CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Hongjing Wang,Wenxin Wang,Qiqi Mao,Hongjie Yu,Kai Deng,You Xu,Xiaonian Li,Ziqiang Wang,Liang Wang
Strain engineering is a prospective approach to enhance catalytic performance of electrocatalysts. Herein, we report a CO-confined growth method for the synthesis of tensile-strained PdNi bimetallene as bifunctional catalyst for hydrogen evolution reaction (HER) and formate oxidation reaction (FOR). Ascribed to electronic effect and strain effect derived from the introduction of Ni and ultrathin curved geometry, PdNi bimetallene possesses sufficient active sites and modulates the adsorption/dissociation of electrocatalytic intermediates, resulting in outstanding activity and stability for HER and FOR. In HER-FOR system, a low cell voltage of 0.51 V is achieved at 20 mA cm −2 by PdNi bimetallene, which is 1.21 V lower than that for the conventional water electrolysis. This work offers a versatile route for the synthesis of crimped bimetallene materials for advanced energy-efficient hydrogen production and beyond.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 31
·11323-11328
·
IF 8.067
Jianing Duan,Jun Xi,Bo Jiao,Jinfei Dai,Yanqing Zu,Zhaoxin Wu
Cesium copper halide perovskite-like nanocrystals (NCs) have emerged recently due to their nontoxicity and highly efficient and peculiar optoelectronic properties; however, this field is far from being quested yet. In this study, Cs5Cu3Cl6I2 NCs in a one-dimensional chain structure are proposed by a modified hot injection method for the first time. The as-synthesized highly even Cs5Cu3Cl6I2 NCs yield a blue emission at 464 nm, coupling a high photoluminescence quantum yield (PLQY) of 73.7%. The large Stokes shift of 186 nm and broadband emission demonstrate the existence of self-trapped excitons in Cs5Cu3Cl6I2 NCs under UV excitation. Unlike the zero-dimensional prototype, one-dimensional chains consist of different polyhedron connection fashions, fostering their unique luminescent properties. We found Cs5Cu3Cl6I2 NCs possess an asymmetric PL emission peak prevailing in a broad temperature range, highly correlating to abnormal multiple self-trapped excitons at 2.95 eV, 2.69 eV, and 2.53 eV, respectively. Interrogating the fundamental, triple Cu–Cu interactions originating from various polyhedral connection ways of one-dimensional chains are responsible for the hybrid excitonic states. This work establishes a rising class of lead-free NCs as an eligible candidate for stable functional device application and illustrates the fundamentals underlying the dissimilar excitonic properties of one-dimensional copper halides.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Longshi Rao,Qing Zhang,Bin Sun,Mingfu Wen,Jiayang Zhang,Shudong Yu,Ting Fu,Xiaodong Niu
Cesium lead halide perovskite crystals have attracted widespread attention due to their excellent photoelectric properties. However, their intrinsic instability and the photoluminescence quantum yield (PLQY) sharply dropped in the solid-state limit their practical applications. Besides, the current synthesis strategies either need a variety of ligands, or an anti-solvent, which will result in potential environmental risks. Herein, we address the above issues simultaneously by embedding CsPbBr 3 in a large bandgap Cs 4 PbBr 6 matrix by high-speed mechanical mixing without using any ligands and highly toxic anti-solvent. Changing the molar ratio of PbBr 2 /CsBr, centrifugation time, and the solution concentration, the optimized CsPbBr 3 /Cs 4 PbBr 6 show a high PLQY of up to 79%. In addition, mechanistic studies show that the origin of green luminesce of CsPbBr 3 /Cs 4 PbBr 6 microcrystals is closely related to the CsPbBr 3 inclusion theory, but not to the Br vacancy theory, in which CsPbBr 3 embedded in Cs 4 PbBr 6 to form a CsPbBr 3 /Cs 4 PbBr 6 heterostructure . By taking advantage of the heterostructure, the photostability and thermostability of CsPbBr 3 /Cs 4 PbBr 6 are significantly enhanced. In addition, the high optical and temperature/humidity-stable performances of CsPbBr 3 /Cs 4 PbBr 6 are verified by applying them to white LEDs (WLEDs). The electroluminescence intensity of WLEDs remains 70% of the original one after being stored in a chamber with high temperature and high humidity (85 °C/RH 85%) for 40 h, and the device displays luminous efficiency of 74.5 lm/W at 20 mA. This result provides a solid foundation for their scale applications in lighting, displays, and other optoelectronic and photonic devices.
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Bioactive Materials
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2022
·
IF 16.874
Puxiang Zhao,Yue Feng,Youquan Zhou,Cuiying Tan,Mingxian Liu
Infection and healing of wounds after injury has always been an unavoidable problem in daily life, so design of a biomaterial with antibacterial and good wound healing properties is highly needed. Herein, a wound healing hydrogel dressing with halloysite clay and chitin as the main components was prepared, which combines the advantages of the biomacromolecule and clay. Halloysite nanotubes (HNTs) are extremely biocompatible clay materials with a hollow tubular structure, and the inner and outer surfaces of HNTs are composed of SiOx and AlOx layers with different charges. Au nanoparticles with diameter in 5–10 nm were filled into the HNTs' lumen to endow photothermal effect of the clay materials. [email protected] was then mixed with chitin solution to prepare flexible composite hydrogel by crosslinking by epichlorohydrin. The antibacterial properties, biocompatibility and hemostatic properties of the hydrogel material were investigated by antibacterial experiments, cell experiments, mouse liver and tail hemostatic experiments. After infecting the back wound of mice with Staphylococcus aureus, the hydrogel was applied to the wound to further verify the killing effect on bacteria and wound healing effect of the hydrogel material in vivo. The [email protected] composite hydrogel exhibits high antibacterial and hemostatic activity as well as promoting wound healing function with low cytotoxicity. This study is significant for the development of high-performance wound dressings based on two commonly used biocompatible materials, which shows promising application in wound sterilization and healing.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 12
·2026
·
IF 5.719
Weizhuo Zhang,Xin Li,Chencheng Peng,Fei Yang,Linyuan Lian,Runda Guo,Jianbing Zhang,Lei Wang
Colloidal cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite nanocrystals (NCs) demonstrate supreme optical properties in the spectra region of infrared, red, and green. High-performance blue-emitting counterparts are still eagerly required for next-generation full-color displays. However, it is challenging to obtain efficient blue perovskite NCs, especially in a deep blue region with an emission wavelength of around 460 nm or shorter. Herein, calcium halide and ammonium ions are applied simultaneously to modify the CsPb(Br/Cl)3NCs in situ to reduce surface defects, finally remarkably enhancing the photoluminescence quantum yield (PLQY) from 13% to 93% with an emission peak at 455 nm and the Commission Internationale de l’Eclairage (CIE) coordinates at (0.147, 0.030), which is close to the requirement of the Rec.2020 standard and also meets the requirement of blue emission in DCI-P3. Bright white emission and a wide color gamut are also achieved by combining the commercial red-emitting and green-emitting phosphors. The combination of time-resolved PL spectra and femtosecond transient absorption results discloses the reason for PLQY improvement as suppressing the nonradiative recombination.Keywords:CsPb(Br/Cl)3nanocrystals;surface passivation;blue emission;ammonium ion;calcium
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hongyuan Li,Bowen Zhang,Bo Zhang,Hari Bala,Xiangli An,Nian Sha,Zeyu Sun,Wei Zhang,Zhanying Zhang
All-inorganic perovskite materials have attracted much attention in the field of photocatalysts due to their unique photoelectric properties.However, the inherent poor stability of perovskite quantum dots significantlyhinders their practical applications. Herein, to settle the instabilities of inorganic perovskite materials, Sn-TiO 2 coated CsPbBr 3 quantum dots named CsPbBr 3 /Sn-TiO 2 , are fabricated via resaturated recrystallization, sol–gel coating and solvothermal crystallization.The XRD results demonstrated that the core–shell structure of CsPbBr 3 /Sn-TiO 2 nanocrystals was successfully synthesized.Moreover, excellent dispersion is verified for CsPbBr 3 /Sn-TiO 2 nanocrystals with a core–shell structure by TEM. The particle size of CsPbBr 3 /Sn-TiO 2 nanocrystals is 15–30 nm, where the core size for CsPbBr 3 quantum dots is 4–8 nm, and the Sn-TiO 2 shell thickness is 2–8 nm.The photocatalytic activity of nanocomposites was studied by the photodegradation of RhB aqueous solution under the irradiation of 100 mWcm −2 air mass 1.5 global AM1.5G sunlight. Compared with traditional photocatalyst P25, the core–shell structured CsPbBr 3 /Sn-TiO 2 nanocrystals exhibited better photocatalytic performance, with a degradation efficiency of 96.6% and a degradation rate constant of 10.68 × 10 -2 min −1 in 30 min of catalytic time, which was five times higher than that of P25.The core–shell structured CsPbBr 3 /Sn-TiO 2 nanocrystals have long-term stability in water system and have potential practical application value in the field of environmental governance.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hongwu Tian,Leizi Jiao,Kun Wang,Xiande Zhao,Fengjing Cao,Daming Dong
Smartphone have been applied to develop various sensors. However, because of the limitations of the Si detectors used in smartphone cameras, they can only detect visible light, which greatly restricts their functions for advanced sensor development. Herein, we extended the detection range of smartphone cameras to ultraviolet (UV) region by using perovskite quantum dots (QDs), which have excellent down-converting properties. We realized two smartphone-based environmental sensors. (1) A solar UV radiation sensor in which the perovskite QDs convert UV light to visible light that is detected by the smartphone camera. Coupled with app , this ingenious sensor can detect the solar UV index and also visualize the UV-radiation distribution. (2) A water chemical oxygen demand sensor that based on UV absorption. The sensor was realized by adding a simple attachment to the front of the smartphone camera. It can be used as an in-pocket sensor to measure water quality anytime and anywhere.
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JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Yan Lei,Ruijuan Qi,Jinpeng Wu,Haodan Guo,Xiangrong Li,Yanyan Fang,Dongmei Xie,Yuan Lin
The III-V group colloidal quantum dots (CQDs) have been successfully synthesized with stable and low-cost chemical reagents recently, but they are rarely used for solid state solar cells due to the poor charge carrier transfer in solid films. In this work, the surface of InZnP (Zn doped InP) CQDs has been reconstructed with PbS via a chemical engineering strategy. Comparing with InZnP CQDs, the long carbon chain ligands capped on the InZnP@PbS CQDs surface can be easily exchanged with small molecules. By capping the mercaptopropionic acid (MPA) onto the InZnP@PbS CQDs surface, the electrical coupling between the InZnP@PbS CQDs has been established, and the photoinduced charge carrier transfer has been significantly enhanced. Based on the above CQDs, solid state solar cell devices are assembled, achieving about 1.5% of power conversion efficiency (PCE). The photoelectric performances of the fabricated solar cells almost do not decay after 150 days storage. Current work may provide a new way for III-V group CQDs application in solution-processed optoelectronics .
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ANALYTICAL CHEMISTRY
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2022
·
IF 8.008
Jing Lei,Wei Liu,Yan Jin,Baoxin Li
Defect engineering is an effective strategy to improve the catalytic activity of metal oxides, and quantitative characterization of surface defects is thus vital to the understanding and application of metal oxide catalysts. Herein, we found that ZnO nanoparticles with oxygen vacancy could trigger the luminol–H2O2 system to emit a strong chemiluminescence (CL), and the CL intensity was strongly dependent on the oxygen vacancy of the ZnO nanoparticles. The mechanism of this CL reaction was discussed by means of the electron-spin resonance spectrum, X-ray photoelectron spectrum (XPS), and CL spectrum. The oxygen vacancy-dependent CL was attributed to the ability of the oxygen vacancy to readily adsorb and further dissociate H2O2 into active •OH radicals. Taking advantage of this oxygen vacancy-dependent CL, we presented one method for quantifying the oxygen defects in ZnO. Compared with the current evaluation techniques (XPS and Raman spectroscopy), this CL method is rapid, low-cost, and easy to operate. This work introduces the CL technique into the field of material structure–property evaluation, and provides a new approach for exploring the defect function in ZnO defect engineering.
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高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200793
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IF 9.14
Yanmei Guo,Jinxi Chen,Yixin Zhao,Yongbing Lou
Graphical Greener approach to toluene oxidation : Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite quantum dots (QDs) are anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing surface passivation and suppressing optical decay. Additionally, the novel composites as photocatalysts are used to drive the oxidation of toluene and demonstrate astonishing conversion rates with high selectivity. All-inorganic metal halide perovskite quantum dots (QDs) have attracted attention from researchers with their fascinating optoelectronic properties. However, blue-emitting perovskite QDs typically have low photoluminescence quantum yield (PLQY). For potential commercial applications, it is preferable to replace Pb with an element having low toxicity. Here, Pb-free Cs 3 Bi 2 Br 9 @BiOBr perovskite QDs were anchored on the surface of NH x -rich monodisperse silica (A−SiO 2 ) via N−Bi chemical bonding to isolate QDs from each other, thus enhancing efficient surface passivation and suppressing optical decay. Compared to unanchored QDs, Cs 3 Bi 2 Br 9 @BiOBr QDs/A−SiO 2 composites exhibited significantly enhanced blue emission performance, the PLQY of which increased from 16.62 % to 77.26 %, in addition to good water and environmental stability. Finally, the novel composites as photocatalysts were used to drive the oxidation of toluene, a template reaction of C(sp 3 )−H bond activation and demonstrated astonishing conversion rates (4317 μmol g −1 h −1 ) with high selectivity (around 87 %).
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Advanced Science
·
2022
·Vol. 9
·期 22
·2202123
·
IF 17.521
Ying Li,Jiahui Wang,Qing Yang,Guozhen Shen
Optoelectronic synapses combining optical-sensing and synaptic functions are playing an increasingly vital role in the neuromorphic computing systems development, which can efficiently process visual information and complex recognition, memory, and learning. Metal halides are considered promising candidates for synaptic devices due to their excellent optoelectronic properties. However, the toxicity of lead and the further development of device functions are the recognized problems at present. Herein, a flexible optoelectronic synapses system based on high-quality lead-free Cs 3 Bi 2 I 9 nanocrystals is demonstrated, in which the carrier confinement caused by the band mismatching between the Cs 3 Bi 2 I 9 and the organic semiconductor layer provides the possibility to simulate synaptic behaviors. The synaptic functions including long/short-term memory and learning-forgetting-relearning are demonstrated in this device and visual perception, visual memory, and color recognition functions are successfully implemented. Additionally, the flexible device exhibits excellent robustness and can realize imaging of light distribution under curved hemispheres similar to the human eye. Finally, through the simulation based on an artificial neural network algorithm, the device successfully realizes the high-precision recognition of handwritten digital images and possesses a strong fault tolerant capability even in bending states. These results are expected to drive the practical progress of metal halide for neuromorphic computing.
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CRYSTENGCOMM
·
2022
·Vol. 24
·期 38
·6777-6785
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IF 3.756
Ling Li,Hao Dong,Yongfei Hu,Tao Zeng,Yunxia Chen,Kwadwo Mensah-Darkwa,Emmanuel Tsiwah Acheampong,Ghafar Ali,Yi Xie
Although lead halide perovskite (LHP) nanocrystals (NCs) are considered propitious materials due to their extraordinary optoelectronic properties, the scalability of synthesis and poor ambient stability hinder their commercial applications. Herein, we develop a facile and universal room-temperature (RT) protocol for the synthesis of red-emitting all-inorganic CsPbBr3−xIx perovskite NCs by the mediation of capping ligands. The emission wavelength can be tuned in the range of 598–651 nm by tailoring the PbBr2 : PbI2 precursor ratios and the amounts of ligands. Interestingly, the introduction of ligands such as 3-mercaptopropionic acid (MPA) and thioglycolic acid (TGA) heavily improves the stability of the as-synthesized NCs against water, heat stress and UV irradiation, which is due to surface passivation. This work offers a reliable and scalable reference for tuning red-emissive perovskite NCs with improved environmental stability, which will accelerate their commercial application process in optoelectronic fields.
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