Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 48
·24437-24445
·
IF 7.443
Kai Wang,Gaofeng Teng,Jinlong Yang,Rui Tan,Yandong Duan,Jiaxin Zheng,Feng Pan
We report Sn(II) and Sn(IV) self-selective dual-doping, respectively, on Fe and Si sites of Li2FeSiO4 nanocrystals due to the steric and electronic structure effects of Sn(II,IV). Combined with experimental studies and theoretical calculations, we investigate the structure–property relationship of tin doped Li2FeSiO4 as the cathode material for high performance Li-ion batteries, in which the dual-doping enhances the electronic conductivity and lithium-ion diffusion coefficient. The doped sample with 5% Sn(IV) source shows the best electrochemical performance due to the improved electronic conductivity and Li-ion diffusivity. Density functional theory (DFT) calculations also reveal that tin dual-doped Li2FeSiO4 has better electronic conductivity and lower voltage of delithiation than that of the undoped Li2FeSiO4, which is in accordance with our experimental results.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Junzheng Zhang,Jingjing Shi,Sheng Tao,Lei Wu,Jun Lu
Photocatalytic CO 2 reduction has been viewed as a promising approach to relieve the energy crisis and green-house effect. Cheap and high performance cocatalyst is an effective approach to enhance the photocatalytic activity . Ti 3 C 2 T x (MXene) is a new family of 2D layered materials, which can be served as an electron conductor. In this work, Cu 2 O/Ti 3 C 2 T x heterojunction composites were prepared by in situ hydrothermal growth method. Cu 2 O/Ti 3 C 2 T x with the different percentages of ultrathin Ti 3 C 2 T x (2, 5, 10, 20 and 30 mg) nanosheet in the heterostructured catalysts are noted as CuTi-X (X = 2, 5, 10, 20, 30). As prepared CuTi-10 exhibits the highest photocatalytic CO 2 reaction activity (17.55 μmol·g −1 ·h −1 for CO and 0.96 μmol·h −1 ·g −1 for CH 4 ), which is 3.1 and 4.0 times higher than that of pure Cu 2 O (5.73 μmol·g −1 ·h −1 for CO and 0.24 μmol·g −1 ·h −1 for CH 4 , respectively). The advantage of the in situ growth endows the Cu 2 O/Ti 3 C 2 T x heterojunction contact interface, which is conductive to the separation of photogenerated electrons-hole pairs. The main reason is analysed and can be attributed to that Ti 3 C 2 T x can served as an electron acceptor due to its excellent conductive properties, rendering that more photo generated electrons attend the CO 2 reduction reaction. This provides a strategy to construct the Cu 2 O/Ti 3 C 2 T x heterojunction for photocatalytic CO 2 reduction.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xingrui Tong,Jinhui Wang,Ping Zhang,Pengyang Lei,Yi Gao,Ruirui Ren,Siyu Zhang,Rui Zhu,Guofa Cai
Tungsten trioxide (WO 3 )-based electrochromic devices have attracted great interest in smart windows, low-power displays, and other cutting-edge fields. The electrochromic behavior of WO 3 is strongly dominated by both electron conduction and ion diffusion process. Nevertheless, the structure–activity relationship of the WO 3 in the electrochromism has not been well elucidated so far. Herein, we systematically studied the relationship between the crystal structure composed of the fundamental units of typical WO 3 and the electron conduction/ion diffusion processes at a sub-nanoscale level. Our theoretical results unveil that the h-WO 3 with appropriate band gap by piling up the WO 6 octahedral molecular units along c axis profit electron conduction, and the continuous three-, six-ring tunnels along ab plane built by the units are conducive to ion diffusion. Therefore, the h-WO 3 film exhibits large optical modulation (up to 86% at 633 nm and 90% at 1000 nm), excellent cycling stability (86.4% of retention over 3000 cycles), and fast switching speed (1.9 s of bleaching time at 633 nm). Moreover, we provide unique insights between H + adsorption/desorption and the electrochromic response in the near-infrared region. We believe that this study lays a foundation for the design and construction of high-performance electrochromic nanomaterials and broadband tunable smart windows.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yueying Peng,Yiyong Zhang,Zhipeng Wen,Yunhui Wang,Zhiqiang Chen,Bing-Joe Hwang,Jinbao Zhao
Lithium sulfide (Li 2 S) cathode is considered as a prospective substitution for sulfur-based cathode for as its high specific capacity. Despite this, the poor electron and lithium ion transportation for Li 2 S impedes its further development. Herein, a great electron and lithium ion pathway is constructed for Li 2 S by a facile spray-dried technology. In this composite, the nano-sized Li 2 S is well imbedded in framework composed by the nitrogen/oxygen dual doped carbon nanotube/carbon (Li 2 S/CNT/C-N/O). The electrochemical tests show that the prepared Li 2 S/CNT/C-N/O cathode exhibits great cycling stability and rate capacity. A high initial discharge capacity of 1014 mAh g −1 is achieved with 671 mAh g −1 capacity remained at 200 mA g −1 after 200 cycles. Impressively, a stable capability is still exhibited from 200 to 3000 mA g −1 during rate testing. In-situ electrochemical impedance spectra test is further used to get insightful understanding about the improvements. The result reveals that decreased resistance and increased lithium-ion diffusion can be achieved for the Li 2 S/CNT/C-N/O, especially at the initial charging stage of polysulfides nucleation, which shed light on the improved reactive kinetics and active material utilization.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Huijuan Wu,Lili Chen,Suiting Ning,Xiaodie Zhao,Shuping Deng,Ning Qi,Feng Ren,Zhiquan Chen,Jing Tang
In this paper, Ga-doped In2O3 (IGO) was synthesized using a hydrothermal method combined with spark plasma sintering (SPS) treatment. Nanosized pore structures were successfully introduced into IGO. A high porosity of 67.2% is obtained in the In1.82Ga0.18O3 sample consolidated by SPS sintering at a relatively low temperature of 500 °C. With further increasing sintering temperature, the porosity decreases gradually and reaches 10.1% at 1000 °C. Positron annihilation measurements confirm the decrease of porosity in IGO with increasing sintering temperature and reveal that there are still considerable amounts of nanopores even after sintering at 1000 °C. The nanopores in IGO act as strong phonon scattering centers, which lead to an extremely low thermal conductivity of 0.21 W m–1 K–1 at room temperature for IGO sintered at 500 °C. This thermal conductivity is nearly 2 orders of magnitude lower than that of the fully densified bulk In2O3 and is also the lowest value reported so far. Although the electrical conductivity of IGO is deteriorated by the pore structure, it is overcompensated by the extremely low thermal conductivity. As a result, a high ZT of 0.383 is obtained at 800 °C in this sample. Our results indicate that the pore structure can be a competitive strategy to achieve a high ZT value for thermoelectric materials.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qiubo Lan,Jinxu Ma,Siyuan Li,Kepi Chen,Cuiwei Li,Linan An
Since high-entropy oxide has a huge compositional space, it is urgent to develop efficient methods to quickly find the compositions that can form single-phase materials. In this paper, taking (Ce, Zr, Hf, Yb, Nb)O 2 system as an example, we carried out the design and preparation of high-entropy fluorite oxides (HEFOs) by constructing a R ‾ -S diagram. Three single-phase HEFOs have been successfully design and synthesized. The impedance measurement showed that the three materials are electronic conductors, which exhibited relatively low thermal conductivities ranging between 1.6 W/m·K ∼1.9 W/m·K. The current study suggests that R ‾ -S diagram is a useful tool for quickly selecting compositions that can form single-phase high-entropy oxides.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Jiandongyong Liu,Xu Yu,Jingze Bao,Chuan-Fu Sun,Yafeng Li
Carbon-supported SnS composite was prepared via a solvothermal process followed by thermal calcination . The carbon nanosheets could not only ensure electron conduction within the composite but also alleviate the volume change of SnS during the charging/discharging process. As a result, when employed as an anode material for potassium-ion batteries, the composite delivers good potassium storage performance. In detail, at a current density of 100 mA g −1 , its capacity is still higher than 102.6 mAh g −1 after 50 cycles. In terms of long-cycling stability, 76.1 mAh g −1 was obtained after 200 cycles at 200 mA g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2019
·
IF 13.903
Dongdong Jin,Jiangfan Yu,Ke Yuan,Li Zhang
In nature, social insects are capable of self-organizing into various sophisticated and functional structures through local communications, which facilitate their cooperative accomplishment of complex tasks that are beyond the capabilities of individuals. Emulating this collective behavior in artificial robotic systems promises benefits in various engineering fields and has been partially realized through elaborate algorithm and physical designs. However, developing a swarm robotic system with group-level functionality at small scales remains a challenge. Herein, a microswarm system that mimics the structure and function of an ant bridge is realized by employing functionalized magnetite nanoparticles, which are paramagnetic and electrically conductive, as the building blocks. Through the application of a programmed oscillating magnetic field, the building blocks are reconfigured into a ribbon-like microswarm, which can perform reversible elongation with a high aspect ratio and, thus, is capable of constructing a conductive pathway for electrons between two disconnected electrodes with the bodies of functionalized nanoparticles. Furthermore, the microswarm is demonstrated to serve as a microswitch, repair broken microcircuits, and constitute flexible circuits, exhibiting a promising future for the practical applications in the electronics field.
研究领域:
材料科学
·
生物启发工程
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Carbon Energy
·
2023
·
IF 20.5
Zhichao Jia,Yang Yuan,Yanxing Zhang,Xiang Lyu,Chenhong Liu,Xiaoli Yang,Zhengyu Bai,Haijiang Wang,Lin Yang
Transition-metal oxyhydroxides are attractive catalysts for oxygen evolution reactions (OERs). Further studies for developing transition-metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next catalysts. Herein, Mo-doped CoOOH was designed as a high-performance model electrocatalyst with durability for 20 h at 10 mA cm −2 . Additionally, it had an overpotential of 260 mV (glassy carbon) or 215 mV (nickel foam), which was 78 mV lower than that of IrO 2 (338 mV). In situ, Raman spectroscopy revealed the transformation process of CoOOH. Calculations using the density functional theory showed that during OER, doped Mo increased the spin-up density of states and shrank the spin-down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process, which simultaneously optimized the adsorption and electron conduction of oxygen-related intermediates on Co sites and lowered the OER overpotentials. Our research provides new insights into the methodical planning of the creation of transition-metal oxyhydroxide OER catalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Ting Yan,Ye Tan,Zhihong Zhou,Haixia Tong,Linping Yu,Zhiming Sun,Julan Zeng
Metal free carbon materials such as graphene, diamond, and carbon nanotubes are becoming alternative catalysts for peroxymonosulfate（(PMS）activation to avoid drawbacks of traditional transition metal-containing catalysts, such as leaching of metal ions and harshing usage environments. However, these new catalysts have drawbacks such as complex processes and high synthesis costs. Herein, in this study, graphite with a unique "multilayer cake" structure was prepared as an efficient peroxymonosulfate (PMS) activator to degrade the antibiotic in the wastewater. Specifically, Specifically, by optimizing the spacing between graphite layers, the expanded graphite (EG) exhibited exceptional performance, achieving over 80% removal of tetracycline (TC) molecules within 15 mins. The enhancement of PMS activation ability is attributed to the enhanced electronic conductivity and adsorption capacity of EG. Notably, the electron-donating capability of EG facilitates a degradation mechanism dominated by singlet oxygen ( 1 O 2 ) rather than conventional free radicals (SO 4 •− , •OH), imparting the system with enhanced environmental adaptability. Furthermore, the facilitated electron transfer between pollutants and EG accelerates degradation. Compared with reported，The inherent hydrophobicity and excellent stability of graphite enable self-separation and reusability, ensuring cost-effectiveness and practicality. Collectively, this study highlights the promising application of the highly self-separating "multilayer cake" structured EG catalyst as a low-cost, high-efficiency PMS activator, offering valuable insights into the practical deployment of carbon-based materials in Fenton-like catalytic systems.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ying Zhou,Xiangru Sun,Peiran Tan,Qi Chen,Huateng Song,You Zhang,Yan Han,Dejun Li
Lithium (Li) metal is considered to be one of the most promising anodes for next-generation high-energy-density batteries owing to its high theoretical capacity and low redox potential. However, the practical application of Li metal anodes has been hindered by the unstable interface and the growth of Li dendrites. Herein, a highly stable surface-patterned Li metal anode has been developed, in which composite nanowires composed of lithium phosphide and copper nanoparticles are riveted within the regular grooves of the Li metal surface. The lithiophilic and mixed ion/electron-conducting composite nanowires in the grooves effectively accelerate the charge transfer kinetics and regulate the lithium-ion distribution, enabling a highly reversible Li plating/stripping process within the grooves. Benefiting from this design, the obtained Li metal anodes achieve excellent cyclability for over 3000 h at 1 mA cm −2 /1 mAh cm −2 with a low overpotential of 20.3 mV. Furthermore, when coupled with commercial LiNi 0.6 Co 0.2 Mn 0.2 O 2 cathodes, the cells achieve excellent cycling stability for over 600 and 400 cycles at 0.5 and 2 C, respectively. This study may provide a viable strategy to develop high-performance Li metal batteries through the facile design of Li metal anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 15
·10390-10396
·
IF 3.9
Bang Li,Guangfu Li,Qiqi Wan,Lei Yuan,Yingying Liu,Longxu Li,Xiaodong Zhuang,Junliang Zhang,Changchun Ke
Proton exchange membrane water electrolysis (PEMWE) is a promising technology for green hydrogen production. However, its large-scale commercial application is limited by its high precious metal loading, because low catalyst loading leads to reduced electron transport channels and decreased water transportation, etc. Herein, we study the electrode level strategy for reducing Ir loading by the optimization of the micro-structure of the anode catalyst layer via SnO2 doping. The pore structure and electron conductive network of the anode catalyst layer can be simultaneously improved by SnO2 doping, under appropriate conditions. Therefore, mass transfer polarization and ohmic polarization of the single cell are reduced. Moreover, the enhanced pore structure and improved electron conduction network collectively contribute to a decreased occurrence of charge transfer polarization. By this strategy, the performance of the single cell with the Ir loading of 1.5 mg cm−2 approaches the single cell with the higher Ir loading of 2.0 mg cm−2, which means that SnO2 doping saves about 25% loading of Ir. This paper provides a perspective at the electrode level to reduce the precious metal loading of the anode in PEMWE.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）