Now showing 1 - 10 of 82
  • Publication
    Metadata only
    Advancing electrodialysis with dually cross-linked PVDF-based anion exchange membranes having semi-interpenetrating networks
    (Elsevier, 2024)
    Jiang, Yazhen
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    Wang, Binghui
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    Liu, Hongyu
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    Liao, Junbin
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    Yu, Shuaijun
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    Shen, Jiangnan
    Electrically-driven membrane technology plays a crucial role in water treatment and purification, finding applications in various fields like saline water and wastewater desalination, saline concentration and wastewater recycling. The content of this study is based on dually cross-linking and hot-pressing on a PVDF blend, to fabricate a kind of anion exchange membranes (AEMs) having semi-interpenetrating network and thus improve the defect of the traditional heterogeneous AEMs. The research explores the impact of vinyl imidazole (VIM) and dimethylaminoethyl methacrylate (DMAEMA) monomers, primarily or dually cross-linking, and optimizes the membrane properties through a hot-pressing process. Under these optimized conditions, the resulting membranes exhibit robust mechanical properties and outstanding desalination capabilities, achieving an area resistance of 2.56 Ω cm2 (comparable to standard homogeneous membranes), a desalination rate of 97.26% (outperforming the Neosepta AMX: 76.90%), and a salt limiting concentration of 3.1 M (surpassing the heterogeneous AEM and Neosepta AMX). Notably, this synthesis method is characterized by its cheap raw material and low energy consumption. This research offers valuable insights for the advancement and large-scale implementation of anion exchange membrane desalination.
      9
  • Publication
    Metadata only
    Dual carbon-confined Sb2Se3 nanoparticles with pseudocapacitive properties for high-performance lithium-ion half/full batteries
    (2021)
    Han, Xu
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    Zhou, Chengyan
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    Zhu, Fengyaun
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    Zhang, Xiaoli
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    Geng, Hongbo
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    Cao, Xueqin
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    Zheng, Junyue
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    Gu, Hongwei
    Transition metal selenides have attracted enormous research attention as anodes for lithium-ion batteries (LIBs) due to their high theoretical specific capacities. Nevertheless, the low electronic conductivity and dramatic volume variation in electrochemical reaction processes result in rapid capacity fading and poor rate capability. Herein, a metal–organic framework is used as a template to in situ synthesize Sb2Se3 nanoparticles encapsulated in N-doped carbon nanotubes (N-CNTs) grafted on reduced graphene oxide (rGO) nanosheets. The synergistic effects of N-doped carbon nanotubes and reduced graphene oxide nanosheets are beneficial for providing good electrical conductivity and maintaining the structural stability of electrode materials, leading to stable cycling performance and superior rate performance. Kinetic analysis suggests that the electrochemical reaction kinetics is dominated by pseudocapacitive contribution. Notably, a high discharge capacity of 451.1 mA h g−1 at a current density of 2.0 A g−1 is delivered after 450 cycles. Even at a high current density of 10.0 A g−1, a discharge capacity of 192.6 mA h g−1 is maintained after 10 000 cycles. When coupled with a commercial LiFePO4 cathode, the full batteries show an excellent discharge specific capacity of 534.5 mA h g−1 at 0.2 A g−1. This work provides an effective strategy for constructing high-performance anodes for Li+ storage.
    WOS© Citations 10  61
  • Publication
    Metadata only
    Imidazole‐intercalated cobalt hydroxide enabling the li+ desolvation/diffusion reaction and flame retardant catalytic dynamics for lithium ion batteries
    (Wiley, 2024)
    Yang, Liu
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    Wang, Yisha
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    Wang, Jingwen
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    Zheng, Yapeng
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    Hu, Yuan
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    Zhu, Jixin
    Lithium-ion batteries have found extensive applications due to their high energy density and low self-discharge rates, spanning from compact consumer electronics to large-scale energy storage facilities. Despite their widespread use, challenges such as inherent capacity degradation and the potential for thermal runaway hinder sustainable development. In this study, we introduce a unique approach to synthesize anode materials for lithium-ion batteries, specifically imidazole-intercalated cobalt hydroxide. This innovative material significantly enhances the Li+ desolvation/diffusion reaction and flame-retardant dynamics through complexing and catalytic synergetic effects. The lithium-ion batteries incorporating these materials demonstrate exceptional performance, boasting an impressive capacity retention of 997.91 mAh g-1 after 500 cycles. This achievement can be attributed to the optimization of the solid electrolyte interphase (SEI) interface engineering, effectively mitigating anode degradation and minimizing electrolyte consumption. Experimental and theoretical calculations validate these improvements. Importantly, imidazole intercalated Co(OH)2 (MI- Co(OH)2) exhibits a remarkable catalytic effect on electrolyte carbonization and the conversion of CO to CO2. This dual action suppresses smoke and reduces toxicity significantly. The presented work introduces a novel approach to realizing high-performance and safe lithium-ion batteries, addressing key challenges in the pursuit of sustainable energy solutions.
      9
  • Publication
    Open Access
    An advanced cathode composite design for co-utilization of cations and anions in lithium batteries
    (2021)
    Wang, Xiao-Tong
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    Guo, Jin-Zhi
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    Gu, Zhen-Yi
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    Sun, Zhong-Hui
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    Li, Wen-Hao
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    Liang, Hao-Jie
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    Wu, Xing-Long
    Anions in the electrolyte are usually ignored in conventional "rocking-chair" batteries because only cationic de-/intercalation is considered. An ingenious scheme combining LiMn0.7Fe0.3PO4 (LMFP@C) and graphite as a hybrid cathode for lithium-ion batteries (LIBs) is elaborately designed in order to exploit the potential value of anions for battery performance. The hybrid cathode has a higher conductivity and energy density than any of the individual components, allowing for the co-utilization of cations and anions through the de-/intercalation of Li+ and PF6− over a wide voltage range. The optimal compound with a weight mix ratio of LMFP@C: graphite= 5: 1 can deliver the highest specific capacity of nearly 140 mA h/g at 0.1 C and the highest voltage plateau of around 4.95 V by adjusting the appropriate mixing ratio. In addition, cyclic voltammetry was used to investigate the electrode kinetics of Li+ and PF6- diffusion in the hybrid compound at various scan rates. In situ X-ray diffraction is also performed to further demonstrate the structural evolution of the hybrid cathode during the charge/discharge process.
    WOS© Citations 67Scopus© Citations 79  345  36
  • Publication
    Embargo
    Cobalt leaching inhibition: Transforming coordination polymers into spherical Co3O4@NC catalysts for accelerated tetracycline degradation via enhanced PMS activation
    (Elsevier, 2023)
    Ma, Rongyao
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    Zhou, Guolang
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    Gu, Mingrui
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    Tang, Xin
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    Ding, Wenhao
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    Guan, Yu
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    Jiang, Yexin
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    Yin, Jingzhou
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    Zhang, Lili
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    In this study, we synthesized Co-based coordination polymer-derived nitrogen-doped carbon-coated Co3O4 spheres (Co3O4@NC) and yolk-shell Co3O4 spheres (Co3O4-YS) under various atmospheric conditions to explore their efficacy in activating peroxymonosulfate (PMS) for tetracycline (TC) degradation. The Co3O4@NC, featuring a significantly higher specific surface area (268.4 m2/g), exhibited remarkable performance by achieving 90% TC removal in 5 minutes using 0.2 g/L PMS and 0.1 g/L of Co3O4@NC. This reaction rate was 9.2 times higher than that observed with Co3O4-YS. Furthermore, the Co3O4@NC/PMS system demonstrated exceptional stability across a wide pH range, in complex water compositions, and the presence of common coexisting ions. The unique coated structures effectively minimized the leaching of Co ions (below 0.447 mg/L). Additionally, the strong magnetism of Co3O4@NC allows for easy separation under a magnetic field. Mechanistic investigations identified 1O2, ∙OH, O2∙-, and SO4∙- as the principal reactive species. The study also explored potential degradation pathways and toxicity.
    Scopus© Citations 10  19  4
  • Publication
    Metadata only
    Sustainable production of molybdenum carbide (MXene) from fruit wastes for improved solar evaporation
    (2022)
    Marliyana Aizudin
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    Murali Krishna Sudha
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    Goei, Ronn
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    Lua, Shun Kuang
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    Rafeeque Poolamuri Pottammel
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    Tok, Alfred Ling Yoong
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    Freshwater production using solar-driven interfacial evaporation is considered to be a green and sustainable strategy. The biggest barrier to practical deployment of solar desalination, however, continues to be the lack of options for renewable materials. Herein, we present a simple two-step carbonization approach that is sustainable for developing innovative two-dimensional (2D) molybdenum carbide (Mo2C) materials derived from carbonized fruit wastes. The resultant 2D Mo2C photothermal layer has a high water evaporation rate of 1.52 kg m-2 h-1 with a photothermal conversion efficiency of 94 % under one sun irradiation, which is among the best values reported thus far. The broad solar absorption band, high specific surface area (555.1 m2 g-1) with large micro- and meso porosity of the Mo2C photothermal layer are responsible for these outstanding results. The conversion of food wastes into valuable products, in this case MXene, can potentially inspire greener developments of advanced materials for solar water evaporator.
    Scopus© Citations 1  69
  • Publication
    Metadata only
    Innovative low-energy enrichment of sulfuric acid using PVDF-HFP anion exchange membranes with acid-blocking properties
    (Elsevier, 2024)
    Yu, Shuaijun
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    Jiang, Yazhen
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    Xu, Geting
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    Xu, Zhipeng
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    Liao, Junbin
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    Shen, Jiangnan
    In recent years, the electrodialysis (ED) technology has gained substantial attention for its role in recovering sulfuric acid from industrial wastewater. However, the typical anion exchange membranes (AEMs) have been known to exhibit notable proton leakage during ED, which can severely hinder the efficiency of acid concentration. To overcome this issue, we utilized a substrate made of poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP). This choice capitalizes on the presence of fluorine-containing groups for enhanced acid stability and tertiary amine groups to minimize water content, resulting in a significant improvement in proton-blocking capabilities of the AEMs. It is worth noting that, through a combination of partial cross-linking and quaternization, these AEMs not only maintain their acid concentration performance but also substantially reduce energy consumption. Additionally, we conducted a thorough analysis of the delicate balance between current efficiency and energy consumption in acid recovery systems. In contrast to conventional AEMs and commercially available proton-blocking membranes such as ACM, we highlight the exceptional acid concentration capability (CH+ = 1.28 M) and the low energy consumption (3.3 kWh/kg) of AEM-1.2. This research breakthrough marks a significant advancement in the development of acid-blocking AEMs and strongly advocates for more efficient sulfuric acid recovery from industrial wastewater.
    Scopus© Citations 2  4
  • Publication
    Metadata only
    Revealing microscopic dynamics: In situ liquid-phase TEM for live observations of soft materials and quantitative analysis via deep learning
    (Royal Society of Chemistry, 2024)
    Sun, Yangyang
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    Zhang, Xingyu
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    Huang, Rui
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    Yang, Dahai
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    Kim, Juyeong
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    Chen, Junhao
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    Li, Mufan
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    Li, Lin
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    Song, Xiaohui
    In various domains spanning materials synthesis, chemical catalysis, life sciences, and energy materials, in situ transmission electron microscopy (TEM) methods exert a profound influence. These methodologies enable the real-time observation and manipulation of gas-phase and liquid-phase reactions at the nanoscale, facilitating the exploration of pivotal reaction mechanisms. Fundamental research areas like crystal nucleation, growth, etching, and self-assembly have greatly benefited from these techniques. Additionally, their applications extend across diverse fields such as catalysis, batteries, bioimaging, and drug delivery kinetics. However, the intricate nature of ‘soft matter’ presents a challenge due to the unique molecular properties and dynamic behavior of these substances that remain insufficiently understood. Investigating soft matter within in situ liquid-phase TEM settings demands further exploration and advancement compared to other research domains. This research harnesses the potential of in situ liquid-phase TEM technology while integrating deep learning methodologies to comprehensively analyze the quantitative aspects of soft matter dynamics. This study centers on diverse phenomena, encompassing surfactant molecule nucleation, block copolymer behavior, confinement-driven self-assembly, and drying processes. Furthermore, deep learning techniques are employed to precisely analyze Ostwald ripening and digestive ripening dynamics. The outcomes of this study not only deepen the understanding of soft matter at its fundamental level but also serve as a pivotal foundation for developing innovative functional materials and cutting-edge devices.
      4
  • Publication
    Open Access
    Imaging the surface/interface morphologies evolution of silicon anodes using in situ/operando electron microscopy
    (2023)
    Yang, Dahai
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    Ng, Angel Yun Xin
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    Zhang, Kuanxin
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    Chang, Qiang
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    Chen, Junhao
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    Liang, Tong
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    Cheng, Sheng
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    Sun, Yi
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    Shen, Wangqiang
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    Xiang, Hongfa
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    Song, Xiaohui
    Si-based rechargeable lithium-ion batteries (LIBs) have generated interest as silicon has remarkably high theoretical specific capacity. It is projected that LIBs will meet the increasing need for extensive energy storage systems, electric vehicles, and portable electronics with high energy densities. However, the Si-based LIB has a substantial problem due to the volume cycle variations brought on by Si, which result in severe capacity loss. Making Si-based anodes-enabled high-performance LIBs that are easy to utilize requires an understanding of the fading mechanism. Due to its distinct advantage in morphological changes from microscale to nanoscale, even approaching atomic resolution, electron microscopy is one of the most popular methods. Based on operando electron microscopy characterization, the general comprehension of the fading mechanism and the morphology evolution of Si-based LIBs are debated in this review. The current advancements in compositional and structural interpretation for Si-based LIBs using advanced electron microscopy characterization methods are outlined. The future development trends in pertinent silicon materials characterization methods are also highlighted, along with numerous potential research avenues for Si-based LIBs design and characterization.
    WOS© Citations 2Scopus© Citations 5  47  8
  • Publication
    Embargo
    Gradient oxygen-injecting MoS2 nanosheets catalyst boosting reductive C-N coupling of nitroarenes: Mechanistic insight into activity reconstruction
    (2023)
    Dong, Xuexue
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    Yuan, Saisai
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    Marliyana Aizudin
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    Wang, Xuyu
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    Yu, Zhou
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    Song, Heng
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    Yu, Chao
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    Yuan, Aihua
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    Tang, Sheng
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    Yang, Fu
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    It is very appealing to be able to improve the intrinsic activity of a low-cost MoS2 catalyst and broaden the adaptability of substrates in heterogeneous catalytic C-N bond formation from nitro compounds. A gradient oxygen-injection method was used in this study to regulate the electronic structure of the in-plane Mo site in the inert basal plane of the 2H-MoS2 nanosheet, resulting in a remarkable activity reconstruction in the reductive C-N coupling of nitroarenes with aromatic boronic acids. In the lattice of MoS2, gradient oxygen substitution results in structured changes of the in-plane Mo site, including crystal distortion brought on by asymmetric coordination and additive intergrown interfacial MoS2 and MoO3, which in turn contributes to the synergistic highly-active reactive sites of MoS2. Additionally, the interesting secondary activity reconstruction of the catalyst in the toluene solvent during the reaction can replace partial S sites with reactive intermediate oxygen, which results in a subsequent improvement in activity of the used catalyst. The effectiveness of the modified catalyst and the crucial role of the introduced oxygen concentration and alternate position around the Mo site of MoS2 in determining the adsorption and activation of nitro compound were validated through the implementation of various reaction experimental controls and density functional theory calculations. The N-O bond of nitrobenzene was specifically made weaker and easier to break by the addition of adjacent oxygen atoms around the Mo center, which aided the subsequent coupling process. Through altering the coordination environment of the active metal in the reductive coupling reaction of nitroarenes, this work offers some novel findings and new insights into the activity reconstruction of Mo-based catalysts.
    WOS© Citations 1Scopus© Citations 1  49