Nano Research
·
2022
·Vol. 16
·期 6
·8405-8410
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IF 10.269
Cao Renfei,Cui Yangfeng,Huang Gang,Liu Wanqiang,Liu Jianwei,Zhang Xinbo
Li-O 2 batteries with extremely high specific energy density have been regarded as a kind of promising successor to current Li-ion batteries. However, the high charge overpotential for the decomposition of Li 2 O 2 discharge product reduces the energy efficiency and triggers a series of side reactions that cause the Li-O 2 batteries to have a limited lifetime. Herein, Co-doped C 3 N 4 (Co-C 3 N 4 ) photocatalysts were designed by an in situ thermal evaporation method to take advantage of the photo-assisted charging technology to conquer the shortcomings of Li-O 2 batteries encountered in the charge process. Different from the commonly used photocatalysts, the Co-C 3 N 4 photocatalysts perform well no matter with and without illumination, owing to the Co doping induced conductivity and electrocatalytic ability enhancement. This makes the Co-C 3 N 4 reduce the charge and discharge overpotentials and improve the cycling performance of Li-O 2 batteries (from 20 to 106 cycles) without illumination. While introducing illumination, the performance can be further improved: Charge voltage reduces to 3.3 V, and the energy efficiency increases to 84.84%, indicating that the Co-C 3 N 4 could behave as a suitable photocathode for Li-O 2 batteries. Besides, the low charge voltage and the continuous illumination together weaken the corrosion of the Li anode, making the long-term high-efficiency operation of Li-O 2 batteries no longer just extravagant hope.
研究领域:
材料科学
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电化学
·
能源技术
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DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Linxing Shi,Haoyang Yuan,Yuanyuan Zhang,Xianggang Sun,Liangsheng Duan,Qile Li,Zengguang Huang,Xinxin Ban,DongEn Zhang
g-C3N4-assisted interface engineering has been developed as an effective method to improve the efficiency and stability of perovskite solar cells (PSCs). However, most of the reported works used g-C3N4-induced single-interface modification, which is difficult to passivate the bilateral interfaces of the perovskite layer at the same time. In this paper, we fabricated two kinds of C3N4 materials simultaneously (w-CN and y-CN) after the twice calcination of melamine and used them in the bilateral interface modification toward all-inorganic PSCs. The two kinds of C3N4 play different roles in different interface engineering. On the front interface, w-CN could optimize band level arrangement and improve the perovskite film quality, which contributes to the efficiency of the device. On the back interface, y-CN could also improve the film quality of the perovskite layer, accelerating the extraction of charge carriers. The champion efficiency of the CsPbIBr2-based device treated by the bilateral interface is significantly enhanced from 7.8 to 10.1%. Moreover, the modified perovskite film exhibits negligible degradation after 40 min of exposure in the ambient environment with a relative humidity of 70%, while the pristine perovskite film has a rapid degradation within 20 min.
研究领域:
材料科学
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能源科学
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光伏技术
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xixian Huang,Nengwu Zhu,Fulin Mao,Yang Ding,Sihai Zhang,Fei Li,Huangrui Liu,Pingxiao Wu
Tailoring economical g-C 3 N 4 -based composites with efficient visible-light photocatalytic degradation ability have received great attention. In this study, a novel and efficient visible-light photocatalyst, Au nanoparticles doped porous carbon modified g-C 3 N 4 (Au@C/g-C 3 N 4 ), was synthesized using thermal polycondensation method. The crystal, morphological and photoelectrical characterizations verified the successful synthesis of Au@C/g-C 3 N 4 hybrid and it had larger specific area and narrower band gap than that of pure g-C 3 N 4 . The optimal Rhodamine B (RhB) photocatalytic oxidation performance (94.3%) and mineralization rate (50.7%) were obtained by Au@C/g-C 3 N 4 -2 composite at 1.0 g L −1 catalyst dosage and pH of 5.0, which was 3.23 and 2.96 times, respectively than that of g-C 3 N 4 at the same conditions. Au@C/g-C 3 N 4 -2 also maintained satisfactory RhB degradation efficiency (70.7%) after 4 consecutive photocatalytic cycles. Mechanism analyses indicated that the significantly improved photocatalytic activity of Au@C/g-C 3 N 4 composite mainly attributed to the rapid separation and migration of charge carriers via the interfacial interaction between the Au@C and g-C 3 N 4 , which resulted in the accelerated O 2 − generation for organic pollutants oxidation. In general, this study supplied a novel strategy for efficient g-C 3 N 4 visible-light photocatalysts construction, and further clarified its plausible visible-light photocatalytic mechanism.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaosong Zhou,Xiaoxing Yu,Lanzhen Peng,Jin Luo,Xiaomei Ning,Xuliang Fan,Xunfu Zhou,Xiaoqin Zhou
The photocatalytic H 2 production activity of polymer carbon nitride (g-C 3 N 4 ) is limited by the rapid recombination of photoelectron-hole pairs and slow surface reduction dynamic process. Here, a supramolecular complex (named R-TAP-Pd(II)) was fabricated via self-assembly of (R)-N-(1-phenylethyl)-4-(4-(pyridin-2-yl)-1H-1,2,3-triazol-1-yl)benzamide (R-TAP) with Pd(II) and used to modify g-C 3 N 4 . In the R-TAP-Pd(II)@g-C 3 N 4 composite photocatalyst, the spin polarization of R-TAP-Pd(II) can promote charge transfer and inhibit photogenerated carrier recombination, as confirmed by spectral tests and photoelectrochemical performance tests. Electrochemical tests and in situ X-ray photoelectron spectroscopy (XPS) tests proved that the Pd(II) ion in the R-TAP-Pd(II) molecule can serve as active sites to accelerate H 2 production. The R-TAP-Pd(II)@g-C 3 N 4 presented a photocatalytic H 2 generation rate of 1085 μmol g −1 h −1 when exposed to visible light, which was a about 278-fold increase compared with g-C 3 N 4 . This work finds a new approach to boost the photocatalytic efficiency of g-C 3 N 4 via supramolecular self-assembly.
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 19
·195605
·
IF 2.9
Shuo Wang,Haotian Yin,Lei Wang,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic reduction of carbon dioxide is a technology that effectively utilizes CO2 and solar energy. Sodium niobate (NaNbO3) has received much attention in the field of photocatalysis due to its excellent photocatalytic properties. However, the application of NaNbO3 in the field of photocatalysis is still limited by poor reaction to visible light and easy recombination of photo-generated carriers. Heterojunction with g-C3N4 to construct core–shell structure can effectively improve the above problems. Combining the two can design a core–shell composite material that is beneficial for photocatalytic reduction of CO2. Herein, we prepared a core–shell heterojunction g-C3N4/NaNbO3 by uniformly impregnating urea on the surface of NaNbO3 chromium nanofibers with NaNbO3 nanofibers prepared by electrospinning as a catalyst carrier, and urea as a precursor of g-C3N4. The core–shell structure of g-C3N4/NaNbO3 was verified by a series of characterization methods such as XPS, XRD, and TEM. It was found that under the same conditions, the methanol yield of core–shell g-C3N4/NaNbO3 was 12.86 μmol·g−1·h−1, which is twice that of pure NaNbO3 (6.67 μmol·g−1·h−1). This article highlights an impregnation method to build core–shell structures for improved photocatalytic reduction of CO2.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Changwang Yan,Jing Zou,Li He,Wanhui Jin,Qian Yu,Jing Yu,Zhong Zhao,Guangming Cai,Deshan Cheng,Xin Wang
Inorganic photocatalysts with excellent photocatalytic reactivity have significant potential for wastewater treatment . In this study, using sodium copper chlorophyllin (SCC) as a copper source, Cu atoms were incorporated into the center cavities of g-C 3 N 4 nanosheets by hydrothermal-calcination combined processes. Cu atoms doping led to a narrower optic band gap and the dramatic improvement in photocurrent response as well as corresponding declines in the intensity of electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) spectra. Consequently, the photocatalytic property the Cu/g-C 3 N 4 was enhanced dramatically as evidenced by a 53.4% increase in the photocatalytic degradation rate of tetracycline . Superoxide ions and hydroxyl radicals were found to be the main reactive oxygen species (ROS) causing the degradation. The increased photocatalytic capability of Cu/g-C 3 N 4 might be attributed to the increased chance of intersystem crossing in photosensitizing process of Cu/g-C 3 N 4 as well as the lowered adsorption energy required for the adsorption of O 2 to the catalyst. Minor decline in the photocatalytic efficiency of Cu/g-C 3 N 4 was observed while the crystal structure of the Cu/g-C 3 N 4 remained stable after three cycles of tetracycline degradation. These results indicated the good stability of Cu/g-C 3 N 4 and the possibility of recycling the catalyst during the photocatalytic applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Jing Fan,Liang Guo,Fenhong Song
This study employed the hydrothermal method to dope Mn into Sn 3 O 4 , which was then combined with g-C 3 N 4 through calcination to prepare an II-type Mn-Sn 3 O 4 -x/CN composite photocatalyst. The impact of Mn-Sn 3 O 4 loading on the photocatalytic performance was discussed. The synthesized composite catalysts exhibited remarkable hydrogen production performance under visible light, with Mn-Sn 3 O 4 -10/CN demonstrating the highest performance. Characterization techniques confirmed the successful preparation of the catalysts, and the light absorption capacity, charge separation and transport efficiency of Mn-Sn 3 O 4 -10/CN are significantly improved compared to catalysts with other ratios. This study developed a Mn-Sn 3 O 4 -x/CN composite catalyst with high stability and good hydrogen production rate. It provides further directions for the research of g-C 3 N 4 -based composite catalysts.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Ye Liu,Lei Zhang,Yubo Kuang,Xiaoqian Xiang,Haohan Tao,Guangran Di,Xiaojing Yin,Meicheng Li,Xiao-Jun Lv
The photocatalytic CO 2 reduction has the problems of low selectivity of single product. Here, the preparation of Cu modified tubular C 3 N 4 (CTN) was studied. The increase of the active site inhibits the recombination of electrons (e-) and holes (h + ) and improves the selectivity of CO 2 reduction products. Finally, the CO and CH 4 yields of 1.5 % CTN photocatalyst are 11.55 μmol·g −1 and 4.72 μmol·g −1 , respectively, which are 5 times higher than that of tubular C 3 N 4 photocatalyst. The selectivity of 2 % CTN to CH 4 is up to 68 %, indicating that the prepared CTN photocatalyst has high CO 2 reduction activity and CH 4 selectivity.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Miao-Miao Fang,Jun-Xia Shao,Xiang-Gang Huang,Jin-Yi Wang,Wei Chen
A direct Z-scheme CdFe 2 O 4 /g-C 3 N 4 hybrid systems with different weight ratios of CdFe 2 O 4 nanoparticles were successfully designed and constructed for ceftiofur sodium photodegradation. The as-obtained CdFe 2 O 4 /g-C 3 N 4 hybrid samples composed of CdFe 2 O 4 nanoparticles and g-C 3 N 4 nanosheets were systematically characterized by different techniques including X-ray diffraction, scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, UV–vis DRS , chemical oxygen demand, inductively coupled plasma mass spectrometer, photochemical test and electron spin resonance spectrometer technique. The optimal photocatalytic activity for ceftiofur sodium photodegradation was achieved by modulating the weight ration between CdFe 2 O 4 nanoparticles and g-C 3 N 4 nanosheets. The result from photocatalytic tests indicate that CdFe 2 O 4 /g-C 3 N 4 -2 hybrid sample exhibit highly efficient photocatalytic activity towards ceftiofur sodium removal in comparison with pristine CdFe 2 O 4 nanoparticles and pure g-C 3 N 4 nanosheets. Meanwhile the excellent photocatalytic stability of CdFe 2 O 4 /g-C 3 N 4 -2 hybrid sample was also verified during recycling runs towards photocatalytic ceftiofur sodium degradation. The significant enhancement of photocatalytic activity was attributed to the Z-scheme charge separation and transfer based on the construction of tight heterogeneous interface and well-matched band potentials. We expect this research to provide a new insight into the design and preparation of direct Z-scheme hybrid photocatalysts for environmental remediation.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Jianmei Pan,Wei Shen,Yahai Zhang,Hua Tang,Haoyu Sun,Wenqiang Zhong,Xuehua Yan
Photocatalytic water splitting to product hydrogen (H 2 ) is a desired route to utilize solar energy into chemical energy. At present, most photocatalysts for H 2 generation contains metallic elements with high-cost, confined reserves, and environmentally unfriendly. The exploitation of metal-free and efficient photocatalysts becomes particularly important. Herein, a new metal-free g-C 3 N 4 -based heterojunction composites were facilely produced via the ultrasonic assisted deposition and subsequent calcination from g-C 3 N 4 layers embedded with SiOC with prominent conductivity and large surface area. Systematic investigates suggested that the SiOC/g-C 3 N 4 heterojunctions exhibited eminently meliorated photocatalytic H 2 production efficiency. The optimum H 2 production rate (1020 μmol h −1 g −1 ) of the SiOC/g-C 3 N 4 photocatalyst is 3.2 and 25.5 folds that of g-C 3 N 4 and SiOC , respectively. The boosted photocatalytic activity primarily originates from the increased absorptivity of light, the markedly expedited charge migration and the impeded recombination of charge carriers. This study offers a new perspective for the scientific contrive and fabrication of high-quality heterojunction photocatalysts for solar energy utilization.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Yongke Zhang,Zhiliang Jin
g-C3N4@ZIF-67 composite photocatalyst-supported NiSx are successfully prepared by a hydrothermal method using g-C3N4 and ZIF-67 as carriers. The synthesized composite catalyst has an efficient photocatalytic H2 production effect. Under visible light irradiation, the maximum H2 production within 5 h over the [g-C3N4@ZIF-67/(10%wt)NiSx] photocatalyst is 208 μmol, which is 8.32 times higher than that of pure g-C3N4. Based on the analysis of scanning electron microscopy and transmission electron microscopy, it is not only known that g-C3N4 and ZIF-67 provide space for the loading of NiSx nanoparticles but also that ZIF-67 as a carrier framework can effectively reduce the particle size of NiSx nanoparticles and increase the dispersion of NiSx. Further studies of photoluminescence (PL), time-resolved PL, i–t, linear scanning voltammetry, electrochemical impedance spectroscopy, and Mott–Schottky curves, we can not only know that the modification of NiSx nanoparticles do enhance the electron transfer ability but also that the matched conduction band position between g-C3N4 and ZIF-67 provides a feasible thermodynamic path for the transmission of electrons. Based on the DFT calculations, both NiS2 and Ni3S4 show the metallic characteristics, which means the outstanding electrical conductivity of them and implies the excellent capability to transport electrons. The work function of NiSx with metallic properties is more negative than that of the semiconductor, which indicates that the loading of NiSx can further promote the separation of electrons, thereby improving the H2 production efficiency.
研究领域:
材料科学
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能源化学
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催化科学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 49
·30503-30509
·
IF 3.361
Xiupei Yang,Lin Zhang,Dan Wang,Qian Zhang,Jie Zeng,Run Zhang
Developing a new photocatalyst for fast and highly efficient organic dye degradation plays an essential role in wastewater treatment. In this study, a photocatalyst graphite phase carbon nitride (g-C3N4) containing nitrogen defects (CN) is reported for the degradation of rhodamine B (RhB). The porous g-C3N4 photocatalyst is facilely synthesized through a polycondensation method and then characterized by X-ray diffraction (XRD), infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), N2 isotherm adsorption line, and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the g-C3N4 is evaluated through the degradation of RhB under visible light irradiation. The results show that photocatalytic activity of the nitrogen-defective g-C3N4 can be improved by optimizating washing conditions, including washing temperature, washing dosage, drying time, and drying temperature. With the prepared nitrogen-defective g-C3N4, decolourization of RhB is able to be completed within 20 minutes, in which the degradation rate is 1.7 times higher than that of bulk g-C3N4. Moreover, the nitrogen-defective g-C3N4 has high stability and reusability in the degradation of RhB. Photocatalytic degradation mechanism investigations by ultraviolet-visible absorption spectroscopy, radical trapping experiments and high-performance liquid chromatography (HPLC) reveal that RhB achieved complete mineralization through the photocatalytic degradation reaction mediated by superoxide radicals (˙O2−). This work thus provides a new approach for the preparation of photocatalysts for organic pollutants treatment in wastewater samples.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）