JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Guoshuai Wang,Huiyun Wei,Yanhong Luo,Huijue Wu,Dongmei Li,Xinhua Zhong,Qingbo Meng
CdSe x Te 1−x alloyed colloidal quantum dots show great potential application on quantum dot-sensitized solar cells (QDSCs) due to its relatively wide light absorption range and high chemical stability. In this respect, a thin Mn modified CdSe layer is introduced into TiO 2 /CdSe x Te 1−x alloyed QDs surface via a simple chemical bath deposition method (CBD) in order to further improve the cell performance. The power conversion efficiency of CdSe x Te 1−x QDSCs has been improved to 8.14%. Detailed investigation on the influence of this modification toward the TiO 2 /CdSe x Te 1−x interface on the cell performance reveals that introduction of Mn into CdSe QDs is found to facilitate the Mn-doped CdSe deposition and improve the light absorption of the device. In the meantime, the existence of the (Mn-)CdSe layer can also work as a passivation layer to reduce charge recombination.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jicheng Rui,Ning Deng,Yiying Zhao,Chen Tao,Jizhi Zhou,Zhenzhen Zhao,Xin Huang
Considerable interest has been focusing on the activation of peroxydisulfate (PDS) by layered double hydroxide (LDH) for degradation of organic pollutants . However, understanding the structure and chemistry of LDH by which the activation of PDS could achieve a high degradation efficiency of organic compounds is an unsolved and fundamental question in advanced oxidation processes (AOPs), and one which, if harnessed, could enable the rational design of LDH with desired material properties. In this work, Mg/Al-LDH was synthesized with variable structures and compositions through doping different proportions of Mn 2+ . We advanced to understand this question of how LDH by these characteristics can affect the activation of PDS for degradation of organic pollutants. At a relatively low dosage of Mn (˂ 1%) in Mg/Al-LDH, the degradation rate of phenol by LDH activated PDS increased with the increase content of Mn, which was achieved by an increase of catalytic sites in Mg/Al-LDH interlayer. Rather, higher content of Mn (˃ 1%) significantly lowered the degradation performance of phenol as the decrease of interlayer space resulted in reduction of PDS intercalation in LDH and the formation of secondary Mn-related minerals (i.e., Mn 3 O 4 ) led to meaningless consumption of PDS. Finally, the degradation of phenol by LDH activated PDS followed a non-radical ( 1 O 2 ) mechanism. Our ability to quantify how the chemical and structural variability of LDH influence the activation of PDS for organic degradation could mark an important step toward synthesis strategies for advanced catalysts.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Chunxia Wu,Hongxiang Zhang,Shouzhi Wang,Wei Wang,Jun Dai
In this paper, we report a simple one-pot strategy to synthesize highly stable SiO 2 -coated orange-yellow CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots with strong orange-yellow photoluminescence . The microstructure characterization indicates that the CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots were effectively encapsulated by the SiO 2 . The SiO 2 -coated CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots show higher humidity stability and thermal stability than the CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots without SiO 2 coating. The white light-emitting diodes (WLEDs) were obtained by coating orange-yellow CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 @SiO 2 and blue CsPbBrCl 2 @SiO 2 quantum dots on the ultraviolet gallium nitride light-emitting diode chip. The as-prepared white light-emitting diodes show bright white light emission with a color coordinate of (0.3347, 0.2825), color rendering index of 82 and correlated color temperature of 5329 K. The results provide a simple method to fabricate stable orange-yellow luminescent material for white light-emitting diodes.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Li Lv,Yinglin Wang,Pengfei Cheng,Yue Zhang,Yaoqiong Zhang,Zhaohui Lei,Luping Xu,Zhi Weng
In this study, a one-step chemical vapor deposition (CVD) method was used, utilizing template NaCl and dextrin as the porogen and structural support. The synthesized spinel MFe 2 O 4 (M = Zn, Ni, Cu, Co and Mn) microspheres with multiple cavities structure were applied to the acetone gas sensor detection. Through the characterization of the sensitive materials, the average pore diameter of the microspheres was about 60 nm. Compare with other metal cations , when M = Zn or Ni, the MFe 2 O 4 samples revealed the super gas sensitivity at working temperatures of 250 °C and 175 °C, and the response values to 100 ppm acetone were 25 and 24.3, respectively. In addition, they also exhibited excellent selectivity and long-term stability to acetone. The excellent gas sensitivity of ZnFe 2 O 4 and NiFe 2 O 4 could be attributed to the replacement of Fe with Zn and Ni ions to obtain a higher Fe 3+ /Fe 2+ atomic ratio, thereby increasing the content of adsorbed oxygen. In summary, the gas sensing performance of spinel MFe 2 O 4 oxide had been systematically studied by replacing Fe with other transition metals. The iron-containing spinel oxides are expected to be promising sensing material for gas sensors due to their rich elements and excellent activity.
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高影响因子
GREEN CHEMISTRY
·
2025
·Vol. 27
·期 17
·4540-4550
·
IF 9.2
Yang Zhao,Ruguang Wang,Jisi Li,Jiaxin Guo,Quanlu Wang,Zheng Lv,Pengfei Yin,Tao Ling
Single-atom catalysts towards the oxygen reduction reaction (ORR) often suffer from unsatisfactory activity and poor stability. Herein, for the first time, we successfully modulated the electronic structure of the Mn–N–C catalyst by introducing chalcogen oxygen groups (XO2, X = S, Se, Te), which induce changes in the Mn–N bond length in the MnN4 structure, thereby modulating the electronic structure of the metal center Mn. The experimental results demonstrate that the introduction of XO2 groups results in the rearrangement of Mn 3d electrons, which can be strongly correlated with the ORR activity of the Mn–N–C catalysts, among which the SeO2 modification increases the kinetic current density of the Mn–N–C catalyst achieving a half-wave potential (E1/2) of 0.79 V versus the reversible hydrogen electrode, approaching that of Fe–N–C catalysts along with significant stability in acidic media. The promising performance of the Mn–N–C catalyst as a PGM-free cathode was confirmed through fuel cell testing. First-principles calculations demonstrate that the introduced XO2 group downshifts the d-band center of the Mn center, thus successfully optimizing the adsorption of oxygen intermediates. This finding significantly facilitates the activity enhancement of Mn–N–C catalysts via the construction of a geometric structure–electronic structure–catalytic property relationship.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ayaz Muzammil,Rizwan Haider,Wenrui Wei,Lin Li,Liang Wu,Yi Fan,Xianxia Yuan
The development of highly efficient oxygen evolution reaction (OER) electrocatalysts is pivotal to enhance the performance of alkaline water electrolyzers. Herein, a facile two-step electrodeposition method is developed for the fabrication of nitrogen-doped carbon (NC) and manganese-incorporated NiFe layered double hydroxides (LDHs) supported on Ni foam (NF). When evaluated in 1.0 M KOH solution, the optimized material of NC20-Mn-NiFe LDH showed excellent OER performance requiring low overpotentials of 298 and 331 mV to achieve high current densities of 500 and 1000 mA cm–2, respectively, and no loss in current density was observed at fixed potentials of 1.53 and 1.57 V for 125 h in each case. This performance is not only better than that of the state-of-the-art RuO2/NF but also most of the recently reported LDH-based catalysts. Such a remarkable performance is mainly attributed to the vertical growth of NC20-Mn-NiFe LDH sheets on NF, facilitated electron transfer and charge density modulation on the active metal sites due to the electron-withdrawing and electron-donating effects of NC and Mn, respectively, resulting in the shift of the rate-determining step from OOH* formation to O2 desorption with decreased free energy. This research work provides further insights into modulating the structure of LDH-based materials to achieve a high OER performance delivering industrial-level current densities at low overpotentials.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 52
·期 1
·1122-1131
·
IF 5.6
Yuyu Chen,Weiliang Li,Jingyu Zhang,Xiaomin Cheng,Jiaojie Xiao,Kaiwen Zhou,Wenwei Wu,Xuehang Wu
The practical application of O3-type layered oxide cathode materials in sodium-ion batteries is limited by their insufficient structural stability and poor interfacial compatibility, especially under high-voltage operation. In this work, a thin Y 2 O 3 coating is applied to the surface of Na 0.9 Cu 0.12 Ni 0.33 Mn 0.42 Ti 0.13 O 2 (CNMT). During high-temperature annealing, partial diffusion of Y 3+ ions into the CNMT lattice results in an expansion of the interlayer spacing within the sodium layer and a reduction in lattice oxygen vacancies. Owing to the stabilized Y 2 O 3 -modified interface and improved structural integrity, the CNMT modified with 2 wt% Y 2 O 3 (CNMT-2Y) demonstrates superior cycling performance in the voltage range of 2.2–4.3 V. Specifically, in a half-cell configuration, CNMT-2Y delivers an initial discharge capacity of 130.9 mAh g −1 and maintains 94.35 % of its capacity after 100 cycles at a current density of 100 mA g −1 . After being exposed to ambient air for 10 days, the material still retains 89.62 % of its capacity over 100 cycles under the same conditions, significantly outperforming the pristine CNMT (83.54 %). In a full-cell setup with hard carbon (HC) as the anode, CNMT-2Y provides an initial discharge capacity of 119.5 mAh g −1 and retains 77.14 % of its capacity after 150 cycles at 100 mA g −1 within 1.5–4.2 V. This facile dual-modification strategy shows promising potential for promoting the commercialization of O3-type layered oxide cathode materials.
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Jie Zheng,Ying Li,Yongtao Huang,Zezhong Wang,Wei Zhang,Chunsheng Zhuang
The well-matched thermal expansion coefficient between YBa0.95K0.05Co4O7+δ and electrolyte materials makes it a highly promising electrode for proton-conducting solid oxide fuel cells (H-SOFCs). However, its limited electrochemical performance hampers the enhancement of the cell power density. In this study, we significantly improved the oxygen reduction reactivity and electrochemical properties of YBa0.95K0.05Co4O7+δ by introducing transition metal dopants (Mn/Fe/Ni/Cu/Zn) at the Co site, with a doping concentration of x = 0.05. Experimental results indicate that Mn doping yields the most substantial performance enhancement. Transition metal doping modulates the material’s band gap structure and conductivity, with Mn doping narrowing the band gap and enhancing conductivity by 105%. Conductivity relaxation tests further confirm that Mn doping accelerates oxygen ion transport, reducing the relaxation time. X-ray photoelectron spectroscopy analysis shows that the oxygen vacancy concentration in the Mn-doped systems increases by 72%. Symmetric cell tests reveal that Mn doping reduces cathodic polarization impedance by 33% at 700 °C, while Fe, Ni, and Zn doping results in varying impedance increases due to competitive mechanisms. The peak power density of a single cell with the Mn-doped cathode reaches 657 mW cm–2 at 700 °C, surpassing the 531 mW cm–2 obtained with the undoped sample. This work demonstrates the efficacy of a multielement doping strategy to optimize SOFC electrode materials, offering an approach for their design.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
Yaxiong Zeng,Jie Yu,Beimeng Qi,Fang Tao,Xiaotian Yang,Yulin Wang,Xiaoguang Duan,Hailu Fu
Regulating the microenvironment of single-atom catalysts (SACs) is critical for steering ozone (O 3 ) activation toward selective on-demand reactive species generation. While first-shell coordination engineering modulates the center metal activity, it often disrupts the robust Mn-N 4 symmetry and thus compromises structural stability. Here, we developed atomically dispersed Mn-N 4 -S sites (S-MnN 4 ) that feature sulfur doping in the second coordination shell for catalytic ozonation and water pollutant degradation. Second-shell sulfur incorporation subtly elevated the d -band center and increased the spin state of Mn from low to intermediate, enhancing O 3 adsorption, dissociation and the preferred generation of high-valent Mn(IV)=O species. Consequently, S-MnN 4 achieved a 2.7-fold higher ozone utilization efficiency and double the turnover frequency versus pristine MnN 4 which catalyzed O 3 to primarily yield singlet oxygen. A continuous-flow system using a S-MnN 4 -packed column reactor demonstrated efficient chemical oxygen demand removal and exceptional durability over 170 h for the treatment of real-world wastewater. This work highlights second-shell coordination engineering as a feasible approach to overcome SAC activity-stability trade-off, advancing rational SAC design toward a sustainable environmental remediation.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Huihui Liu,Yiping Wang,Jun Chen,Kai Xia,Ying Yang
High-power piezoelectric ceramics require both a high piezoelectric coefficient and a large vibration output. Yet, simultaneous optimization remains challenging because of the intrinsic coupling between polarization activity and mechanical loss. Here, Mn/Nb ratio engineering was applied to 0.9 Pb(Zr 0.5 Ti 0.5 )O 3 -0.1 Pb(Mn 1/3 Nb 2/3 )O 3 -0.01Co 3 O 4 -0.001Fe 2 O 3 (PZT-PMN) ceramics to regulate phase structure and electromechanical properties. An optimized R3m/Cm/P4mm multiphase coexistence was achieved through composition tuning, together with regulated grain growth and polarization behavior. At a Mn/Nb ratio of 0.4, the ceramic exhibits a superior piezoelectric coefficient ( d 33 = 420 pC/N), electromechanical coupling factor ( k p = 0.62), and mechanical quality factor ( Q m = 1608), along with stable d 33 variation <5% from 25 to 275 °C and a maximum vibration velocity of 0.57 m/s, exceeding that of commercial PZT4 under identical conditions. The enhanced performance is associated with the coupled regulation of defect chemistry, phase coexistence, and domain-wall dynamics. A composition-driven strategy for balancing piezoelectric activity and high-power output in PZT-based ceramics is identified.
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高影响因子
Separations
·
2026
·Vol. 13
·期 6
·163
·
IF 3.5
Jingyi Wang,Yu Zhang,Lingen Zhang
Spent lithium-ion battery electrolytes contain fluorine-, sulfur-, and phosphorus-bearing toxins, necessitating deep detoxification and directional conversion into C1–C6light hydrocarbons. To elucidate the specific catalytic roles and sequential activation of cathode metals (Li, Ni, Co, Mn), this work systematically deconvolutes their mono- and multi-metallic migration mechanisms over a CaO-ZSM-5* catalyst during vacuum catalytic pyrolysis (530 °C, 100 Pa). Results reveal that Li+and Ni2+dominate C–O bond cleavage in carbonates and CaO-ZSM-5*-assisted decarboxylation and oxygen fixation, significantly increasing the relative hydrocarbon content. Conversely, Co2/3+and Mn4+release reactive oxygen species, causing deep oxidation of hydrocarbons into CO2and antagonizing the targeted conversion. In multi-metallic systems, forming composite metal oxides (MxNyOz) increases the energy barrier for releasing active catalytic ions, hindering carbonate cleavage and leaving unreacted carbonate feedstocks. For detoxification, F and P are effectively immobilized as CaF2and Ca2P2O7. The relative content of detected gas-phase nitriles is minimized to <2% due to the strong antagonistic effect of Ni2+on Li+-promoted hexanedinitrile cleavage, while sulfur species derived from 1,3-propane sultone are converted to SO2and ultimately mineralized as calcium and metal-sulfur salts. Mechanistically, product distributions and crystallographic properties suggest a hypothesized sequential activation model—Li+→ Ni2+→ Mn4+—governing reactivity, whereas Co2/3+does not participate in the synergistic detoxification and selective upgrading process. This migration–reaction coupling framework provides critical insights for cathode-assisted in situ catalytic pyrolysis and closed-loop electrolyte recycling.
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 9.2
Siyuan Zheng,Bolin Li,Jun Wang,Shanshan Huang,Simiao Wu,Zihang Wang,Guoliang Bai
Levofloxacin (LEV) residues in water are refractory and ecotoxic, while heterogeneous catalytic ozonation (HCO) systems suffer from limited efficiency and insufficient anti-interference ability. To address this, a composite catalyst, Co–Mn/CTS@NZ, was fabricated by loading Co–Mn bimetallic oxides onto chitosan-modified natural zeolite through wet impregnation–calcination to target non-radical reactive oxygen species (ROS) regulation in HCO for enhanced LEV degradation and anti-interference. Under the optimized conditions (LEV 30 mg/L, O 3 5 mg/L, catalyst 5 g, pH 6.5), the system achieved 99.55% LEV removal and 55.52% mineralization in 60 min, outperforming single ozonation significantly. The catalyst exhibited excellent anti-interference performance and operated efficiently across various real water matrices, with negligible metal leaching. Quenching experiments and electron paramagnetic resonance confirmed that 1 O 2 was the primary ROS, with ·O 2 − and ·OH acting as supplementary radicals. Characterization revealed that abundant oxygen vacancies, metal valence cycles, and surface hydroxyl groups synergistically promoted ozone activation and targeted ROS generation. This study provides a low-cost, high-efficiency catalyst for LEV-contaminated water treatment and offers a theoretical basis for targeted ROS regulation in HCO technology—breaking the reliance of traditional HCO on ·OH and advancing the practical application of advanced oxidation in antibiotic pollution control.
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高影响因子
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