JOURNAL OF POWER SOURCES
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2025
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IF 7.9
Zhiyong Yang,Guofang Zhang,Ruiqin Zhang,Lu Bai,Shilong Sun,Yiming Li,Zhuocheng Liu,Feng Hu,Jianyi Xu,Ruihua Guo,Yanghuan Zhang
The BaCe 0.98 M 0.02 O 3 (M = Ce, Y, Li, Mn, Ni) solid solution was successfully synthesized via a combustion method. The microstructure and spectra characteristics were analyzed systemically. The X-ray diffraction (XRD) results showed that the structures of the BaCeO 3 -based materials kept cubic perovskite single-phase structure. The findings from the Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses revealed that the doped samples exhibited smaller grain sizes and the doped elements are distributed uniformly. The spectral analyses revealed that the doped samples contain higher contents of oxygen vacancies in the lattices. The electrochemical hydrogen storage characteristics of the samples demonstrated that the doped samples possess greater discharge capacities compared to pure BaCeO 3 . The Y-doped sample demonstrated superior electrochemical performance, delivering a remarkable specific capacity of 377 mA h/g (hydrogen content of 4.56 %) with excellent capacity retention of 371 mA h/g after 50 cycles. Moreover, the incorporation of Y ions not only significantly enhanced the rate capability but also effectively suppressed the self-discharge behavior. The hydrogen storage mechanism was speculated. The characteristics of hydrogen storage are significantly influenced by the lattice parameters, the concentration of oxygen vacancies and defects, as well as the nature of the doped ions.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Mei Wang,Lei Yang,Zesheng Wang,Liying Jiang
A novel N-MLG@Ni–Mn LDH/Cys electrode was constructed for Cu²⁺ detection in sweat. • Dual active sites significantly enhance Cu²⁺ adsorption and signal amplification. • The sensor exhibits a wide detection range and a low detection limit for Cu²⁺. • The synergistic effect of N-MLG and Ni–Mn LDH improves electrochemical performance. In this study, a highly sensitive electrochemical sensor based on a N-MLG@Ni-Mn LDH/Cys nanocomposite was fabricated for the detection of trace Cu²⁺ in sweat. Nitrogen-doped multilayer graphene (N-MLG) was electrostatically self-assembled with nickel-manganese layered double hydroxide (Ni-Mn LDH) via their charge complementarity, forming a uniform heterostructure. L -cysteine (Cys) was further introduced as a surface modifier to construct the N-MLG@Ni-Mn LDH/Cys nanocomposite-based electrochemical sensor. Based on the hard-soft acid-base (HSAB) theory, a synergistic adsorption mechanism involving dual active sites was established, which significantly enhanced the preconcentration efficiency and specific recognition ability toward copper ions. Electrochemical measurements were performed using square-wave anodic stripping voltammetry (SWASV). Electrochemical characterization demonstrated that the sensor possesses excellent conductivity and good electrochemical activity. Under optimized experimental conditions, the sensor exhibited outstanding analytical performance. A good linear relationship was obtained for Cu²⁺ in the concentration range of 0.1–500 ppb, with a low detection limit of 0.24 ppb. In addition, the sensor prepared by this method showed good anti-interference capability, repeatability, and long-term stability, and it also performed well in the detection of artificial sweat samples. Overall, these performance advantages provide a feasible technical strategy for noninvasive monitoring of Cu²⁺ in sweat, with broad application prospects. An electrochemical sensing platform was constructed for the sensitive detection of Cu²⁺ in sweat based on an N-MLG@Ni-Mn LDH/Cys composite-modified screen-printed electrode (SPE). The electrostatic self-assembly between negatively charged N-MLG nanosheets and positively charged Ni-Mn LDH laminates leads to a stable intercalated heterostructure with high conductivity and abundant active sites. Subsequent functionalization with L-cysteine introduces sulfhydryl (-SH) groups, enabling specific chelation toward Cu²⁺ and enhancing selectivity. During detection, Cu²⁺ is effectively preconcentrated via the synergistic interactions of hydroxyl (-OH) and sulfhydryl (-SH) groups, followed by electrochemical reduction to Cu⁰ under a negative potential. The deposited Cu⁰ is then oxidized during the stripping process, generating a characteristic current signal proportional to the Cu²⁺ concentration. Combined with SWASV, this dual-active-site strategy achieves high sensitivity, excellent selectivity, and reliable analytical performance, demonstrating its effectiveness for trace Cu²⁺ detection in sweat. Download: Download high-res image (221KB) Download: Download full-size image
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ENVIRONMENTAL RESEARCH
·
2026
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IF 8.2
Jianying Huang,Yun Xing,Dechen Kong,Xiaohua Jing
The discharge of pharmaceutical wastewater containing antibiotics and the accumulation of metallurgical solid waste represent two pressing environmental challenges. This study presents a novel “waste-to-resource” solution by molecularly engineering the neutralization slag from vanadium extraction into a Mn-functionalized hydroxyapatite precursor (Mn-HAP-VNR) for enhanced antibiotic removal. Systematic optimization of hydrothermal synthesis identified a condition (pH 7, 0.7 M (NH 4 ) 2 HPO 4 , Ca/Mn=2:1), yielding Mn-HAP-VNR with exceptional Langmuir maximum adsorption capacities of 322.58 mg·g -1 for norfloxacin (NOR) and 214.79 mg·g -1 for tetracycline (TC), significantly outperforming the undoped material and many reported adsorbents. Comprehensive characterization confirmed the successful isomorphous substitution of Ca 2+ by Mn 2+ within the HAP lattice. The introduced Mn 2+ sites were identified as key active sites; based on experimental measurements, Mn doping enhanced the adsorption capacity by over 213% for TC and 628% for NOR compared to undoped HAP. Adsorption isotherms and kinetics were best described by the Langmuir and pseudo-second-order models, respectively, indicating monolayer chemisorption as the dominant mechanism. In-depth spectroscopic analyses (FTIR and Raman) deciphered the distinct chemisorption pathways: NOR primarily coordinates via a bidentate complex between its deprotonated carboxylate group and surface Mn 2+ /Ca 2+ sites, whereas TC engages through synergistic interactions involving its phenolic hydroxyl and ketone carbonyl groups. Thermodynamic studies corroborated the endothermic and spontaneous nature of the process. This work not only demonstrates the superior performance of a waste-derived adsorbent but also elucidates the molecular-level engineering mechanism, establishing a viable closed-loop strategy for the valorization of industrial residue into a high-performance, tailor-made material for targeted water decontamination.
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MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2026
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IF 0.7
Hu Wang,Hua Shi,Pengxiao Guo,Li Sun,Chaochuang Yin,Yinyan Wang,Kang Chen,Yadong Zhou
A new Mn(II) complex, Mn(C36H34N2O8)·2CH3OH (1), containing a sexidentate N2O4 bis-Schiff base ligand, was synthesized and structurally characterized. X-ray analysis revealed that Mn(II) is hexacoordinated by two imine N atoms, two ether O atoms, and two carboxylate O atoms in a distorted octahedral geometry. DFT calculations at the B3LYP/6–311G** level were used to examine atomic charges, frontier molecular orbitals, molecular electrostatic potential, QTAIM, ELF, IRI, and Hirshfeld surfaces, providing detailed insight into its electronic structure. Molecular docking with CT-DNA suggested that the complex may act as a DNA-binding agent with potential biomedical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
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IF 3.99
Hui Liu,Hao Guo,Wenqin Yao,Longwen Zhang,Mingyue Wang,Tian Fan,Wenhu Yang,Wu Yang
MOF-derived hydroxides provide a promising platform for high performance supercapacitors as electrode materials. Herein, a novel manganese-nickel double hydroxide (MnNiDH) composite with special morphology has been successfully prepared by alkalizing the precursor Mn/Ni-MOF-74. Obtaining electrode material inherits the spear-shaped morphology of the precursor well and possesses a smaller particle size by potassium hydroxide treatment. The smaller particle size and rich microporous structure can shorten the ion or proton transport path, thereby improve its electrochemical activity and utilization. Benefiting from these specific properties, the resultant MnNiDH composite demonstrates a high specific capacitance of 2498 F g −1 at a current density of 1A g −1 . The assembled aqueous device exhibits high energy density of 58.53Wh kg −1 , meanwhile the all-solid-state device also displays energy density of 30.63 Wh kg −1 based on the outstanding voltage window of 0∼2.1 V. These results suggest that as-synthesized MnNiDH hold great potential for practical applications in the energy storage field.
研究领域:
材料科学
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储能
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电化学
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纳米材料
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 12
·3059-3067
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IF 2.7
Yin Zihang,He Ruibo,Nie Fei,Wei Zhen,Jia Bo,Feng Qing,Fu Xiaolong,Zhang Wenyan
The oxygen evolution kinetics of industrial copper electrodeposition is slow, resulting in low electrocatalytic activity and high energy consumption. In this work, a quaternary composite of carbon coated active particles containing Mn, Co and Ce were prepared (Mn-Co 3 O 4 /CeO 2 @C), and Ti/Sb-SnO 2 /PbO 2 electrode doped with these active particles was prepared by co-electrodeposition. The microstructure and chemical composition of the electrode was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometry (XRD). Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and Tafel polarization curve (Tafel) were used to study the electrochemical properties of anode materials. The results showed that the doping of Mn-Co 3 O 4 /CeO 2 @C active particles promoted the crystal transition of PbO 2 , decreased the average grain size, and the doping of Ce increases the average valence state of Co. The modified titanium electrode showed excellent catalytic activity of the oxygen evolution reaction (OER) characteristics. The overpotential of the doped Ti/Sb-SnO 2 /PbO 2 anode was only 453 mV when the current density was 20 mA cm −2 in 0.5 M H 2 SO 4 solution, which is 508 mV lower than that of the undoped Ti/Sb-SnO 2 /PbO 2 anode. In simulated copper electro-deposition experiments, the cell voltage was reduced by about 400 mV, compared to the undoped Ti/Sb-SnO 2 /PbO 2 electrode.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qifa Wan,Faming Zhang,Yifeng Xiong,Caiyun Shang
Using a simple and scalable solid-state synthesis process, a series of spinel-structured high-entropy oxides were systematically designed and synthesized in a Co–Mn–Fe–Cr–Ni–Zn–O system. These included (Co,Mn,Fe,Cr) 3 O 4 , (Co,Mn,Fe,Ni) 3 O 4 , (Co,Mn,Fe,Cr,Ni) 3 O 4 , (Co,Mn,Fe,Zn) 3 O 4 , (Co,Mn,Fe,Cr,Zn) 3 O 4 , (Co,Mn,Fe,Ni,Zn) 3 O 4 and (Co,Mn,Fe,Cr,Ni,Zn) 3 O 4 . The phase, microstructure and color evolution of 1/3Co 3 O 4 –1MnO-1/2Fe 2 O 3 -1/2Cr 2 O 3 –1NiO powders were studied without ZnO addition. These underwent four phase evolution processes and three color evolution processes before forming the final phase of black, octahedral (Co,Mn,Fe,Cr,Ni) 3 O 4 powders. The formation of an intermediate phase of (Co,Mn,Fe) 3 O 4 medium-entropy oxide powders served as the foundation for the creation of other high-entropy oxide powders. The infrared radiation properties of these synthesized medium and high-entropy oxides powders were evaluated in the near-infrared region at room temperature. Among these synthesized powders, the infrared emissivity values of (Co,Mn,Fe) 3 O 4 , (Co,Mn,Fe,Ni) 3 O 4 and (Co,Mn,Fe,Cr,Ni) 3 O 4 powders exceeded 0.8. All the synthesized powders exhibited excellent thermal stability after being annealed at high temperatures. Notably, after being annealed at high temperatures, the infrared emissivity values of these synthesized powders increased markedly without degradation, surpassing a value of 0.8, and displayed potential for applications in the field of high-temperature infrared energy savings.
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CHEMOSPHERE
·
2023
·
IF 8.8
Yanye Tian,Yu Li,Guang-Guo Ying,Yong Feng
The extensive presence of organic micropollutants in complex water matrices requires the development of selective oxidation technologies . In this study, a novel selective oxidation process was developed via the conjunction of FeMn/CNTs with peroxymonosulfate and successfully used to remove micropollutants such as sulfamethoxazole (SMX) and bisphenol A from aqueous solutions. FeMn/CNTs were prepared using a facile co-precipitation method, characterized using a series of surface characterization techniques, and then tested for pollutant removal . The results showed that the FeMn/CNTs had much greater reactivity than CNTs , manganese oxide , and iron oxide . The pseudo-first-order rate constant with FeMn/CNTs was more than 2.9–5.7 times that of the other tested materials. The FeMn/CNTs had great reactivity in a wide range of pH values from 3.0 to 9.0, with the best reactivity found at pH values of 5.0 and 7.0. High-valent metal-oxo species such as Fe(IV) O and Mn(IV) O and superoxide anion radicals were determined to be the reactive species and were responsible for the oxidation of SMX. These reactive species were selective; therefore, the overall removal performance of SMX was not obviously influenced by high levels of water components including chloride ions, bicarbonates , and natural organic matters. The results from this study may promote the design and application of selective oxidation technologies for micropollutant abatement.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Qiongqiong Luo,Shaoheng Wang,Dehua Cai,Ning Zhang,Dewen Zeng
A ZnSO4 electrolyte solution with impurity salts such as MnSO4 and MgSO4 is often used in zinc hydrometallurgical processes over a wide temperature range. CaSO4·2H2O(s) scaling and fluorine corrosion are two encountered problems in the process. Understanding the CaF2(s) solubility behavior in MSO4 (M = Zn, Mn, Mg) aqueous solutions at various temperatures helps remove Ca2+ and F– ions from the solution. However, CaF2(s) solubility data, especially at temperatures >298 K, have not been published yet. In this work, CaF2(s) solubilities in the CaF2–CaSO4–MSO4–H2O (M = Zn, Mn, Mg) quaternary systems and its subsystems of the CaF2–MSO4–H2O (M = Zn, Mn, Mg) at 348.15 K and the CaF2–CaSO4–MSO4–H2O (M = Zn, Mg) quaternary systems and the CaF2–MgSO4–H2O ternary system at 298.15 K are systematically measured. The results show that the CaF2(s) solubility in the MSO4 (M = Zn, Mn, Mg) aqueous solution of a certain concentration at 348.15 K is considerably higher than that at 298.15 K. At 298.15 and 348.15 K, the salting-in effect of MSO4 (M = Zn, Mn, Mg) on CaF2(s) solubility is enhanced with the order ZnSO4 < MnSO4 < MgSO4. At both temperatures, CaF2(s) solubilities in CaSO4·2H2O(s)- or CaSO4(s)-saturated MSO4 (M = Zn, Mn, Mg) aqueous solutions are generally lower than those in pure MSO4 (M = Zn, Mn, Mg) aqueous solutions. Particularly, the salting-in effect of MgSO4 on CaF2 is so strong that CaF2(s) dissolves completely and is converted to CaSO4·2H2O(s) and MgF2(s) in a concentrated MgSO4 aqueous solution. Hence, this study indicates that high temperatures and high salt concentrations increase the CaF2(s) solubility, making the removal of Ca2+ and F– ions from the system challenging. Further, the existence of impurity salts MnSO4 and MgSO4 makes it more difficult.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Mengzhu Wang,Hengjia Zhu,Bangxiang Liu,Panwang Hu,Jianming Pan,Xiangheng Niu
Multimodal detection is a promising paradigm because of its advantages of expanding usage scenarios and improving reliability. However, it is very challenging to design reasonable strategies to achieve the multimodal sensing of targets. Herein, we developed an unprecedented bimodal ratiometric colorimetric/fluorometric method by exploring a novel bifunctional artificial oxidase mimic, Mn-doped N-rich carbon dots (Mn-CDs), to achieve the high-performance determination of nitrite in complicated matrices. The Mn-CDs exhibited both tunable photoluminescence and high oxidase-like activity, effectively catalyzing the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation to generate blue TMB+. When nitrite was introduced, the TMB+ species generated would specifically react with nitrite to produce diazotized TMB+, resulting in a color change from blue to green and finally to yellow. Simultaneously, the fluorescence of Mn-CDs was quenched by the diazotized TMB+ product via the inner filter effect. Hence, the existence of nitrite could lead to the simultaneous variations of visual color and photoluminescence, providing the principal basis for the bimodal ratiometric colorimetric/fluorometric quantification of the target. With the method, excellent sensitivity, selectivity, reliability, and practicability for nitrite detection were verified. Our work proposes a new bimodal strategy for nitrite measurement using bifunctional CDs-based enzyme mimics, which will inspire future effort on the exploration of promising multifunctional nanozymes and their advanced applications in biochemical sensing.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 5
·11994-12004
·
IF 5.19
Ye Chen,Fang Tingwei,Long Xinyi,Wang Hui,Chen Shao,Zhou Jie
Compared with that of the transition metal mixed oxide pellet catalyst, the catalytic activity of the supported mixed oxide catalyst was significantly reduced, which was limited in practical industrial applications. In this work, supported Cu-Mn-Ce mixed oxide catalysts were prepared by non-thermal plasma. Catalyst characterization result demonstrated that plasma treatment could promote the proportion of oxygen vacancy and enhance the adsorptive strength of VOCs on the surface of catalyst. Meanwhile, plasma treatment process exerted a slight influence on the pore structure and morphological property of the catalyst. Consequently, CMC/SiO 2 –P exhibited much higher catalytic activity than CMC/SiO 2 prepared by the incipient wetness impregnation method for the catalytic oxidation of toluene and n-hexane. Among the catalysts prepared, the 15%CMC/SiO 2 –P catalyst even exhibited a high catalytic activity comparable to that of the supported noble metal catalyst for the oxidation of the inert hexane. The T 98 of toluene and n-hexane over 15%CMC/SiO 2 –P was 260 and 280°C under the conditions of VOC concentration at 1000 ppm and WHSV at 20,000 mL·g −1 ·h −1 , respectively. This work provided a novel method for the preparation of the supported transition metal mixed oxide catalyst.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 48
·25463-25470
·
IF 14.511
Meifeng Wu,Qiaohui Ruan,Haixia Jiang,Longshuai Zhang,Dengke Wang,Jianping Zou
Recent studies have witnessed the great prospect of bi-atom catalysts (BACs) in realizing effective electrocatalytic CO2 reduction. However, the precisely controllable syntheses of BACs with outstanding properties remain a significant challenge. Herein, the first bi-atom Fe/Mn–N–C catalyst for CO2 reduction was successfully developed by the co-carbonization of Fe/Mn co-doped ZIF-8 (Fe/Mn@ZIF-8) and carbon black. This strategy enhances the conductivity and induces the confinement effect of carbon supports, which contributes to anchoring trace Fe/Mn dual sites on hierarchically porous N-doped carbon. The bimetallic Fe/Mn–N–C catalyst exhibits an excellent CO faradaic efficiency of 95.7% at a low overpotential of 370 mV vs. RHE. DFT results reveal that the coexistence of trace Mn sites can strengthen the catalytic capabilities of Fe active sites in bimetallic Fe/Mn–N–C. The synergistic effect of ultralow-loaded Fe/Mn dual sites is favorable for the adsorption and activation of CO2 as well as *CO desorption from Fe active sites, boosting the entire CO2-to-CO transformation. This work provides valuable insight into the rational design of BACs for efficient CO2 electroreduction.
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