JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Yajun Zhao,Ke Meng,Teng Luo,Mengxu Chen,Shuai Niu,Cong Lin,Xianjun Xing,QinChun Yang,Xianghua Kong,Dawei Zhang,Hao Luo
The significant challenge faced by Li–O 2 batteries (LOBs) lies in their slow oxygen reduction and evolution kinetics, which greatly necessitates the development of highly active catalysts. Herein, we report a high-performance oxygen cathode (RuCo-NC) that is achieved by uniformly dispersing the nanoalloy of noble metal Ru and transition metal Co on the three-dimensional (3D) nanoporous carbon. Density functional theory (DFT) calculations reveal a prominent electron transfer process between Ru and Co, along with a substantial abundance of electron transfer sites on RuCo-NC. These characteristics contribute to a strong positive equilibrium effect on the formation and decomposition of Li 2 O 2 , which is crucial for LOBs. Furthermore, the calculated Gibbs free energy change during the oxygen reduction and evolution processes indicates that RuCo-NC exhibits the smallest overpotential compared to single metal catalysts . As a result, this RuCo-NC cathode enables the resulting LOB with a larger discharge specific capacity, lower overpotential for efficient oxygen reduction and evolution, and excellent cycling stability. This work introduces an effective method for fabricating nanoalloy catalysts with enhanced efficiency, promising advancements in energy applications .
研究领域:
材料科学
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电化学
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能源存储与转换
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bohua Li,Jingning Lai,Fengling Zhang,Wen Sun,Zhengqiang Hu,Boshun Gui,Nan Chen,Li Li,Feng Wu,Renjie Chen
LiI in Li-O 2 batteries has shown promise in reducing charge overpotential. However, the shuttle effect of oxidated iodine species (OISs) can lead to lithium metal corrosion and loss of OISs. During the discharging process, these iodine species can undergo side reactions, resulting in the accumulation of LiOH and other parasitic products, which in turn accelerates battery failure. In this work, we have drawn inspiration from mussel protein and utilized a simple co-deposition method to form a robust biomimetic functionalized coating on the surface of the glass fiber separator. This was achieved by grafting catechol/polyamine (CA/PA) with 11-mercaptoundecanoic acid (MUA). This separator exhibits strong electrostatic repulsion towards negatively charged OISs and, conversely, electrostatic attraction towards Li + , this dual action effectively suppresses the shuttle effect and facilitates Li + transport. When equipped with this modified separator, the Li-O 2 battery effectively reduces the accumulation of LiOH and demonstrates significantly enhanced rate performance and cycle stability. Our findings provide a versatile approach for the design of modified separators for Li-O 2 batteries with redox mediators (RMs).
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Dan Li,Fu Sun,Yuqing Zhang,Yulong Liu,Hao Sun,Haiming Xie,Jia Liu,Seung-Taek Myung,Jiefang Zhu
In situ characterization on interface stability has been hardly tried in redox mediator (RM)-involved Li-O 2 battery thus far. Here, benzyltriethylammonium iodide (BTEAI) can act as a self-defensive RM in the electrolyte LiTFSI/TEGDME to enhance the reaction kinetics and increase the cycling stability by suppressing the redox shuttling. I - effectively reduces the charging overpotential by changing decomposition route for Li 2 O 2. BTEA + can facilitate LiTFSI decomposition in the electrolyte, and participate in formation of an organic–inorganic composite SEI-contained layer on Li anode. Moreover, for the first time, non-destructive synchrotron X-Ray tomography is used to investigate the mechanism of suppressing shuttle effect by monitoring the morphological evolution of electrodes interface. This work provides an insight into the development of functional RM and in situ protection strategies for Li anodes in Li-O 2 batteries.
研究领域:
材料科学
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电化学
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能源存储技术
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Zhe Li,Xiaohui Wang,Xiuli Fu,Jinhua Liu,Yuanan Liu,Hongxin Zhang
The pH and O 2 are the two important parameters to evaluate environmental conditions, healthcare, and industrial processes. Herein, we developed a ratiometric fluorescent capillary-based dual-functional sensor for simultaneous monitoring of pH and O 2 fluctuations. The fluorescent sensor consists of a pH sensing unit and an O 2 sensing unit on both ends of the capillary inner wall. The ratiometric fluorescent pH sensing unit includes pH-sensitive probe HPTS and the reference dye Ce6, while the O 2 sensing unit is composed of O 2 -sensitive probe RuDP and the reference dye C6. Under single-wavelength excitation at 430 nm, the ratiometric fluorescent dual-functional sensor exhibits highly sensitive, selective and reproducible responses to both pH and O 2 . As for practical aqueous samples, the results about pH and O 2 levels obtained by our sensor are considerable consistent with commercial devices. Meanwhile, the dynamic changes of pH and O 2 levels during glucose catalysis by glucose oxidase can be detected in real-time and accurately. The dual-functional ratiometric fluorescent capillary transducer provides a significant potential platform for environmental monitoring and medical diagnosis.
研究领域:
生物医学工程
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环境科学
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化学传感
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
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2024
·
IF 6.2
Bo Ma,Zhiqin Wen,Jiedong Qin,Taoyi Lu,Li Tang,Zhenyu Wu,Yuhong Zhao
In this paper, in order to improve the mechanical properties of high-entropy fluorite oxides (HEFOs), five equimolar multicomponent oxides were synthesized by solid-phase reaction method by using element Y replacing one of the five cations in (Ce 0.2 Zr 0.2 La 0.2 Sm 0.2 Nd 0.2 )O 2- δ . The substitution of La, Sm or Nd in (Ce 0.2 Zr 0.2 La 0.2 Sm 0.2 Nd 0.2 )O 2- δ with Y element are able to form single-phase HEFOs at 1600 °C, while Ce 4+ and Zr 4+ replaced by Y 3+ contains a large number of secondary phase. The former three components are almost dense and smooth, and all the elements are uniformly distributed with no obvious segregation and agglomeration. The Ce 3+ concentration of Y-substituted Sm HEFOs is calculated to be 13.7%, yielding a nominal composition of (Ce 0.2 Zr 0.2 Y 0.2 Sm 0.2 Nd 0.2 )O 1.6863 . In addition, the HEFOs have the best mechanical properties with Vickers hardnesses, flexural strengths and fracture toughnesses of 15.12 GPa, 101.1 MPa and 7.88 MPa-mm 1/2 , respectively, which have potential applications in high-performance structural materials.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
ChemElectroChem
·
2025
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IF 3.5
Haoshen Huang,Huafeng Zhou,Nuowen Wu,Haiyang Yu,Weibo Gao,Jianghuan Shi,Jiahao Song,Yayun Zheng,Zhengfei Chen,Zixuan Liu
Graphical A simple carbon black (Ketjenblack, KB)-multiwall carbon nanotubes (MWCNTs) composite was fabricated and used as the air cathode in a Li-O 2 battery, achieving significantly improved specific capacity (up to 10611 mAh/g carbon ), rate capability and cyclability than pristine KB, owing to the synergy of KB's abundant surface area for accommodation of discharge products and MWCNTs’ long-range electronic conductivity. A simple carbon black (Ketjenblack, KB)-multiwall carbon nanotubes (MWCNTs) composite was fabricated and used as the air cathode in a Li-O 2 battery where MWCNTs primarily serve as microscopic cables to enhance long-range electronic conductivity. With optimal KB:MWCNTs mass ratios, the composite exhibited significantly improved specific capacity (up to 10611 mAh/g carbon under 100 mAh/g carbon ), rate capability (up to 9598 mAh/g carbon under 500 mAh/g carbon ) and cyclability than pristine KB, owing to the synergy of KB's abundant surface area for accommodation of discharge products and MWCNTs’ long-range electronic conductivity to guide even and compact deposition of discharge products, and mitigate passivation/clogging of the air cathode surface during discharge. This strategy of using MWCNTs as microscopic cables could also be applied for other commercial materials to construct high-performance and low-cost air cathodes.
研究领域:
材料科学
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能源存储技术
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2011
·Vol. 14
·期 1
·130-135
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IF 5.472
Bin Li,An-Hua Liu,Liang-Nian He,Zhen-Zhen Yang,Jian Gao,Kai-Hong Chen
Readily available iron compounds were found to be active catalysts for the selective oxidation of sulfide to sulfoxide with molecular oxygen as the oxidant in polyethylene glycol (PEG). As an indispensable component, PEG had a great promotive effect on the reaction. Notably, high conversion (>99%) along with excellent chemo-selectivity of up to 94% could be attained by using Fe(acac)2 as the catalyst at 100 °C. This methodology was proved to be applicable for the transformation of various aromatic and aliphatic sulfides into the corresponding sulfoxides with high selectivity. PEG is considered to play a crucial role in stablizing the Fe(IV)-oxo species formed in situ which is supposed to be responsible for the sulfide oxidation.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2026
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IF 9.6
Yanping Li,Lizheng Chen,Tao Gan,Wenjuan Zhang,Xuefeng Chu,Wenxiang Zhang,Gang Liu
Defect engineering plays a crucial role in activating molecular oxygen by modulating the local electronic and geometric structures of active sites. However, defects in metal-free materials have received comparatively little attention in this context, particularly under thermal conditions, despite reports of the favorable electron-donating properties. To systematically compare how different vacancies modulate catalytic behavior, we prepared platinum (Pt) nanoparticles supported on nearly pristine carbon nitride with minimal vacancies (CN), carbon nitride with carbon vacancies (Cv-CN), and carbon nitride with nitrogen vacancies (Nv-CN). Combined experimental and theoretical analyses reveal that carbon vacancies induce stronger electron localization than nitrogen vacancies, resulting in a significant increase in electron density at Pt sites. The synergistic interaction between Pt atoms and adjacent nitrogen atoms surrounding carbon vacancies facilitates electron donation to the π* antibonding orbitals of adsorbed O 2 , thereby enhancing O 2 activation. Consequently, Pt supported on Cv-CN (Pt/Cv-CN) achieves a light-off temperature ( T 50 , the temperature for 50% toluene conversion) of 185 °C with only 0.1 wt% Pt, substantially lower than those of Pt supported on Nv-CN (Pt/Nv-CN, 202 °C) and Pt supported on CN (Pt/CN, 210 °C). This work elucidates the critical role of carbon vacancies in optimizing the electronic environment of carbon nitride and enhancing oxygen activation at the Pt-support interface, thereby providing a systematic strategy for designing high performance catalysts with minimal noble metal loading.
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PubMed
高影响因子
ADVANCED MATERIALS
·
2012
·Vol. 24
·期 38
·5205-5211
·
IF 13.877
Fang Yang,Sunling Hu,Yu Zhang,Xiaowei Cai,Yan Huang,Feng Wang,Song Wen,Gaojun Teng,Ning Gu
Graphical It is found that Prussian Blue nanoparticles (PBNPs) possess a catalase-like activity to catalyse the breakdown of H 2 O 2 into oxygen (O 2 ) molecules under the neutral conditions (pH = 7.4). Based on this finding, we have developed a new strategy in which PBNPs can be excellent ultrasound (US) and magnetic-resonance (MR) dual modality imaging contrast agents for H 2 O 2 diagnostics in vitro and in vivo.
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DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Liu Qiong,Chen Tianxiang,Lo Tsz Woon Benedict,Wang Fuxian,Ouyang Gangfeng
Photocatalytic reduction of O 2 to H 2 O 2 is generally regarded to proceed through the *O 2 hydrogenation pathway (*O 2 → *OOH), which inevitably encounters a high energy barrier proton extraction process via cleavage of the H-O bond in H 2 O. Designing a K and Cs co-modified polymeric carbon nitride (CN-KCs) to create dual-end adsorption sites as frustrated Lewis pairs for O 2 , on which the O-O breaking energy is significantly reduced and a *O 2 dissociation pathway towards photocatalytic H 2 O 2 synthesis is realized (*O 2 → 2*O, then *O + *H 2 O → H 2 O 2 ). The CN-KCs presents a competitive photocatalytic H 2 O 2 yield of 1806.6 μmolh −1 , a high quantum efficiency of 72.3% at 420 nm, and a solar-to-H 2 O 2 conversion efficiency of 6.1% with presence of biomass derivative. Here, we show that regulating dual-end adsorption sites opens a door to new *O 2 dissociation avenue for efficient conversion of O 2 to H 2 O 2 .
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xiujing Lin,Tingting Zhang,Chengcheng Chu,Zhuang Li,Ruiqing Liu,Pan Li,Yi Li,Zhendong Huang,Yanwen Ma
Lithium–oxygen (Li–O2) batteries, profiting by their super high theoretical energy density and oxygen-breathing electrodes, have attracted extensive concern. The synthesis of the electrode materials with high conductivity and promising cycling durability will be a critical aspect for Li–O2 batteries. In this article, a hybrid composite of CoS2 nanocages derived from ZIF-67 and interconnected by carbon nanotubes (CoS2/CNTs) is prepared and used in the air electrode fabrication for Li–O2 batteries. A reversible capacity of 2398.9 mAh g–1 is obtained, equivalent to 90% of the discharge capacity. When restricting the cycling capacity to 500 mAh g–1, the battery exhibits cycling stability for 52 cycles, with the cutoff potential keeping above 2.0 V. The key point of this material is the formation of porous CoS2 nanocages and insertion of the nanocages with CNTs, forming interconnected electrically conducting networks. The incorporation of CNTs serves as channels for fast electron transfer, which overcomes the poor conductivity of CoS2. Furthermore, the porous CoS2 nanocages could provide affluent active sites for an oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which also facilitates the diffusion of O2 and the infiltration of electrolytes. The combination of highly conductive CNTs and CoS2 with efficient catalytic activity renders improvement in the battery performance.
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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电池技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Pengfei Wang,Qing Xia,Yuncheng Zhou,Xueqian Ji,Hailan Feng,Yuxing Xu,Jun Yang,Qiangqiang Tan
The nickel-rich cathode materials (LiNi 0.8 Co 0.15 Al 0.05 O 2 , NCAs) in Lithium ion batteries often suffer from oxygen loss problems under partially overcharged conditions (>4.3 V), leading to capacity fading and safety problem. Herein, we utilize a facile ball-milling method to coat the NCAs with a shell of cerium aluminum composite oxide (CeO 2 -Al 2 O 3 ), which is commonly used as oxygen storage material. Proved by in situ X-ray diffraction results, the coating CeO 2 -Al 2 O 3 layer is capable to suppress the lattice volume change and irreversible phase transition of NCAs. The CeO 2 -Al 2 O 3 coating layer can adsorb released oxygen under overcharged conditions and replenish lattice oxygen of NCAs under oxygen-leaned conditions. The protective layer can also prevent dissolution of the transition metals caused by HF attack in electrolytes. As a result, the as prepared electrode presents high specific capacity of 186.4 mA h g −1 and excellent cycle stability with capacity retention of 94.1% after 300 cycles at a rate of 0.5 C under overcharged conditions (3.0–4.5 V). Coating CeO 2 -Al 2 O 3 is an efficient strategy to solve capacity fading problem and safety problem caused by partially overcharge, and such strategy shows significant promise for practical applications.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
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