JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yang Yang,Honghao Deng,Liying Liu,Jiahong Pan,Ping Chen,Zhicong Shi
O3-type Cu/Fe/Mn-based layered oxides are regarded as promising cathode materials for sodium-ion batteries due to the abundance of elements in the Earth's crust and the imperative for large-scale energy storage. However, these materials still encounter some challenges, including low capacity and insufficient rate performance. In this study, Al-doped, cobalt-free, and nickel-free Na 0.9 Cu 0.18 Fe 0.3 Mn 0.52-x Al x O 2 (x = 0, 0.03, 0.05, 0.08) are successfully synthesized by using the solid-state method to introduce non-electrochemically active elements to stabilize the crystal structure and enhance the electrochemical performance. The impact of Al-doping is comprehensively analyzed by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), galvanostatic intermittent titration technique (GITT), and electrochemical impedance spectroscopy (EIS). Al-doping effectively enhances the diffusion coefficient of Na + , reduces the Jahn-Teller effect caused by Mn 3+ and mitigates the transition from O3 to P3 phase. Finally, it stops the partial phase transitions from O3 to P3, which can be found in pristine oxide without Al-doping during charge-discharge cycling. Notably, the Na 0.9 Cu 0.18 Fe 0.3 Mn 0.47 Al 0.05 O 2 electrode exhibits a reversible capacity of 123.89 mAh g −1 at 0.1 C, a capacity retention rate of 91.1 % after 200 cycles at 1 C, and a discharge capacity of 66.36 mAh g −1 at a high rate of 5 C.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 30
·1-12
·
IF 2.8
Ding Feng,Li Jiaying,Wang Jiacheng,Wu Tengyan,Liu Xin,Yang Zeliang
Nano magnetic particles immobilized on the surface of carbon spheres ( M Fe 2 O 4 /CNS, M = Mn, Ni, Zn) composites have been obtained through a facile and environmental friendly solvothermal method. The measurement results of M Fe 2 O 4 /CNS clarified the successful preparation of M Fe 2 O 4 /CNS and characterization of composites. Meanwhile, the activation performance of M Fe 2 O 4 /CNS was also measured through catalyzing persulfate (PS) for degrading Rhodamine B. Results showed that the catalytic performance of M Fe 2 O 4 /CNS for PS activation was much stronger than that of pure CNS, and the catalytic ability of M Fe 2 O 4 /CNS was MnFe 2 O 4 /CNS > NiFe 2 O 4 /CNS > ZnFe 2 O 4 /CNS. The influence factors of Rhodamine B degradation were also investigated. When the optimum conditions were conducted, with PS 5 × 10 –3 M, MnFe 2 O 4 /CNS 0.5 g/L, initial pH 6.0, and 60 °C, 98.4% Rhodamine B degradation was obtained within 70 min. Finally, the recycle of MnFe 2 O 4 /CNS was carried out for four times, which demonstrated the favorable retrievability and reusability of MnFe 2 O 4 /CNS. The experiments also proved that the synthesized MnFe 2 O 4 /CNS was a potentially useful catalyst for contaminants degradation in water/wastewater treatment.
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高影响因子
Journal of the American Chemical Society
·
2025
·
IF 15.6
Mingyan Chuai,Hao Tong,Zimin Yang,Siting Deng,Mingqiang Wu,Jidan Xing,Guoliang Chai
An electrolytic Zn–MnO2 battery is highly valued due to its cost-effectiveness, environmental friendliness, and abundant resource availability. However, the battery’s performance is hindered by the slow kinetics at the poorly conductive MnO2 cathode and hydrogen evolution at the Zn anode. Here, a strategy of P–O–M (M = Mn, Zn) d-pπ backbonding design is proposed for phosphorus–oxygen electrolyte additives, which can be realized by tuning the atomic dipole moment-corrected Hirshfeld (ADCH) population charge of the P/O atom. The reversibility of d-pπ backbonding not only leads to the fast kinetics of Mn2+/Zn2+ at electrodes during both charge and discharge processes to suppress the competitive hydrogen evolution reaction but also enhances the electronic conductivity at the electrode–electrolyte interfaces to sustain the high areal capacity of batteries. Hydroxymethyl dimethyl phosphite (HPD) with d-pπ backbonding is a preferred additive with a suitable ADCH charge. The assembled electrolytic Zn–MnO2 (HPD) battery exhibits a high discharge capacity of 14.05 mAh cm–2 at an areal capacity of 15 mAh cm–2 and superior cycling stability over 1500 cycles. The Zn–MnO2 (HPD) soft-pack battery exhibits a discharge capacity of over 1.60 Ah at a discharge rate of 0.5 C and maintains a Coulombic efficiency of ∼80% over 100 cycles. Furthermore, the assembled 50 V 40 Ah commercial Zn–MnO2 (HPD) battery can drive an electric vehicle for 10 km. The ADCH charge regulation provides a feasible and effective method for developing high-performance aqueous batteries by achieving d-pπ backbonding.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yadong He,Shi Tang,Mengting Hua,Pi Wang,Yuandong Li,Rao Fan,Ling Li
n dye-sensitized solar cells (DSSCs), the counter electrodes (CEs) functions both as an electron collector from the peripheral circuitry and as a catalytic platform for regenerating the redox couple (I − /I 3 − ) in the electrolyte. Although Pt offers excellent catalytic activity, its high cost and instability limit practical use. Transition metal oxides are promising Pt alternatives but have low conductivity and inadequate catalytic performance. Here, we synthesized a cactus-like Mn-Co-Ni oxide composite on carbon paper (MnCoNiO/CP) via a two-stage process combining hydrothermal treatment with subsequent annealing. The hierarchical structure provided a high specific surface area (67.753 m 2 ·g −1 ), abundant active sites, and enhanced conductivity. The MnCoNiO/CP-based DSSCs exhibited a photovoltaic performance characterized by an open-circuit voltage (V oc ) of 0.807 V, short-circuit current density (J sc ) reaching 17.86 mA·cm −2 , and fill factor (FF) attaining 0.7, culminating in an overall power conversion efficiency (PCE) of 10.04 %. This corresponds to a 34.8 % enhancement in PCE compared to the Pt electrode (7.45 %) under identical conditions. The performance improvement directly correlates with the unique cactus-like morphology and the synergistic effects of the multi-component oxides. This work introduces a cost-effective strategy for developing enhanced-functionality CEs in DSSCs and other applications.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuangjiang He,Junchang Wang,Chong Wang,Xiao Zhang,Sen Liang
The Mn-Fe-Co-Zn-O series is a widely used thermistor material, but its thermal stability is compromised by nitrogen glass encapsulation, limiting its application in electrical devices. To address this issue, La 2 O 3 and Y 2 O 3 were used as rare earth oxide dopants, and xR 2 O 3 -Mn 0.76 Fe 0.87 Co 1.07 Zn 0.3 O 4 (x = 0.0025, 0.005, 0.01, 0.02) negative temperature coefficient (NTC) materials were synthesized via solid-state sintering. The effect of rare earth doping on the electrical properties after high-temperature nitrogen annealing was investigated. After annealing at 750°C for 4 h, the variation in resistivity ( ρ 25 ) and material constant ( B 25/50 ) significantly decreases with increasing La doping. For the La-doped sample (x = 0.01), Δρ 25 decreased to 7.77% and ΔB 25/50 to 0.77% (for the Y-doped sample (x = 0.01), Δρ 25 decreased to 22.76% and ΔB 25/50 to 1.91%), compared to the undoped sample, where Δρ 25 reduced by 168.84% and ΔB 25/5 0 by 5.57%. This improvement was attributed to rare earth accumulation at grain boundaries, filling voids and forming R-O bonds, which inhibited oxygen vacancy migration and significantly reduced grain boundary resistance. Rare earth doping effectively improved the thermal stability and electrical consistency of NTC thermistor ceramics in high-temperature nitrogen atmospheres, offering a new strategy for high-temperature encapsulation applications. (Y-doped samples showed similar results, as detailed in the Supplementary Materials.)
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Tian-Li Meng,Jia-Wei Wang,Ying-Xia Ma,Xin-Quan Chen,Lei Lei,Jing Li,Fen Ran
Layered double hydroxide (LDH), as an electrode material, consists of positively charged layers and interlayer hydrated anions and is endowed with promising prospects in supercapacitors (SCs) due to its large specific surface area, tunable metal ions, abundant redox active sites, and low cost. Moreover, metal-organic frameworks (MOFs) exhibit adjustable pore sizes, while multi-walled carbon nanotubes (MWCNTs) boast exceptional electrical conductivity. Hence, in this work, flower-like nickel/manganese layered double hydroxide (Ni/Mn-LDH) was introduced into nanohybrid of MWCNTs decorated with nickel metal-organic frameworks (Ni-MOFs/MWCNTs) to fabricate a novel Ni-MOFs/MWCNTs@Ni/Mn-LDH nanohybrid as electrode material for SCs using a two-step solvothermal method. In the composite structure of the novel Ni-MOFs/MWCNTs@Ni/Mn-LDH nanohybrid, the flower-like assembly of Ni/Mn-LDH nanosheets was seamlessly integrated with MWCNTs adorning the Ni-MOFs, creating an interconnected hierarchical porous network. This distinctive structure, coupled with the synergistic effects of its components, facilitated the swift diffusion of electrolyte ions. Furthermore, it enhanced the accessibility to more active sites at the interfaces during the redox process, thereby contributing considerably to an improved electrochemical performance. The specific capacity of the Ni-MOFs/MWCNTs@Ni/Mn-LDH nanohybrid as electrode material obtained at the optimal experimental conditions was 1151.0C g −1 at 1.0 A g −1 . The assembled asymmetric supercapacitor (ASC) had an energy density of 25.6 Wh kg −1 at a power density of 845.3 W kg −1 . The fabrication strategy of the Ni-MOFs/MWCNTs@Ni/Mn-LDH could be extended to synthesize other nanohybrid.
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Kaiyun Zhang,Wenxiu He,Fanyan Zeng,Yuhe Huang,Taiyang Wang,Meilan Xie,Dui Ma,Yang Pan
Addressing the kinetic mismatch and structural instability challenges in sodium-ion hybrid capacitor (SIHC) anodes, this study develops an N-doped carbon composite integrating amorphous Mn–S with adjacent low-nucleated MnS (a–Mn-S/MnSLN@NC). This architecture synergistically enhances mechanical stress buffering and charge transfer kinetics via the isotropic dynamic bonding of a–Mn-S and the high-affinity sites of MnSLN. The 3D C–S–Mn covalent bonds in the a–Mn-S stabilize MnSLN through atomic anchoring, homogenizing volume strains and exposing uncoordinated S active sites to elevate Na+ adsorption density. Theoretical calculations reveal that the proximity-induced d–p orbital hybridization reconstructs the electron-donor characteristics of S sites, creating an asymmetric electronic configuration. The electron-rich a–Mn-S serves as efficient Na+ trapping centers, while the electron-deficient MnSLN facilitates rapid electron transfer. This configuration endows the composite with superior Na+ adsorption energy and charge transfer efficiency over pure MnS. Consequently, the a–Mn-S/MnSLN@NC anode delivers a high reversible capacity of 597 mAh g–1 at 0.1 A g–1 and retains 90.5% capacity after 3500 cycles at 10.0 A g–1. The assembled SIHCs achieve exceptional energy/power densities (186 Wh kg–1 and 9576 W kg–1). This work elucidates the mechanism of adjacent asymmetric configurations for enhanced Na+ storage, offering a novel strategy for designing high-performance SIHCs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhiping Yan,Xin Wang,Ruiding Fei,Ruixue Zhu,Jianfeng Zhao,Wenchao Wang
Developing a highly effective solar-to-H 2 conversion system is a promising strategy for carbon neutrality. Here, we report a chemically bonded Z-scheme photocatalyst by specifically linking the conduction band site of ZnIn 2 S 4 with the valence band site of Mn 0.3 Cd 0.7 S 1-x . Deviates from the typical van der Waals interactions between two semiconductors, the in-built robust binding force (Mn-S bond) and charge transfer channel facilitates the electron mobility, minimizes detrimental deep charge trapping, and prolongs the active charge lifetime from 983 ps to 4250 ps. The sulfur vacancies in Mn 0.3 Cd 0.7 S 1-x are partially refilled by atoms of the same element in ZnIn 2 S 4 during the in-situ formation of heterojunctions, which promotes and solidates the establishment of interfacial chemical bonds. The optimal photocatalyst achieves a high quantum efficiency of 32.71 % at 420 nm. This study offers a new insight into the development of Z-Scheme heterojunctions via a synergistic approach involving doping, vacancy filling and strong interfacial chemical bonds.
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高影响因子
Catalysts
·
2026
·Vol. 16
·期 10
·891
·
IF 4.5
Tianyi Sheng,Xiaodan Zhang,Jiaxin Ma,Yanguang Chen
Coke deposits on the inner walls of furnace tubes during the steam cracking process can significantly reduce heat transfer efficiency and ethylene yield. This study designed a series of Co-Mn-based perovskite catalysts with tunable molecular structures, morphologies, and pore structures to achieve in situ and efficient coke removal. This research evaluated the catalytic performance of these catalysts as coke models in the graphite gasification reaction. The optimal synthesis parameters for SrCo1−xMnxO3(SCM-x) were determined through the sol–gel method. Specifically, the Mn doping content was x = 0.1, citric acid was used as the complexing agent, pH = 3, and calcination was performed at 800 °C, which produced a cubic perovskite structure with a porous, flake-like morphology. Under the optimized reaction conditions (catalyst and graphite particle sizes of 140–150 and 160–180 mesh, 900 °C, 10 wt.% catalyst loading, water flow 0.167 mL·min−1, 120 min), SCM-0.1 achieved a graphite conversion of 64.78%, which around 18 times higher than that without catalyst. The results of XRD, XPS, H2O-TPD, in situ DRIFTS, SEM, and UV analyses revealed that Mn doping increased oxygen vacancy concentration, enhanced oxygen mobility and bound-water adsorption, and promoted the formation of ·OH radicals from water vapor, which effectively accelerates the gasification of graphite. These findings demonstrate the potential of Mn-doped SrCoO3perovskites as an anti-coking coating material for ethylene cracking furnaces.
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高影响因子
DESALINATION
·
2024
·
IF 8.3
Xuehan Xiao,Zongxue Yu,Juan Wang,Shiyi Luo,Yan Huang,Dingmei Han,Junchen Li,Zhiquan Chen,Jie Wang,Minggang Huang
The long-term and efficient treatment of shale gas wastewater is an inevitable tendency. This study employed the SEP@Fe-Mn/RGO composite membrane series for the membrane separation treatment of shale gas wastewater. Different proportions and different function of SEP@Fe-Mn/RGO composite membranes were obtained through the method of electrostatic self-assembly. This study researched the “Trade-off” issue of membranes separation through the analysis，resulting in membranes that best meets the separation requirements for shale gas wastewater. After two membrane separation, The oil-water separation efficiency (COD 2040 mg/L and TOC 487.14 mg/L) of shale gas wastewater was >99.3 %. The removal rate of the main salt component (Na 2 SO 4 ) reached 83.56 %, and the removal rate of major heavy metal ions (Fe 3+ , Cr 3+ , Ba 2+ ) was above 60 %. Because of the continuous generation of in-situ bubbles by the reaction of MnO 2 with H 2 O 2 , and Fenton reactions on the membrane, which further accelerated the separation of pollutants. In a variety of harsh water environments, this membrane series remained stable within 12 h. Simple to prepare, cost-effective, low in energy consumption, and environmentally friendly, which makes it promising for wide applications in the field of petroleum water treatment.
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 25
·8502-8506
·
IF 7.059
Lu Hou,Yihua Zhu,Jingrun Zhu,Yiqin Gong,Chunzhong Li
Mn-doped 2D perovskite powders are promising phosphors for warm white light-emitting diodes (LEDs). However, it remains a challenge to solve the problem of lead toxicity and improve the photoluminescence quantum yields (PLQYs). Here, we have successfully prepared Mn-doped 2D Sn-based perovskite materials ((C8H17NH2)2Sn1−xMnxBr4). The PLQYs of (C8H17NH2)2Sn1−xMnxBr4 (x = 0.26) powders reach up to 42%. The as-prepared (C8H17NH2)2Sn1−xMnxBr4 exhibits a single broad photoluminescence (PL) band, differing from the dual peaks of Mn-doped lead halide perovskite quantum dots. Theoretical conclusions and experimental results show the competitive relationship between self-trapped exciton (STE) emission from the host crystal and dopant Mn d–d transition emission. With increasing Mn dopant concentration, the PL spectra exhibit red shifts and the full width at half-maximum (FWHM) becomes larger, which is constructive for warm white LEDs. The fabricated warm white LEDs based on (C8H17NH2)2Sn1−xMnxBr4 show a warm white light correlated color temperature (CCT; 3542 K) and a high color-rendering index (Ra, 88.12). Our work provides new possibilities for optoelectronic devices based on lead-free perovskite materials.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Lin Sun,Yu Liu,Qingjun Yang,Fangrong Yan,Xiaoying Liu,Changhong Wang,Runmei Luo,Weidong Shi
Exploiting the theoretical capacity of transition-metal selenide (TMSe) electrodes with improving stability is a challenge in hybrid supercapacitors (HSCs). An in-situ strategy of multidirectional recombination of reasonable/stable hierarchical structure and multiphase synergy is proposed to boost TMSe electrodes to a higher level. Herein, trimetallic layered double hydroxides (CoNiMn-LDH) are in-situ reconstructed with hollow CNFs (carbon–nitrogen frameworks), which can expose numerous active sites and facilitates rapid charge transport. After systematic selenization (time gradient), the valence-rich multiphase (Co, Ni, Mn)-Se@CNFs is regulated and the hierarchical structure is further optimized with reduction of layer spacing for rapid charge transfer and OH – adsorption. The multiphase coordinated electrode demonstrates a high capacity (334.7 mAh g −1 , 1 A g −1 , 6 M KOH) and superior rate capability (277.8 mAh g −1 , 10 A g −1 , 83.0%). Besides, the assembled HSC demonstrates a quite high energy density ((Co, Ni, Mn)-Se@CNFs//Activated carbon, 91.6 Wh kg −1 at 800 W kg −1 ). The ultra-high cycle retention rate (without attenuation, 16,000 cycles) illustrates the excellent stability, which is superior to the HSCs we know that use TMSes. The in-situ strategy with systematic research on structure/phase regulation provides effective ideas for the preparation and application of high-capacity electrodes and high-efficiency HSCs.
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高影响因子
危险品化学品经营许可证（带存储）