APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Hongbo Yu,Shuibo Wang,Lin Zhu,Chunzheng Wu
Pt nanocatalysts exhibits superior activity towards the hydrogenation reaction of halonitrobenzenes (HNBs), but the selectivity to the valuable product haloanilines (HANs) is always poor due to the unavoidable dehalogenation process. In this study, we find that coating a thin Sn layer on Pt nanoparticles (NPs) could improve not only the hydrogenation activity but also the selectivity to HANs. These core–shell structured Pt@Sn NPs with different Sn shell thickness were synthesized by one-pot reduction, and their catalytic performance in the hydrogenation reaction of p -chloronitrobenzene to p -chloroaniline could be effectively regulated by the Pt/Sn ratio. The catalyst with a Pt/Sn ratio of 5/1 achieved the highest p -chloronitrobenzene conversion (96.5 %) and excellent selectivity to p -chloroaniline (97.9 %). The kinetic study and H 2 -TPD analysis indicated that the Sn species on Pt could facilitate the adsorption of p -chloronitrobenzene and the dissociation of H 2 . The designed Pt@Sn core–shell nanocatalysts are applicable to a wide range of hydrogenation reactions.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Wen Xu,Xiaoshu Wang,Weilong Hou,Kang Tang,Xinqing Lu,Yijing Gao,Rui Ma,Yanghe Fu,Weidong Zhu
Although the titanosilicate zeolite catalyzed one-pot oxidative hydration of ethylene with hydrogen peroxide (H 2 O 2 ) to ethylene glycol (EG) takes advantages of step-saving and facile operation, both H 2 O 2 utilization efficiency and EG yield are relatively low. In the present work, Sn-doped Ti-MWW zeolites, named Sn-Ti-MWW, were developed for this oxidative hydration, showing the much higher H 2 O 2 utilization efficiency and EG yield, compared to Ti-MWW. The extensive characterizations of Sn-Ti-MWW zeolites, in combination with Density Functional Theory (DFT) calculations, verify that the doping of Sn into Ti-MWW leads to the higher electropositivity of the Ti species, resulting in the stronger acidity of the zeolite, which is helpful to the H 2 O 2 utilization and EG production. In addition, although the catalyst deactivation is observed due to the deposition of the bulky byproducts onto the active sites and/or into the zeolite micropores, the simple calcination of the used catalyst readily restores its catalytic activity. Therefore, it is anticipated that the developed Sn-Ti-MWW catalyst might be applicable in the one-pot oxidative hydration of ethylene with H 2 O 2 to EG industrially.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2023
·
IF 11.2
Shuang Liu,Limin Ma,Cheng Zhen,Dan Li,Yishu Wang,Qiang Jia,Fu Guo
Bismuth telluride-based thermoelectric (TE) devices were widely used in waste heat recovery due to their high thermoelectric figure of merit (ZT), but the severe diffusion between Sn-based solder and TE pillar generated porous and brittle Sn-Te intermetallic compound (IMC), which seriously restricted the reliable service of devices. Ni-based coating was used but the thick Ni-Te IMC also impaired the properties of TE pillars. In this work, the crystalline Co-P coating was inserted between the p-type TE material Bi 0.5 Sb 1.5 Te 3 and the solder by electrodeposition, and the power generation sustainability of the TE pillar were significantly improved, and the mechanism was revealed. The microstructural characterization proved that the Co-P coating could effectively resist the diffusion of active Sn, Bi, Sb, Cu atoms. Co-P coating would provide support for the structural integrity and performance sustainability of TE pillars. It was worth noting that an ultrathin CoTe 2 IMC layer was formed between the Co-P coating and the Bi-Sb-Te pillar, which was much thinner than the Ni-Te IMC layer reported in the literature. This indicated that Co-P only consumed little thermoelectric elements, but also a good metallurgical bond was formed between the Co-P and the Bi-Sb-Te. After aging at 423 K for 150 h, the maximum output power and average Seebeck coefficient of the TE pillar without coating dropped significantly by 74% and 34%, respectively, and the internal resistance rose by 67%. Remarkably, the maximum output power and average Seebeck coefficient of the TE pillar protected by the Co-P coating only decreased by 14% and 5%, respectively, and the internal resistance only increased by 6%.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Xiaoning Wang,Xiaochun Gao,Li Tang,Puhua Sun,Ying Liu,Shaoqi Hou,Yanfu Tong,Xitao Yin,Xiaoguang Ma
The challenges encountered by Pt-based electrocatalysts in alkaline hydrogen oxidation reaction include high Pt dosage and conflicting demands for modulating adsorption strengths among diverse intermediates. Here, an ultrasmall Pt cluster grafted on antimony tin oxide nanocrystalline with strong electron donor ability to minimal Pt dosage yet maximized electrocatalytic performance is developed. Mechanism studies show that the formation of Pt–Sn/Sb interaction at the heterointerface and the resultant reversed electron transfer selectively enhance the adsorption for OH - while concurrently weakening the binding strength for *H and CO toward Pt clusters. This accelerates the kinetics of H 2 /CO oxidation by promoting the binding of OH species with *H/*CO, yielding the catalyst with up to 5.7-fold higher mass-specific activity than benchmark Pt/C and increased resistance to CO poisoning. This work demonstrates the rational design of the synergistic multi-site interactions towards advanced Pt-based catalysts.
研究领域:
材料科学
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电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
BIOCATALYSIS AND BIOTRANSFORMATION
·
2016
·
IF 0.892
Wei Wei,Danping Qi,Mingming Diao,Lu Zhaoxin,Fengxia Lv,Haizhen Zhao
In this study, the synthesis of 3-O-β-D-galactopyranosyl-sn-glycerol (GG) was performed by the reverse hydrolysis of D-galactose and glycerol using β-galactosidase from Kluyveromyces lactis. Four process variables, reaction temperature (30.0–45.0 °C), reaction time (24–48 h), enzyme concentration (150.00–350.00 U/mL), and substrate molar ratio (glycerol:D-galactose, 7.5:12.5 mmol/mmol) were investigated and optimized via response surface methodology (RSM) for optimal GG synthesis. Both quadratic equations and the optimal reaction conditions were established. Results showed that the four variables, i.e., reaction temperature, reaction time, enzyme concentration, and substrate molar ratio had significant (p < 0.0001) effects on the synthesis of GG. The optimal reaction conditions were identified as 350.00 U/mL of β-galactosidase concentration and 8.65:1.00 of substrate molar concentration ratio (glycerol: D-galactose) at 39.8 °C and 48 h of reaction. Under these conditions, the GG concentration was 140.03 g/L and GG yield was 55.71%, which both were close to the predicted values (143.26 g/L and 56.73%). This finding proves the RSM to be a useful tool in optimizing process conditions for GG synthesis.
研究领域:
生物化学
·
食品科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Lun Zhang,Kuo Wei,Jinming Ma,Jing Wang,Zhiwei Liu,Ruirui Xing,Tifeng Jiao
Constructing bimetallic carbon-based electrocatalysts of rational geometric structures has been an efficient method to improve the kinetics of hydrogen evolution reaction (HER). The reasonably designed bimetallic carbon-based electrocatalysts have low-cost and high electrocatalytic efficiency, which are promising to replace the platinum catalysts. Herein, the Sn/Mo 2 C composite nanoparticles were encapsulated in carbon nanofibers of a 2D structure (Sn/Mo 2 C-CNFs) have been successfully fabricated by a simple electrospinning and carbonization process. As a result, after turned the ratio of Sn and Mo 2 C into 1:3, the Sn/Mo 2 C-CNFs showed a superior HER performance with an overpotential of 144 mV in the current density of 10 mA⋅cm −2 in alkaline medium, the Tafel slope of 49.8 mV⋅dec -1 , and operated stably for 60 h and 5000 circles. These excellent properties were mainly attributed to the special nanofiber structure and the synergism of Sn and Mo 2 C that enhanced the active sites and weakened the binding force of H proton and Mo 2 C. The present work provides an uncomplicated, efficient, and low-cost train of thought for resolving the problem of replacing the Pt-based catalysts with bimetallic materials.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·Vol. 16
·期 7
·9480-9487
·
IF 9.9
Huang Ruling,Xu Ruochen,Zhang Jiangtao,Wang Jiayun,Zhou Tianyi,Liu Mingyi,Wang Xiaolong
Gel polymer electrolytes (GPEs) have attracted extensive attention in lithium-ion batteries due to their high security and excellent electrochemical performance. However, their inferior Li-ion transference number, low room-temperature ionic conductivity, and poor long cycle stability raise challenges in practical applications. Herein, a flexible poly(vinylidene fluoride-co-hexafluoropropylene)-butanedinitrile (PVDF-HFP-SN)-based GPE (PSGPE) is synthesized successfully by a general immersion precipitation method. The resultant PSGPEs have numerous connecting pores to ensure sufficient space for liquid electrolytes. Moreover, the reduced crystallinity of PVDF-HFP and the high polarity of SN can reduce the energy barrier of Li-ions shuttling between pores. The synergistic effect possesses a high ionic conductivity of 1.35 mS·cm −1 at room temperature with a high Li-ion transference number of 0.69. The PVDF-HFP-SN-based GPE is applied in a LiFePO 4 /graphite battery, which can realize stable cycling performance for 350 cycles and good rate performance at room temperature. These results demonstrate that the novel PSGPE possesses advantage in simplified production process, which can improve the practicability of gel polymer lithium-ion batteries.
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
JOURNAL OF THE ENERGY INSTITUTE
·
2021
·
IF 6.186
Wenbin Li,Jida Wang,Zhen Wang,Jie Chen,Xiaoan Nie,Zhangshuai Ding,Dechao Wang,Zhifeng Zheng,Yunwu Zheng,Jianchun Jiang
Pt–Sn–Ce/γ-Al 2 O 3 catalysts were synthesized by the impregnation method and used to produce aromatic hydrocarbons (AHs)-rich bio-oil via catalytic fast pyrolysis of cellulose . The upgraded products were on-line analyzed by pyrolysis-comprehensive two-dimensional gas chromatography/mass spectrometry (Py-GC × GC/MS). It was found that Pt–Sn–Ce/γ-Al 2 O 3 catalysts were effective for improving the relative content of AHs in bio-oil. Especially, Pt–Sn–Ce/γ-Al 2 O 3 contributed the highest AHs content (85.82%), which was 3 times than that of γ-Al 2 O 3 , and increased 85.44% compared with non-catalytic. In addition, Pt–Sn–Ce/γ-Al 2 O 3 and Pt–Sn/γ-Al 2 O 3 can generate the highest monocyclic aromatic hydrocarbons (MAHs) with the relative content of 60.24% and 51.92%, respectively. Pt–Sn–Ce/γ-Al 2 O 3 catalyst can be reused five times with stable catalytic activity to produce AHs-rich bio-oil.
研究领域:
能源化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Qiulian Li,Shizhong Sun,Xinyu Li,Xiang Li,Xiu Liu,Daoyong Zhang,Na Yu,Shurong Wang
Kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) is emerging as one of the most promising materials owing to its low-cost, non-toxicity, similar electronic properties with Cu 2 (In,Ga)Se 2 (CIGS). However, the current highest power conversion efficiency (PCE) for CZTSSe device is far below the CIGS because of the high open-circuit voltage (V oc ) deficit and low fill factor (FF). Here, we fabricated CZTSSe thin film from 2-methoxyethanol solutions and investigated the effects of different Sn (Sn 2+ vs Sn 4+ ) oxidation states of precursor solution and selenization temperature on the crystal quality of the CZTSSe thin film and device performances. By characterizations and analyses, we found that incomplete redox reaction caused by the off-stoichiometric component in Sn 2+ precursor solution led to the formation of detrimental secondary phases such as SnSe, Cu 2 Se, and SnSe 2 in the CZTSSe thin film. The existence of volatile SnSe could cause the formation of voids and thus affected the FF and V oc . The reaction from Sn 4+ precursor solution to absorber material avoided the formation of SnSe. Ultimately, the Sn 4+ thin film showed better features in terms of improving crystal quality and reducing V oc deficit that limited the efficiency of kesterite CZTSSe thin film solar cells. Besides, we demonstrated that an appropriate selenization temperature could further reduce the number of secondary phases and improve the surface morphology and crystallinity of the CZTSSe thin film. As a result, we obtained CZTSSe thin film solar cells with 8.27% PCE from the Sn 4+ precursor solution under the selenization temperature of 580 °C.
研究领域:
材料科学
·
太阳能电池研究
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Tianqi Hu,Hongtao Chen,Mingyu Li
This paper presents a novel die attach material that withstands high working temperatures of up to 676 °C after < 40 min of reflow at 250 °C. The die attach material was preform compressed with Cu@Sn core-shell structured microparticles . When the reflow temperature reached 232 °C, the outer Sn layer melted and connected the inner Cu cores. After reflow soldering at 250 °C for 8 min, the outer Sn completely transformed into network-like Cu-Sn intermetallic compounds (IMCs), which have a higher remelting temperature than Sn (415 °C for Cu 6 Sn 5 and 676 °C for Cu 3 Sn). Consequently, the inner Cu cores were interconnected by the formed network-like Cu-Sn IMCs with a high remelting temperature of at least 415 °C. If the sample was reflowed at 250 °C for 40 min, the outer Cu 6 Sn 5 layer completely transformed into Cu 3 Sn, and the resulting bondline could sustain a higher temperature. The shear strengths of the resulting bondlines after reflow soldering at 250 °C for 8 and 40 min were 29.35 and 18.78 MPa at 400 and 500 °C, respectively.
研究领域:
材料科学
·
电子工程
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Yiping Tang,Chaoqi Bi,Duo Zhang,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Qingliu Wu
To overcome the shortcomings of poor conductivity and large volume change, we proposed a novel three-dimensional ordered macroporous Cu/Sn (3DOM Cu/Sn) composite material as the anode of lithium-ion batteries (LIB). Electron microscopies and X-ray diffraction revealed that this new 3DOM Cu/Sn composite has the surface of the 3DOM Cu framework covered with a uniform layer of Sn nanoparticles . As a binder-free anode of LIB without conductive additives, this 3DOM Cu/Sn composite demonstrated an extremely high rate capability of about 707 mAh/g at 5C, which is 4 times higher than that of bare Cu/Sn anode, and excellent durability of 851 mAh/g up to 250 cycles. The post-test analysis showed that extraordinarily electrochemical performances of this composite anode are ascribed to the unique 3DOM microstructure.
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Chen Liu,Jin Hu,Haichang Zhang,Jiaxin Wu,Chunsheng Shi,Biao Chen,Chunnian He,Naiqin Zhao
Poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) demonstrate strong electrode adhesion and facile processability, making them promising candidates in all-solid-state lithium metal batteries (ASSLMBs). However, poor ionic conductivity, low Li+ transference number, and insufficient mechanical strength greatly limit their practical application. Zeolite, a porous ceramic material rich in active sites, shows significant potential as a filler in the PEO-based SPEs. In this study, we prepared heteroatomic Sn-Beta zeolite with high Lewis acid activity through a simple two-step postsynthesis process and explored the mechanism of action of metal acidic sites on Li+ dissociation and transport. The Lewis acidic metal sites in the Sn-Beta zeolite effectively weaken the coordination environment of Li+ by binding the O atoms in PEO via metal–oxygen bonds, facilitating the transfer of Li+ along the PEO polymer chains. Moreover, it can promote the dissociation of the lithium salt by anchoring TFSI– anions, resulting in the release of free Li+. The obtained SPE (PL-Sn-Beta) exhibits a high ionic conductivity of 1.40 × 10–3 S cm–1 at 60 °C and a Li+ transference number of up to 0.51. Furthermore, the ordered pore channels of the Sn-Beta zeolite provide uniform Li-ion transport pathways, facilitating homogeneous Li+ deposition. As a result, the lithium symmetric cell with PL-Sn-Beta demonstrates a stable lithium plating/stripping cycle performance for over 2200 h at 60 °C and 0.1 mA cm–2. Meanwhile, the initial discharge capacity of the Li/PL-Sn-Beta/LiFePO4 full cell reaches 145.6 mAh g–1 at 1 C and 60 °C, and the capacity retention rate is 81.5% after 500 cycles. This work provides theoretical insights into the mechanism of zeolite fillers in SPEs as well as new design concepts.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）