ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Abubakar Yakubu Haruna,Yubo Luo,Zheng Ma,Wang Li,Haiqiang Liu,Xin Li,Qinghui Jiang,Junyou Yang
The thermoelectric performance of n-type Bi2Te3 needs further enhancement to match that of its p-type Bi2Te3 counterpart and should be considered for competitive applications. Combining Cu/Cl and multiscale additives (AgBiSe2) presents a suitable route for such enhancement. This is evidence of the enhanced thermoelectric performance of Bi1.995Cu0.005Te2.69Se0.33Cl0.03. Moreover, by incorporating 0.65 wt % AgBiSe2 (ABS) into Bi1.995Cu0.005Te2.69Se0.33Cl0.03, we further reduce its lattice thermal conductivity to ∼0.28 W m–1 K–1 at 353 K owing to the extra phonon scattering of multiscale ABS. Additionally, the Seebeck coefficient enhances (−183.89 μV K–1 at 353 K) owing to the matrix’s reduced carrier concentration caused by ABS. As a result, we achieve a high ZT of ∼1.25 (at 353 K) and a high ZTave of ∼1.12 at 300–433 K for Bi1.995Cu0.005Te2.69Se0.33Cl0.03 + 0.65 wt % ABS. This work provides a promising strategy for enhancing the thermoelectric performance of n-type Bi2Te3 through Cu/Cl doping and ABS incorporation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lingyao Zou,Lu Gan,Wenli Song,Chunying Rong,Lishan Yang,Liping Yu,Zhongyun Ma,Shixun Lian
The rapid development of highly durable electric vehicles has put forward higher requirements for lithium-ion batteries. Li 4 Ti 5 O 12 (LTO) is widely studied owing to its long service life and safety. However, owing to their low electrical conductivity and diffusion, lithium ions have limited practical applications. In this study, Co-Cl co-doped LTO/TiO 2 diphase (LTOT) nanosheets were prepared via the hydrothermal method . The synergistic effect of Co-Cl co-doping reduced the charge-transfer resistance of LTOT and increased the lithium-ion diffusion coefficient , thereby improving the dynamic behavior of the electrode material, which further enhances the rate capability and cycle performance of LTOT. The optimized LTOT:Co-Cl composite exhibited excellent cycle performance and rate capability (the ninth cycle reversible capacities were 253.8, 222.2, 200.1, 185.7, 169.9, 161.3, and 146.3 mAh·g −1 at the current density of 1, 2, 5, 10, 20, 30, and 50 C (1 C = 175 mA·g −1 ) rate, respectively). In addition, LTOT:Co-Cl maintained a capacity of 120 mAh·g −1 after 5000 cycles at 50 C with a retention rate of 83 %, indicating that the average decay rate per cycle is only 0.003 % during the long charge/discharge process.
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Frontiers in Chemistry
·
2023
·
IF 5.5
Zhang Chen,Wang Minqiang,Shi Jindou,Wang Junnan,Da Zheyuan,Zhou Yun,Xu Youlong,Gaponenko Nikolai V.,Bhatti Arshad Saleem
The inherent single narrow emission peak and fast anion exchange process of cesium lead halide perovskite CsPbX3 (X = Cl, Br, I) nanocrystals severely limited its application in white light-emitting diodes. Previous studies have shown that composite structures can passivate surface defects of NCs and improve the stability of perovskite materials, but complex post-treatment processes commonly lead to dissolution of NCs. In this study, CsPb(Cl/Br)3 NCs was in-situ grown in TiO2 hollow shells doped with Eu3+ ions by a modified thermal injection method to prepare CsPb(Cl/Br)3/TiO2:Eu3+ composites with direct excitation of white light without additional treatment. Among them, the well-crystalline TiO2 shells acted as both a substrate for the dopant, avoiding the direct doping of Eu3+ into the interior of NCs to affect the crystal structure of the perovskite materials, and also as a protection layer to isolate the contact between PL quenching molecules and NCs, which significantly improves the stability. Further, the WLED prepared using the composites had bright white light emission, luminous efficiency of 87.39 lm/W, and long-time operating stability, which provided new options for the development of perovskite devices.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Daqin Chen,Junni Li,Xiao Chen,Jiangkun Chen,Jiasong Zhong
Currently, metal halide perovskite nanocrystals have been extensively explored due to their unique optoelectronic properties and wide application prospects. In the present work, a facile grinding method is developed to prepare whole-family APbX3 (A = MA, FA, and Cs; X = Cl, Br, and I) perovskite nanocrystals. This strategy alleviates the harsh synthesis conditions of precursor dissolution, atmosphere protection, and high temperature. Impressively, the as-prepared perovskite nanocrystals are evidenced to have halogen-rich surfaces and yield visible full-spectral emissions with maximal photoluminescence quantum yield up to 92% and excellent stability. Additionally, the grinding method can be extended to synthesize widely concerned Mn2+-doped CsPbCl3 nanocrystals with dual-modal emissions of both excitons and dopants. As a proof-of-concept experiment, the present perovskite nanocrystals are demonstrated to be applicable as blue/green/red color converters in UV-excitable white-light-emitting diodes.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ji Ying Long,Zhi Shuo Yan,Yun Gong,Jian Hua Lin
Based on a meta-organic framework (MOF) formulated as [Co 4 (phen) 4 Cl 8 ] (phen = 1, 10-phenanthroline) as precursor, Cl/O doped C/CoO material (C/CoO-200) was synthesized by a one-step calcining method at a low temperature of 200 °C. In C/CoO-200, CoO nanoparticles with an average size of 25 nm were linked by carbon matrix into particles with the diameter of 200 nm ∼ 1 μm. The sample possessed a very low atomic percentage of CoO (CoO: 1.9%; C: 86.8%) due to the large amount of carbon from the organic ligand, phen in the precursor. However, it still exhibited a large specific capacitance of 1052 F g −1 at 0.5 A g −1 in 2 M KOH electrolyte with a 79.6% capacitance retention at 10 A g −1 . After successive etched in acid, Cl/O doped carbon nanoparticles were obtained. C-300 was composed by individual nanoparticles with size of 100–500 nm, it showed a specific capacitance of 207 and 164 F g −1 in 2 M KOH at a current density of 0.5 and 1 A g −1 , respectively, which was comparable to the commercial activated carbon (AC) (199 and 179 F g −1 for AC at 0.5 and 1 A g −1 , respectively). An asymmetric supercapacitor based on the positive electrode of C/CoO-200 and the negative electrode of C-300 exhibited a stable performance with a 61% retention of specific capacitance after 10,000 charging-discharging cycles at 1.5 A g −1 .
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JOURNAL OF MOLECULAR LIQUIDS
·
2016
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IF 2.74
Yong Zhou,Yongli Huang,Zengsheng Ma,Yinyan Gong,Xi Zhang,Yi Sun,Chang Q. Sun
A combination of the differential Raman spectrometrics and contact-angle measurements has enabled resolution of the hydrogen bond (HB, O:H O) relaxation and molecular dynamics in the NaX hydration shells. Observations suggest that the aqueous ions create each an electric field to form the hydration shells through O:H O bond elongation and polarization. The ionic polarization shares the same, and even stronger, effect of molecular undercoordination that shortens the H O bond and stiffen its phonon , and meanwhile, the O O Coulomb repulsivity lengthen and soften the O:H nonbond with an association of polarization. O:H O bond electrification raises not only the structure order of molecules and the viscosity in the hydration shells but also the skin stress and thermal stability of the solution. Exercises not only deepen our insight into the salt solute-solvent interaction involved in the Hofmeister series in terms of O:H O bond electrification but also provide a powerful means quantifying the dynamic, local, molecular-site-resolved information regarding the O:H O bond cooperativity in aqueous solutions.
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Materials Today
·
2025
·
IF 22
Jikai Zhang,Yi Tao,Yuxuan Ye,Haiyang Wang,Xinping Wu,Zicheng Luo,Yu Shi,Qi Zhao,Zongju Cheng,Yu Guo,Bin Li,Bo Mai,Qinyou An,Xiansheng Zhang,Zhiguo Du,Shubin Yang
Although 2D transition-metal carbides (MXenes) are usually synthesized by selective etching and chemical vapor deposition approaches, they are limited by the slow reaction kinetics, resulting in their continuous production challenging. Here, we demonstrate a bubbling chemical vapor growth (BCVG) method to continuously produce Cl-terminated MXenes by the reaction of CH 4 and TiCl 4 chemical bubbles with titanium powder in a molten salt. In the molten reaction system, titanium powder would effectively react with TiCl 4 to form highly active [TiCl 6 ] y – with low Ti Cl bond dissociation energies. The multivalent [TiCl 6 ] y – could efficiently incorporate the carbon species from CH 4 to form [Ti 6 CCl 18 ] clusters on the surface of bubbles in a low energy barrier, efficiently promoting the reaction kinetics. Subsequently, Cl-terminated MXenes were produced based on the following condensation reaction of [Ti 6 CCl 18 ] clusters. The resultant MXene (Ti 2 CCl x ) exhibits an expanded structure with strong interfacial polarization between its basal planes and the polymer matrix, delivering a good electromagnetic wave absorption performance with a minimum reflection loss (RL min ) value of –52.2 dB at a thin thickness of 2.84 mm.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Qiong Liu,Chengbo Bai,Die He,Xueting Wu,Yiping Wu,Rong Chen
Surface defects in semiconductors play a significant role in modulating the performance of photocatalytic reactions. However, there is still insufficient exploration regarding the influence of defects on the photocatalytic CO 2 reduction performance. In this study, we achieved controllable construction of oxygen vacancies (OVs) in BiOX (X=Cl, Br) samples through one-step solvothermal treatment in polyols by adjusting the reaction time. The introduction of OVs significantly enhanced the photocatalytic activity of BiOX (X=Cl, Br) for converting CO 2 to CO. Among all the tested BiOX (X=Cl, Br) samples with OVs, BiOCl-OV-2 and BiOBr-OV-2 samples with a moderate amount of OVs exhibited the highest CO yield of 28.51 and 15.22 μmol g cat −1 after 4 hours of irradiation, respectively. Photo-/electrochemical measurements results revealed that engineering OVs into BiOX (X=Cl, Br) effectively adjusted their electronic structure, charge density and separation; however, excessive OVs may slightly degrade their photoelectrochemical properties and thus lead to reduced photocatalytic activity. Furthermore, an appropriate amount of OV was found to enhance both CO 2 adsorption capacity and photo-generated electron reduction ability, thereby further promoting the overall efficiency of photocatalytic CO 2 conversion. Through in situ FTIR spectra analysis, we uncovered the process of photocatalytic conversion from CO 2 to CO.
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ACS Catalysis
·
2024
·
IF 11.3
Yang Yu,Wei Zhou,Xiaohan Zhou,Junshu Yuan,Xuewei Zhang,Lijie Wang,Jingyu Li,Xiaoxiao Meng,Fei Sun,Jihui Gao,Guangbo Zhao
Limited by the violent oxidation and corrosion environment of the oxygen evolution reaction (OER) in seawater electrolysis, the design of catalysts with high activity and stability is crucial for improving the hydrogen production performance of the electrolysis cell. Herein, we report taking advantage of corrosive Cl– in seawater to achieve rapid surface reconstruction of amorphous NiFeCoP for stable seawater splitting. The successful introduction of pulse current and P constructs Cl– adsorption active sites to optimize the d-band center and induce the formation of NiFeCo(OH). Density functional theory calculations also verified that NiFeCo(OH) has satisfactory OER activity and chlorine exclusion properties. Benefiting from the electronic structure and reaction intermediate adsorption, NiFeCo(OH) only requires 255.3 mV overpotential to reach a current density of 100 mA cm–2. Meanwhile, the assigned alkaline water electrolysis cell (NFCP || Pt/C) stably operates for 320 h in natural seawater at an industrial current density of 500 mA·cm–2 with a low voltage of 1.806 V. The seawater AEM electrolyzer (NFCP || Pt/C) achieves an improved performance of high activity (2.095 V@500 mA·cm–2) and stable operation (100 h@500 mA·cm–2) to achieve economic seawater splitting. In summary, this work proposes a fast self-reconstruction of a high-performance seawater electrocatalyst for marine hydrogen energy.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Xiaoming Xu,Zhiwei Wang,Guoyan Hua,Sunxinyi Wang,Yuxuan Chen,Zepeng Zhang,Fuqiang Liu,Pengrui Jin,Huanting Wang
Nanofiltration (NF) technology is crucial in alleviating global water scarcity through desalination. Overcoming the permselectivity trade-off to improve both the permeance and rejection of polyamide (PA) nanofiltration (NF) membranes beyond the log–log upper bound remains a significant scientific challenge. Herein, we explored advanced ion-transport barriers by constructing a chitin-assisted PA NF membrane, incorporating a biomass-derived carboxylated chitin nanofiber (CO-ChNF) interlayer that simultaneously modulates the pore architecture and surface charge of the PA layer. CO-ChNFs, sustainably extracted from squid cartilage and featuring rich carboxyl and amino functionalities, effectively suppressed the diffusion kinetics of amine monomers during interfacial polymerization. The engineered CO-ChNF/PA membranes demonstrated a sharper pore size distribution and an enhanced charge density, providing an ideal platform to systematically investigate the mechanisms behind ion sieving at PA microinterfaces by exploring ion dehydration energy and electrostatic repulsion energy. Leveraging the enhanced transport barriers, the optimal CO-ChNF/PA membrane achieved impressive performances with a permeance of up to 31.4 L m–2 h–1 bar–1 and a superior Cl–/SO42– selectivity of 91.3, surpassing most commercial and reported NF membranes. This work sheds light on the regulatory mechanism of the chitin-assisted interfacial polymerization reaction and introduces an innovative approach for efficient Cl–/SO42– sieving.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Sheng Lv,Liangcheng Song,Yanling Xu,Hongyan Cui,Chongqiang Zhu,Chunhui Yang
The development of high-performance infrared (IR) nonlinear optical (NLO) crystals with ultra-wide bandgaps (>4.0 eV) is crucial for advancing laser technologies, yet achieving a balance between wide bandgaps and strong NLO responses remains challenging. A trivalent aliovalent substitution strategy is reported in this work to engineer diamond-like (DL) halides, CuAlX4 (X = Cl, Br), which simultaneously achieve record-wide bandgaps (4.25 eV for CuAlCl4 and 4.09 eV for CuAlBr4), high laser-induced damage threshold (LIDT) values (46.2 MW cm−2 and 33.9 MW cm−2, respectively), and competitive second-harmonic generation (SHG) coefficients (3.52 pm V−1 and 7.12 pm V−1 at 2.09 μm, respectively). Structural characterization and first-principles calculations reveal that the introduction of Al3+ induces asymmetric [CuX4] tetrahedra and cationic vacancies, breaking inversion symmetry and enhancing hyperpolarizability. The synergistic effects of increased valence electron concentration and optimized tetrahedral alignment result in exceptional optical properties, including broad transparency and type-I phase-matching behavior. This work demonstrates the potential of high-valence substitution for designing DL halides with ultra-wide bandgaps and robust NLO performance, offering new insights for IR optoelectronic applications.
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Water
·
2025
·Vol. 17
·期 17
·2563
·
IF 3
Chao Feng,Tongyu Liu,Yongping Shi,Jimin Shen,Lei Yuan,Yuanqing Guo
The interaction of disinfectants with bromide/iodide ions and natural organic matter (NOM) generates brominated/iodinated disinfection byproducts (Br/I-DBPs), known for their heightened cytotoxicity and genotoxicity relative to chlorinated DBPs. This study investigated Br/I-DBP formation during sodium hypochlorite (NaClO) disinfection of lignin-containing synthetic water by quantifying adsorbable organic halogens (AOX) and trihalomethanes (THMs). Disinfection of bromide-containing water yielded a bromide ion (Br−) to adsorbable organic bromine (AOBr) conversion rate of approximately 60%, with bromine within THMs accounting for about 30% of the total AOBr, indicating significant brominated DBP formation where THMs represent a major fraction. Conversely, iodide ion (I−) conversion to adsorbable organic iodine (AOI) is minimal, suggesting negligible iodinated DBP formation under NaClO disinfection. Examination of key parameters revealed that brominated THM (Br-THM) formation decreased with increasing lignin concentration, while iodinated THM (I-THM) formation increased. The effect of chlorine dose differed: Br-THM formation exhibited an initial increase followed by a decrease at higher doses, whereas I-THM formation consistently decreased. Both Br-THM and I-THM formation increased with higher bromide or iodide ion concentration and with increasing pH. These results highlight the distinct pathways and influencing factors governing brominated versus iodinated DBP formation in lignin-containing waters disinfected with hypochlorite.
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