NANO
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2016
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IF 0.951
Guoliang Fan,Liu Zhao,Cairong Gong,Jia Ma,Gang Xue
Copper catalysts prepared using two kinds of supports (BaTiO 3 and Fe 2 O 3 @BaTiO 3 ) have been tested for soot combustion. Perovskite-type oxide BaTiO 3 shows excellent properties as support but has small specific surface area. Fe 2 O 3 @BaTiO 3 core/shell microspheres, as improved support of BaTiO 3 support, were fabricated by a hydrothermal-annealing approach. Fe 2 O 3 @BaTiO 3 support has large specific surface area, which optimizes the contact condition of the gas-soot-catalyst three-phase reaction. Due to the Cu-Fe 2 O 3 @BaTiO 3 interaction, the redox properties of copper are improved. Soot combustion is tested under O 2 gas flow and NO x /O 2 gas flow, and Fe 2 O 3 @BaTiO 3 supported copper catalyst (Cu/Fe 2 O 3 @BaTiO 3 ) all shows higher catalytic activity and CO 2 selectivity than BaTiO 3 supported copper catalyst (Cu/BaTiO 3 ) .
研究领域:
催化化学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yongji Xia,Tianle Mao,Xuefeng Jin,Le Wang,Jian Yan,Sheng Lin,Dong-Liang Peng,Zhaoju Yu,Guanghui Yue
The development of efficient catalysts to accelerate the three-phase reaction at the cathode side represents a crucial step in enhancing the performance of lithium-oxygen batteries (LOBs) with high energy density. In this study, NiFe 2 O 4 /CeO 2 composites with an appropriate Ce concentration were prepared as cathode catalysts for LOBs, and the unique micro-flower structure maximally exposed the active sites of the materials. The catalyst cleverly integrates the excellent oxygen evolution reaction (OER) activity of NiFe 2 O 4 and the outstanding oxygen reduction reaction (ORR) activity of CeO 2 . The high concentration of oxygen vacancies and the composite structure synergistically enhanced the charge transfer ability, altered the charge distribution of the active sites, and modulated the electronic structure of the material, thereby achieving an appropriate adsorption energy for oxygen-containing intermediates. Consequently, the composite material displays 343 stable cycles, a round-trip efficiency of 97.8 %, and a discharge specific capacity of 7478 mAh/g. Additionally, it exhibits fast charging and slow discharging capabilities for up to 726 h. This work offers insights into the design of efficient bifunctional cathode catalysts for LOBs.
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
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Jianquan Zhao,Baogang Wang,Mina Luo,Hongsheng Lu
The biggest bottleneck restricting the application of two-dimensional (2D) g-C3N4 material in water lubrication is the large-scale acquisition of g-C3N4 nanosheets with satisfactory water dispersibility. In this work, a gel-like g-C3N4 nanosheet hybrid with g-C3N4 nanosheet cores and organic shells was constructed from the bulk g-C3N4 by three procedures of Hummer’s exfoliation, sulfonation, and acid–base neutralization. The hybrid in water exhibited nice water dispersibility and superior tribological performance. Adding 8 wt % of g-C3N4 nanosheet hybrid made the friction coefficient and wear volume of water reduce by 73.7 and 72.3%, respectively. Moreover, its load-carrying capacity under high load and durability under a long-term test were also impressive. The worn surface analyses reflected that a thick protective lubrication film (>150 nm) was distinctly formed on the surface lubricated by the hybrid aqueous dispersion. This film was actually a tribofilm composed of amorphous tribochemical reaction products (FexOy, FexSy, and Fex(SO4)y) embedded with FexOy and g-C3N4 nanocrystals, which not only remarkably reduced the friction and wear but also effectively restrained the oxidation and corrosion of the friction pair. Given the possibility of large-scale construction and the prominent tribological performance, the g-C3N4 nanosheet hybrid is a promising candidate to be developed as a particularly promising water-based additive.
研究领域:
材料科学
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摩擦学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Yu Wang,Xingbao Zhu,Peng Tan,Yuanguo Wu,Zining Man,Xiangyu Wen,Zhe Lü
Solid-state lithium–oxygen batteries (SSLOBs) with high energy density and enhanced safety are promising for green energy storage but plagued by limited O2/Li+/e– triple-phase reaction zone and high internal resistance. Herein, we design and fabricate a novel SSLOB with an integrated cathode and electrolyte structure in which carbon nanotubes were uniformly coated by an in situ-formed hybrid polymer electrolyte (HPE). This interface engineering builds a three-dimensional hybrid electronic and ionic conductor with sufficient void spaces, which facilitates oxygen diffusion and product accommodation and contributes to a significant expansion of the triple-phase reaction zone. The HPE is prepared in situ from poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), trimethyl phosphate (TMP), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) via weak hydrogen bond interactions and shows a flame-resistant property and high electrochemical stability (until 5.4 V). More importantly, it exhibits both a high ionic conductivity (1.08 × 10–3 S cm–1) and high lithium ion transference number (tLi+ up to 0.73) at ambient temperature, promoting uniform Li deposition. In consequence, the battery displays a gravimetric energy density of 542.1 Wh kg–1 (calculated from the weight of the whole device), superior rate performance, and long cycle life (1000 cycles, 167 days). These systems may promote the practical application of SSLOBs in next-generation energy storage.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF BIOTECHNOLOGY
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2020
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IF 3.503
Chun-Yue Weng,Dan-Na Wang,Shan-Yun Ban,Qiu-Yao Zhai,Xin-Yi Hu,Feng Cheng,Ya-Jun Wang,Yu-Guo Zheng
( S )-2-chlorophenylglycine methyl ester (( S )- 1 ) is a key chiral building block of clopidogrel, which is a widely administered antiaggregatory and antithrombotic drug. Herein, Protease 6SD was covalently immobilized on multi-walled carbon nanotubes (MWCNT), and the as-prepared immobilizate P-6SD@NH 2 -MWCNT was applied in the enantioselective resolution of ( R,S )- 1 to yield ( S )- 1 . In order to overcome the poor solubility of ( R,S )- 1 in aqueous solution, a novel triphasic reaction system constituting P-6SD@NH 2 -MWCNT, aqueous phase and methyl tert -butyl ether (MTBE) as the organic phase was constructed, which simultaneously improved the substrate solubility and the immobilizate recyclability. Under the optimized reaction conditions, P-6SD@NH 2 -MWCNT catalyzed 10 mM ( R,S )- 1 for 2 h, yielding optically pure ( S )- 1 (>99.0 % ee s ) with 70.74 % conversion of the ( R,S )- 1 . Moreover, P-6SD@NH 2 -MWCNT can be reused for 15 batches, displaying an exquisite recycling performance. It is for the first time that enantiomerically pure ( S )- 1 was successfully synthesized by protease-catalyzed one-step resolution.
研究领域:
生物化学
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制药工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Xiao Chen,Senran Hao,Tengda Lu,Mian Li,Lina Han,Peng Dong,Jie Xiao,Xiaoyuan Zeng,Yingjie Zhang
Direct carbon solid oxide fuel cell (DC-SOFC) is a potential and prospective technology to convert chemical energy from real-world coal fuels into electricity with environment friendliness and high efficiency. However, the limited three-phase reaction boundaries and the challenge of sluggish carbon oxidation activity have always hindered the development and application of DC-SOFCs. On this account, here vanadium-doped B-site-deficient La 0.5 Sr 0.5 FeO 3-δ (LSFV x , x = 0, 0.05, 0.10, 0.15) perovskite materials are synthesized and developed as the anode of DC-SOFCs for brown coal utilization. The best electrochemical performance at 850 ℃ belongs to the LSFV 0.1 cell, delivering a maximum power density of 249 mW cm −2 , and the lowest polarization resistance of 0.37 Ω cm 2 ,along with the longest discharging time up to 8.65 h. Compared with the pure LSF, the electrochemical performances of all perovskites doped with vanadium have been greatly promoted, demonstrating that the doping of vanadium can effectively expand the three-phase reaction boundaries of the cell, thus enhance the catalytic activity due to the promotion of oxygen deficiencies and tailing of electronic structures.
研究领域:
能源材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2024
·
IF 1.2
Qitao Chen,Shuaiwu Zhu,Zhifeng Xin,Dongdong Wang,Jiajia Cai,Haijin Li,Shilei Ding
Designing the effective active sites and reaction areas of catalytic materials is important for the development of bifunctional electrocatalysts for zinc-air batteries (ZABs). In this paper, a catalyst with a uniform nanopore structure (noted as NiCo-PS) was one-pot synthesized by using transition metals nickel and cobalt as catalytic active components, sucrose as a carbon source, and triblock copolymers as a soft template. The N 2 absorption and desorption isotherms curves show that the pore size distribution of NiCo-PS modified by surfactant is mainly in 3.6 nm range. NiCo-PS exhibits exceptional bifunctional electrocatalysis due to its effective triple-phase reaction interface from its mesoporous structure, with a positive half-wave potential of 0.758 V for ORR and a low overpotential of 390 mV at 10 mA ⋅ cm − 2 for OER. Furthermore, the rechargeable ZABs with the NiCo-PS catalyst exhibit a high open-circuit voltage of 1.31 V, a significant peak power density of 105 mA ⋅ cm − 2 at 0.56 V, and good stability throughout 270 h testing. This result offers valuable insights for designing catalysts that enhance the active region of the reaction within the cathodes of ZABs and hold significant promise for practical applications.
研究领域:
材料科学
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电化学
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储能
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纳米技术
·
催化
✓ 已验证
DOI
高影响因子
Materials Today Energy
·
2025
·
IF 8.6
Tao Zhang,Ling Meng,Junli Ren,Ning Wang,Lei Du,Xiting Zhang,Lixin Xing,Chunmei Tang,Siyu Ye
As a representative multi-layer energy storage device, zinc-air batteries (ZABs) are inevitably limited by the contact problem between electrode interfaces. Therefore, developing electrode structures with enhanced electron and mass transfer capabilities is crucial for advancing this technology. In this work, Poly(p-phenylene benzobisoxazole)(PBO) carbon paper with in-situ growth Pt catalyst has been prepared and as self-supporting cathode catalyst layer, expanding the traditional three-phase reaction interface to the entire 3D interconnected structure of the air electrode, effectively integrating the catalytic layer with the gas diffusion layer. The modified PBO CO 2 @A-N surface, adorned with uniformly distributed platinum nanoparticles. This modification resulted in exceptional oxygen reduction reaction (ORR) performance, characterized by a substantial electrochemical surface area (200.2 m 2 g Pt −1 ) and an half-wave potential of 0.891 V. In addition, the primary PBO CO 2 @A-N-ZAB demonstrated remarkable peak power densities of 128.1 mW cm −2 in aqueous and 59.1 mW cm −2 in flexible primary zinc-air batteries, underscoring its potential for high-performance energy storage applications.
研究领域:
储能技术
·
纳米科技
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电化学
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材料科学
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）