JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Hongfang Jiu,Na Ren,Lixin Zhang,Qing Zhang,Yuying Gao,Yajuan Meng
The flower-like ZnMn 2 O 4 hollow microtubules were synthesized by a hydrothermal method and calcination method. The composition and morphology were characterized. The results showed that flower-like hollow microtubules were obtained through calcination treatment. The as-prepared ZnMn 2 O 4 electrochemical properties of flower-like hollow microtubules anode material for lithium-ion batteries were investigated. The first charge and discharge capacity was measured at 2152/1263 mA h g −1 when the current density at 400 mA g −1 . After 300 cycles, the capacity kept 515 mA h g −1 corresponding to the coulombic efficiency of 99%, which exhibited preferable cycling performance. The stability of the structure has been shown by rate performance, which had been tested under different current density. The results suggest a promising application of the ZnMn 2 O 4 as anode material for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Lijun Liu,Wenya Tang,Lu-Yang Zuo,Hui-Tao Fan,Bo Li,Liya Wang
Semiconductor photocatalytic hydrogen evolution (PHE) has emerged as a feasible solution to address the problem of energy shortage. Hydrogen energy can thus be developed by creating a photocatalyst with a high activity for producing hydrogen and an effective charge transfer route. This study describes the preparation of innovative hierarchical ZnMn2O4@ZnIn2S4 (ZMOZ) ball-in-ball hollow microspheres as photocatalysts using a straightforward solvothermal technique. Remarkably, the PHE rate of the 10% ZMOZ can reach 11.12 mmol h–1 g–1, it roughly 4.9 greater than pure ZnIn2S4 (ZIS). Aside from the benefits of building heterojunctions, the regulation of morphology such as hollow structures that can provide more exposed active sites and enhance the light-absorption capability by internal multilight scattering. Through the use of density functional theory calculations (DFT), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra as well as time-resolved PL (TRPL) spectroscopy also demonstrate that the charge separation efficiency in the composite was notably improved. This work offered a cost-effective and environmentally friendly method for utilizing visible light to construct an effective PHE.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 1
·172
·
IF 3.9
Yandong Xu,Jianjun Liao,Linlin Zhang,Yakun Li,Chengjun Ge
Rational design of composite nanostructured photocatalytic systems with good sunlight absorption capacity and efficient charge separation and transfer ability is an urgent problem to be solved in photocatalysis research. Here, a ZnMn2O4decorated three-dimensional carbon nitride with O, C co-doping, and nitrogen defect composite photocatalytic system was prepared using a simple hydrothermal method and subsequent calcination method. For the photocatalytic reactions, the presence of heterostructures, C, O co-doping, and nitrogen defects greatly promotes the separation and transfer of charges at the semiconductor/semiconductor interface under the local electric field, thereby extending its service life. The photocatalytic degradation efficiency of sulfamethoxazole in water is as high as 94.3% under the synergistic effects, which is also suitable for the complex water environment. In addition, the synthesized photocatalyst has good chemical stability and recyclability. This study provides a new opportunity to solve the problem of environmental pollution.Keywords:multi-defective C3N4;ZnMn2O4;composite system;photocatalytic sulfamethoxazole degradation
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2024
·Vol. 96
·期 2
·e10984
·
IF 2.5
Xinchao Ruan,Huan Wang,Fengyun Huang,Fanye Wang,Xiaojun Yang
In this study, a highly efficient peroxymonosulfate (PMS) activator, ZnO/ZnMn 2 O 4 , was synthesized using a simple one-step hydrothermal method. The resulting bimetallic oxide catalyst demonstrated a homogenous and high-purity composition, showcasing synergistic catalytic activity in activating PMS for degrading 2, 4-dichlorophenol (2, 4-DCP) in aqueous solution. This catalytic performance surpassed that of individual ZnO, Mn 2 O 3 , and ZnMn 2 O 4 metal materials. Under the optimized conditions, the removal efficiency of 2, 4-DCP reached approximately 86% within 60 min, and the catalytic ability remained almost constant even after four cycles of recycling. The developed degradation system proved effective in degrading other azo-dye pollutants. Certain inorganic anions such as HPO 4 − , HCO 3 − , and NO 3 − significantly inhibited the degradation of 2, 4-DCP, while Cl − and SO 4 2− did not exhibit such interference. Results from electrochemical experiments indicated that the electron transfer ability of ZnO/ZnMn 2 O 4 surpassed that of individual metals, and electron transfer occurred between ZnO/ZnMn 2 O 4 and the oxidant. The primary active radicals responsible for degrading 2, 4-DCP were identified as SO 4 •− , OH • and O 2 •− , generated through the oxidation and reduction of PMS catalyzed by Zn (II) and Mn (III). Furthermore, X-ray photoelectron spectroscopy (XPS) analysis of the fresh and used catalysts revealed that the exceptional electron transfer ability of ZnO facilitated the valence transfer of Mn (III) and the transfer of electrons to the catalyst's oxygen surface, thus enhancing the catalytic efficiency. The analysis of radicals and intermediates indicates that the two main pathways for degrading 2, 4-DCP involve hydroxylation and radical attack on its aromatic ring. Practitioner Points A bimetallic ZnO/ZnMn 2 O 4 catalyst was synthesized and characterized. ZnO/ZnMn 2 O 4 can synergistically activate PMS to degrade 2, 4-DCP compared with single metal oxide. Three primary active radicals, O 2 •− , • OH, and SO 4 •− , were generated to promote the degradation. ZnO promoted electron transfer among the three species of Mn to facilitate oxidizing pollutants. Hydroxylation and radical attack on the aromatic ring of 2, 4-DCP are the two degradation pathways.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Houde She,Suyue Cao,Jiufu Chen,Xiaoping Chen,Jingwei Huang,Lei Wang,Qizhao Wang
High indoor formaldehyde levels from residential decorations pose a pressing environmental concern, underscoring the urgency for effective catalytic degradation strategies. In this study, a La-doped ZnMn 2 O 4 catalyst with an oxygen-rich vacancy was successfully synthesized via a straightforward hydrothermal method. The experimental findings demonstrate that the L 0.5 ZMO catalyst, with a La doping amount of 0.5 mmol, exhibits a remarkable 100 % efficiency in degrading formaldehyde. Structural and spectroscopic analyses reveal that La doping in ZnMn 2 O 4 induces significant lattice expansion and an increased proportion of Mn 3 + species, both of which synergistically enhance the catalytic oxidation performance at room temperature. DFT results show that La doping concentrates the charge density near the Fermi energy level, significantly altering the charge distribution. This facilitates electron transfer, leading to enhanced photocatalytic performance. Furthermore, the introduction of oxygen vacancies generates abundant active sites, substantially improving the formaldehyde decomposition efficiency. This study highlights the critical role of La incorporation in modulating oxygen vacancies and surface properties of ZnMn 2 O 4 , yielding a cost-effective catalyst for efficient indoor formaldehyde abatement under ambient conditions.
研究领域:
环境科学
·
材料化学
·
催化
·
纳米技术
·
室内空气质量
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 6
·956-966
·
IF 3.552
Ni Qingzhuo,Cheng Hao,Ma Jianfeng,Kong Yong,Komarneni Sridhar
A ZnMn 2 O 4 catalyst has been synthesized via a sucrose-aided combustion method and characterized by various analytical techniques. It is composed of numerous nanoparticles (15–110 nm) assembled into a porous structure with a specific surface area (SSA) of 19.1 m 2 ·g −1 . Its catalytic activity has been investigated for the degradation of orange II dye using three different systems, i.e., the photocatalysis system with visible light, the chemocatalysis system with bisulfite, and the photochemical catalysis system with both visible light and bisulfite. The last system exhibits the maximum degradation efficiency of 90%, much higher than the photocatalysis system (15%) and the chemocatalysis system (67%). The recycling experiments indicate that the ZnMn 2 O 4 catalyst has high stability and reusability and is thus a green and eximious catalyst. Furthermore, the potential degradation mechanisms applicable to the three systems are discussed with relevant theoretical analysis and scavenging experiments for radicals. The active species such as Mn(III), O 2 •− , h + , e aq − , SO 4 •− and HO • are proposed to be responsible for the excellent degradation results in the photo-chemical catalysis system with the ZnMn 2 O 4 catalyst.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2024
·Vol. 15
·期 7
·828
·
IF 3
Ji Li,Yu Wang,Xinyuan Pei,Chunhe Zhou,Qing Zhao,Ming Lu,Wenjuan Han,Li Wang
The ZnMn2O4/V2CTxcomposites with a lamellar rod-like bond structure were successfully synthesized through high-temperature calcination at 300 °C, aiming to enhance the Li storage properties of spinel-type ZnMn2O4anode materials for lithium-ion batteries. Moreover, even though the electrode of the composites obtained at 300 °C had a nominal specific capacity of 100 mAh g−1, it exhibited an impressive specific discharge capacity of 163 mAh g−1after undergoing 100 cycles. This represents an approximate increase of 64% compared to that observed in the pure ZnMn2O4electrode (99.5 mAh g−1). The remarkable performance of the composite can be credited to the collaborative impact between ZnMn2O4and V2CTx, leading to a substantial improvement in its lithium ion storage capacity. Therefore, this study offers valuable insights into developing cost-effective, safe, and easily prepared anode materials.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 5
·050530
·
IF 4.386
Kexing Cai,Shao-Hua Luo,Jun Cong,Kun Li,Sheng-xue Yan,Peng-qing Hou,Qing Wang,Yahui Zhang,Xin Liu
As one of the multivalent ion batteries, the zinc ion battery has the advantages of high-volume energy density and good safety. In this paper, coral-like and nanoparticle crosslinking hierarchical nanostructured ZnMn2O4/Mn2O3 composites were successfully synthesized as cathode materials for zinc ion batteries by a simple sol-gel combined with the zinc-absent method. ZnMn2O4/Mn2O3 composites with good properties were prepared when the zinc content was 10%. The prepared ZnMn2O4/Mn2O3 composites have the morphology of coral-like and nanoparticle crosslinking and uniform particle size distribution. Compared with pure ZnMn2O4 and Mn2O3, the composites show excellent electrochemical properties. Using 0.5 M Zn(CF3SO3)2-AN/H2O (8:2) as the electrolyte, the first discharge capacity of the material can reach 170.7 mAh·g−1 at 0.05 C. After 150 cycles, the discharge capacity remained 109 mAh·g−1. The kinetic characteristic of the electrode was studied by the galvanostatic intermittent titration technique, and the electrochemical reaction mechanism was studied by ex situ XRD. It was found that the two-phase recombination improved the diffusion rate of Zn2+. In the field of aqueous zinc ion batteries, an effective modification idea is provided for the research of spinel ZnMn2O4 cathode material with low specific capacity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2019
·
IF 0
Lijing Yan,Xiaomin Zeng,Zeheng Li,Xiangjuan Meng,Di Wei,Tiefeng Liu,Min Ling,Zhan Lin,Chengdu Liang
Graphite was reported by J.O. Besenhard as the reservoir for alkali ions in 1974. The booming period of lithium-ion batteries arrived after the graphite patent issued by Sony Co. in 1991. The flourish development is due to the address of lithium dendrite issue through the substitution from lithium metal to graphite. Currently, the zinc dendrite formation in zinc-ion batteries is one of the major issues. Herein, we fabricate a zinc-ion full battery by replacing zinc metal with organic quinone , which is a zinc dendrite free material. This novel zinc-ion full battery exhibits excellent cycling stability with capacity retention of 94.4% and high specific capacity of 189.5 mA h g −1 after 500 cycles. Ascribed to the low cost of quinone and long cycle performance, this work could inaugurate a new era for rechargeable aqueous zinc-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
CHEMICAL PHYSICS LETTERS
·
2026
·
IF 2.9
Guangling Zuo,Hongyong Ye,Xingda Zhang,Rong Wang,Jia Du,Xin Ding
Photocatalytic hydrogen evolution represents a promising strategy for sustainable energy conversion, yet its efficiency is often limited by the rapid recombination of photogenerated carriers and insufficient redox capabilities. In this work, an S-scheme ZnMn 2 O 4 /CdO (ZMO/CdO) heterojunction was successfully fabricated via a simple solvothermal method to address these challenges. Based on band structure analysis, the composite satisfies the thermodynamic prerequisites for photocatalytic hydrogen evolution. The establishment of an S-scheme charge transfer pathway, driven by the combined effect of an internal electric field (IEF) and band bending, enables photogenerated electrons (e − ) to accumulate in the conduction band (CB) of ZnMn 2 O 4 (ZMO), while holes (h + ) are retained in the valence band (VB) of CdO. This mechanism not only promotes the spatial separation of photogenerated electron–hole pairs (PEHP) but also preserves the strongest redox ability of the system. Under optimized conditions (pH = 8 with triethanolamine (TEOA)), the ZMO/CdO composite achieves an outstanding hydrogen evolution rate of 2237 μmol∙g −1 ∙h −1 , which is approximately 4.38 and 2.84 times higher than that of pure CdO and ZMO, respectively. Moreover, the photocatalyst maintains high hydrogen production activity and structural stability in diverse real water samples, including municipal water, natural surface water, and even wastewater, highlighting its strong potential for practical solar-driven hydrogen production in complex environments.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Fang Zhu,Jianfeng Ma,Qiuyue Ji,Hao Cheng,Sridhar Komarneni
A special catalytic system was obtained by using ZnMn 2 O 4 (ZMO) materials to activate Na 2 S 2 O 8 and catalytically degrade organic dye orange II under visible light irradiation. The ZMO nanoparticles were prepared by a simple one-step method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS). In this study, the ZMO/Na 2 S 2 O 8 system was used to degrade orange II, and the degradation rate reached 97.44% in 60 min. ZMO catalysts could be recycled for at least five times, and its degradation rate was only decreased by 1.84%. The free radicals produced during the degradation of orange II were studied by classical quenching experiments, and the different types of free radicals produced in the system were further confirmed by electron paramagnetic resonance (EPR) spectroscopy. The catalytic degradation of orange II in this system was mainly caused by the production of superoxide , sulfate and hydroxyl radicals, which achieved high degradation.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zi'ang Quan,Kaiqiang Zheng,Juan Liu,Yingbo Zang,Di Gao,Meng Cui
In this work, we introduce a dual approach, combining defect engineering with fiber reinforcement, for the first time, to simultaneously improve the structural stability and transport kinetics of ZnMn 2 O 4 (ZMO) in aqueous zinc-ion batteries (AZIBs). Incorporating fluorine into the ZMO lattice successfully introduces a high concentration of oxygen vacancies, enhancing Zn 2+ diffusion and electron conductivity while optimizing the electronic structure. At the same time, straw cellulose nanofibers (SCNFs), derived from agricultural corn stalk waste, were co-assembled with carbon nanotubes (CNT) to prepare a straw cellulose nanofibers@carbon nanotubes (SCNFs@CNT) flexible conductive film that serves dually as a robust loading platform and a continuous conductive network for the microspheres. The fabricated ZMO/CNT-F cathode achieved a high specific capacity of 534.7 mAh·g −1 (0.53mAh·cm −2 ) at 0.5 A·g −1 and retained 224.5 mAh·g −1 (0.22mAh·cm −2 ) after 4000 cycles under a high current density of 3 A·g −1 , highlighting its outstanding long-term cycling stability. First-principles calculations showed that fluorine doping leads to bandgap narrowing, charge density localization, and bond length elongation, all contributing to reducing the diffusion energy barrier. This study presents valuable perspectives on defect and interface engineering for AZIB cathodes and introduces an eco-friendly method for repurposing agricultural waste.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）