JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chang Sun,Kun-Yan Zhao,Ming-Lu Huang,Cheng-Long Luo,Xu-Dong Chen,Hongjing Wu,Ming Wang
Reasonable heterointerface modification can effectively regulate and enhance the microwave absorption of electromagnetic materials. The surface of magnetic permalloy (PM) microparticles is modified herein by coating double-layer metal organic frameworks (MOF), which are composed of a 2-methylimidazole cobalt salt (ZIF-67) layer and a 2-methylimidazole zinc salt (ZIF-8) layer. A stable heterointerface structure with cobalt/carbon (Co/C) and zinc/carbon (Zn/C) layers is formed on the surface of PM microparticles after pyrolysis. These particles include two types of composite particles of PM solely encapsulated by ZIF-67 or ZIF-8, PM@ZIF67 and PM@ZIF8, respectively, and two types of composite PM particles with a double-layered MOF outer shell structure obtained by exchanging the coating sequence (PM@ZIF8@ZIF67 and PM@ZIF67@ZIF8). Furthermore, the thermal decomposition temperature has a significant impact on the surface morphology and magnetic properties of the composite particles. After pyrolyzing at 500 °C, the PM@ZIF67@ZIF8 samples exhibit the highest microwave absorption performance among these samples. Specifically, the minimum reflection loss and effective absorption bandwidth of PM@ZIF67@ZIF8 after pyrolyzing at 500 °C can reach −47.3 dB at a matching thickness of 3.8 mm and 5.3 GHz at a matching thickness of 2.5 mm, respectively. A heterointerface with an electrical field orientation is created in the PM@ZIF67@ZIF8 particles, which effectively enhances the interface polarization and dipole polarization. Furthermore, the formation of a three-dimensional carbon network after pyrolysis is also useful for optimizing impedance matching and enhancing magneto-electric synergism.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 6
·1338-1348
·
IF 5.726
Jinchao Wang,Wenfeng Han,Shucheng Wang,Haodong Tang,Wucan Liu,Ying Li,Chunshan Lu,Jianjun Zhang,Eric M. Kennedy,Xiaonian Li
Catalytic coupling of CH4 with potent greenhouse gas CHF3 to vinylidene fluoride (VDF) was investigated over composite catalysts. Carbon-partitioned LaF3–BaF2 catalysts were prepared by PVDF (polyvinylidene fluoride)-mediated calcination. During catalyst preparation, PVDF functions as the fluorine source and carbon source. Compared with the catalysts prepared by the conventional HF co-precipitation method, the transformation of LaF3 and BaF2 to Ba1−xLaxF2+x solid solution is inhibited as Ba and La are separated by carbon layers derived from the decomposition of PVDF. The Ba1−xLaxF2+x phase is not favorable for the coupling of CH4 with CHF3 to VDF. In addition, PVDF-mediated calcination facilitates the formation of LaOF which is one of the key species for coupling of CH4 with CHF3 to VDF. O− species, which is the most active oxygen species for the activation of CH4, increases significantly following PVDF-mediated calcination due to the formation of LaOF. Consequently, the formation rate of VDF over the catalyst derived from PVDF-mediated calcination is 3.6 times higher than the HF co-precipitation catalyst at a reaction temperature of 700 °C. The formation rate of the HF co-precipitated catalyst declines to nearly half of the initial rate in a time-on-stream of 15 h. By contrast, only slight deactivation is observed over the catalyst prepared by PVDF-mediated calcination. The present work provides a promising strategy for the preparation of composite catalysts.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Sicheng Zhang,Tengfei Duan,Dejian Yan,Hongyun Yang,Lingling Cheng,Yong Pei,Kuiyi You,He'an Luo
Charge recombination at the interface of oxygen evolution catalyst (OEC) and BiVO 4 -based photoanode is one of the great challenges to achieve efficient photoelectrochemical (PEC) water splitting due to the poor charge transfer and separation efficiency of BiVO 4 . Herein, a composite photoanode (NiFe/C-Mo:BiVO 4 ) consisting of a molybdenum doped BiVO 4 photoanode, an OEC interfacial layer of NiFeOOH and a tailorable hole transfer layer (HTL) made of glucose-derived carbon in between, was designed and fabricated for highly efficient PEC water splitting. The composite NiFe/C-Mo:BiVO 4 photoanode exhibited the photocurrent density of 5.62 mA cm −2 at 1.23 V RHE and an outstanding photo-stability. Characterization and photoelectrochemical analyses revealed that the inserted carbon HTL, though not active for surface water oxidation kinetics, greatly suppressed the unwanted recombination of electron-hole pairs and drastically improved the transfer and storage of charge carriers at the OEC/BiVO 4 interface. A surface charge separation efficiency of 89 % at 1.23 V RHE and remarkable hole storage properties were obtained. This work afforded a novel approach to the design of low-cost and sustainable HTL integrated photoanodes for efficient PEC water oxidation.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yao Liu,Wen-Bei Yu,Bai-Xiang Xu
Coating the carbon layer onto the surface of TiO 2 electrode is seen as an effective strategy to improve the electrochemical performance of lithium-ion batteries , particularly the reduced charge transfer resistance . The reduced charge transfer resistance was attributed to the chemical bonding between the phases. In this paper, however, we show that it is not only the chemical bonding but also the change of the activation energy differences that is responsible. Herein, we fabricate the carbon layer coated TiO 2 electrode (TiO 2 /C) and combine the recently proposed modified Planck-Nernst-Poisson coupled Frumkin-Butler-Volmer (MPNP-FBV) model to address the above-mentioned issues. By combining the experimental results with the electrochemical model, the charge transfer resistance and the interface behaviors are analyzed. The results show that the performance of TiO 2 /C electrode based cells is determined by the carbon layer/TiO 2 interface, while the cells based on TiO 2 electrodes are limited by the electrolyte/TiO 2 interface. Comparison between the electrochemical simulations and the experimental data indicates that this increased activation energy difference leads to the decrease of the charge transfer resistance. These results imply that activation energy difference across the interfaces can be a critical parameter for designing high performance batteries .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 8
·1316
·
IF 2.467
Shuai Wang,Jia Wang,Ping Li,Zexing Wu,Xien Liu
Efficient electrocatalyst plays a significant role on the development of hydrogen energy. In this work, an N,P-codoped carbon layer coupled with MoP nanoparticles (MoP/NPCs) was prepared through a facile high-temperature pyrolysis treatment. The obtained MoP/NPCs presented efficient activity for hydrogen evolution reaction (HER), with low onset potential of 90 mV, and a small Tafel slope (71 mV dec−1), as well as extraordinary stability in acidic electrolyte. This work provides a new facile strategy for the design and synthesis of sustainable and effective molybdenum-based electrocatalysts as alternatives to non-Pt catalysts for HER.Keywords:electrocatalysts;hydrogen evolution reaction;carbon layer;molybdenum phosphide
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2017
·Vol. 13
·期 47
·1701993
·
IF 8.643
Yong Cheng,Qian Li,Chunli Wang,Lianshan Sun,Zheng Yi,Limin Wang
Due to the high theoretical capacity as high as 1494 mAh g −1 , SnO 2 is considered as a potential anode material for high-capacity lithium–ion batteries (LIBs). Therefore, the simple but effective method focused on fabrication of SnO 2 is imperative. To meet this, a facile and efficient strategy to fabricate core–shell structured C/SnO 2 hollow spheres by a solvothermal method is reported. Herein, the solid and hollow structure as well as the carbon content can be controlled. Very importantly, high-yield C/SnO 2 spheres can be produced by this method, which suggest potential business applications in LIBs field. Owing to the dual buffer effect of the carbon layer and hollow structures, the core–shell structured C/SnO 2 hollow spheres deliver a high reversible discharge capacity of 1007 mAh g −1 at a current density of 100 mA g −1 after 300 cycles and a superior discharge capacity of 915 mAh g −1 at 500 mA g −1 after 500 cycles. Even at a high current density of 1 and 2 A g −1 , the core–shell structured C/SnO 2 hollow spheres electrode still exhibits excellent discharge capacity in the long life cycles. Consideration of the superior performance and high yield, the core–shell structured C/SnO 2 hollow spheres are of great interest for the next-generation LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Jiahuan Luo,Jing Wang,Yao Guo,Jiawei Zhu,Huihui Jin,Zhiwei Zhang,Daojun Zhang,Yongsheng Niu,Shaogang Hou,Jimin Du,Daping He,Yuli Xiong,Lei Chen,Shichun Mu,Yunhui Huang
Hydrogen generation from electrical water splitting has become a greatly increasing requirement for energy systems, however, highly effective and durable electrocatalysts towards universal-pH hydrogen evolution reaction (HER) remain a big challenge. Herein, we design and synthesize ruthenium di-phosphide (RuP 2 ) confined in carbon layers (RuP 2 -C) with a unique yolk-shell structure (RuP 2 -C@RuP 2 -C) from MOF . As expected, it not only exceeds the HER activity of Pt catalysts, with very tiny overpotentials at 10 mA cm −2 (9 and 17 mV in 1.0 M KOH and 0.5 M H 2 SO 4 , individually), but also has high stability. Besides, it also exhibits a low overpotential (40 mV) close to Pt catalysts and high stability in 1.0 M PBS, indicating that RuP 2 -C@RuP 2 -C (RPC@RPC) owns outstanding HER performance at all pH values. Density functional theory (DFT) calculation results further unravel that the P-site on the surface of RPC@RPC possesses low hydrogen adsorption energy, beneficial for boosting the HER activity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Dong Xiang,Xiangjie Bo,Xiaohui Gao,Chunmei Zhang,Cheng Du,Fuqin Zheng,Zhihua Zhuang,Ping Li,Liande Zhu,Wei Chen
As a crucial reaction of electrochemical water splitting, oxygen evolution reaction receives intensive and significant attention in recent years. Here, we develop a type of electrocatalyst with core@shell structure in the form of binary FeNi alloy nanoparticles coated by highly defective nitrogen-doped carbon shell with mesoporous architecture. The composite annealed at 800 °C with Fe/Ni ratio of 1:2 presents extremely high catalytic activity and durability for oxygen evolution in 1.0 M KOH electrolyte, which delivers a low overpotential of 273 mV to achieve a current density of 10 mA cm −2 and a small Tafel slope of 37.82 mV dec −1 . We find that appropriate Fe-doping to regulate the surface electronic structure around the active sites is responsible for boosting the electrocatalytic performance. Remarkably, hydroxyl groups introduced along with the Fe doping, acting as an active O radical to facilitate the adsorption of intermediates, are identified as another decisive factor to promote the intrinsic activity for the oxygen evolution reaction. Moreover, such an N-doped carbon shell endows the composite with enriched defects, high conductivity and satisfactory stability, favoring fast electron transfer kinetics. The substantially high catalytic performance of the fabricated binary metallic electrocatalyst makes it potential application in energy storage and conversion devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2018
·Vol. 9
·期 1
·1803035
·
IF 21.875
Peng Ge,Sijie Li,Laiqiang Xu,Kangyu Zou,Xu Gao,Xiaoyu Cao,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji
As a result of its high-energy density, metal–selenides have demanded attention as a potential energy-storage material. But they suffer from volume expansion, dissolved poly-selenides and sluggish kinetics. Herein, utilizing' thermal selenization via the Kirkendall effect, microspheres of NiSe 2 confined by carbon are successfully obtained from the self-assembly of Ni-precursor/PPy. The derived hierarchical hollow architecture increases the active defects for sodium storage, while the existing double N-doped carbon layers significantly alleviate the volume swelling. As a result, it shows ultrafast rate capability, delivering a stable capacity of 374 mAh g −1 , even after 3000 loops at 10.0 A g −1 . These remarkable results may be ascribed to the Ni O C bonds on the interface of NiSe 2 and the carbon film, which leads to the faster transfer of ions, the effective trapping of poly-selenide, and the highly reversible conversion reaction. The kinetic analysis of cyclic voltammetry (CV) demonstrates that the electrochemical process is mainly dominated by pseudocapacitive behaviors. Supported by the results of electrochemical impedance spectroscopy (EIS), it is confirmed that the solid–electrolyte interface films are reversibly formed/decomposed during cycling. Given this, this elaborate work might open up a potential avenue for the rational design of metal-sulfur/selenide anodes for advanced battery systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiangyu Wang,Yiming Wang,Jun Ma,Ping Ning
The wide band gap of g-C 3 N 4 and severe aggregation of Fe 0 adequately limit their applications. To address these two critical issues, novel ternary phosphorus-doped g-C 3 N 4 /Fe 0 @expanded graphite carbon layer (P-CN/Fe 0 @EGC) photocatalyst with extremely narrow band gap and significantly enhanced catalytic activity was in-situ synthesized. P-CN/Fe 0 @EGC hybrid composite exhibited excellent photodegradation performance of tetracycline (TC) removal, which is 5.18 and 1.92 times higher than that of pristine g-C 3 N 4 and Fe 0 , respectively. Enhancement in photocatalytic activity is evaluated via photoluminescence (PL), UV–vis DRS, XRD and electron spin resonance (ESR). A reasonable catalytic mechanism of P-CN/Fe 0 @EGC is proposed. The multiply synergistic mechanisms of phosphorus-doped g-C 3 N 4 (P-CN), Fe 0 and expanded graphite carbon layer (EGC), as well as the strong reducibility of Fe 0 were accounted for the expanded visible light absorption range. The even dispersion of Fe 0 on porous and worm-like structured P-CN/EGC effectively and successfully avoided the decline in photocatalytic activity caused by aggregation of Fe 0 nanoparticles . Compared with g-C 3 N 4 , the band gap of phosphorus-doped g-C 3 N 4 was narrowed from 2.79 to 2.60 eV. It is worth noting that Fe 0 plays an important role in accelerating electron transfer speed and efficiency between P-CN and EGC. The·O 2 − and h + were the dominant active substances for TC degradation . Moreover, P-CN/Fe 0 @EGC catalyst could be used repeatedly for at least 7 cycles with high TC removal efficiency. This study may pave a new way on designing high efficient ternary hybrid photocatalyst for antibiotic degradation.
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
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Yang Zhan,Shao-hua Luo,Jian Feng,Lin Zhang,Xin Liu,Qing Wang,Ya-hui Zhang
The lithium-oxygen batteries (LOBs) have gained extensive interest in the past decade, but are plagued by slow reaction kinetics and induced large-voltage hysteresis. Therefore, developing extremely capable catalysts to enhance catalytic behavior and mitigate oxidation-reduction overpotential of LOBs is of huge challenge and significance. Attributable to their economically friendly and great activity, transition metal oxides (TMO) have incurred lots of attention as alternative electrocatalysts to replace the currently used noble metal-based catalysts. In this work, we fabricate a highly efficient TMO (the MIL-88A heated at 500 °C under protective flow, M8-Fe 3 O 4 @NC-500) electrocatalyst as advanced cathodes, which attributed to its unique structure, numerous dendritic-shaped carbon layer was anchored inplane into the micrometer-long spindle-shaped prisms with evenly distribution and contains abundant Fe–N/Graphitic N active sites. Therefore, the LOBs (based on M8-Fe 3 O 4 @NC-500/AB cathode) deliver superior electrochemical performance with large specific capacities of 14866.1 mAh g −1 , low overpotentials (1.31 V), and steady cycling stability (553 cycles, limited 500 mAh g −1 , under 0.05 mA cm −2 ). Our work provides a novel vision to rationally design and synthesize a powerful TMO electrocatalyst (with the 2D carbon nanosheet coating) for the LOBs cathode.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Tiancheng Wang,Zehao Shi,Furan Wang,Shengrui Cui,Zengqi Zhang,Wei Liu,Yongcheng Jin
The shuttle effect of soluble lithium polysulfides (LiPSs) poses a crucial challenge for commercializing lithium–sulfur batteries. The functionalization of the separator is an effective strategy for enhancing the cell lifespan through the capture and reuse of LiPSs. Herein, a novel In2O3 nanorod with an ultrathin carbon layer (In2O3@C) was coated on a polypropylene separator. The results demonstrate the adsorption and catalysis of In2O3 on polysulfides, effectively inhibiting the shuttle effect and improving the redox kinetics of LiPSs. Besides, the ultrathin carbon layer increases the reaction sites and accelerates the electrochemical reaction rate. The cell with the In2O3@C interlayer displays excellent reversibility and stability with a 0.029% capacity decay each cycle in 2000 cycles at 2C. In addition, the In2O3@C interlayer significantly improves the cell performance under high current (888.2 mA h g–1 at 2C and room temperature) and low temperature (1007.8 mA h g–1 at 0.1C and −20 °C) conditions.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）