FUEL
·
2022
·
IF 8.035
Xiaodong Wang,Xiaoran Li,Sen Liu,Haofei Zhou,Qiuye Li,Jianjun Yang
Cis-9-Octadecenylamine modified α-Fe 2 O 3 and Fe(OH) 3 nanoparticles were successfully synthesized by using a one-step synthetic method. XRD results revealed that lower ratio of oleylamine to Fe 3+ introduce forming hematite phase but higher ratio introduce forming Fe(OH) 3 phase. FTIR, TGA, contact angle, and XPS results indicated that olelyamine were modified on the surface of α-Fe 2 O 3 or Fe(OH) 3 . A larger amount of oleylamine modifier is conducive to the dispersion of the catalysts in heavy oil. Oleylamine modified Fe(OH) 3 can be transformed into α-Fe 2 O 3 in situ during the catalytic reaction and shows higher catalytic activity in the viscosity reduction of Shengli extra heavy crude oil.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhipeng Zhang,Bingzhe Wang,Hai-Bing Zhao,Jin-Feng Liao,Zi-Chun Zhou,Tanghao Liu,Bingchen He,Qi Wei,Shi Chen,Hong-Yan Chen,Dai-Bin Kuang,Ying Li,Guichuan Xing
Lead-free double perovskites with superior stability have been considered as promising non-toxic substitutes to their lead-contained counterparts in photocatalysis . However, the severe charge recombination greatly restricts their potential as high-performance photocatalysts. Herein, for the first time, we present a self-assembled heterostructure of lead-free double perovskite Cs 2 AgBiBr 6 nanocrystals (NCs) on the surface of MXene nanosheets via mutual electrostatic attraction. The presence of MXene nanosheets effectively promotes the formation of free charge carriers in Cs 2 AgBiBr 6 NCs via reducing the exciton binding energy. Additionally, the ultrafast photogenerated electron transfer from Cs 2 AgBiBr 6 to MXene with a timescale of 1.1 ps largely prolongs the charge carrier lifetime by two times. As a result of the efficient charge separation and electron extraction, the Cs 2 AgBiBr 6 /MXene heterostructures achieve a high photoelectron consumption yield of 50.6 µmol g −1 h −1 for photocatalytic CO 2 reduction, which surpasses most previously reported lead-free perovskite-based catalysts.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Cheng Chen,Tongtong Xuan,Yang Yang,Fan Huang,Tianliang Zhou,Le Wang,Rong-Jun Xie
Perovskite light-emitting diodes (PeLEDs) are promising candidates used for superthin emissive displays with high resolution, high brightness, and wide color gamut, but the CsPbI3 nanocrystal (NC) based ones usually have an external quantum efficiency (EQE) of less than 20%, which needs further enhancement to minimize the gap between their counterparts. Herein, we propose to improve optical properties of the CsPbI3:Sr emissive layer (EML) by inserting an additional potassium iodide (KI) passivation layer between the hole transport layer and EML to increase the film quality, photoluminescence quantum yield, and thermal stability of the EML. The KI layer can also increase the carrier mobility to balance the charge injection in PeLEDs, leading to a reduction in Auger recombination and Joule heating. An interesting deep-red-emitting PeLED (λem = 687 nm) with a record EQE of 21.8% and a lifetime T50 of 69 min is obtained by applying the additional KI passivation layer. Moreover, a flexible PeLED consisting of the KI layer is also demonstrated to have a record EQE of 12.7%. These results indicate that the use of a functional KI layer is a feasible way to develop high-performance electroluminescent devices.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8122-8130
·
IF 3.925
Fangfang Chang,Yongpeng Liu,Lin Yang,Qing Zhang,Juncai Wei,Xiaolei Wang,Zhengyu Bai
The ability to improve the intrinsic activity of nanoalloy electrocatalysts is essential for designing highly efficient electrocatalysts by optimizing the basic physical properties of the nanoalloy. This report describes that the electrocatalytic performance of ultrathin PtnCo100−n alloy nanowires (PtnCo100−n NWs) toward the oxygen reduction reaction (ORR) is enhanced by regulating the lattice strain, highly active facets, and the electronic structure of the alloy, which can be achieved by optimizing the ratio of platinum-to-cobalt in alloys. The catalyst of PtnCo100−n nanoalloy NWs features subtle lattice strain and (111) facets. The electrochemical results show excellent activity and durability toward ORR at a Pt : Co ratio of ∼70 : 30, which suggests compressively-strained single-phase alloy state revealed by X-ray diffraction (XRD) results. The correlation of facets, lattice strain, electronic structure, and activity is evaluated by the theoretical model based on the density functional theory (DFT) calculations of nanoalloy clusters, which show electron transfer from the PtCo alloy to oxygen. There is a relatively low energy difference between the HOMO of the PtCo nanoalloy and the LUMO of oxygen as the Pt : Co atom ratio is 70 : 30. By analyzing the adsorption of OH, O, and OOH intermediates on the surface of PtCo(111) facets of different compositions, it is observed that the adsorption energy of the Pt2Co8 cluster (Pt : Co20 : 80) is the strongest, resulting in low activity. Interestingly, the adsorption energy of the Pt7Co3 cluster is between that of the Pt6Co4 and Pt10 cluster, which is thought to be related to the highest catalytic activity of the nanoalloy when the Pt : Co atom ratio is ∼70 : 30. This finding will provide a new strategy for studying the relationship between the structure and the catalytic activity of nanocatalysts.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 9
·2865-2871
·
IF 6.177
Wenkai Ji,Zaixiang Xu,Shijie Zhang,Yang Li,Zhikang Bao,Zijiang Zhao,Liang Xie,Xing Zhong,Zhongzhe Wei,Jianguo Wang
Photocatalytic production of hydrogen peroxide (H2O2) has received great attention as a promising route for sustainable solar fuel. In this work, we demonstrate that quantum dots (QDs) can be explored as a useful photocatalyst for high-efficiency photocatalytic production of H2O2 under visible-light with a record-high concentration of 126 mmol L−1. By band structure and wavefunction engineering, QDs exhibit an enhanced stability in an oxidized and humid environment. An oil/water two-phase system is designed to realize spontaneous separation of the H2O2 formed to the aqueous phase and of the organic by-products formed to the oil phase. By electron paramagnetic resonance (EPR) measurements, ˙O2− radicals are generated from QDs in the oil phase and transferred to the water phase immediately. The results in this work show that QDs with a rational surface and structure design can serve as an outstanding photocatalyst for the production of H2O2 under visible-light.
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高影响因子
Nanoscale
·
2022
·Vol. 14
·期 17
·6392-6401
·
IF 8.307
Zhaoyan Yang,Yuhui Dong,Shenfei Zong,Lang Li,Kuo Yang,Zhuyuan Wang,Haibo Zeng,Yiping Cui
Single-molecule localization microscopy (SMLM) is one of the most promising super-resolution imaging techniques for visualizing ultrasmall cellular structures. Here, water-dispersed perovskite CsPbBr3 nanocrystals (CsPbBr3 NCs) fabricated by a one-step mechanochemical method are explored as a SMLM fluorophore for bioimaging. Due to their ultrahigh photoluminescence quantum yield (PLQY), inherent frequent fluorescence blinking, proper duty cycle and long-term photostability, an extremely high location precision of ∼3 nm was achieved, a sixfold enhancement than those reported previously. In addition, the spatial resolution of a SMLM image depends on the size of CsPbBr3 NCs, which is approximately 23 nm. Two closely spaced CsPbBr3 NCs with a gap of 40 nm can be clearly distinguished in the SMLM image. More importantly, unlike most perovskite quantum dots (QDs), one-step mechanochemically prepared CsPbBr3 NCs can retain their excellent fluorescence characteristics even after surface biofunctionalization, greatly reducing the current limitations of perovskite QDs on bioimaging. As an example, cell-derived exosomes (30–150 nm in diameter) labeled with CsPbBr3 NCs were easily identified by SMLM. In addition, after being functionalized with biotin, targeted SMLM imaging of the nuclear lamina or cell membranes of cells was achieved with an enhanced resolution. This work may open up a promising avenue to expand the field of perovskite QD-based SMLM to bioimaging with a high location accuracy.
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高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Gongguo Zhang,Yingying Wang,Yanyun Ma,Yiqun Zheng,Haifeng Zhang,Mingyu Tang,Yunqian Dai
We report the fabrication of PdSm bimetallic nanocrystals with controlled shapes and explore their applications as the electrocatalysts for electroxidation of ethanol (EOR) in alkaline medium. The success of current synthesis relies on the co-reduction of Pd(acac) 2 and Sm(acac) 3 in the presence of N-oleyl-1,3-propanediamine (OPDA) and Mo(CO) 6 at an elevated temperature. For the first time, ultrathin nanostructures composed of Pd-rare earth metal bimetals could be prepared in high purity, in the form of ultrathin porous nanosheets and concave tetrahedra, together with the size/edge length limited to sub-3 nm size range. When serving as electrocatalysts for EOR, the carbon-supported PdSm nanocrystals exhibited in seven-fold increase in mass activity as compared to that of Pt/C, as well as improved reaction kinetics and long-term durability. DFT calculations verify that the PdSm NCs/C catalyst modulate the reaction pathway of ethanol oxidation with lower energy barriers as compared with Pd catalyst, accounting for the improved catalytic performance. The present study provides a feasible strategy to create rare earth metal-doped bimetallic nanocrystals with controlled morphology for rational design over fuel cell catalysts and could be extended to other noble metals or alloys.
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高影响因子
Journal of the American Chemical Society
·
2022
·
IF 16.383
Chuying Ye,Jiawei Jiang,Shaolan Zou,Wenbo Mi,Yin Xiao
We developed type-II core–shell nanocrystals (NCs) with a chiral low-dimensional perovskite shell and an achiral 3D MAPbBr3 core. The core–shell NCs exhibit spin-polarized luminescence at the first excitation band of the achiral core, which is due to the chiral-induced spin selectivity (CISS) effect-governed spin-dependent shell-to-core electron transportation and the subsequent electron–hole recombination in the core. The preferred spin state of the transferred electrons is determined by the handness of the chiral shell. For the core–shell NCs film, a photoluminescence quantum yield (PLQY) of 54% and a circularly polarized luminescence (CPL) with a maximum |glum| of 4.0 × 10–3 are obtained at room temperature. Finally, we achieved a spin-polarized light-emitting diode (spin-LED), affording a circularly polarized electroluminescence (CP-EL) with a |gCP-EL|of 6.0 × 10–3 under ambient conditions.
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2022
·Vol. 24
·期 10
·2200509
·
IF 4.122
Jianchun Jiang,Yongqing Zhang,Jiahang Zhou,Yizhou Jiang,Yunbo Li
Ultrathin gold nanowires (AuNWs) have an important role and promising applications in areas of wearable sensors, matter detection, and flexible transparent electronic materials. But oleylamine (OAm) ligand on the ultrathin AuNWs surface leads to high junction resistance and the inherent Rayleigh instability leads to decomposition into gold spheres within a few days. To eliminate these two disadvantages, herein, the implementation of one facile H 2 S gas treatment method to improve the conductivity and stability of ultrathin AuNWs is tried. The conductivity of AuNWs on the interdigital electrode can be improved by 4 × 10 7 times because the AuNWs became bent and cross-linked, due to the H 2 S exchange of the ligand OAm. In addition, the conductivity of the three-layer ultrathin AuNW film on polyethylene terephthalate (PET) can be improved by at least 2000 times. The ultrafine structure of AuNWs can be maintained for more than 1 week at room temperature, which attributes to H 2 S that can protect the surface structure of AuNWs. The findings highlight a new method of the ultrathin AuNWs for exceeding improvement in electronic conduction and stability.
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高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Cheng Zhao,Jiabin Shen,Shanshan Xu,Jing Wei,Haiquan Liu,Siqi Xie,Yingjie Pan,Yong Zhao,Yongheng Zhu
Trimethylamine (TMA) is an organic amine gas used as an important index to assess the seafood freshness. In this work, an ultra-efficient trimethylamine gas sensor was constructed by ultrasonic treatment loading of Au nanoparticles (∼4 nm) on WO 3 nanosheets prepared by solvothermal self-assembly method. The response of the sensor to 25 ppm TMA was as high as 217.72 (R air /R gas ) at 300 ℃. In addition, the Au/WO 3 nanosheets sensor exhibited rapid response-recovery time (8 s/6 s), low detection limit (0.5 ppm), and high selective detection of TMA. Moreover, the composition of volatiles produced by decay of Larimichthys crocea (0–15 days) was examined, which proved that the detection of TMA by the Au/WO 3 sensor can evaluate the freshness of Larimichthys crocea . Such a magnificent gas sensing performance reveals that the Au/WO 3 sensor has remarkable application potential in rapid and non-destructive seafood freshness assessment on the spot.
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高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 12
·1647-1657
·
IF 8.683
Huanhuan Zhang,Lin Yang,Hao Chen,Wenqiang Ma,Rui Wang,Guozhong Cao
Lead-free metal halides have gained considerable attention due to their excellent optoelectronic properties; however, the direct synthesis of white light sources remains a challenge for developing high-performance white light-emitting diodes (WLEDs). Herein, we synthesized all-inorganic copper-based ternary halides using a microwave method. Through a strategy of controlling the amount of cuprous iodide (CuI), two highly efficient light emitters, blue-emissive Cs3Cu2I5 and yellow-emissive CsCu2I3, can be obtained. The large Stokes-shifted broadband emission with a relatively long radiative lifetime is ascribed to the self-trapped exciton (STE) formation. The unique negative thermal quenching suggests that carrier transfer from more deeply trapped states to shallowly trapped states is beneficial for enhancing the STE emission. Moreover, with an increased amount of CuI, the as-synthesized Cs3Cu2I5@CsCu2I3 composites exhibit a series of stable cold/warm white-light emissions. The bright WLEDs ranging from cold-white (12810 K) to pure-white (6109 K) and warm-white (4149 K) are displayed by placing the Cs3Cu2I5@CsCu2I3 composite directly onto a commercial ultraviolet chip (310 nm), and an ultra-high color-rendering index (CRI) of 92 is achieved. The results imply that highly emissive and color-tunable copper-based halide composites open the door to explore their potential applications in next-generation solid-state lightings.
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高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Dengfeng Luo,Sirui Yang,Wei Zhang,Qing Zhang,Limei Cha,Li Dang,Ming-De Li
Doping metal ions into lead halide perovskite nanocrystals is one of the most efficient strategies to control their photoelectric properties. Here, we develop a simple and low-cost route to synthesize the high-quality alkaline-earth metal ion (AE2+)-doped CsPbBr3 nanocrystals at room temperature. The almost 100% promoted photoluminescence quantum yield behavior of AE2+-doped CsPbBr3 nanocrystals is demonstrated by an ultrafast dynamics study and theoretical calculations on the dopant defect formation energies and electronic properties. The AE2+ dopants can promote the radiation recombination of carriers by essentially reducing the carriers trapped into intraband and interband defect states and promote the intraband coupling. Furthermore, Br– and Pb2+ vacancies can be eliminated to enhance the short-range order of the CsPbBr3 lattice and enrich the conduction band edge states, leading to the photoluminescence enhancement of CsPbBr3 nanocrystals. Our studies provide new insights into the mechanism of AE2+-doped effects and present guiding strategies for improving the optical performance of doped perovskite nanocrystals.
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高影响因子
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