Organics
·
2025
·Vol. 6
·期 3
·36
·
IF 1.6
Liping Wang,Mingyu Zhang
Porous carbon-loaded MnO was prepared via a combination of the sol–gel method and the chemical blow molding method using polyvinylpyrrolidone (PVP) and manganese nitrate as starting materials. SEM, EDX, TEM, FTIR, XRD, XPS, nitrogen adsorption–desorption, and elemental analysis were used to assess its physical and chemical characteristics. Furthermore, the adsorption property of porous carbon-loaded MnO for hexavalent chromium (Cr(VI)) in polluted water was investigated in detail. The results demonstrated that large numbers of MnO nanoparticles were evenly mounted on the surfaces of carbon walls, with a uniform distribution of C, N, and O elements. The BET surface area was 46.728 m2/g, and the pore sizes of porous carbon ranged from 2 nm to 10 nm. Additionally, abundant surface functional groups were found in porous carbon-loaded MnO, a result consistent with XPS data and applicable to the adsorption of heavy metals from aqueous solutions containing Cr(VI). The Freundlich model fitted the adsorption isotherm well, and the pseudo−second−order model precisely matched the adsorption kinetics. According to the study results, the adsorption was multilayer, and the adsorption process involved an endothermic reaction. These results indicate that this is a feasible way to synthesize a high−efficiency adsorbent for the removal of harmful heavy−metal ions from wastewater.
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Science China-Chemistry
·
2024
·
IF 10.4
Liu Zheng,Qiu Zhipeng,Li Zhiyuan,Wei Tong,Fan Zhuangjun,Pang Huan
Due to the low cost, high theoretical capacity, and environmental friendliness, manganese-based cathodes are regarded as promising alternatives for aqueous zinc ion batteries (AZIBs). However, the practicality of the zinc-manganese system is faced with great challenges, such as the inevitable structural collapse of the cathode and controversial energy storage mechanisms. Herein, we propose a novel concept of spatial deposition mechanism through the addition of MnSO 4 additives in the MnO-pillared graphene blocks (G-MnO). The covalent interface between MnO nanoparticles and multilayered graphene nanosheets can construct an in-built micro-electric field, which is beneficial for consecutive electron transfer (in both horizontal and vertical directions). On this basis, the surficial activity of MnO confined in the interlayered nano-space is greatly enhanced and provides enough spatial deposition and subsequent reaction site for MnSO 4 additives, thus firstly extending the surficial controlled process to stereoscopic space, effectively improving the electrochemical performance of AZIBs. Therefore, the assembled Zn//G-MnO battery exhibits an excellent rate capability of 281.5 mAh g −1 at 0.1 A g −1 and 106 mAh g −1 at 20 A g −1 , and impressive cycling stability (93 mAh g −1 remaining after 5,000 cycles). This finding may provide a new opportunity for the rational design of surficial controlled energy storage and conversion devices.
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IONICS
·
2024
·Vol. 30
·期 8
·4479-4486
·
IF 2.4
Tang Anping,Chen Juedong,Xu Guorong,Song Haishen,Wang Jinglun,Chen Hezhang
Non-intercalation cathode materials based on nanocomposites of lithium fluoride and Li-free transition metal compounds have drawn attention as materials for fabricating the cathode of lithium ion batteries owing to their high theoretical specific capacities and high redox voltages. In the present study, a nanocomposite of MnO-LiF was in situ synthesized by a quick annealing at 500 °C for just 5 min using a mixture of ammonium fluoride, manganese acetate, and lithium acetate as precursor. The synthesized composite is investigated by X-ray diffraction, scanning electron microscopy, nitrogen sorption, and charge-discharge measurements. As a lithium-ion battery cathode, it delivers respectively an initial discharge-specific capacity of 170 mAh g −1 and a discharge-specific capacity of 137 mAh g −1 in the 50th cycle at a current rate of C/20, which is equivalent to a moderate capacity retention rate of 80.6%. The novel synthesis approach proposed offers access to electrochemically active composites of lithium fluoride and Li-free transition metal oxides.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Ehsan Ullah,Ali B.M. Ali,Muhammad Zia Ullah Shah,Shenghui Guo,A. Shah,Yannan Zhang,Peng Dong,Hassan M.A. Hassan,Talal M. Althagafi,Sameerah I. Al-Saeedi,Rakhmonov
Metal oxides have been widely studied as an efficient and robust electrode material for supercapacitors for a couple of decades due to their affordability, high capacitance, multiple oxidation states, pseudocapacitive nature, and excellent redox activity. In this paper, a SnO 2 -MnO 2 hierarchical nanostructure (HNS) composite has been developed via a cost-effective and straightforward hydrothermal reaction. FESEM and TEM analysis revealed flower-like and nanowire-like morphologies for SnO 2 and MnO 2 , respectively , with highly pure, crystalline tetragonal structure. The average size of SnO 2 microflowers and MnO 2 nanorods is 1.5 μm and 2.3 μm. The chemical composition and oxidation states of the samples were investigated using Energy-Dispersive X-ray (EDX) and X-ray Photoelectron Spectroscopy (XPS), specifying the adequate formation of the SnO 2 -MnO 2 HNS composite. The surface area and pore analysis of the samples reveal that the SnO 2 -MnO 2 HNS composite yields the highest BET surface area of 62.93 m 2 /g with mesoporous features centered at ~9 nm. Remarkably, at a low current rate of 1 A/g, the SnO 2 -MnO 2 HNS composite achieved a high capacitance of 520 F/g as compared to pure SnO 2 and MnO 2 in a three-electrode mode assembly at identical conditions. The emergence of heterointerfaces enhanced the capacitance of the composite by providing more surface area for charge transfer and storage at the electrode/electrolyte interface. An asymmetric hybrid supercapacitor (HASC) was constructed utilizing two pseudocapacitive electrode materials: a SnO 2 -MnO 2 HNS composite as the anode and FeSe 2 as the cathode, represented as SnO 2 -MnO 2 ||FeSe 2 . The fabricated HASC attained a high specific capacitance of 111 F/g, a high energy density of 44.5 Wh/kg, and a power density of 852 W/kg at 1 A/g. At higher current rates, the power density extends to 4153 W/kg, with an energy density of 15 Wh/kg. Similarly, notable stability was observed, with 93.5% capacitance retention after 10,000 cycles during HASC assembly. Therefore, metal oxides are extensively explored as electrode materials for supercapacitors, and their superiority remains a top priority for researchers and engineers in the design of viable and renewable energy technologies.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Xintong Li,Zhichuan Yang,Shenglong Li,Min Gao,Yu Liu
Although remarkable progress has been achieved in electrocatalytic water splitting, the design of highly efficient bifunctional catalysts remains a significant challenge, mainly because of the slow kinetics of the oxygen evolution reaction (OER) and the limited stability of non-precious metal catalysts. This work presents a novel heterojunction catalyst consisting of Co–MnO nanocubes anchored on nitrogen-doped graphitic carbon derived from carbonized Ganoderma lucidum mycelium (CGLM), synthesized via an ion-exchange-coupled pyrolysis strategy. The unique fibrous entanglement morphology of CGLM offers ideal anchoring sites for catalytic centers, while preserving its intrinsic three-dimensional porous architecture to establish a continuous conductive network. This structural enhances electron transport efficiency and promotes stable immobilization of Co–MnO nanocubes (Co–MnO -2 /CGLM). Extensive experimental and theoretical investigations demonstrate that the Co–MnO -2 heterogeneous interface induces charge redistribution, synergistically optimizes the hydrogen adsorption free energy (Δ G H = −0.15 eV), and reduces the OER energy barrier, with a rate-determining step of Δ G 4 = 1.69 eV. The catalyst demonstrates remarkable bifunctional activity in alkaline media, exhibiting overpotentials of 105 mV for hydrogen evolution reaction (HER) at 10 mA cm −2 and 250 mV for OER at 50 mA cm −2 . Notably, the assembled electrolytic cell (Co–MnO -2 /CGLM||Co–MnO -2 /CGLM) achieves a voltage of only 1.61 V (50 mA cm −2 ) in overall water-splitting tests and maintains excellent durability, with negligible change in current density during prolonged operation. This study highlights the synergistic effect of heterogeneous structure engineering combined with biomass-derived carbon substrates in reducing reaction barriers and facilitating charge transfer, offering novel perspectives on the design of cost-effective electrocatalysts for sustainable energy conversion.
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COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Yue Liu,Zhihui Zeng,Sinan Zheng,Jing Qiao,Wei Liu,Lili Wu,Jiurong Liu
A type of nickel/manganese oxide (Ni/MnO)/carbon nanocomposite fibers were prepared via a facile and scalable electrospinning and carbonization approach. In comparison to the pure carbon showing a severe agglomeration, the uniformly embedded MnO and Ni nanoparticles promoted the formation of the fibrous carbon-based nanocomposites with an average diameter of 250 nm and a rough surface. The synergistic coactions of the MnO nanoparticles acting as impedance modulating mediator, the magnetic Ni nanoparticles, and the conductive, fibrous carbon with large aspect ratio and rough surface contributed to the excellent electromagnetic wave (EMW) absorbing performance of the nanocomposites. The nanocomposites with a MnO/Ni ratio of 1:1 exhibited an effective absorption bandwidth of 6.5 GHz at a thickness of 2.9 mm and a minimum reflection loss of −53.23 dB at a thickness of 2.3 mm. The EMW absorption mechanisms of the nanocomposite fibers were discussed at length, which showed the importance of the multi-component building units and microstructure for achieving high EMW absorbing performance. This work thus suggested a convenient, facile, and scalable manufacturing approach for constructing high-performance multi-component nanocomposite fiber based EMW absorbing materials.
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CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jian Pan,Junchao Qian,Zhengying Wu,Chengbao Liu,Yiyang Liu,Yucheng Qian
The increasing demand for power storage device with high energy density forces the scientists to design new materials as electrodes. In this work, hollyhock stalks were converted into porous carbon host for growth of MnO and CeO 2 nanocrystals hydrothermally. The obtained biocarbon with macro-meso-micro porous structure provides excellent electron transport properties, while the nano-size MnO-CeO2 (<10 nm) on it grants high capacitance. Due to the unique nanostructure of carbon skeleton and ultra-large surface areas (514.4 m 2 g −1 ), the MnO-CeO 2 nanocrystals/porous carbon displays excellent electrochemical capacitance performance (162 F·g −1 at 0.5 A·g −1 ) and cycle stability. The specific capacity remains 99.3% efficiency after 1000 cycles at 500 mA·g −1 .
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 9
·3029-3039
·
IF 7.059
Peitao Xie,Yifan Li,Qing Hou,Kunyan Sui,Chunzhao Liu,Xueyan Fu,Jiaoxia Zhang,Vignesh Murugadoss,Jincheng Fan,Yanpeng Wang,Runhua Fan,Zhanhu Guo
One-dimensional wires are the most common building blocks in metamaterials. In this study, zero-dimensional nanoparticles connected by tunneling networks were used to construct metamaterials, thus providing a more flexible alternative for designing the geometrical configuration of metamaterials, particularly in nanodevices. The composites with nickel nanoparticles@MnO were prepared by a bio-gel derived strategy. Nickel nanoparticles were not connected geometrically, but the conductive network had been already formed, which was a tunneling-dominated percolative phenomenon demonstrated by the first-principles calculation. Negative permittivity was achieved in the composites, as the low-frequency plasmonic state could be generated in the tunneling nickel-networks. At the same time, negative susceptibility was observed due to the diamagnetism of the tunneling current loops. Electromagnetic simulations indicate that the composites have the potential for electromagnetic shielding (only 0.25 mm in thickness). It is believed that this study not only fills up the research gap in the influence of the tunneling effect on negative electromagnetic parameters but also opens up another way of preparing metamaterials by using zero-dimensional nanoparticles instead of one-dimensional wires.
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METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2020
·Vol. 51
·期 4
·1339-1343
·
IF 2.035
Ren Guoxing,Xiao Songwen,Liao Caibin,Xia Longgong,Liu Zhihong
The activity coefficient of CoO in SiO 2 -saturated MnO-SiO 2 slag was measured using metal-slag-gas equilibrium experiments under controlled oxygen potentials (10 −12 to 10 −10 atm) at 1623 K. The solubility of CoO in the slag increased with increasing oxygen potential and cobalt content in the alloy. The activity coefficient of cobalt oxide, γ CoO , referred to solid CoO, can be described as: γ CoO = 1.65 − 0.14 (wt pct CoO), where (wt pct CoO) represents the mass percent of CoO in the slag.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Huilu Guo,Xiaojian Mao,Jian Zhang,Run Tian,Shiwei Wang
Attempts have been made to manufacture AlON transparent ceramics at low temperature using a new sintering aid system, Y 2 O 3 -La 2 O 3 -MnO. The sintering behaviors, including relative density and microstructure evolution of AlON ceramics doped with Y 2 O 3 -La 2 O 3 , MnO alone, and Y 2 O 3 -La 2 O 3 -MnO were compared. It was found that both the relative densities and grain sizes of samples doped with Y 2 O 3 -La 2 O 3 -MnO were much higher and larger than those of samples doped with Y 2 O 3 -La 2 O 3 or MnO alone, respectively. A liquid phase containing Al, O, N, Mn, and La formed at high temperature and played an important role on both eliminating pores and promoting grain growth of the sintered AlON bodies. Finally, translucent AlON ceramics were obtained through pressureless sintering at 1830 °C for 1 h, ~100 °C lower than those with conventional sintering aid Y 2 O 3 -La 2 O 3 . The ceramics doped with MnO showed green emission at 534 nm, under 445 nm excitation. We believe Y 2 O 3 -La 2 O 3 -MnO is a promising additive for the preparation of AlON transparent ceramic at lower temperature.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Zhibo Yan,Yixuan Tao,Guangrui Liu,Jie Yin,Juan Li,Wenpin Wang,Jie Wu,Zhongcheng Li
Suffering from their low conductivity, Mn-base oxides are commonly inactive in H–OH activation. Generally, tailoring the coordinate environment of materials could induce variation in the atomic arrangement and further influence their chemical activity. Herein, we propose a feasible strategy to mediate the electronic structure of Mn-based oxides by facile hydrothermal method and thermal reduction route. Compared with MnO 2 sheets, the as-synthesized Ru/MnO–Mn 7 C 3 /N-doped carbon sheets (Ru/MnO–Mn 7 C 3 /NC) exhibit the higher activity for both acidic (73 mV) and alkaline water reduction reaction (44 mV@10 mA/cm 2 ). Benefitting from unique structures, Ru/MnO–Mn 7 C 3 /NC sheets show the better freshwater/seawater oxidation reactivity, exceeding RuO 2 . The strong interaction of MnO–Mn 7 C 3 heterostructures, Ru, and N-doped carbon endows Ru/MnO–Mn 7 C 3 /NC with the good freshwater and seawater dissociation performance, outperforming most of the reported Mn-based oxides.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xu Liu,Yanping Liu,Minghao Jin,Chenxi Xu,Yushan Tian,Miao Zhou,Wei Wang,Gangyong Li,Zhaohui Hou,Liang Chen
Owing to high theoretical capacity, low cost and abundant availability, manganese oxides are widely viewed as promising anodes for lithium–ion batteries (LIBs). Nonetheless, their practical application is significantly hindered by poor electrical conductivity, sluggish reaction kinetics and substantial volume change. In this work, an ingenious polypyrrole encapsulation followed by pyrolysis strategy is proposed to produce N–doped carbon encapsulated Mn 2 O 3 /MnO heterojunction (Mn 2 O 3 /MnO@NC) by using mechanically ground Mn 3 O 4 /C 3 N 4 mixture as the precursor. The results show that the selection of precursor plays a pivotal role in the successful preparation of Mn 2 O 3 /MnO@NC hybrid. It is revealed that the uniform encapsulation by N–doped carbon significantly enhances the conductivity and structural stability of the final product. Concurrently, the Mn 2 O 3 /MnO heterojunction within the resultant hybrid exhibits a unique quantum–dot size, which effectively shortens ion transport pathways and exposes the active sites for lithium storage. Additionally, experimental observations and theoretical calculations demonstrate that the built–in electric fields generated at the interfaces of Mn 2 O 3 /MnO heterojunction accelerate the charge transfer and ion diffusion, thereby enhancing the electrochemical reaction kinetics. As a result, the Mn 2 O 3 /MnO@NC hybrid displays much enhanced lithium storage performance. Evidently, our work offers a good guidance for the design and synthesis of advanced transition metal oxide/carbon anodes for LIBs.
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