ELECTROCHEMISTRY COMMUNICATIONS
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2021
·
IF 4.724
Lin Tang,Jinliu Wei,Zhixiong Cai,Feiming Li,Maosheng Zhang,Xiaomei Chen,Xi Chen
The electrochemical behavior and consequent luminescence properties of Mn-doped CsPbCl 3 perovskite (Mn:CsPbCl 3 ) nanocrystals (NCs) were investigated by cyclic voltammetry (CV) and electrochemiluminescence (ECL) measurements. Mn:CsPbCl 3 NCs could be electrochemically injected with electrons or holes at different potentials to produce ECL through both annihilation and coreactant routes. Importantly, it has been found that the ECL involving the coreactant could originate from two pathways: energy recombination at the surface, and energy transfer from the excited CsPbCl 3 host to the dopant center, producing emission via Mn d - d transition, which is different from the photoluminescence (PL) of Mn:CsPbCl 3 NCs alone, which contains dual emissions from both the host and the dopant.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Peng Wang,Hao Cui,Chengxin Wang
Although Pt-based alloy catalysts have been considered promising candidates for fuel cell applications, constructing highly efficient, multifunctional Pt-based catalysts that simultaneously boost the three key reactions (MOR, ORR and HOR) in proton exchange membrane fuel cells (PEMFCs) remains a huge challenge. Herein, PtMo-CeO x hybrids with interesting ultrathin and ultralong nanowire assemblies (NAs) structure are synthesized by a one-pot solvothermal method without templates. The PtMo-CeO x -NAs catalyst exhibits 5.2-fold, 6.9-fold and 2.4-fold higher mass activity than commercial Pt/C towards the MOR, ORR and HOR simultaneously and shows excellent durability and CO poisoning tolerance. Detailed experiments reveal that the enhancement should be due to strain and ligand effects. Most impressively, when PtMo-CeO x -NAs membrane electrode assemblies (MEAs) fabricated by a catalyst-coated method are used both as the anode and cathode in PEMFCs, the performance of fuel cells is dramatically boosted compared to those with Pt/C.
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Small
·
2021
·Vol. 17
·期 39
·2103065
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IF 13.281
Wei Gao,Ting Wang,Jiangtao Xu,Ping Zeng,Wenfei Zhang,Yunduo Yao,Changsheng Chen,Mingjie Li,Siu Fung Yu
The advantage of using flexible metallic structures as the substrate of flexible lasers over plastic materials is its strong mechanical strength and high thermal conductivity. Here, it is proposed to deposit CsPbBr 3 perovskite quantum dots onto Ni porous foam for the realization of flexible lasers. Under two-photon 800 nm excitation at room temperature, incoherent random lasing emission is observed at ≈537 nm. By external deformation of the Ni porous foam, incoherent random lasing can be tuned to amplified spontaneous emission as well as the corresponding lasing threshold be controlled. More importantly, it is demonstrated that the laser is robust to intensive bending (>1000 bending cycles) with minimum effect on the lasing intensity. This flexible laser is also shown to be an ideal light source to produce a “speckle” free micro-image.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Xiaoyang Yue,Lei Cheng,Jiajie Fan,Quanjun Xiang
Heterojunction construction is a universal and effective approach to achieve high-efficiency photocatalysts. Towards these well-designed heterojunctions, modulation on steering dynamic charge transfer holds great promise in further performance stimulation. Herein, 2D/2D BiVO 4 /CsPbBr 3 S-scheme heterojunctions, of which CsPbBr 3 nanosheets (NSs) are in-situ face-to-face grown onto BiVO 4 NSs, are designed as cornerstones for further carrier managements. Briefly, with controllable heterostructure regulation, an intimate heterointerface between BiVO 4 and CsPbBr 3 NSs with similar size can be obtained accompanied with a maximally intensified interfacial interaction, largely boosting charge transfer across the interfacial conjunction. Moreover, by further tailoring the intrinsic O vacancy ( V O • • ) of BiVO 4 , the gradient Fermi level shift towards its valence band is finely tuned, yielding an enlarged Fermi level gap and an enhanced internal electric field (IEF) over BiVO 4 /CsPbBr 3 heterojunctions. Such an intensified IEF provides a powerful driving force for directional charge migration, resulting in high charge separation and utilization efficiency. Hence, the optimized BiVO 4 /CsPbBr 3 S-scheme heterojunction features desirable accelerated dynamic carrier mobility, delivering comparably high CO 2 -to-CO conversion with a turnover number (TON) near 230 without any co-catalyst or sacrificial agent. The accelerated S-scheme charge transfer mechanism is revealed in detail by X-ray photoelectron spectroscopy (XPS), theoretical calculations, photo-irradiated Kelvin probe force microscopy and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS).
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JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Jiamin Xiong,Sheng Cao,Ke Xing,Mingyan Chen,Ruosheng Zeng,Bingsuo Zou,Jialong Zhao
All-inorganic perovskite nanocrystals (NCs) are emerged as promising materials for illumination and display applications due to their excellent luminescent properties. However, the low photoluminescence quantum yield (PLQY) of violet/blue emission and poor stability of NCs restrict their development. Herein, we report an effective strategy for enhanced PLQY and stability of CsPb(Cl/Br) 3 NCs by incorporating Nd 3+ ions. It was found that Nd 3+ ions could be doped into the host perovskite NC lattice which exists in NCs as Nd 3+ . The steady-state and time-resolved PL spectra showed the decrease of the defect state density in doped NCs with the increase of Nd content. The maximum PLQY of the as-prepared Nd 3+ doped CsPbCl 3 NCs was increased up to 58% at the Nd/Pb molar ratio of 3/1. Compared with undoped NCs, the water stability of Nd 3+ doped CsPbCl 3 NCs was significantly improved. The prepared Nd 3+ doped CsPbCl 3 NCs were further post-treated by anion exchange reaction with PbBr 2 at room temperature . The PL of the as-synthesized Nd 3+ doped CsPb(Cl/Br) 3 NCs covered the emission range of 408–503 nm, and the maximum PLQY could reached 93%. This work discourses that Nd 3+ ions can improve the PLQY and stability of blue and violet perovskite NCs, which will promote their practical application.
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Foods
·
2021
·Vol. 10
·期 11
·2810
·
IF 4.35
Xinpeng Yan,Zhong Zhang,Runguang Zhang,Tian Yang,Guoying Hao,Li Yuan,Xingbin Yang
Given the imperative of monitoring organophosphorus pesticides (OPs) residues in the ecosystem, here a novel, facile and sensitive fluorescence sensor is presented for the rapid detection of dimethoate. In this work, surface molecularly imprinted polymer (SMIP) and microfluidic technology had been introduced to enhance the selectivity and portability of the described methodology. Oil-soluble CdSe quantum dots (QDs) synthesized in a green way were used as fluorescent material for the selective detection of dimethoate on the basis of static quenching and photoinduced electron transfer mechanism. Among many kinds of paper materials, glass fiber paper was used as the novel substrate of paper chip due to low pristine fluorescence and better performance when combining CdSe QDs. In the process of molecular imprinting, the interaction between several functional monomers and dimethoate molecule was investigated and simulated theoretically by software to improve the selectivity of the sensor. Consequently, the fabricated novel detection platform could effectively respond to dimethoate in 10 min with the concentration range of 0.45–80 μmol/L and detection limit of 0.13 μmol/L. The recovery in the spiked experiment soybean sample was in an acceptable range (97.6–104.1%) and the accuracy was verified by gas chromatography-mass spectrometry, which signified the feasibility and potential in food sampling.Keywords:oil-soluble CdSe QDs;dimethoate;microfluidic paper chip;fluorescence sensor
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Aizhao Pan,Yajie Zhou,Chunyu Zhao,Chengyu Shi,Youshen Wu,Yanfeng Zhang,Yi Liu,Ling He
All-inorganic lead halide perovskite nanocrystals (NCs) have received considerable attention due to their exceptional optoelectronic characteristics and photovoltaic performance, but their practical applications are restricted by their poor stability. Integrating multifunctionality such as high stability, outstanding flexibility, stretchability and self-healing capability has also been highly desired for flexible full-color displays, soft optical devices, and wearable applications. Here, we developed a facile one-pot photopolymerization strategy to produce highly stable self-healing CsPbBr 3 -based elastomers with outstanding flexibility, scalability, and stretchability. The obtained perovskite NCs (∼10 nm; PLQY of 78%) were capped and passivated with bifunctional methacrylic acid ligands, which provided free double bonds on their surface. The CsPbBr 3 -based elastomers were obtained via the photo-induced copolymerization of functionalized CsPbBr 3 NCs with methyl methacrylate (MMA) and n -butyl acrylate (BA) at room temperature. This yielded homogenous CsPbBr 3 nanocrystals (∼10 nm) dispersed in the copolymer, which displayed a high photoluminescence quantum yield (PLQY > 70%). Versatile and specific luminescent shapes and patterns could be fabricated from the CsPbBr 3 -based elastomers by regulating the constituent content, reaction time, or molding process. The obtained CsPbBr 3 -based elastomers exhibited high air and water stability, high stretchability (∼1300% elongation), tensile recovery (∼100%), and excellent self-healing capability, which also permitted twisting or bending. This facile photopolymerization strategy greatly expands the methods for fabricating highly stable perovskite materials with excellent stretchability and self-healing properties for use in flexible optoelectronic devices.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
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IF 3.764
Hongbin Shi,Xiaofeng Dai,Qing Liu,Teng Zhang,Yabing Zhang,Yuling Shi,Tao Wang
Magnetic CuNi alloy nanoparticles (CuNi NPs) for the catalytic transfer hydrogenation (CTH) of nitroarene were successfully prepared by the facile thermal decomposition of copper formate (Cuf) and nickel formate (Nif) simultaneously. Liquid paraffin served as solvent, and oleylamine (OAM) acted as both complexing agent and stabilizer. The particle size and Cu/Ni composition of CuNi NPs could be controlled by adjusting the amount of OAM and the Cu/Ni ratio of the precursor. The average diameter of the prepared CuNi NPs ranged from 10.2 to 56.9 nm. It had been confirmed that CuNi NPs were an alloy of Cu and Ni and effectively resistant to oxidation. The prepared CuNi NPs could be separated under an external magnetic field without any energy consumption since they were superparamagnetic. Among the prepared CuNi NPs with different compositions, the Cu3Ni7 NPs were the best catalyst for catalytic transfer hydrogenation of nitrobenzene with ethylene glycol (EG) as the hydrogen donor, giving a nitrobenzene conversion of 99% and an aniline yield of >97%. The conversion and yield remained above 95% and 80% respectively after 10 cycles of NOBF4-treated Cu3Ni7 NPs, demonstrating good reusability for the CTH reaction. This work reported a novel method for preparing magnetic CuNi NPs and also provided a new approach for the hydrogenation of nitroarene catalyzed by non-noble metals in a green environment.
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Advanced Optical Materials
·
2021
·Vol. 9
·期 24
·2101297
·
IF 9.926
Huihui Li,Heng Yang,Rui Yuan,Zhixiang Sun,Yunling Yang,Jingtai Zhao,Qianli Li,Zhijun Zhang
A scintillation screen with ultrahigh spatial resolution, fast decay time, and high stability is the key to commercial application. Herein, a pixelated-structure scintillation screen of CsPbBr 3 nanocrystal arrays based on anodized aluminum oxide (AAO) is reported, and its scintillation properties for X-ray imaging are explored. It is of note that ultrahigh spatial resolution (2 µm), fast photoluminescence decay time (9 ns), and high stability (>42 d) are successfully achieved by the pixelated CsPbBr 3 -AAO arrays scintillation screen. Considering the decent scintillation properties and high stability, one has reason to assume that the pixelated CsPbBr 3 -AAO arrays scintillation screen may find an application as a new X-ray scintillation screen.
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JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Naixin Li,Fang Lei,Xiaoxiao Ji,Luqiao Yin,Ying Shi
While there has been extensive investigation of synthesizing perovskite nanocrystals (NCs) in light emitting diode (LED) with high photoluminescence performance and stability, they are still limited by chemical and phase instabilities. Moreover, the protonation occurring between oleic acid (OA) and oleyl amine (OAm), which are common capping ligands to passivate the NCs , promotes the degradation of photoluminescence properties. To overcome these issues, we report a post synthesis passivation strategy for self-assemble CsPbBrI 2 1D nanobelt by using bidentate ligand, namely homophthalic acid. The introduced homophthalic acid can passivate the CsPbBrI 2 surface defects by reducing exposing Pb 2+ to prevent nonradiative recombination. Benefiting from homophthalic acid, the passivated NCs exhibit narrow red photoluminescence at 640 nm with 74 % quantum yield (QY) and remain phase stable after 4 months. The external quantum efficiency (EQE) of the white light emitting diode (WLED) fabricated with QDs passivated with homophthalic acid is 1.99 %, its CIE chromaticity coordinate is (0.31,0.33) and the power efficiency is 2.13 lm/W.
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Small
·
2021
·Vol. 17
·期 46
·2103425
·
IF 13.281
Yipeng Huang,Zhiwei Lai,Jingwen Jin,Fangyuan Lin,Feiming Li,Longhui Lin,Dongjie Tian,Yiru Wang,Rongjun Xie,Xi Chen
Temperature sensing based on fluorescent semiconductor nanocrystals has recently received immense attention. Enhancing the trap-facilitated thermal quenching of the fluorescence should be an effective approach to achieve high sensitivity for temperature sensing. Compared with conventional semiconductor nanocrystals, the defect-tolerant feature of lead halide perovskite nanocrystals (LHP NCs) endows them with high density of defects. Here, hollow mesoporous silica ( h -SiO 2 ) template-assisted ligand-free synthesis and halogen manipulation (chloride-importing) are proposed to fabricate highly defective yet fluorescent CsPbCl 1.2 Br 1.8 NCs confined in h -SiO 2 (CsPbCl 1.2 Br 1.8 NCs@ h -SiO 2 ) for ultrasensitive temperature sensing. The trap barrier heights, exciton–phonon scattering, and trap state filling process in the CsPbCl 1.2 Br 1.8 NCs@ h -SiO 2 and CsPbBr 3 NCs@ h -SiO 2 are studied to illustrate the higher temperature sensitivity of CsPbCl 1.2 Br 1.8 NCs@ h -SiO 2 at physiological temperature range. By integrating the thermal-sensitive CsPbCl 1.2 Br 1.8 NCs@ h -SiO 2 and thermal-insensitive K 2 SiF 6 :Mn 4+ phosphor into the flexible ethylene–vinyl acetate polymer matrix, ratiometric temperature sensing from 30.0 °C to 45.0 °C is demonstrated with a relative temperature sensitivity up to 13.44% °C −1 at 37.0 °C. The composite film shows high potential as a thermometer for monitoring the body temperature. This work demonstrates the unparalleled temperature sensing performance of LHP NCs and provides new inspiration on switching the defects into advantages in sensing applications.
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INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Yan Zhang,Jian Wang,Xiongxi Shi,Peiping Zhang,Weikun Ning,Wenqing Li,Cundi Wei,Shiding Miao
Seeking highly efficient non-preference electrocatalytic materials that serve photoelectrochemical (PEC) water splitting in acidic systems is expectant in the context of environmentally friendly production. We designed Ni2P electrocatalysts synthesized in oil phases via the hot-bubbling method with superb stability in air and sulfuric acid solution for PEC, which were found with excellent hydrogen evolution performance. A tunable particle size and highly exposed (001) planes of Ni2P nanocrystals were achieved. The designed catalysts achieved a notable promotion in the hydrogen evolution reaction activity compared to that of Ni2P synthesized in the water phase. More specifically, the electrode prepared by self-assembled Ni2P nanoparticles was found to have decent over-potential of η10 = 164 mV in darkness and was further decreased to 129 mV with irradiation of visible light. The cyclic stability tests manifested brilliant durability in 0.5 M H2SO4. Measurement of the transient photocurrent response and PEC water splitting catalytic performance indicated that the Ni2P had high carrier concentration upon irradiation, lower carrier recombination probability, and prolonged photo-response lifetime (3.03–3.14 s).
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