Journal of Materials Chemistry A
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2021
·Vol. 9
·期 8
·5026-5032
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IF 12.732
Min Liu,You Xu,Songliang Liu,Shuli Yin,Mengying Liu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The hydrogen evolution reaction (HER) is an important process in electrochemical water splitting, and the key factor for HER technology lies in the development of cost-effective and highly efficient electrocatalysts. Herein, phosphorus (P)-modified ruthenium (Ru)–tellurium (Te) dendritic nanotubes (RuTeP NTs) are prepared via a facile two-step synthetic strategy using Te nanowires as the starting materials. The RuTeP NTs display excellent catalytic performance for the HER in alkaline media with an overpotential of only 35 mV at a cathodic current density of 10 mA cm−2, which is even superior to that of the commercial Pt/C catalyst. Detailed investigations indicate that the modification with P can improve the electrocatalytically active surface area and electron transfer capability and together with Te, modify the electronic structure of Ru atoms, which synergistically promote the HER electrocatalysis. The present work may open a new avenue to construct P-modified electrocatalysts with a rational design morphology and structure for water splitting or other electrocatalytic reactions.
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Nanoscale
·
2021
·Vol. 13
·期 4
·2632-2638
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IF 7.79
Xiaowei Chen,Wei Wang,Xuejiao Chen,Xinyan Liao,Zixi Lyu,Kai Liu,Shuifen Xie
Platinum (Pt)-based nanocatalysts with a high density of surface atomic steps hold great prospects in electrocatalysis. However, the structural instability under harsh redox conditions is still a rigorous challenge. Here, we demonstrate that ternary PtCoRh alloyed spiral nanowires (SNWs), which have the advantages of one-dimensional nanowires, alloy synergy, surface atomic steps, and anti-corrosive Rh incorporation, can serve as active and robust MOR electrocatalysts in acidic media. The results showed that the Pt77Co11Rh12 SNWs delivered the highest mass activity (1.48 A mg−1) and specific activity (4.76 mA cm−2), as well as the best durability in the long-term MOR test, compared with the Pt85Co10Rh5 and Pt85Co15 SNWs and Pt black. Further inspections of the morphology, composition, and electronic structure revealed that the incorporated Rh atoms not only stabilized the highly rugged SNWs and the easily leaching Co atoms but also delicately tuned the electron transfer among the three metallic elements, leading to the enhancement of MOR activity, structural stability and anti-CO-poisoning ability. Our work provides a rational strategy for the development of highly efficient and durable alcohol oxidation electrocatalysts.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 2
·930-938
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IF 3.288
Pengyin Deng,Wei Wang,Xiqing Liu,Liang Wang,Yongsheng Yan
The detection of o-nitrophenol in the environment is of great significance to environmental protection. In this paper, the fluorescence sensor of CsPbBr3@SHFW was synthesized by an ultrasonic assisted method using perovskite quantum dots as the fluorescence source and a super hydrophobic porous organic polymer framework (SHFW) as the protective layer. Then CsPbBr3@SHFW was used to detect o-nitrophenol in dichloromethane. Under the optimum conditions, the detection limit of CsPbBr3@SHFW was 7.69 × 10−3 μM, and the linear range was 0–280 μM. It was also proved that the fluorescence quenching of this work is electron transfer. This work provided help for the construction of a stable perovskite quantum dot sensor and the application of a perovskite quantum dot sensor in the field of fluorescence detection.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Xinxin Zhu,Lei Huang,Min Wei,Panagiotis Tsiakaras,Pei Kang Shen
A novel self-etched engineering of Pt-Co nanodendrite in nanoframe (Pt-Co ND-NF) synthesized through a simple one-pot approach, for the first-time. The modulation mechanism of Pt-Co ND-NF formation is established by investigating critical factors of adjusting: i) the water amount, ii) the ratio of mixed solvent oleylamine to oleic acid and iii) the amount of surfactant hexadecyl trimethyl ammonium bromide. Besides, the formation process of Pt-Co ND-NF is carefully explored with reaction time progress, further confirming the state of Pt-Co nanoframe blockade on Pt-Co nanodendrite (ND). Pt-Co ND-NF exhibits improved catalytic performance for oxygen reduction reaction (ORR), in which mass activity (0.939 A mg Pt −1 ) is much higher (∼500 %) than that of commercial Pt/C (0.187 A mg Pt −1 ), respectively. Furthermore, Pt-Co ND-NF shows enhanced stability during the accelerated durability tests (ADTs) for 50,000 cycles. Pt-Co nanodendrites in nanoframe with Pt skin, create a novel protection with an external nanoframe (NF) and obtain a unique catalytic material Pt-Co ND-NF, which could provide promising ways for highly strengthening catalytic activity.
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Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 39
·9084-9093
·
IF 5.344
Jiaxin Zuo,Minfeng Huo,Liying Wang,Jia Li,Yu Chen,Ping Xiong
Nanomedicine that enables multiple synergetic treatments provides effective non-invasive treatment modalities for cancer therapy. Yet treatments for oral squamous cell carcinoma (OSCC) are rarely reported. Here, we designed OSCC-targeting multi-functional nanomedicines to overcome the therapeutic obstacles during OSCC treatments, including ineffective chemotherapy, and the traumatic surgery and radiotherapy. The urokinase plasminogen activator receptor (uPAR)-targeting ligand AE105 decorated dendritic mesoporous silica nanoparticles (DMSN) encapsulating photonic active ultrasmall Cu2−xS NPs and sonosensitizer Rose Bengal (RB) have been rationally designed and constructed (designated as Cu2−xS-RB@DMSN-AE105, abbreviated as CRDA). These CRDAs initially target the uPAR, which is overexpressed in the OSCC cell membrane, to increase the localized accumulation of CRDAs at tumor sites. Under the irradiation of both near-infrared laser and ultrasound, the in situ photonic-hyperthermal and sonodynamic effects are respectively enabled to induce the cell death of OSCC. Upon both in vitro/in vivo challenges, tumor cells/xenografts have been efficiently eradicated, achieving the targeting and synergetic treatment modality against the OSCC with satisfactory biocompatibility.
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Nano Energy
·
2020
·
IF 16.602
Shuai Zhang,Hongli Liu,Xianggao Li,Shirong Wang
All-inorganic perovskite quantum dots (PQDs) have attracted great attention in optoelectronic applications . However, compared with green and red PQDs, the poor photoluminescence quantum yield (PLQY) and terrible external quantum efficiencies (EQE) of blue-emission PQDs light-emitting diodes (QLEDs) have limited their further development in display field. Here, a general strategy for enhancing PLQY and EQE through lanthanum ions doping is proposed. Density functional theory (DFT) calculations confirmed that the partial substitution of La 3+ for Pb 2+ leads to a reduced defect states and an increased radiative recombination , meanwhile, a higher carrier temperature and exciton binding energy are also obtained. In consequence, a maximum PLQY of 84.3% is obtained for La 3+ -doped CsPb(Br x Cl 1-x ) 3 PQDs with emissions ranging from 448 to 500 nm. In terms of devices, phase separation and ion migration are effectively alleviated with La 3+ profiting from the constricted lattice and stronger interaction between La and Cl. Resultantly, QLEDs with La 3+ -doped PQDs show the maximum EQE of 2.17% (480 nm) and 3.25% (489 nm), which is higher than state-of-the-art records at this wavelength.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Min Lu,Jie Guo,Siqi Sun,Po Lu,Xiaoyu Zhang,Zhifeng Shi,William W. Yu,Yu Zhang
All-inorganic CsPbX 3 (X = Cl, Br, I) quantum dots (QDs) are promising materials for light-emitting diodes (LEDs), but the long insulating ligands such as oleic acid (OA) and oleylamine (OLA) on the QD surface limit the device performances. They reduce the electrical conductivity of QDs, while their loss deteriorates the photoluminescence and stability. To overcome these issues, octylphosphonic acid (OPA) with a shorter carbon chain was added in the synthesis of perovskite QDs to partially replace OA ligands. Owing to the strong interaction between OPA and Pb atoms, the undercoordinated Pb atoms on the surface of CsPbI 3 QDs can be effectively passivated by OPA, leading to improved fluorescence quantum efficiency (close to unity) and solution stability. Furthermore, the electrical conductivity of QD films was also enhanced from 5.3 × 10 −4 to 1.1 × 10 −3 S/m by using shorter chain OPA ligands. Finally, highly efficient red perovskite QD LEDs with peak external quantum efficiency (EQE) of 12.6% and maximum luminance of 10171 cd m −2 were achieved in a top-emitting device structure, a nearly 3-fold enhancement in luminance compared with pristine CsPbI 3 QDs based LEDs.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Jinming Hu,Shengyi Yang,Zhenheng Zhang,Hailong Li,Chandrasekar Perumal Veeramalai,Muhammad Sulaman,Muhammad Imran Saleem,Yi Tang,Yurong Jiang,Libin Tang,Bingsuo Zou
Due to their promising applications in foldable displays, optical communication equipment and environmental monitoring systems, flexible and broadband optoelectronic devices have gained extensive attention in recent years. Here, a flexible and broadband photodetector based on CsPbBr 3 /PbSe quantum dot (QD) heterostructures is firstly presented. The integrated QD heterostructures possess consecutive detection range from ultraviolet (UV) to long-wavelength infrared (LW-IR) regions with efficient light absorption and chemical stability, in comparison with the pristine PbSe QDs. Systematic material characterizations reveal the improved exciton dissociation, carrier transport and carrier lifetime of the QD heterostructures. Flexible photodetector Ag/CsPbBr 3 /PbSe/Ag demonstrate a high responsivity of 7.17 A/W with a specific detectivity of 8.97 × 10 12 Jones under 25 μW/cm 2 365 nm illumination at 5 V. Furthermore, it could maintain 91.2 % (or 94.9 %) of its initial performance even after bending for thousands of times (or exposing in ambient air for 4 weeks). More importantly, its response time is shortened more than three orders of magnitude as that of pristine PbSe QDs-based photodetectors. Therefore, it provides a feasible and promising method for the next-generation high-performance broadband photodetectors via constructing heterostructures of various QDs.
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LANGMUIR
·
2020
·
IF 3.557
Xian Wei,Shiliang Mei,Bobo Yang,Zhihao Chen,Hanqing Dai,Zhe Hu,Guilin Zhang,Fengxian Xie,Wanlu Zhang,Ruiqian Guo
Single-phased and dual-emissive nanocrystals with broad emission are attractive fluorescent materials for optoelectronic devices due to their unique properties. Until now, the effect of different metallic cations and inorganic anions on III–V group quantum dots (QDs) concerning luminescence features and crystalline growth has been less explored. In this work, dual-emissive InP/ZnS QDs single-doped with transition-metal compounds (Cu2+, Ag+, or Mn2+) are synthesized to compare their optical and morphological properties. The corresponding doping concentrations to realize dual emission with comparative intensity for Cu, Ag, and Mn are 0.8, 6, and 80%, which vary greatly and might be attributed to different precursor reactivities. As for the morphological and internal structures, transmission electron microscopy (TEM) images indicate that transition-metal ions have no obvious effect on the morphological properties and a higher concentration of chloride anions binding with an In-rich interface could conduce to a homogeneous distribution and triangular growth through the comparison of different metal chlorides as precursors. X-ray photoelectron spectroscopy (XPS) results further demonstrate that the high-resolution In 3d spectrum of Mn-doped InP/ZnS QDs with MnCl2 is mainly dominated by In–P bonds, indicating fewer intermediate chemical states. These results concerning well-defined InP/ZnS QDs could promote more diverse insight into surface chemistry and help to better understand the growth mechanism, thus making it possible to regulate InP/ZnS QDs into desired formats for different practical applications like white light-emitting diodes (LEDs).
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Nanoscale
·
2020
·Vol. 13
·期 6
·3528-3542
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IF 6.895
Yaxing Liu,Weiyin Li,Guizhe Zhao,Gang Qin,Yuexia Li,Yaqing Liu
The lack of direct insight into the microstructural evolution of catalytic materials under electrochemical polarization has inhibited the development of heterogeneous catalysts. By investigating a typical Au@Pd core–shell nanostructure, the present study discloses the microstructural evolution of heterogeneous catalytic materials during the methanol electrooxidation reaction (MOR). The electrocatalytic activity of the as-prepared Au@Pd_core–shell nanoparticles continuously increased during the first 100 successive voltammetry cycles of the MOR. Microstructural characterization studies revealed that during the MOR, an Au/Pd mixed bimetallic shell was formed by the self-driven microstructural evolution of the Au@Pd_core–shell nanoparticles. Both the experimental and calculation results indicated that the Au/Pd mixed bimetallic shell reduced the binding strength of OH− and CO on the catalyst surface. The exposed Au atoms in the shell region also produced large-scale reactive ˙OH radicals that facilitated the oxidative removal of the adsorbed carbonaceous species from the adjacent Pd active sites.
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Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yubin Zhao,Xiao Zhang,Cong Xie,Wenbin Shi,Ping Yang,San Ping Jiang
Although inorganic cesium halide lead perovskite nanocrystals (NCs) exhibited tunable photoluminescence (PL), it is still a challenge for such NCs with multicolor and white emission for application. In this article, as-synthesized Mn:CsPbCl3 NCs were treated using an oleoamine solution of CdX2 (X = Cl, Br) to get a high PL quantum yield (PLQY) and stability. CdCl2 passivated the surface defects of Mn:CsPbCl3 NCs through anion exchange to get high PL intensity, especially to increase Mn emission. The PLQY of the sample was increased from 15 to 85% after ion exchange. Furthermore, the treatment of CdBr2 resulted in the appearance of a powerful blue emission peak, and the PLQY increased to 95.7%. The PL decay kinetics of samples was studied before and after treatment. Mn2+ emission in Mn:CsPb(Cl/Br)3 NCs was increased because of the reaction of CdBr2 and Mn:CsPbCl3 NCs. Interestingly, the tunable and bright white emission from Mn:CsPb(Cl/Br)3 NCs was obtained by controlling the amount of Br. The controlling of Mn emission plays an important role in changing the Commission Internationale de l’Eclairage color coordinates. Because of bright and tunable PL, the NCs may be used in white-light-emitting diodes.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-8
·
IF 3.998
Kou Juanrong,Wang Yongkai,Liu Xiaoyu,Zhang Xianju,Chen Gaoyu,Xu Xiangxing,Bao Jianchun,Yang Kaili,Yuwen Lihui
Antimony nanocrystals (Sb NCs) are of interest in energy storage, catalysis and cancer therapy for its special physical, chemical and biomedical properties. However, methodology challenges still remain in preparation of colloidal Sb NCs, due to the restricted reaction solution systems, high temperature and time costing for common routes. Herein, size controllable colloidal Sb NCs were continuously prepared by pulsed laser ablation of Sb target in different solvents, owning to the metal nanodroplet explosive ejection and thermal evaporation mechanisms. These well dispersed and stable Sb NCs showed excellent photothermal property in the near-infrared-II window.
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