Materials Today Chemistry
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2023
·
IF 7.3
C.-H. Sun,X.-Q. Li,T.-M. Zhu,H.-Y. Yu,Y.-M. Liang,Y.-H. Sun,J.-M. Nan
SnS is a promising anode material for sodium-ion batteries (SIBs) due to its high theoretical specific capacity, but the poor intrinsic conductivity, bulk expansion and shuttle effects brought by polysulfides seriously limit its practical use. Here, soft/rigid SnS&TiS 2 compounds with carbon nanotubes (ST@CNTs) is designed to overcome the shortcomings. The rigid TiS 2 , as the strong backbone of SnS&TiS 2 , relieves the expansion stress caused by SnS after sodiation, together with CNTs improve the materials conductivity. TiS 2 generates many sulfur defects under the synergistic effect of SnS, which can regulate the sodium-ion embedding sites to stabilize the compound structure and decrease the sodium-ion diffusion energy barrier. Moreover, rigid TiS 2 can adsorb polysulfides induced by SnS, thus suppresses the shuttle effect and improves the cycling and rate performances. Fortunately, the above conclusions are confirmed by the DFT calculations. The ST@CNTs provide a specific capacity of 550 mAh/g at 1.0 A/g after 300 cycles, and a high-rate capability of 443 mAh/g at 2.0 A/g. This soft/rigid misfit strategy combines the advantages of high modulus of rigid layers and high sodium-ion storage capacity of soft layers, which gives an idea for the development of new anode candidates for SIBs.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Jiahang Zhou,Lingui Hu,Minqiang Xia,Yixuan Du,Yunbo Li
Ultrathin gold nanowires (AuNWs) play an important role in wearable devices, biological detection, and other fields. However, their applications in transparent conduction are limited due to high junction resistance caused by the oleyamine (OAm) ligand and structural instability caused by Rayleigh instability. A treatment method has been proposed to eliminate these two defects via a hydrogen sulfide (H2S) atmosphere and heat treatment. The nanowires are subjected to heat treatment in a hydrogen sulfide atmosphere, which induces the nanowires to fracture into gold particles (AuNPs) and evolve into a stable spider-web-like structure. As a result, the conductivity of the treated film is significantly improved, reaching 65 Ω/sq at 120 °C, 50 min, and 1000 ppm of H2S. The electrical properties of the film can be maintained for more than one month. This method suggests a promising approach to ultrathin AuNWs for excellent improvement of electronic conduction and stability, which can be used in wearable devices.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
·
IF 4.4
Hongye Liu,Qianwen Li,Yan Ma,Siyu Wang,Yanan Wang,Bing Zhao,Lichun Zhao,Ziping Jiang,Lili Xu,Weidong Ruan
Surface-enhanced Raman scattering (SERS) has outstanding merits in biochemical molecular analysis, and the development of new SERS substrates is the focus of research. Herein, In 2 O 3 nanoparticles (NPs) were synthesized by a high temperature pyrolysis method with cubic phase and small particle size at 10 nm. The structures and properties of In 2 O 3 NPs were characterized by X–ray powder diffraction (XRD), transmission electron microscope (TEM) and other characterization methods. Additionally, the SERS spectra of In 2 O 3 -MBA with the enhancement factor ( EF ) up to 1.22 × 10 4 is discussed. The results demonstrate that there is a charge transfer (CT) effect revealed between the adsorbed molecules of 4-mercaptobenzoic acid (4-MBA) and the substrates of In 2 O 3 NPs, and it could be excited by long wavelength energy. Based on the In 2 O 3 NPs, the study is beneficial to develop more potential semiconductor SERS substrates.
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Catalysts
·
2023
·Vol. 13
·期 7
·1048
·
IF 3.9
Wanli Liu,Jinfeng Liu,Xiaoqian Wang,Jiazhen He,Yuqing Li,Yong Liu
Practical applications of CsPbX3nanocrystals (NCs) are limited by their poor stability. The formation of a heterojunction between CsPbX3NCs and oxides is an effective means to protect perovskite from polar solvents and other external factors. Significantly improving the stability and photocatalytic properties of the core/shell perovskite is very important for its application in photoelectric and photocatalytic technology. Here, we report the synthesis of asymmetrical CsPbBr3/TiO2core–shell heterostructure NCs at the single-particle level by hot-injection liquid-phase synthesis and sol–gel method, where each CsPbBr3NCs is partially covered by titanium dioxide. We tested not only the optical properties of the material but also the electrochemical impedance and photocurrent density of the material in sodium sulfate solution. It is shown that the type II arrangement is generated at the heterogeneous interface, which greatly facilitates the separation of electron–hole pairs and increases the carrier transport efficiency. Compared with CsPbBr3NCs, CsPbBr3/TiO2has higher photocatalytic efficiency. More crucially, due to the protection of the titanium dioxide shell, the product has higher long-term stability in humid air compared with bare CsPbBr3NCs. The asymmetrical core–shell heterostructure prepared in this study not only improves the stability of CsPbX3NCs but also provides some ideas for optoelectronic device applications and TiO2-based photocatalysts.
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Catalysts
·
2023
·Vol. 13
·期 7
·1041
·
IF 3.9
Xiaoqian Wang,Wanli Liu,Jiazhen He,Yuqing Li,Yong Liu
Compared with conventional semiconductors, halide perovskite nanocrystals (NCs) have a unique crystal structure and outstanding optoelectronic properties, offering wide potential for applications in optoelectronic devices such as solar cells, photodetectors, light-emitting diodes, lasers, and displays. Rational technological design is providing vital support for the development of perovskite optoelectronics. Herein, monodisperse all-inorganic halide perovskite nanocrystals with consistent morphology and cubic crystal phase were synthesized employing a modified one-pot hot injection method to independently modulate the stoichiometric ratios of three precursors involving cesium salt, lead source, and halide. In combination with an anion exchange reaction, mixing two kinds of perovskite NCs with different halogens enables a transition from violet emission to green and finally to red emission over the entire visible region. Additionally, optical and electrochemical tests suggested that the as-synthesized halide perovskite NCs are promising for photoelectric catalysis applications.Keywords:synthesis;CsPbX3;perovskite nanocrystals
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yiqi Cui,Shuaikang Ying,Hongzhong Cai,Yan Wei,Changyi Hu
Carbon-supported platinum (Pt) for oxygen reduction reaction plays an important role in the operation of direct methanol fuel cells (DMFCs). However, complete oxidation of ethanol is difficult due to the low chemical activity of Pt / C. Herein, novel highly active Pt-Co/C nanoparticles with controllable chemical composition and particle size are prepared via a thermal reduction method. The results revealed that the catalyst (particle size: 2–4 nm) is characterized by a good size monodispersity, and exhibits satisfactory chemical activity. The nanoparticles were also characterized by an accurate and maintained stoichiometry ratio, resulting in improved electrocatalytic activity and anti-poisoning ability of the carbon-supported Pt.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 36
·19427-19434
·
IF 11.9
Jie Zhang,Mingxing Li,Dehua Wang,Binhua Chu,Shufang Zhang,Qinfeng Xu,Kai Wang
Understanding the fundamental properties of two-dimensional (2D) bismuth-based perovskites is essential for their applications in optoelectronic devices. Here, we report the room-temperature synthesis of 2D Cs3Bi2I6Cl3 nanocrystals (NCs) by an anti-solvent assisted crystallization method, which display a broad emission bandwidth with a large Stokes shift primarily originating from exciton self-trapping caused by strong electron–phonon coupling and the critical contribution of Bi–Cl bonds to the band edge is demonstrated. Furthermore, analysis of combined in situ high pressure PL, absorption, Raman and PL decay data indicates that the observed pressure-induced emission (PIE) enhancement can be attributed to the efficient surface reconstruction accompanied by the removal of surface-related trap states, as the interaction between oleic acid (OA) and Cs3Bi2I6Cl3 is strengthened at high pressure. Pressure-induced structural evolutions are well consistent with changes in their optical properties and of particular importance is the retention of 1.5 times PL intensity after releasing pressure. This highlights the importance of steric hindrance and spring effect of the OA ligand in the defect perovskite family, which retain the octahedral distortion in Cs3Bi2I6Cl3 NCs. Our study not only provides deep insights into the structure–property relationship of 2D Cs3Bi2I6Cl3 NCs, but also offers a basis for improving the performance of 2D lead-free perovskite NCs.
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Small
·
2023
·Vol. 19
·期 47
·2303885
·
IF 13.3
Yuhao Li,Minchao Qin,Yunfan Wang,Shiang Li,Zhaotong Qin,Sai-Wing Tsang,Chun-Jen Su,Yubin Ke,Xinhui Lu
The black-to-yellow phase transition in perovskite quantum dots (QDs) is more complex than in bulk perovskites, regarding the role of surface energy. Here, with the assistance of in situ grazing-incidence wide-angle and small-angle X-ray scattering (GIWAXS/GISAXS), distinct phase behaviors of cesium lead iodide (CsPbI 3 ) QD films under two different temperature profiles–instant heating-up (IHU) and slow heating-up (SHU) is investigated. The IHU process can cause the phase transition from black phase to yellow phase, while under the SHU process, the majority remains in black phase. Detailed studies and structural refinement analysis reveal that the phase transition is triggered by the removal of surface ligands, which switches the energy landscape. The lattice symmetry determines the transition rate and the coexistence black-to-yellow phase ratio. The SHU process allows longer relaxation time for a more ordered QD packing, which helps sustain the lattice symmetry and stabilizes the black phase. Therefore, one can use the lattice symmetry as a general index to monitor the CsPbI 3 QD phase transition and finetune the coexistence black-to-yellow phase ratio for niche applications.
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 17
·5098-5110
·
IF 7
Yangwen Hou,Man Dong,Jingting He,Jing Sun,Chunyi Sun,Xiao Li,Xinlong Wang,Zhongmin Su
All-inorganic perovskite (CsPbBr3) nanocrystals (NCs) are exceptional candidates for photocatalysis due to their optimal band structure, high molar extinction coefficient, and long charge-carrier diffusion lengths. However, their inevitable instability and low charge transfer efficiency have prevented their widespread applications. A strategy that can improve both stability and charge separation efficiency is desperately required. Herein, by introducing an in situ structural transformation strategy, hydrophobic hierarchically porous CsPbBr3@Pb-MOF is obtained which exhibits high durability in water for more than 7 weeks and appealing thermal stability and resistance to anion intrusion. Meanwhile, abundant oxygen vacancies are detected which efficiently suppress the photogenerated charge recombination. As a result, impressive CO2 photoreduction activity is achieved with CsPbBr3@Pb-MOF as a catalyst. Through a gas–solid reaction (without sacrificial agents and photosensitizers), this CsPbBr3@Pb-MOF-2 composite exhibits a CO yield of 107 μmol g−1 h−1 with 99.2% selectivity under visible-light (λ > 420 nm) irradiation, surpassing most reported CsPbX3-based photocatalysts under similar conditions.
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Biomedical Materials
·
2023
·Vol. 18
·期 5
·055024
·
IF 4
Lihong Qiao,Xiaoxia Li,Chuanqi Wei,Zhongjun Li,Shisong Han,Du Cheng
Chemodynamic therapy (CDT) is a rising technology for cancer therapy by converting intracellular hydrogen peroxide (H2O2) into hydroxyl radical (•OH) via transition-metal-containing nanoparticles (NPs) catalysis reaction (i.e. Fenton reaction) to kill tumor cells. Highly efficient Fenton reaction and favorable delivery of the catalytic NPs 'nanoenzyme' are the key for successful treatment of cancer. In this work, we developed a novel nanoenzyme MnFe2O4@GFP for in vitro and in vivo antitumor therapy. A new MnFe2O4 nanoparticle containing two transition-metal-element Fe and Mn was synthesized for enhanced Fenton reaction and used to co-deliver protein with high biocompatibility through post-modification with dopamine polymerization, green fluorescent protein adsorption, and PEG coating. The enrichment of H2O2 and glutathione (GSH) in tumor tissue provided a favorable microenvironment for in situ generation of toxic free radicals. Fe3+ and GSH triggered a redox reaction to produce Fe2+, which in turn catalyzed H2O2 into •OH, with the consumption of antioxidant GSH. By combining Fe3+ with another catalyzer, the catalytic efficiency of the nanoenzyme were greatly improved. Consequently, the nanoenzyme showed efficient antitumor ability both in vitro and in vivo. Thus, the multifunctional CDT nanoenzyme platform shows great promising for antitumor therapy through the combination of catalyzers Fe3+ and Mn2+ and codelivery of protein cargo.
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Advanced Optical Materials
·
2023
·
IF 9
Bing Tang,Shixun Wang,Haochen Liu,Nanli Mou,Arsenii S. Portniagin,Peigang Chen,Ye Wu,Xiaoqing Gao,Dangyuan Lei,Andrey L. Rogach
Owing to their attractive optical and chiroptical properties, chiral metal halide perovskites have received increasing attention, with potential applications ranging from photonics and optoelectronics to spintronics. Metal halide perovskite nanocrystals with either intrinsic or extrinsic (e.g., chiral ligand-induced) chirality have been reported recently, and the interplay between these two types of chirality has yet to be addressed. Herein, the inversion and tuning of excitonic optical activity is reported in intrinsically chiral perovskite nanoplatelets, originating from interactions between their structural chirality (due to the spontaneously formed screw dislocations in the crystalline lattice) and the surface enantiomeric (R/S) chiral ligands R/S-phenylethylammonium bromide. Through post-preparative exposure of the perovskite nanoplatelets to these R/S ligands of varied contents, either chiral ligand-induced intrinsic chirality inversion or negative and positive Cotton effects induced by the ligands via electronic coupling between the ligand and the nanoplatelets are identified. These findings deepen understanding of the modulation of excitonic optical activity in chiral perovskites and can guide the rational design and synthesis of novel chiral materials.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Tianyu Zhang,Xiaoli Yan,Guangda Zhou,Kui Wang,Jingtao Zhang,Hua Zhang,Junjie Guo
Optimizing platinum-based catalysts for hydrogen generation via water electrolysis in pH-universal electrolytes is significant, and modulating the electronic structure is a viable strategy. Herein, platinum-iron (Pt–Fe) alloys with varying composition supported on carbon onions (CNOs) were successfully synthesized: Pt x Fe y @CNOs (x, y = 0.6, 0.4; 0.5, 0.5; 0.4, 0.6). Beneficial from the precisely modulated crystal plane spacing and electronic structure by tuning the Pt/Fe composition, in general pH electrolytes, Pt x Fe y @CNOs display outstanding hydrogen evolution reaction (HER) activity. The as-prepared Pt 0.5 Fe 0.5 @CNOs shows low overpotentials (η 10 ) of 11, 30, and 19 mV at −10 mA cm −2 in 0.5 M H 2 SO 4 , 1.0 M phosphate-buffered saline (PBS), and 1.0 M KOH electrolyte, respectively. Compared to commercial Pt/C, it displays enduring stability up to 24 h. Density functional theory (DFT) calculations indicate that Pt 0.5 Fe 0.5 @CNOs displays the lowest H* Gibbs free energy (ΔG H* ) and water dissociation energy values, due to the suitable proton adsorption and H 2 O dissociation processes offered by its electronic structure. Moreover, it is proven that the support with better wettability has a positive effect on HER performance of the catalyst. The optimal electronic structure and improved wettability provide novel insight into developing a Pt-based HER pH-universal catalyst.
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