NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 18
·8739-8751
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IF 3.925
Quansheng Wu,Songhua Zhou,Chengbing Fu,Jiesong Zhang,Bo Chen,Hongyan Pan,Qian Lin
For the mono-metal Pd based catalysts, the O–O bond in O2 and H2O2 is easily dissociated due to the higher energy sites of Pd, which decreases the selectivity and productivity of H2O2. To address this issue, non-noble metals M (M = Sn, Fe, Co, Ni) were doped into palladium precursors to create a series of yolk–shell structure bimetallic catalysts Pd–M@HCS (H = hollow; C = carbon; S = sphere) with Pd–M as the core and porous carbon as the shell. The results indicated that the catalyst Pd–M@HCS doped with Sn, Fe, Co, and Ni has a weak dissociation ability for O2, and both the adsorption and dissociation ability for H2 are improved. Of these catalysts, the catalyst Pd–Sn@HCS gives the best performance, which is benefited by the suitable Pd–Sn nanoparticle size and the best Pd2+/Pd0 ratio. The influence of the nPd/nSn ratio in the Pd–Sn@HCS system on catalyst performance was further explored, and the findings revealed that Pd–Sn@HCS had the best catalytic activity and stability when the nPd/nSn ratio was 2. The catalyst's H2 conversion, H2O2 selectivity, and productivity were 35%, 97%, and 3961 mmol gPd−1 h−1, respectively. After 10 cycles, the H2O2 productivity of this catalyst remained at 92.1%, which was greater than the H2O2 productivity of the typical Pd-based catalyst Pd/C, which stayed at 37% under the same conditions.
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Shifu Wang,Zuoyi Xiao,Shangru Zhai,Guoxiang Wang,Wensha Niu,Longfei Qin,Zhongcheng Li,Qingda An
Efficient pseudocapacitive energy storage devices have attracted considerable attention due to the growing demand of electrical power supply. Still, the design and fabrication of electrode materials with high power and energy densities is challengeable. Herein, an in-situ reduction and competitive cross-linking strategy is presented to construct a novel Sn–Mo bimetallic oxide nanoparticle-grown on P-doped hierarchical porous carbon (SnMo–O@P-HPC). The attractive electrochemical performance of SnMo–O@P-HPC composite with an ultrahigh specific capacitance of 2121.3 F g −1 and excellent cycle stability of 92.5% over 5000 cycles is resulted from unique active component, abundant active sites, and well-organized 3D porous structure. An asymmetric supercapacitor composed of activated carbon and SnMo–O@P-HPC displays an amazing specific energy density of 114.9 W h kg −1 at 515.5 and 98.8 W h kg −1 even at 20,900 W kg −1 . Importantly, it also displays a wonderful stability with excellent capacitance retention of 92.5% after 5000 cycles. The work will provide an effective and novel method to obtain the promising electrode materials for supercapacitors .
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高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Pingxiu Zeng,Feng Guo,Yuanchao Wang,Hongmei Hu,Jinhua Liu,Heyong Cheng
Cadmium, tin, mercury, and lead are four widespread metals in our environment from natural sources and human activities, and their toxic, metabolic, and bioavailable properties are chemical form-dependent. Considering large sample capacity in food, environmental and related fields, efficient, sensitive, inexpensive, and green methodologies are preferred for quantifying cadmium, tin, mercury, and lead compounds in an analytical trial. Herein we proposed a tetra-elemental method for simultaneous measurement of Cd, Sn, Hg, and Pb compounds by interfacing high-performance liquid chromatography with inductively coupled plasma mass spectrometry. The tetra-elemental method measured 12 metal compounds within 24 min in satisfactory precisions (<4.3 %) and low detection limits (0.022, 0.011–0.15, 0.016–0.028, and 0.013–0.021 μg L −1 for Cd(II), five tin compounds, three mercury compounds, and three lead compounds, respectively). By applying the proposed tetra-elemental speciation method to shrimp and fish, we found Cd(II) (0.043 mg kg −1 ) presented only in shrimp and methylmercury (0.8–4.6 μg kg −1 ) in both shrimp and fish with the absence of all targeted Sn and Pb compounds, which were far below the maximum limits by China GB 2762-2022. Overall, the proposed method offered significant advantages in analytical, economic and environmental aspects with good applicability to a wide range of food, environmental, and biological samples.
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高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Jiaxin Wang,Xuening Lu,Jiaen Zhang,Zeheng Xiao
Lipids such as phosphatidylcholine (PC), 3- sn -phosphatidylethanolamine (PE), sphingomyelin (SM) and L-α-lysophosphatidylcholine (LPC) are the major components of biological membranes and play important roles in physiological functions. Here, PC, PE, SM, and LPC were extracted from golden apple snails (GAS, Pomacea canaliculata ) and GAS flesh (GASF) using an ethanol/hexane sequential scheme and quantified simultaneously using ultra-high performance liquid chromatography-electrospray ionization-tandem mass spectrometry (UHPLC-ESI-MS/MS) to evaluate whether the GAS could be the source of the four lipids. Our results suggest that ethanol extracts contained the most crude lipids, and the yield of dry (evaporated) lipids were 3.45 g per 100 g fresh GASF and 1.82 g per 100 g of fresh GAS. Quantification of the lipids using UHPLC-ESI-MS/MS suggested that GAS contained PE, PC, SM and LPC, with SM being the most abundant lipid (after purification: 1.71 and 1.42 mg g −1 dry weight from 100 g of GASF and GAS, respectively). The method we used is cost-effective, and the recovery rates of ethanol and hexane ranged from 80−91% and 87−91% respectively. Overall, GAS and GASF are potential raw materials for lipids such as SM and PC extraction using the ethanol/hexane method. Comparatively, lipids extraction from the GAS is more effective and timesaving. Our finding would provide a way to utilize GAS and potentially control its invasion.
研究领域:
生物化学
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分析化学
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入侵生物学
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高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 45
·19122-19130
·
IF 0
Wei Ni,Jianli Cheng,Lingying Shi,Xiaodong Li,Bin Wang,Qun Guan,Ling Huang,Guifang Gu,Hang Li
A novel style of Sn/C yolk–shell nanospheres integrated into nanofibrous 3D electric conducting structures as free-standing materials for potential applications such as new-generation anode structures for gel-type lithium-ion batteries via the design principle of inhibiting the aggregation of tin nanoparticles, buffering the occurring volume strain, and the flexible conductive networks.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Minhui Liao,Yang Zhou,Xunchang Jiang,Renjie Wan
High safety, high ion conductivity, and stable interface contacts are of significant importance for the application of solid-state electrolytes (SSEs) in solid-state lithium metal batteries (SSLMBs). In this study, SSEs with high ion conductivity and safety were constructed by in-situ polymerization of poly butyl acrylate (PBA) based electrolytes in the three-dimensional (3D) pores of a polyvinylidene fluoride (PVDF) nanofiber membrane, and embedded with ion conductor succinonitrile (SN), fluorinated ethylene carbonate (FEC), and imidazolium-based ionic liquid (IL). The test results and microscopic structural analysis indicate that SN is uniformly dispersed in PVDF, effectively reducing the crystallinity of solid polymer electrolytes (SPEs) and constructing a 3D interconnected lithium-ion conduction network. Consequently, an ion conductivity of 4.89 mS cm −1 was achieved at 25°C. Meanwhile, density functional theory (DFT) calculations demonstrated that imidazolium-based ionic liquid can adjust the dissolution characteristics of Li + through weak interactions with the polymer framework and strong coordination with TFSI - . X-ray photoelectron spectroscopy (XPS) characterization revealed that the imidazolium-based ionic liquid can form a stable solid electrolyte interface enriched with Li 3 N on the lithium-metal surface. The resulting SPEs demonstrated excellent ion conductivity, a high Li + transfer number (t Li + = 0.739), and a nanofiber-reinforced interpenetrating framework with a tensile strength of 17.15 MPa. Furthermore, the LiFePO 4 (LFP)||Li battery equipped with PBA-PVDF-SN (modified with IL) exhibited excellent electrochemical performance at room temperature with a capacity retention of 87.4 % after 800 cycles at 0.5C.
研究领域:
材料科学
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电化学
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电池技术
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聚合物化学
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 4
·1966-1977
·
IF 14.511
Zhiheng Ren,Jixiao Li,Minghui Cai,Ruonan Yin,Jianneng Liang,Qianling Zhang,Chuanxin He,Xiantao Jiang,Xiangzhong Ren
Polymer electrolytes (PEs) synthesized from an in situ polymerization strategy are considered as promising candidates to improve interfacial compatibility. However, most in situ formed PEs still suffer from problems such as low lithium-ion transference number (tLi+) and insufficient ionic conductivity at room temperature (RT). Herein, a series of copolymer electrolytes (CPEs) consisting of 1,3-dioxolane (DOL) and 1,3,5-trioxane (TXE) monomers are synthesized. Due to the additive of succinonitrile (SN), and the promoted dissociation of lithium salt, the obtained polymer electrolyte (SN-CPE) exhibits an excellent ionic conductivity (4.06 × 10−4 S cm−1) and a high lithium-ion transference number (tLi+ = 0.881) at RT, as well as a high voltage oxidation window of 5.1 V. Thanks to the in situ formed intimate contacted electrode/electrolyte interface, the symmetric Li/Li cell can achieve long-term cycling stability over 1500 h without a short circuit. A LiF-rich organic–inorganic composite layer is formed on both the solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI) as demonstrated by XPS, TEM, and SEM analyses. Thereafter, the LiFePO4/Li cell has a high capacity retention of 84.1% after 900 cycles at RT, and it can still work effectively at high temperatures (e.g. 80 °C). Furthermore, SN-CPE exhibits excellent electrochemical performance and safety in the LiCoO2/Li cell and LiFePO4/graphite pouch cell, which again supports the promising application of SN-CPE.
研究领域:
材料科学
·
电化学
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能源存储
·
电池技术
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高影响因子
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