ACS Applied Energy Materials
·
2023
·
IF 6.4
Xi Li,Youping Guo,Yiran Li,Renchun Fu
Transition metal cobalt oxide (Co3O4) with a typical spinel structure is considered a promising electrocatalyst for oxygen evolution reaction (OER). However, its OER catalytic performance is unsatisfactory owing to its limited activity. In this study, we demonstrate that using graphitic carbon nitride (g-C3N4) loaded Co3O4 nanoparticles and then anchoring them onto 2D Ti3C2Tx MXene with a layered structure can significantly enhance the OER catalytic performance. This performance may be due to the well-layered structure of g-C3N4, thereby enabling it to provide more attachment sites for Co3O4 nanoparticles, reducing their agglomeration properties and exposing more active sites to promote OER catalytic performance. When anchoring Co3O4@g-C3N4 on Ti3C2Tx MXene, solid-state interfacial interactions can adjust the structure of electrons and promote the rate of interfacial charge transfer, which enhances the conductivity of the catalyst and further promotes its OER catalytic performance. The overpotential required for TCN is 247 mV at a current density of 10 mA cm–2, which is significantly lower than that of pure Ti3C2Tx MXene (600 mV) and Co3O4@g-C3N4 (387 mV), in addition to exhibiting excellent electrochemical stability.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wuwen Liu,Dongsheng Zhang,Huiyu Yue,Yajiao Li,Federico Rosei,Dong Liu,Ren Su
Heterogeneous photocatalysis is an ideal method for eco-friendly synthesis of value-added chemicals. However, due to the limited penetration depth of photons and inefficient utilization of the catalytic active sites, the scalability of heterogeneous photocatalysis is restrained. Combining heterogeneous photocatalysis and flow system is a promising solution to optimize the light absorption and mass transfer; however, an affordable, practical design of the flow system and the immobilization method of the photocatalyst is still missing. Here, we report a flow system for heterogeneous photocatalytic synthesis of azoxybenzene and its derivatives from reductive coupling of nitrobenzene at a gram-scale using anchored graphitic carbon nitride (gCN) on porous silica (gCN-SiO 2 ). The hydrogen bonds formed between the gCN and the tetramethoxysilane (TMOS) precursor during the dehydrative condensation process prevent unwanted leaching of catalyst, enabling photocatalytic flow synthesis of azoxybenzene with high selectivity, efficiency, and durability. Mechanistic studies reveals that the gCN-SiO 2 regulates the photocatalytic reduction kinetics of nitrobenzene by facilitating the generation of nitrosobenzene and N-phenylhydroxylamine intermediates while preventing the formation of unwanted 4-phenylazophenol byproducts, resulting in efficient and selective synthesis of azoxybenzene. Our work provides an alternative path towards large scale heterogeneous photocatalysis.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
Materials Today Sustainability
·
2024
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IF 7.1
Nannan Song,Yifan Suo,Feng Rong,Kai Wang,Yong Guo,Zhongwei Chen,Yuan Yu,Tingting Chen,Juncheng Jiang
Enhancing the fire safety of epoxy resin (EP) is crucial due to its widespread but inherent flammability , necessitating the integration of additive flame retardants (FRs) that are effective in small quantities and exhibit efficient flame retardancy. This study constructed a novel, efficient FR by synthesizing organic iron phosphate (ATMP-Fe) and loading it on graphitic carbon nitride (g-C 3 N 4 ). The resulting hybrid flame retardant (ATMP-Fe/g-C 3 N 4 ) was added to EP in minimal amount to bolster its flame retardancy and safety features. Incorporating a mere 3 wt% of ATMP-Fe/g-C 3 N 4 into EP significantly improved its flame retardancy and thermal stability. This was evidenced by an increase in the limiting oxygen index from 25.5% for EP to 30.1%, achieving a V-1 rating in the UL-94 test, and producing a 22.0 wt% char residue . Moreover, there was a substantial reduction in peak heat release rate , total heat release, and total smoke production by 36.3%, 27.5%, and 39.3%, respectively. The reduction in pyrolysis products, along with the formation of a dense and stable char layer facilitated by the synergistic effects of phosphorus and iron elements, significantly improved the fire safety of EP. Additionally, the enhanced hydrophobicity , mechanical properties, and electrical conductivity of the EP/3ATMP-Fe/g-C 3 N 4 composite suggested potential for wider application of EP in various fields.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 28
·13783-13790
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IF 3.925
Xiaohang Yang,Xinzhe Wang,Jiaming Yang,Xingbo Bian,Xueli Yu,Xuyang Huo,Qiuju Qi,Ruokun Jia
Porous graphitic carbon nitride with nitrogen vacancies (N–CN) has been successfully synthesized using a facile CaCO3 template method. The porous structure contributed to the increased surface area of the obtained N–CN photocatalyst. The formed N3C vacancies perturbed the localized electron distribution and tailored the electronic band structure, leading to an extended visible light response and the enhanced dissociation and transportation of photoexcited charge carriers. As a result, the as-prepared N–CN photocatalyst exhibited a 3.2-fold enhancement in the H2 evolution rate in comparison with a bulk CN photocatalyst, which was attributed to the modified architecture and the presence of N3C vacancies.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yang Chen,Wenlong Wang,WenBin Zhao,Jinting Xu,PengHui Shi,YuLin Min
The advantages of aqueous Zn-ion batteries lie in the affordability and environmental friendliness . Nonetheless, the use of aqueous Zn-ion batteries is severely hindered by key issues such dendrite formation and side reactions in Zn metal anodes. It is able to works well so as to create a stable interface layer, which controls the development of dendrites and adverse reactions. In this study, it is recommended that the coating formed by nano-semiconductor material graphitic carbon nitride (g-C 3 N 4 ) should be applied to the surface of Zn metal to evenly disperse the electric field, as well as inhibit the development of tip effect, thus preventing Zn dendrite growth. Zn deposition occurs quickly and steadily as a result of Zn 2+ ions being adsorbed and the Zn 2+ ion flow being reallocated by the zincophilicity of N atoms in the coating. The Zn symmetrical battery can be stable cycled for 1,000 h at a current density of 0.5 mA cm −2 , with its overall areal capacity of 0.5mAh cm −2 , which is attributed to these benefits of the coating. It can be stable circulated for 500 h at a high current density of 5 mA cm −2 , with its total areal capacity of 1mAh cm −2 . The completely constructed Zn-g-C 3 N 4 //V 2 O 5 according exhibits exceptional long-term cycle stability. Under the current density of 2 A/g, the initial capacity is 312.3 mAh g −1 , which can cycle be stable circulated for 1,000 cycles. Under the high current density of 5 A/g, the whole battery's capacity keeping holding rate is 70% after 2000 cycles, and the coulomb efficiency (CE) is extremely near to 100%.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Zhou Yisa,Wu Ying,Wu Haoyu,Xue Jian,Ding Li,Wang Rui,Wang Haihui
Two-dimensional graphitic carbon nitride (g-C 3 N 4 ) nanosheets are ideal candidates for membranes because of their intrinsic in-plane nanopores. However, non-selective defects formed by traditional top-down preparation and the unfavorable re-stacking hinder the application of these nanosheets in gas separation. Herein, we report lamellar g-C 3 N 4 nanosheets as gas separation membranes with a disordered layer-stacking structure based on high quality g-C 3 N 4 nanosheets through bottom-up synthesis. Thanks to fast and highly selective transport through the high-density sieving channels and the interlayer paths, the membranes, superior to state-of-the-art ones, exhibit high H 2 permeance of 1.3 × 10 −6 mol m −2 s −1 Pa −1 with excellent selectivity for multiple gas mixtures. Notably, these membranes show excellent stability under harsh practice-relevant environments, such as temperature swings, wet atmosphere and long-term operation of more than 200 days. Therefore, such lamellar membranes with high quality g-C 3 N 4 nanosheets hold great promise for gas separation applications.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
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2016
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IF 3.389
Yunfeng Zhu,Xiaoyan Li,Mingyuan Zhu
In this study, we present a simple but efficient photocatalyst of mesoporous graphitic carbon nitride (mpg-C 3 N 4 ) that can activate molecular O 2 to oxidize dibenzothiophene under visible light. The desulfurization rate of the simulated oil was 100% under optimal conditions at room temperature. Mpg-C 3 N 4 is characterized using transmission electron microscopy, nitrogen adsorption–desorption isotherm, and X-ray diffraction.
研究领域:
材料科学
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环境化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 37
·19875-19883
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IF 8.867
Xiang Gao,Yiming Li,Xiaolong Yang,Yanan Shang,Yong Wang,Baoyu Gao,Zhining Wang
Ultrathin graphitic carbon nitride (gCN) nanosheets, due to their two-dimensional graphene-like structure, regularly distributed triangular nanopores and structural defects on the laminar network, have attracted great research attention in fabricating high-performance water selective membranes. However, the poor dispersity of gCN limited its application in thin film nanocomposite (TFN) membranes. Here, we synthesized acidified graphitic carbon nitride (aCN) with smaller size and higher solubility. Both aCN and gCN were incorporated into a polyamide (PA) selective layer by interfacial polymerization. The aCN embedded TFN membrane (TFN-aCN) possessed supreme reverse osmosis (RO) performance among the prepared membranes. Compared with the reference TFC membrane, the TFN-aCN50 membrane exhibited a 79.3% increase in permeate flux accompanied by a quite high NaCl rejection of 98.6%. Moreover, the introduction of aCN and gCN generated a more hydrophilic and negatively charged membrane surface, and thus resulted in an improved antifouling performance.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Dongjing Liu,Cheng Lu,Jiang Wu
Graphitic carbon nitride (g-C3N4) as a 2D layered carbon material with exceptional electronic, thermal, and catalytic property has attracted increasing research attention. A porous g-C3N4 nanosheet (PCNN) has been synthesized via a facile two-step thermal etching oxidation approach and applied in low-temperature elemental mercury (Hg0) removal. PCNN exhibits good reactivity toward Hg0 adsorption at temperatures of 40–200 °C. CuO impregnation can prominently enhance the Hg0 capture performance of PCNN on account of the intimate interaction of CuO and PCNN. Temperature has a positive effect on Hg0 capture ability of PCNN and CuO/PCNN. Hg0 is mainly oxidized by the chemisorbed oxygen species that are generated from the O–C–N of g-C3N4 and the lattice oxygen of CuO. CuO modification can efficiently activate g-C3N4 with significantly improved Hg0 capture ability presumably owing to the Mott–Schottky effect at the interface of CuO and g-C3N4.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jianmei Pan,Yahai Zhang,Yi Guan,Yingnan Yan,Hua Tang,Xianglong Liu,Mengdi Wang,Xiangxin Wei
The development of hydrogen (H 2 ) production photocatalyst with low cost, non-precious metal and high-activity for commercial application is a long-term target and challenge. In this work, novel silicon carbide (SiC) nanofibers/graphitic carbon nitride (g-C 3 N 4 ) nanosheets (SiC/CNNS) decorated via multipurpose nickel (Ni) nanoparticles were prepared by an easy heat treatment followed by hydrothermal method. The tight Ni interface layers as cocatalyst and electron transfer mediator can significantly enhance the H 2 production property over SiC/CNNS nanoheterojunctions under light-emitting diode (LED) illumination. The optimal Ni/SiC/CNNS with a mass fraction of 10% Ni loading shows the most superior H 2 -generation rate of 6183 μmol g −1 h −1 , which is approximately 53, 3 and 227 times compared to CNNS, 10 %Ni/CNNS and SiC/CNNS, respectively. The metallic Ni nanoparticles play the leading and multifunctional roles in improving photocatalytic activity, including collecting the photo-generated electrons efficiently, transferring and separating the charge carriers rapidly, facilitating the H 2 -production kinetics and decreasing the overpotentials of surface reactions for H 2 -production. It is highly expected that the multipurpose and non-precious metal cocatalyst to form tight interface layers can supply a simple and universal strategy to design high-efficiency cocatalyst-semiconductor–semiconductor photocatalysts for H 2 production.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xiang Liang,Jianming Fan,Dong Liang,Yan Xu,Yuqi Zhi,Huiping Hu,Xiaoqing Qiu
In the study, we present a quick potassium hydroxide heat treatment approach to optimize the “melon” framework of graphite carbon nitride and modify the surface properties by functionalization of hydroxyl groups. The hydroxyl groups functionalized g-CN samples have been applied as bifunctional materials for efficient elimination of diquat dibromide herbicide through synergistic adsorption/photodegradation processes. The structural characterizations of the as-obtained samples, combined with the detailed diquat dibromide herbicide adsorption study, reveal that the surface hydroxyl groups are the active sites for the diquat dibromide adsorption, which account for the much enhanced saturation adsorption capacities of 159.3 mg g −1 at 25 °C and pH = 7 (more than 110 times improvement compared with pristine carbon nitride). Furthermore, the grafted surface hydroxyl groups and optimized planar structures endow the functionalized samples with the advantageous properties of efficient photoinduced charge transfer and separation, low interface resistance, and high photoresponse. Consequently, the deep mineralization of diquat dibromide herbicide was achieved over the bifunctional materials (total removal ratios were ~ 97.1% after 240 min visible-light irradiation). This work not only demonstrates the feasibility of hydroxyl groups functionalized graphite carbon nitride for elimination of herbicide pollutants but also offers new insights to better design efficient and durable materials for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Mengni Ge,Zhuohui Jia,Quanguo Jiang,Guobing Ying,Yan Yang,Shaoyu Wu,Takashi Goto,Jianfeng Zhang
The development of highly-permeable reverse osmosis membranes has yet been pursued as a basis for efficient water purification/desalination. In this study, graphitic carbon nitride (g-C 3 N 4 ) nanomaterials with three structures, including one-dimensional (1D) g-C 3 N 4 nanorods , two-dimensional (2D) g-C 3 N 4 nanosheets and one/two-dimensional (1D/2D) g-C 3 N 4 nanohybrids were dispersed into polyamide layer for preparation of thin-film nanocomposite (TFN) membranes. The effects of different structures of g-C 3 N 4 nanomaterials on the microstructure and performance of membranes were investigated. Compared with polyamide membrane, 1D/2D nanohybrids incorporated TFN membrane had more open and larger nodular structures with abundant water channels. The surface roughness was decreased, the negativity and hydrophilicity were improved. The water permeability of resultant TFN membrane increased to 3.63 L·m −2 ·h −1 ·bar −1 for 2000 ppm NaCl brackish solution, 3.4 times that of PA membrane, with a high rejection of about 99.0 %. Even for 32,000 ppm NaCl solution, almost the same as the concentration of seawater, the water permeability of TFN membrane still maintained at 1.73 L·m −2 ·h −1 ·bar −1 , 1.4 times that of PA membrane. Meanwhile, antifouling performance of membranes was systematically analyzed under organic foulant, inorganic foulant and mixed organic-inorganic foulants, which proved the excellent antifouling performance of resultant TFN membranes. In a word, the 1D/2D nanohybrids incorporated TFN membrane exhibited superior permeability and antifouling performance to 1D nanorods or 2D nanosheets incorporated ones, confirming the effectiveness of 1D/2D g-C 3 N 4 nanohybrids for modification of reverse osmosis membrane and promising for more applications.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）