hydrophobized Hydrophobized N-2 fixation N-2 fixation Photocatalysis Oxygen vacancy Photocatalysis Oxygen vacancy TiO2 TiO2
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| GB/T 7714 | Guan, Renquan , Wang, Dandan , Zhang, Yujun et al. Enhanced photocatalytic N-2 fixation via defective and fluoride modified TiO2 surface [J]. | APPLIED CATALYSIS B-ENVIRONMENTAL , 2021 , 282 . |
| MLA | Guan, Renquan et al. "Enhanced photocatalytic N-2 fixation via defective and fluoride modified TiO2 surface" . | APPLIED CATALYSIS B-ENVIRONMENTAL 282 (2021) . |
| APA | Guan, Renquan , Wang, Dandan , Zhang, Yujun , Liu, Chen , Xu, Wei , Wang, Jiaou et al. Enhanced photocatalytic N-2 fixation via defective and fluoride modified TiO2 surface . | APPLIED CATALYSIS B-ENVIRONMENTAL , 2021 , 282 . |
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摘要 ：
The nitrogen cycle plays an important role in nature, but N-containing products cannot meet human needs. The electrochemical synthesis of ammonia under ambient conditions has attracted the interest of many researchers because it provides a clean and pollution-free synthesis method; however, it has certain difficulties, including a high activation energy, multiple electron transfer, and hydrogenation. Thermodynamic factors limit the selectivity and activity of ammonia synthesis techniques. This review summarizes progress in the electrochemical synthesis of ammonia from theory and experiment. Theoretically, the reduction of nitrogen molecules is analyzed using orbit theory and the thermodynamic reaction pathways. Experimentally, we first discuss the effect of the experimental setup on the nitrogen reduction reaction, and then the four critical of catalysts, including size, electronic, coordination, and orientation effects. These issues must be considered to produce highly-efficient catalysts for electrochemical nitrogen reduction (eNRR). This review provides an overview of the eNRR to enable future researchers to design rational catalysts. © 2021 Science Press
关键词 ：
Activation energy Activation energy Ammonia Ammonia Coordination reactions Coordination reactions Electrocatalysts Electrocatalysts Electrolytic reduction Electrolytic reduction Nitrogen Nitrogen Nitrogen fixation Nitrogen fixation
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| GB/T 7714 | Niu, Lijuan , An, Li , Wang, Xiayan et al. Effect on electrochemical reduction of nitrogen to ammonia under ambient conditions: Challenges and opportunities for chemical fuels [J]. | Journal of Energy Chemistry , 2021 , 61 : 304-318 . |
| MLA | Niu, Lijuan et al. "Effect on electrochemical reduction of nitrogen to ammonia under ambient conditions: Challenges and opportunities for chemical fuels" . | Journal of Energy Chemistry 61 (2021) : 304-318 . |
| APA | Niu, Lijuan , An, Li , Wang, Xiayan , Sun, Zaicheng . Effect on electrochemical reduction of nitrogen to ammonia under ambient conditions: Challenges and opportunities for chemical fuels . | Journal of Energy Chemistry , 2021 , 61 , 304-318 . |
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摘要 ：
The common strategy for the design of photocatalytic materials is to load small-sized cocatalysts onto large-sized photocatalysts for efficient charge separation. In this study, a new design strategy is presented to anchor smallsized TiO2 photocatalysts onto large-sized Ti3C2-Mxene cocatalysts, which can provide enriched active sites to receive photo-generated electrons, thus achieving fast charge separation. Based on this strategy, the 4h-hydrogen production rate of the optimized photocatalytic system (62.5 mu mol) is 15.2 times higher than that of pure TiO2 (4.1 mu mol), strongly demonstrating the feasibility of our design strategy. The strategy here presents an effective way to design novel photocatalytic systems with superior photocatalytic properties.
关键词 ：
Photocatalytic water splitting Photocatalytic water splitting Design strategy Design strategy Large-sized cocatalyst Large-sized cocatalyst Ultra-small photocatalyst Ultra-small photocatalyst
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| GB/T 7714 | Li, Weiming , Zhuang, Chunqiang , Li, Yuanli et al. Anchoring ultra-small TiO2 & nbsp;quantum dots onto ultra-thin and large-sized Mxene nanosheets for highly efficient photocatalytic water splitting [J]. | CERAMICS INTERNATIONAL , 2021 , 47 (15) : 21769-21776 . |
| MLA | Li, Weiming et al. "Anchoring ultra-small TiO2 & nbsp;quantum dots onto ultra-thin and large-sized Mxene nanosheets for highly efficient photocatalytic water splitting" . | CERAMICS INTERNATIONAL 47 . 15 (2021) : 21769-21776 . |
| APA | Li, Weiming , Zhuang, Chunqiang , Li, Yuanli , Gao, Chunlang , Jiang, Wenshuai , Sun, Zaicheng et al. Anchoring ultra-small TiO2 & nbsp;quantum dots onto ultra-thin and large-sized Mxene nanosheets for highly efficient photocatalytic water splitting . | CERAMICS INTERNATIONAL , 2021 , 47 (15) , 21769-21776 . |
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