Journal of Energy Chemistry
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2020
·
IF 7.216
Jin-Feng Liao,Ya-Ting Cai,Jun-Yan Li,Yong Jiang,Xu-Dong Wang,Hong-Yan Chen,Dai-Bin Kuang
The optoelectronic performance of CsPbBr 3 nanocrystal (NC) has been dramatically limited by the severe charge carrier recombination and its narrow light absorption range, which are anticipated to be resolved via coupling with plasmonic Au nanoparticle (NP). In view of this, CsPbBr 3 –Au nanocomposite is fabricated and further employed as a concept model to study the electronic interaction between perovskite NC and Au NP for the first time. It has been found that the excitation-wavelength dependent carrier transfer behavior exists in CsPbBr 3 –Au nanocomposite. Upon illumination with visible light ( λ >420 nm), photo-generated electrons in CsPbBr 3 can inject into Au with an electron injection rate and efficiency of 2.84 × 10 9 s −1 and 78%, respectively. The boosted charge separation is further translated into a 3.2-fold enhancement in CO 2 photocatalytic reduction activity compared with pristine CsPbBr 3 . On the other hand, when solely exciting Au NP with longer wavelength light ( λ >580 nm), the localized surface plasmon resonance (LSPR) induced hot electrons in Au NPs can transfer to CsPbBr 3 NC and further participate in photocatalytic reaction towards CO 2 reduction. The present study provides new insights into preparing plasmonic nanostructure to enhance the performance of perovskite based optoelectronic devices.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2018
·
IF 4.513
Guang Zhao,Xuepeng Wu,Rizhong Luan,Shaikh Azizullah,Haiming Fan,Caili Dai
A novel CO 2 responsive anionic smart wormlike micelles (SWLMs) was constructed by simply mixing sodium oleate (NaOA) and the small organic counterion 2, 6, 10-trimethyl-2, 6, 10-triazaundecane (TMTAD) in a 3:1 M ratio without complex organic synthesis. After bubbling CO 2 , TMTAD and NaOA molecules in aqueous solution, a pseudo Gemini surfactant is formed in situ due to electrostatic interactions. This system shows two obvious performance transitions when CO 2 is continuously introduced, from a water-like solution to a viscoelastic fluid and then a milky solution. Such transitions reflect the continuous transformation of the self-assembled structure from spherical micelles to wormlike micelles and then vesicle or spherical micelles. Additionally, this system can exhibit two similar sequential transformations when the pH changes in the reverse process.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Shuhui Wang,Jiawei Zhan,Kui Chen,Asad Ali,Linghui Zeng,He Zhao,Wanglai Hu,Lixin Zhu,Xiaoliang Xu
The visible-light-driven CO2 reduction efficiency is largely restrained by the negative photoabsorption and high recombination rate of electron–hole pairs. It is an effective method to increase the efficiency of CO2 photoreduction by doping alkali metal elements to engineer the electronic properties of the catalyst. Here, we report a new study on the potassium-doped g-C3N4 (K-CN) being used for CO2 reduction irradiated by visible light. DFT calculations and XPS tests show that the potassium doping is interlayer doping, changing the electronic structure of g-C3N4. The higher ID/IG value indicates more structural distortion and defects caused by K doping. K-CNs have enhanced visible-light absorption, and PL spectra demonstrate that the introduction of potassium advances the separation and transmission of photoexcited charge carriers, further confirmed by transient photocurrent response experiment. Under visible light, K-CN-7 achieved efficient CO2 reduction without any noble metal as a cocatalyst, with CO formation rates of 8.7 μmol g–1 h–1, which is 25 times that of ordinary g-C3N4. Our work further validates the importance of inhibiting e–/h+ recombination in improving solar energy conversion efficiency while also bringing hope for efficient solar fuel production using g-C3N4.
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STAR Protocols
·
2023
·
IF 0
Shuchao Jiang,Jikai Sun,Guoqing Ren,Weiqiao Deng
Summary CO 2 capture and utilization into liquid fuels and high-added-value chemicals has been regarded as an attractive strategy to mitigate excessive carbon emissions. Here, we present a protocol to capture and convert CO 2 into pure formic acid (HCOOH) solution and solid fertilizer (NH 4 H 2 PO 4 ). We describe steps for synthesis of an IRMOF3-derived carbon-supported PdAu heterogeneous catalyst (PdAu/CN-NH 2 ), which can efficiently catalyze (NH 4 ) 2 CO 3 -captured CO 2 into formate under ambient conditions. For complete details on the use and execution of this protocol, please refer to Jiang et al. (2023). 1
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PubMed
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 15
·期 4
·882-891
·
IF 3.552
Fan Yiyi,Li Jinyong,Wang Saidi,Meng Xiuxia,Jin Yun,Yang Naitao,Meng Bo,Li Jiaquan,Liu Shaomin
Hydrogen fuel has been embraced as a potential long-term solution to the growing demand for clean energy. A membrane-assisted separation is promising in producing high-purity H 2 . Molecular sieving membranes (MSMs) are endowed with high gas selectivity and permeability because their well-defined micropores can facilitate molecular exclusion, diffusion, and adsorption. In this work, MXene nanosheets intercalated with Ni 2+ were assembled to form an MSM supported on Al 2 O 3 hollow fiber via a vacuum-assisted filtration and drying process. The prepared membranes showed excellent H 2 /CO 2 mixture separation performance at room temperature. Separation factor reached 615 with a hydrogen permeance of 8.35 × 10 −8 mol·m −2 ·s −1 ·Pa −1 . Compared with the original Ti 3 C 2 T x /Al 2 O 3 hollow fiber membranes, the permeation of hydrogen through the Ni 2+ -Ti 3 C 2 T x /Al 2 O 3 membrane was considerably increased, stemming from the strong interaction between the negatively charged MXene nanosheets and Ni 2+ . The interlayer spacing of MSMs was tuned by Ni 2+ . During 200-hour testing, the resultant membrane maintained an excellent gas separation without any substantial performance decline. Our results indicate that the Ni 2+ tailored Ti 3 C 2 T x /Al 2 O 3 hollow fiber membranes can inspire promising industrial applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Zhiliang Wu,Wei Li,Linlin Hou,Qiuming Wei,Huixing Yang,Yangyang Jiang,Dingyuan Tang
Metal-organic framework (MOF) and covalent organic framework (COF) hybrid materials have drawn much research attention in the field of photocatalysis due to their complementary advantages, massive specific area, customizable structure and performance, and suitable band gap. Herein, the MOF@COF hybrid platform with a novel sunflower-like strong π-π bond stacking was formed by introducing the preformed synthetic COF into the MOF precursor solution and modulating its morphology by vacuum thermal-assisted growth. More importantly, the synthesized MOF on the COF hybrid platform with multiple active centers exhibits excellent catalytic activity in the sacrificial agent-free photocatalytic CO 2 reduction reaction under simulated sunlight. Additionally, the maximum CH 4 yieldrate of the synthesized PCN-222-Cu@TpPa-1 (1:2) reached 21.27 μmol g -1 h -1 , with an AQY (apparent quantum yield) about 10.46 % (in pure water system, λ = 550 nm) and a methane selectivity of about 27.25 %. The best performance of PCN-222-Cu@TpPa-1 is approximately 4.3 times higher than that of pure PCN-222-Cu and 100 times higher than that of the reported NH 2 -MIL-125(Ti) NMB. The selectivity of the products CO and CH 4 can be improved by adjusting the ratio of MOF and COF. Finally, the goal of providing an optimal photocatalytic platform for increased photocatalytic CO 2 reduction with highly effective morphology-tunable MOF@COF was expanded upon by a potential photocatalytic reaction mechanism, which was suggested based on the analysis of experimental results.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 16
·11595-11606
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IF 2.993
Wu Keliang,Dong Xuejun,Zhu Junfang,Wu Pengcheng,Liu Chang,Wang Yixi,Wu Jianning,Hou Juan,Liu Zhiyong,Guo Xuhong
The nanostructured heterojunction photocatalysts are considered promising in photocatalytic reduction in the carbon dioxide. Herein, we demonstrate a simple sol–gel and hydrolysis process to design nanostructured TiO 2 /ZnO heterojunction, by using the biological template celery stalk. The nanostructured photocatalyst consists of anatase TiO 2 and wurtzite ZnO nanoparticles. A well-connected heterojunction, with uniformly distributed nanoparticles, on the pores and folds of celery stems, is obtained. The enhanced specific surface area of 55.5 m 2 /g is achieved. The crystal structure, morphology and surface composition are investigated by electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Furthermore, we demonstrate the photocatalytic performance of as-synthesized nanostructure TiO 2 /ZnO heterojunction. The photocatalytic yield, of CO 2 reduction into CH 4 , exhibits a five times increase, from 0.55 to 2.56 µmol h −1 g −1 , for the nanocomposite as compared to the pure TiO 2 . This enhanced performance corresponds to the efficient charge transfer and hindrance in the recombination of electron–hole pairs due to the optimum band positions of ZnO and TiO 2 . This study demonstrates the potential of using biotemplates to design efficient photocatalysts to convert CO 2 into useful solar fuels.
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高影响因子
Catalysis Science & Technology
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2016
·Vol. 6
·期 22
·7967-7975
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IF 5.287
Jie Zhao,Yun Wang,Yingxuan Li,Xiu Yue,Chuanyi Wang
CeO2 is a basic promoter for CO2 photoreduction with H2O over TiO2-based catalysts, but there is still a lack of insight into the interaction of CeO2 with different TiO2 polymorphs and its effect on CO2 photoreduction. In this study, pure anatase, brookite, and rutile TiO2 and their respective hybrids with CeO2 were prepared, and their structural properties, optical properties, interfacial interaction and activity for CO2 photoreduction were systematically studied. The addition of CeO2 improved the activity for CO2 photoreduction under simulated sunlight irradiation, but the improvement depends on the phases of the TiO2. X-ray diffraction, macro-Raman spectroscopic and electron paramagnetic resonance measurements confirm the presence of Ti defects at the CeO2–rutile interfaces, implying a relatively strong interaction between CeO2 and rutile, which is beneficial for the interfacial separation of photogenerated charge carriers. As a result, CeO2/rutile shows the best enhancement of CO2 photoreduction among the studied CeO2/TiO2 systems. Moreover, different paramagnetic species were detected in the three TiO2 polymorphs. The O− radical anion in the anatase lattice could be oxidized to produce Ti3+ under UV-light irradiation, whereas the O2− radical anion on the surface of brookite TiO2 might retard CO production.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
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IF 2.587
Hua Cheng,Ping Wang,Jiangshui Luo,Jan Fransaer,Dirk E. De Vos,Zheng-Hong Luo
To search for robust CO2 capture materials, two types of ionic liquids, namely, (p-vinylbenzyl)trimethylammonium tetrafluoroborate ([VBTMA][BF4]) and (p-vinylbenzyl)trimethylammonium hexafluorophosphate ([VBTMA][PF6]), were synthesized and immobilized onto a mesoporous silica (meso-silica) support by the surface-initiated atom-transfer radical polymerization (SI-ATRP) method. The prepared sorbents meso-SiO2–P[VBTMA][BF4] and meso-SiO2–P[VBTMA][PF6] were well-characterized. Their adsorption behaviors toward CO2 from simulated flue gases at different pressures were investigated using an adsorption column. Based on a simulated flue gas containing 10 vol % CO2 at 30 °C, the highest CO2 adsorption capacity of meso-SiO2–P[VBTMA][BF4] was 0.4025 mmol g–1, whereas the corresponding value for meso-SiO2–P[VBTMA][PF6] was 0.3793 mmol g–1. Compared with pure poly(ionic liquid)s, the existence of a meso-silica core improves the CO2 capture capacity. Furthermore, the presence of vapor can improve the CO2 capture capacity. However, an increase in temperature inhibits the CO2 capture capacity, implying that the nanocomposites should preferably be used at low temperature.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 17
·4369-4375
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IF 7.779
Xuyang Chen,Meiyu Cong,Ming Tang,Jinxuan Liu,Shaoyun Chen,Yan Gao
A bimetallic ZnCo-porphyrin metal–organic framework (ZnCo-BMOF) nanosheet was developed for efficient photoreduction of CO2 to CO. The ZnCo-BMOF nanosheet comprises photosensitizers (Zn porphyrin) and catalysts (Co porphyrin) providing a molecular platform to enable fast electron transfer from photosensitizers (PSs) to atomically dispersed catalytic Co sites. Under visible light illumination, the ZnCo-BMOF nanosheet can efficiently reduce CO2 to CO with a yield of 778 μmol g−1 in 6 h, which is 2.8-fold higher than those of its counterparts (Zn-MOF/Co-MOF = physically mixed Zn-MOF and Co-MOF), owing to the improvement of charge transfer capacity and longer lifetime of the photogenerated electron–hole pairs. Density functional theory calculation results reveal that atomically dispersed cobalt sites serve as efficient active sites, which favors accepting electrons from the Zn porphyrin.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Hanqing Lin,Ke Gong,Petr Hykys,Danke Chen,Wen Ying,Zdenek Sofer,Youguo Yan,Zhen Li,Xinsheng Peng
CO 2 separation and recovery technology is a significant part of resolving the global greenhouse issue. In order to develop a cost-effective and high-performance method to realize CO 2 separation, a new kind of supported liquid membrane was configured by incorporating deep eutectic solvent into the nanoslits of titanium carbide (Ti 3 C 2 T x ) membrane. The deep eutectic solvent is a novel ionic liquid analogous with equal physical and chemical advantages but more economical and environmental benign. And the Ti 3 C 2 T x , as a neoteric two-dimension material, can serve as a valid platform for supporting the deep eutectic absorbent. By combining the two kinds of material, the resultant Ti 3 C 2 T x supported deep eutectic liquid membrane shows good CO 2 preference against other light gases as well as high thermal stability and long-term durability. The permeance of CO 2 is about 26.35 GPU with selectivity over N 2 , CH 4 and H 2 are 319.15, 249.01 and 12.38, respectively. The molecule dynamic simulation is also applied to uncover the separation mechanism of CO 2 and the ingredient redistribution and interionic refactor phenomenon of deep eutectic solvent trapped in the Ti 3 C 2 T x nanoslits.
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高影响因子
Green Chemical Engineering
·
2020
·
IF 0
Weifang Zhu,Fu Liu,Minmin Gou,Ruili Guo,Xueqin Li
The two-dimensional (2D) nanosheet zinc cobaltate (ZnCo 2 O 4 ) was added into polyether block amide (Pebax) matrix to prepare mixing matrix membrane (MMM) for separating carbon dioxide (CO 2 )/methane (CH 4 ) gas mixture. The 2D porous ZnCo 2 O 4 nanosheets were composed of chemically interconnected metal oxide nanoparticles. The ZnCo 2 O 4 nanoparticles in the nanosheets constructed large-quantity pores of 11.78 nm and provided abundant transfer channels for gas molecule. Moreover, the synergistic effect of bimetallic Zn 2+ and Co 2+ would promote the generation of oxygen vacancies (O δ− ), which could provide more CO 2 (C δ+ ) adsorption sites, thereby increased the selectivity of the membrane. The large aspect ratio of the ultra-thin ZnCo 2 O 4 nanosheets showed better dispersion in the membrane. The pure gas separation performance data showed the CO 2 permeability and CO 2 /CH 4 selectivity of Pebax/ZnCo 2 O 4 membrane were 139.10 Barrer and 15.38, respectively, when the filling amount was 0.5 wt%. Compared with pure Pebax membrane, the separation performance (permeability and selectivity) were increased with 165.67% and 75.57%, respectively.
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