ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Lianbang Wang,Jing Zhan,Jinpei Hei,Liwei Su,Huan Chen,Hao Wu,Yuanhao Wang,Hongxia Wang,Manman Ren
As promising electrode materials for supercapacitors , manganese oxides still have big challenges such as the low material utilization and poor ionic/electronic conductivity. Reducing particle sizes through nanotechnology has been used to improve material conductivity and electrochemical active sites at materials/electrolyte interfaces. Nevertheless, the extremely small particle size may result in physical and/or chemical instability, mass loss and subsequent capacitance attenuation. Understanding this trade-off effect of electrode materials size with their electrochemical properties is critical to fabricate high-performance supercapacitors. In this work, we prepare homogenous and size-tunable MnO particles (with mean diameters of 80, 41, 20, 15 and 9 nm) on carbon cloth via a facile gel-like film assisted method. It is found that the medium-size nanoparticle (20 nm) displays the best performance instead of the smallest one. These observations are different from the traditional view about material size-property relationship. Instead this work provides a new insight referring to both the size-dependent solubility and ionic/electronic transport. Beneficial from the good flexibility and high conductivity/stability of carbon cloth, the optimized MnO/carbon cloth electrode demonstrates extraordinary performance in symmetric solid-state supercapacitors with energy densities of 86 and 70 Wh kg −1 at the power densities of 450 W kg −1 and 9 kW kg −1 , respectively.
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DOI
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Hongguang Zhang,Zi Yu,Yongxin Liang,Tao Gan,Zuqiang Huang,Huayu Hu,Yanjuan Zhang
The utilization of organic molecules as in-situ hydrogen donors for producing γ-valerolactone (GVL) biofuel from biomass-derived levulinic acid (LA) represents one of the promising sustainable approaches. However, this process still faces challenges, including the difficult activation of the hydrogen source and the transport limitations of active hydrogen species. Herein, a Co-MnO/spontaneously polarized ceramic-carbon (Co-MnO/SPCE-C) composite catalyst, featuring a unique spontaneous polarization effect, was developed for catalytic transfer hydrogenation (CTH) of LA to GVL in the isopropanol/H 2 O (volume ratio = 1/19) cosolvent system. Co-MnO/SPCE-C contributed to an outstanding LA conversion of 99.9% and a favorable GVL yield of 93.5%, surpassing the performance achieved by comparative catalysts. Various characterization techniques demonstrate that SPCE with far-infrared emission and surface electric field increased the oxygen vacancies, thereby promoting hydrogen spillover and enhancing the properties of CoO x –MnO acidic sites. The 17 O NMR spectra reveal that SPCE activated water clusters by weakening the hydrogen bonding network. Moreover, D 2 O experiments show that SPCE facilitated the participation of water in the reaction. This work provides valuable insights into the development of an efficient strategy for producing GVL from LA. Before the catalyst can be considered for commercial applications, the focus in the future should be on a comprehensive computational analysis, long-term evaluation of catalyst stability, and additional industrial-scale testing.
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Nanoscale
·
2025
·
IF 5.1
Yun Yang,Qing Long,Wei Wang,Junlin Huang,Yufei Zhao,Hao Liu,Hong Gao
Rechargeable zinc-air batteries (ZABs) have emerging as rechargeable zinc-air batteries have emerged as a compelling candidate for advanced electrochemical energy storage and conversion system, owing to their exceptional theoretical energy density, cost-effectiveness, and environmental competibility. Despite these dvantages, their practical utility is restrained by the intrinsically sluggish kinetics of both the oxygen reduction (ORR) and oxygen evolution (OER) reactions. Herein, we present a novel coordination-assisted ball-milling approach to fabricate MnO/Co-N-CNT composites featuring a unique interwoven carbon nanotube architecture. This rationally designedmicrostructure not only facilitates more efficient ion diffusion and electron transport, but also exploits the synergistic interaction between cobalt and manganese species to substantially enhance ORR/ OER activity and long-term stability. As a result, ZABs incorporating these advanced composites achieve an impressive peak power density of 247.6 mW cm-2 and sustain stable cycling for over 115 hours. These findings offer fresh insights into strategic material design and hold significant potential for guiding the future development of high-performance electrochemical energy devices.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Huiting Xu,Huibin Liu,Wenyue Yang,Meng Li,Fan Zhao,Chunli Li,Junjie Qi,Honghai Wang,Wenchao Peng,Xiaobin Fan,Jiapeng Liu
Rechargeable aqueous zinc batteries (AZBs) are increasingly recognized as an alternative to conventional energy storage systems due to their environmentally safe nature, abundant zinc resources, and high theoretical capacity. However, the intercalation or surface redox mechanisms limit the development of AZBs cathode materials due to low specific capacity and energy density. The tellurium-based (Te) materials with conversion mechanisms are promising cathode materials for AZBs. Nevertheless, the slow kinetics are detrimental to the increase in specific capacity and energy density for Zn-Te battery. Therefore, a hierarchical structure of manganese oxide (MnO) hollow nanospheres loaded on nitrogen-doped carbon nanosheets (MnO@NC) was rationally designed and used as Te hosts (Te/MnO@NC) for Zn-Te battery. This hierarchical structure facilitates the loading of more Te species. Meanwhile, the MnO hollow nanospheres can expose more active sites, which can promote the kinetics of Te redox reactions thereby lowering the reaction energy barrier. The Te/MnO@NC cathode exhibits high specific capacity and high energy density (429 mAh g −1 and 407 Wh Kg −1 at 0.1 A g −1 ). Additionally, the conversion mechanism was investigated by systematic characterization and density functional theory (DFT) calculations. This study presents a new design platform for developing AZBs with high specific capacity and energy density.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
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IF 3.807
Lili Xiao,Lin Jia,Shengzhi Zhao,Xiaoying Tang,Chengjie Zhu,Huan Huang,Jin Jiang,Mingtian Li
A kind of one-step, solvent-free, environment-friendly method is always highly appreciated in synthesis of electrocatalyst . In this work, MnO nanoparticles were coated by sheet-like carbon (MnO/C) for building a three-dimensional electrocatalyst with interconnected mesopores . Moreover, the unique porous structure of MnO/C can be facilely achieved through a one-step solvent-free calcination . In the calcination, 2-methylimidazole (2-MeIm) decomposed into carbon framework at the catalysis of MnO. The interconnected pores consisted of sheet-like carbon can significantly reduce mass transfer resistances and prevent the aggregation of MnO. Therefore MnO/C modified glassy carbon electrode (GCE) exhibited high activities in simultaneous detection of dopamine (DA) and uric acid (UA), with the sensitivities of 9.92 μA μM − 1 for DA, 8.42 μA μM − 1 for UA. The limits of detection were calculated as 0.009 μM and 0.03 μM for DA and UA, respectively. Moreover, MnO/C has promising application in detection of human urine and serum due to the satisfactory recoveries.
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高影响因子
Energy & Environmental Science
·
2019
·Vol. 12
·期 3
·1046-1054
·
IF 33.25
Siwu Li,Yuan Liu,Junwen Zhou,Shanshan Hong,Yu Dong,Jiaming Wang,Xing Gao,Pengfei Qi,Yuzhen Han,Bo Wang
Li–CO2 batteries have been developed in recent years, aiming to utilize CO2, a major cause of the greenhouse effect, as an effective energy storage medium. However, current Li–CO2 batteries still suffer from low energy efficiency, poor rate capability and short cycle life, demanding the design of more efficient CO2 cathodes. Herein, we synthesized ultrafine MnO nanoparticles dispersed in a graphene-interconnected N-doped 3D carbon framework, MnO@NC-G, by pyrolyzing a composite of a GO-wrapped metal–organic framework (MOF) containing Mn(II) active sites as the cathode material for Li–CO2 batteries. This material can enable low voltage hysteresis (0.88 V at 50 mA g−1), high rate capability (up to 1 A g−1) and long cycle life (more than 200 cycles) in cells. By comparing MnO@NC-G with four other Mn(II)-based cathodes, MnO@NC, parent Mn-MOF, MnO@KB and bulk MnO, we propose three key aspects for designing CO2 cathodes: (1) dispersed catalytic species, (2) fast electron transport, and (3) a robust interconnected network. We also found that the performance of a cycled MnO@NC-G cathode can be replenished simply by replacing the anode, indicating that the cell cycle life can be further extended with effective anode protection. Our findings here provide useful guidelines for improving the performance of Li–CO2 batteries, thus shedding light on the development of practical Li battery systems based on gaseous cathodes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Xiaoming Yu,Weixin Chen,Junjie Cai,Xia Lu,Zhipeng Sun
A modified separator for improving the electrochemical performance in Li-S batteries is fabricated by functional composites coating, comprised of MnO nanoflakes with rich oxygen vacancies and N doped carbon nanotubes (MnO-OVs/NCNTs). On the one hand, MnO as a polar material can anchor lithium polysulfides (LiPSs) on the interface via chemical bonding. In addition, introducing oxygen vacancies into MnO by heat treatment under a reducing atmosphere can regulate the electronic structure and provide extra active sites for further boosting the chemical adsorption capability of LiPSs, facilitating the redox reaction of LiPSs, as well as enhancing the electron transfer efficiency. On the other hand, the MnO-OVs/NCNTs layer is a barrier to block the LiPSs directly diffusing through the separator and acts as an upper collector to reduce the interface resistance reactivate the trapped sulfur species, thereby enhancing the sulfur utilization. Given these advantages, the MnO-OVs/NCNTs modified separator employed in Li-S batteries exhibit considerable capacity (1516 mAh g −1 at 0.1C), enhanced long-term cycling stability (capacity retention of 618 mAh g −1 for over 500 cycles at 1C), and rate performance (550 mAh g −1 at 3C).
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COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Qihao Li,Xin Wang,Cheng Li,Xinwei Yang,Lichao Jia,Jian Li
NiMn 2 O 4 (NMO) coated Gd-doped CeO 2 (GDC) and NiO powders are prepared by a hydrothermal method for the anode of a metal (Ni-10 at.% Fe)-supported solid oxide fuel cell fueled by wet CH 4 (3 vol.% H 2 O). NMO remains on NiO but dissolves into GDC at 1400 °C. Upon reduction in H 2 at 700 °C for 2 h, Ni nanoparticles exsolve on the doped-CeO 2 (DCO) substrate (DCO@Ni), while MnO nanoparticles form on Ni (Ni@MnO). DCO@Ni demonstrates high catalytic activity for reforming wet CH 4 and high resistance to carbon deposition with a yield of H 2 increasing from 11 (500 °C) to 33 (700 °C) ml min −1 and remaining around 25 ml min −1 at 600 °C for 30 h. The metal-supported single-cell with a Ni@MnO-DCO@Ni anode shows high initial and durable electrochemical performance with a maximum power density increasing from 160 (500 °C) to 720 (700 °C) mW cm −2 and a cell voltage remaining above 0.55 V at 600 °C for 200 h under 400 mA cm −2 and 20 ml min −1 . Such high performance is ascribed to the metal support with low ohmic resistance and the engineered anode with high catalytic activity and enhanced resistance to carbon deposition.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Hongbo Liang,Mengfan Pei,Shuo Zhuo,Rui Xie,Hui Lin,Wenkai Song,Zirui Guo,Xigao Jian,Fangyuan Hu
The high activation barriers for sodium polysulfide conversion during the charge–discharge processes of room-temperature sodium–sulfur batteries lead to sluggish reaction kinetics, thereby resulting in limited practical specific capacities. This simultaneously triggers the shuttle effect, leading to a rapid decay in specific capacity. In this study, we propose a hierarchical (crystalline-atomic) catalytic strategy, where the hierarchical catalyst features both manganese oxide crystalline sites and Mn single-atom sites. The two catalytic sites selectively anchor the sulfur and metal moieties of sodium polysulfides, respectively, exerting a “tearing” effect that weakens the chemical bonds and lowers the activation energy, thereby accelerating the polysulfide conversion. The cathode material synthesized using this method retains a specific capacity of 309 mAh g −1 after 2000 cycles at a current density of 2C, indicating that hierarchical parallel catalysis can effectively mitigate the shuttle effect and accelerate the reaction kinetics. Therefore, this work demonstrates the practical potential of hierarchical parallel catalysis in metal-sulfur batteries and provides a new approach for catalyst design in this domain.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Cheng He,Jing Li,Xiaoyang Zhao,Xi Peng,Xiaochun Lin,Yanfei Ke,Xin Xiao,Xiaoxi Zuo,Junmin Nan
Although transition metal oxides have the advantages of large theoretical capacity, low cost and eco-friendliness, their application as anodes for lithium-ion batteries (LIBs) is still limited due to their undesirable electrical conductivity and large volume expansion. Herein, a novel two-step rapid freeze-drying-calcination strategy was applied to prepare highly dispersed nano-MnO-anchored three-dimensional nitrogen-doped porous carbon framework composites (MnO@3D N-PCF). Compared with MnO and undoped MnO@3D PCF, the MnO@3D N-PCF anode exhibits superb cycle stability, remarkable specific capacity and impressive high-rate performance (1037.0 mAh g −1 over 100 cycles at 0.1 A g −1 and 760.9 mAh g −1 over 500 cycles at 5 A g −1 ), mainly due to its well-designed 3D nanoarchitecture. It is found that 3D nitrogen-doped carbon networks can act as stable conductive bridges to facilitate electron transport and sufficient diffusion channels for Li ions. The MnO nanoparticles obtained by rapid lyophilization and calcination technology are highly dispersed in the porous 3D carbon skeleton, which can buffer volume expansion and preserve the stability of the electrode. It is expected that this simple and green synthesis strategy will open the door for the development of transition metal oxide/carbon three-dimensional nanocomposites with high stability and excellent electrochemical properties.
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高影响因子
LANGMUIR
·
2020
·
IF 3.557
Lun Zhang,Kuo Wei,Juanjuan Yin,Jingxin Zhou,Lexin Zhang,Jinghong Li,Tifeng Jiao
Constructing the nanostructure of transition metal oxides for high energy density lithium-ion batteries has been widely studied recently. Prompted by the idea that the transition metal can serve as a catalyzer influence on the reversibility of solid–electrolyte interphase films, Co/MnO@C composite nanofibers were designed by electrospinning and chemical vapor deposition methods. The Co/MnO@C electrode showed superior electrochemical performance with a large capacity increase for the first 400 cycles and a high rate performance of 1345 mA h g–1 at 1000 mA g–1. There was no obvious decay of capacity over the whole 1000 cycles, demonstrating the excellent cycling stability of the samples. The new design and synthesis of the anodic materials may offer a prototype for high-performance and strong-stability batteries.
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PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Fengmei Wang,Huimin Zhao,Yiru Ma,Yu Yang,Bin Li,Yuanyuan Cui,Ziyang Guo,Lei Wang
Designing the highly catalytic activity and durable bifunctional catalysts toward oxygen reduction/evolution reaction (ORR/OER) is paramount for metal–air batteries . Metal–organic frameworks (MOFs)-based materials have attracted a great deal of attention as the potential candidate for effectively catalyzing ORR/OER due to their adjustable composition and porous structure . Herein, we first introduce the Mn species into zeolitic-imidazole frameworks (ZIFs) and then further pyrolyze the Mn-containing bimetallic ZIFs to synthesize core-shell-structured Co@Co 4 N nanoparticles embedded into MnO-modified porous N-doped carbon nanocubes (Co@Co 4 N/MnO NC). Co@Co 4 N/MnO NC exhibits the outstanding catalytic activity toward ORR and OER which is attributed to its abundant pyridinic/graphitic N and Co 4 N, the optimized content of MnO species, highly dispersed catalytic sites and porous carbon matrix. As a result, the Co@Co 4 N/MnO NC-based Zn–air battery exhibits enhanced performances, including the high discharge capacity (762 mAh g Zn −1 ), large power density (200.5 mW cm −2 ), stable potential profile over 72 h, low overpotential (<1.0 V) and superior cycling life (2800 cycles). Moreover, the belt-shaped Co@Co 4 N/MnO NC cathode-based Zn–air batteries are also designed which exhibit the superb electrochemical properties at different bending/twisting conditions.
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