CARBON
·
2023
·
IF 10.9
Ci Lin,Xiaolong Zhao,Yejun Xiao,Shahid Sattar,Lei Tang,Adeela Nairan,Yu Guo,Mingyu Xia,Carlo Maria Canali,Usman Khan,Dennis Y.C. Leung
Enabling highly efficient photocatalytic hydrogen production from solar-driven water splitting is of immense potential and environmental significance. However, the crucial issue of the low utilization efficiency of photogenerated charges in most photocatalysts , such as polymeric graphitic carbon nitride , g-C 3 N 4 (CN), hampers the overall photocatalytic activity and hinders practical applications. To surmount this parasitic phenomenon, we develop a heterojunction-based strategy that improves the charge separation efficiency in CN. The heterostructure is constructed between thermally exfoliated CN and liquid phase exfoliated Bi 2 O 2 Se (BOS) via a solution-phase, electrostatically driven self-assembly process. The properly aligned band positions between the two components create a built-in electric field, which endows the composite with an enhanced charge separation efficiency. The optimized Pt-deposited heterostructure photocatalyst exhibits a hydrogen production rate of 6481 μmol h −1 g −1 , and an apparent quantum efficiency of 11.65% at 420 nm, compared to those of Pt-deposited ECN (4595 μmol h −1 g −1 , 6.64 %). We validate the efficient charge separation effect and the prolonged lifetime of photogenerated carriers in the heterostructure using a series of comprehensive characterizations across multiple timescales, thus, elucidating the origin of the observed photocatalytic activity. This demonstration offers valuable insights into improving the utilization efficiency of photogenerated charges for photocatalysis by heterostructure engineering with materials of distinct electronic configurations.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Ruixin Song,Shifei Kang,Liangtao Yao,Lulu Zheng,Dechao Yu,Dawei Zhang
BiVO4 has been widely used in the field of photocatalysis due to its nontoxic and moderate band gap. However, single BiVO4 has the disadvantages of a high recombination rate of photogenerated carriers and weak response to visible light, inhibiting its photocatalytic applications. To explore viable solutions, a hybrid material composed of lanthanum-doped bismuth vanadate (La-BiVO4) and oxygen-doped porous graphite carbon nitride (O-doped g-C3N4), i.e., La-BiVO4/O-doped g-C3N4 powder, was prepared by a facile hydrothermal reaction and low-temperature calcination. Then, the powder was loaded on polyacrylonitrile nanofibers (NFs) through the electrospinning fiber technique. Various surface science characterizations, including transmission electron microscopy and nitrogen absorption and desorption analysis, confirmed the successful synthesis of a mesoporous heterojunction material. The La3+-doping as well as the porous morphologies and larger specific surface area of the O-doped g-C3N4 ultimately improve the photocatalytic abilities via a proposed Z-scheme heterojunction mechanism. The roles of La3+-doping and morphology modification in promoting the separation of the photogenerated carriers and broadening the optical absorption range were experimentally discussed. The RhB degradation experiment indicated that the La-BiVO4/O-doped g-C3N4 powder has excellent photocatalytic activity, which is about 2.85 and 2 times higher than that of the pure BiVO4 and O-doped g-C3N4, respectively. Meanwhile, the La-BiVO4/O-doped g-C3N4 NF shows good stability and recoverability after a 10-cycle testing. Such a hybrid photocatalyst with a proposed Z-scheme heterojunction mechanism and good plasticity might pave a feasible way to fabricate a new library of photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 4
·1471-1487
·
IF 2.914
Zheng Wei,Feng Sheng,Feng Shanshan,Shao Cong,Jiang Zhenfei,Wu Wei,Ge Yunjie,Liao Shenyu,Li Kunjie,Duan Chunying,Meng Qi
In this work, a ternary complex (g-C 3 N 4 /ZIF-8/AgBr) was prepared by modifying the surface of the protonated graphitic carbon nitride (g-C 3 N 4 ) with photosensitive AgBr and zeolitic imidazolate framework-8 (ZIF-8), and its physicochemical parameters, crystal morphology and electrochemical properties were characterized using a series of techniques. The modified g-C 3 N 4 not only improves the ability to capture pollutants in water, but also efficiently catalyzes the degradation of bisphenol A (BPA) in water by rapidly producing superoxide radicals ( · O 2 − ), cavitation (h + ) and hydroxyl radicals ( · OH) in visible light, with the removal efficiency reaching 80.4%. The activity of catalytic degradation of BPA from strong to weak is g-C 3 N 4 /ZIF-8/AgBr, g-C 3 N 4 /AgBr, g-C 3 N 4 /ZIF-8, AgBr, g-C 3 N 4 , ZIF-8. After four cycles of experiments, it was found that g-C 3 N 4 /ZIF-8/AgBr had still considerable degradation ability (70.2%) and stability.
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
Analytical Methods
·
2021
·Vol. 13
·期 7
·903-909
·
IF 2.896
Yiming Liu,Yanan Sun,Minli Yang
A new kind of convenient, low-cost double-potential ratiometric ECL sensing platform for the quantification of Cu2+ was developed with carbon nitride nanosheets (g-C3N4 NSs) and graphene quantum dots (GQDs) as ECL luminophores. g-C3N4 NSs mixed with multi-walled carbon nanotubes (MWCNTs) was immobilized on a glass carbon electrode (GCE) and produced strong cathodic ECL at a potential of −1.2 V (vs. Ag/AgCl), while GQDs in the solution gave anodic ECL at +2.5 V. MWCNTs were used here to amplify the ECL signal of g-C3N4 NSs. The addition of Cu2+ causes the cathodic ECL signal from g-C3N4 to decline, while the anodic ECL signal from GQDs remains unchanged. With the anodic ECL signal as an internal reference, a double-potential ratiometric ECL sensing platform for Cu2+ was established. The ratio of the cathodic signal intensity to anodic signal intensity showed a linear response to the Cu2+ concentration over a range from 5.0 × 10−10 to 1.0 × 10−6 mol L−1 and the detection limit was 0.37 nmol L−1 (3σ/S). Such a construction strategy alleviates the interference from the environment and therefore improves the detection accuracy of Cu2+. Compared with other methods for Cu2+ detection, this method is simpler and more sensitive.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Ruibin Liang,Yongquan Du,Junxi Wu,Xintong Li,Tongxin Liang,Jian Yuan,Peng Xiao,Jianwen Chen
In this work, g-C 3 N 4 @NiMoO 4 /CoMoO 4 (gCN@NCM) was fabricated by a hydrothermal method . g-C 3 N 4 sheets were embedded in staggered NiMoO 4 /CoMoO 4 rods to form a three-dimensional structure. The prepared gCN@NCM exhibited good electrochemical performance of high specific capacitance (641.5 F/g) and excellent cycle stability (15.79% of capacitance lost after 8000 cycles). The specific capacitance of the gCN@NCM//active carbon (AC) device got 30% enhanced at the first 2000 cycles. Moreover, 110% of the original specific capacitance was still maintained after 10,000 cycles. These results indicate that the g-C 3 N 4 @NiMoO 4 /CoMoO 4 has great potential in supercapacitors .
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 20
·16077-16098
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IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
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
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
·
IF 4.3
Jing-Xiao Li,Yu-Long Xie,Shang-Mei Yang
Bimetallic AgCo/g-C 3 N 4 photocatalysts were successfully prepared by a facile chemical reduction method and used to investigate their photocatalytic H 2 production performance. Bimetallic AgCo as a cocatalyst can be well matched with g-C 3 N 4 , which is beneficial for increasing the number of active reaction sites and narrowing the band gap. A possible photocatalytic mechanism was explored by XRD , FTIR, SEM, TEM, UV–vis DRS , BET, and PL characterization. The photocatalytic H 2 production activity of the optimal 5%AgCo/g-C 3 N 4 photocatalyst reached 12994.2 μmoL/g, which was 54.7 times higher than g-C 3 N 4 . Owing to the close interfacial contact between bimetallic AgCo and g-C 3 N 4 , the transfer distance was shortened, and the photogenerated electron and hole pairs were effectively separated. This study provides a new strategy for the synthesis of excellent H 2 production photocatalysts using bimetallic nanoparticles .
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 21
·1900775
·
IF 7.125
Qianyi Guo,Minchen Wei,Zekun Zheng,Xiongjian Huang,Xiaoqian Song,Shao-Bin Qiu,Xiao-bao Yang,Xiaofeng Liu,Jianrong Qiu,Guoping Dong
Polymeric g-C 3 N 4 with controllable photoluminescence emission wavelength in the whole visible light range (450–650 nm) is synthesized through the one-step molecular doping during the thermal condensation process of g-C 3 N 4 conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero-molecules, the modified g-C 3 N 4 with the optical properties controlled according to the demand of practical applications can be facilely and largely obtained. It overcomes the limitation of the narrow adjusting range of conventional g-C 3 N 4 on optical properties and makes it become more promising for applications in solid-state displays. The corresponding multiple-color g-C 3 N 4 -based LED devices and the white-light LEDs with high quality can be obtained as supported by experiments and theoretical calculations. Moreover, the effect of doped molecule on the π-conjugated system of g-C 3 N 4 is systematically studied here, and the tunable luminescence mechanism is proposed.
研究领域:
材料科学
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光学工程
·
化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yisa Zhou,Ya Zhang,Jian Xue,Rui Wang,Zongjie Yin,Li Ding,Haihui Wang
Highly permeable and selective membranes are desirable for energy-efficient gas separation. Two-dimensional graphitic carbon nitride (g-C 3 N 4 ) has attracted significant attention owing to its suitable pore size, high pore density, and thus minimal mass-transfer barrier. Nevertheless, it is difficult to retain the structural integrity of its two-dimensional plane during the delamination of bulky g-C 3 N 4 into nanosheets, which has greatly hindered the preparation of high-quality g-C 3 N 4 gas separation membranes. In this study, flexible graphene oxide (GO) nanosheets containing abundant functional groups were used to cover and remedy some defects in g-C 3 N 4 nanosheets. Consequently, a continuous g-C 3 N 4 -GO membrane was obtained that exhibited excellent H 2 permeation performance (H 2 permeance: 2.16 × 10 −7 mol m −2 s −1 Pa −1 , H 2 /CO 2 selectivity: 39.2) and good stability, which is promising for practical hydrogen separation processes.
研究领域:
材料科学
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能源工程
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化学工程
✓ 已验证
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 10
·1-11
·
IF 2.127
Liu Dongjing,Lu Cheng,Wu Jiang
Graphitic carbon nitride (g-C 3 N 4 ) with unique and versatile properties has gained increasing research concerns. Here, CuO/g-C 3 N 4 nanocomposite is fabricated and employed for gas-phase mercury (Hg 0 ) removal at low temperature. Pure g-C 3 N 4 performs well toward Hg 0 adsorption at 40–200 °C with the optimal Hg 0 removal efficiency of ~ 54.5% at 120 °C. CuO-modification can significantly promote the Hg 0 capture ability of g-C 3 N 4 , probably due to the intimate interface contact of CuO and g-C 3 N 4 . The Hg 0 removal efficiency of g-C 3 N 4 first increases and then decreases with rising temperature, while temperature shows a promotional effect on Hg 0 removal efficiency of CuO/g-C 3 N 4 . Hg 0 is oxidized into HgO by the chemisorbed oxygen originated from the O–C–N structure of g-C 3 N 4 and the lattice oxygen of CuO. g-C 3 N 4 can be efficiently activated by modifying with CuO toward enhanced Hg 0 oxidation ability, presumably attributed to the electron transfer at the interface of CuO and g-C 3 N 4 .
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Muhammad Asim,Alibek Kurbanov,Bushra Maryam,Muhammad Ajmal,Chenxiang Shi,Lun Pan,Ji-Jun Zou
Incorporating g-C 3 N 4 with transition metal phosphides is emerging as a low-cost and robust co-catalyst for hydrogen evolution . The ammonia borane hydrolysis is an efficient method to release H 2 at ambient conditions in the presence of a catalyst. An efficient and cheap catalyst is needed for practical application to achieve this benchmark. For this purpose, a catalyst Ni 2 P/C 3 N 4 is synthesized by hydrothermal method and low-temperature phosphidation. The optimization reveals that the Ni 2 P/C 3 N 4 with 6.5% Ni contents shows the best performance for H 2 release. Furthermore, 2% Pt nanoparticles loading over Ni 2 P/C 3 N 4 boosts the charge transfer and improves activity 5.7-fold compared to Ni 2 P/C 3 N 4 , and the Pt-loaded catalyst is depicted as Pt@Ni 2 P/C 3 N 4 . The reaction kinetics reveals that the hydrogen evolution rate accelerates by increasing the amount of Pt@Ni 2 P/C 3 N 4 and AB concentration, and the loading of Pt nanoparticles loaded over Ni 2 P/C 3 N 4 reduces the activation energy significantly. Moreover, the ionic interaction between Pt and Ni 2 P/C 3 N 4 generates Ptᵟ + and (Ni 2 P/C 3 N 4 )ᵟ − active sites which facilitates B–H cleavage and O–H bonds of ammonia borane and water, respectively. Incorporating transition metals phosphide and noble metals supported over g-C 3 N 4 paves the pathway toward the efficient H 2 evolution from ammonia borane, bringing cost-effective modifications to synthesize constructive catalysts.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 34
·28263-28269
·
IF 3.289
Xiumin Ma,Quantong Jiang,Weimin Guo,Meng Zheng,Weichen Xu,Fubin Ma,Baorong Hou
In this study, a sandwich-structured C3N4/Au/CdZnS photocatalyst with Au nanoparticles sandwiched between C3N4 and CdZnS was fabricated. The results showed that there was a 6.3 mmol g−1 increase of hydrogen production for C3N4/Au/CdZnS photocatalyst compared to C3N4/CdZnS in 4 h. The photoinduced I–t curve, electrochemical impedance spectrum (EIS), photogenerated electron lifetime and photoluminescence spectra showed that the photocatalytic ability of the composite was enhanced by anchoring Au as the electron transfer mediator between C3N4 and CdZnS through the Z-scheme charge-carrier transfer mechanism. Au functioned as an electron transition mediator, which could induce a combination between photogenerated electrons and holes in the CdZnS and C3N4, respectively. These photogenerated holes of CdZnS can be involved in the S2−/SO32− oxidation process and the electrons from the C3N4 surface might be involved in the water to hydrogen reduction reaction, thus enhancing the photocatalysis performance of C3N4/Au/CdZnS photocatalyst.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）