Journal of Energy Chemistry
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2022
·
IF 13.599
Chaozhong Li,Weiyue Zhao,Xueyi Lu,Zhangsen Chen,Bing Han,Xiaorong Zhang,Jiaxiang Chen,Yijia Shao,Junlang Huo,Yuexiang Zhu,Yonghong Deng,Shuhui Sun,Shijun Liao
Highly active and robust electrocatalysts are desired for proton exchange membrane fuel cells. Pt-based intermetallic compounds (IMCs) have been recognized as one of the most promising low-platinum catalysts for fuel cells (FCs). Herein, we report a high-performance IMCs by anchoring ordered PtCoNi ternary nanoparticles on the N, Co and Ni co-doped dodecahedral mesoporous carbon (DMC). While the introduced Co and Ni participate in the formation of PtCoNi IMCs, some of them are doped in the mesoporous carbon and coordinated by N to form Co-N y /Ni-N z dual active centers, which further enhances the electrocatalytic activity towards oxygen reduction reaction. Moreover, the addition of Ni results in a negative shift of the d-band center of Pt as compared to the Pt/DMC and Pt 3 Co/DMC, making it easier to adsorb oxygen on the surface. As expected, our optimal sample Pt 3 Co 0.7 Ni 0.3 /DMC exhibits excellent performance with mass activity and specific activity of 1.32 A mg −1 Pt and 1.98 mA cm −2 at 0.9 V, which are 7.33 and 6.19 times that of commercial Pt/C, respectively. The Pt 3 Co 0.7 Ni 0.3 /DMC also reveals much better cathodic performance in an H 2 -air single fuel cell than commercial Pt/C catalyst with a power density of 0.802 W cm −2 . This work provides critical sights into constructing efficient catalysts by ternary intermetallic strategy and synergetic effect between active components and support.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Xing Yuan,Lingquan Meng,Chaohe Zheng,Haibo Zhao
Perovskites have been recognized as affordable substitutes for noble-metal catalysts for their tunable catalytic activity and thermal stability. Nevertheless, the highly demanding synthesis procedure still hinders the application of perovskites in catalytic combustion. In this work, a series of nanostructured SiTiO3 perovskites with B-site partial substitution by Co, Fe, Mn, Ni, and Cu are synthesized via flame spray pyrolysis in one step. The comprehensive characterizations on textural properties of nanostructured perovskites reveal that the flame-made perovskite nanoparticles all exhibit high crystal purity and large specific surface area (∼40 m2/g). Furthermore, the highest catalytic activity is achieved by SrTi0.5Co0.5O3 due to the formation of favorable oxygen vacancies, outstanding reducibility, and oxygen desorption capability. Additionally, the presence of 10 vol % water vapor during long-term testing indicates remarkable durability and water resistance. Finally, the CO oxidation and CH4 dehydrogenation on SrTiO3 incorporating Co atoms are more thermodynamically and kinetically favorable than those on other doped surfaces.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Pengcheng Wang,Jun Liu,Peiwen Xu,Xinzhen Feng,Weijie Ji
Three morphologically uniform γ-Al 2 O 3 crystallites [Al 2 O 3 hexagonal plates (Al 2 O 3 -HP), stacked hexagonal plates (Al 2 O 3 -SHP) and rods (Al 2 O 3 -R)] were controllably synthesized. The Co-Mo oxide precursor was loaded on these γ-Al 2 O 3 substrates via aqueous incipient wetness impregnation and transformed to the sulfides under 10% H 2 S/H 2 (v/v) atmosphere. The mainly exposed facet of Al 2 O 3 -HP and Al 2 O 3 -SHP was identified to be the (1 1 0) and (1 0 0)/(1 1 1), respectively; whereas a polycrystalline structure was observed over Al 2 O 3 -R. The original structural feature of oxide precursors, i.e., 2D polymeric/monomeric as well as 3D polymeric/MoO 3 species substantially varied over Al 2 O 3 -HP, Al 2 O 3 -SHP, and Al 2 O 3 -R, which in turn determines the effectiveness in sulfidation of surface oxide precursors. The richness of MoS 2 /Co 9 S 8 /Co-Mo-S species, and less fraction of partially sulphurated CoMoO x S 2 as well as CoO x /SO x 2− entities were recognized over Al 2 O 3 -HP. Based on the areal activity at 250 °C, the sulfides-Al 2 O 3 (1 1 0) interface is approximately 6–13.8 times more active than the poly-crystalline or commercial γ-Al 2 O 3 supported sulfides for water gas shift (WGS) in a hydrogen-rich stream. The sulfides-Al 2 O 3 (1 1 0) interface also notably outperformed the sulfides-Al 2 O 3 (1 0 0)/(1 1 1) interfaces for the reaction.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
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IF 9.5
Longhui Li,Mengyuan Zhou,Ruoyu Xiong,Xuyang Wang,Guancheng Shen,Shuang Sun,Yifu Chen,Tianlun Huang,Huamin Zhou,Yun Zhang
The thermal safety of lithium-ion batteries (LIBs) is a major obstacle to expanding LIBs applications. High-safety separators with a thermal shutdown feature are considered the most promising and appealing thermal protection strategy for LIBs to avoid thermal runaway. Herein, a high-safety poly (ethylene-co-vinyl acetate)/poly (ether ether ketone)/poly (ethylene-co-vinyl acetate) (EVA/PEEK/EVA) composite separator is fabricated by dip-coating and thermally induced phase separation. Once the operating temperature exceeds 80 °C inadvertently (the thermal runaway onset temperature), the EVA layers of the EVA/PEEK/EVA separator are converted into barrier membranes to cut off ion transport and prevent battery reactions. Meanwhile, the PEEK substrate remains dimensionally stable even at temperatures up to 240 °C to avoid the dangers associated with thermal inertia after shutdown. Moreover, compared to the polyolefin separator (commercially available), the EVA/PEEK/EVA separator shows an increase of 42% and 77.1% in ionic conductivity and discharge capacity at the rate of 4C, respectively. Therefore, the EVA/PEEK/EVA separator can secure the LIBs without sacrificing electrochemical performance, and further expand the application of LIBs.
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ENERGY & FUELS
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2023
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IF 5.3
Yuxiang Mao,Jun Cheng,Hao Guo,Lei Qian,Weijuan Yang,Ji-Yeon Park
To improve Co-LDH nanosheet utilization in catalytic conversion of microalgal lipids to biodiesel, an efficient bifunctional catalyst with synergetic acid and base sites was synthesized by in situ growth of Co-LDH nanosheets on HY zeolite. The bifunctional catalyst with a molar ratio of Co-LDH nanosheets to HY zeolite at 4 exhibited synergistic catalysis of acid sites in the HY zeolite and base sites Co(OH)x (x = 2, 3) in the Co-LDH nanosheets, which promoted esterification of free fatty acids and transesterification of triglycerides in microalgal lipids. Co-LDH nanosheets were dispersed on the HY zeolite surface through generated Si–O–Co bonds to enhance Co(OH)x (x = 2, 3) utilization, while the specific surface area of the catalyst increased from 107.9 m2/g (Co-LDH) to 272.5 m2/g. Therefore, the optimal catalyst promoted conversion efficiency from 87.8 to 96.1%, and the conversion efficiency remained at 87.6% after six reusability cycles.
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CHROMATOGRAPHIA
·
2018
·Vol. 82
·期 8
·1285-1293
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IF 1.401
Wang Huimin,Guo Bin,Pang Xiaoya,Yu Huan,Liu Haiyan,Yan Hongyuan,Han Dandan,Guo Huaizhong,Bai Ligai
A poly(NMA-ST- co -TAIC-EDMA) monolithic column was prepared by redox initiation method using N -methylolacrylamide (NMA) and styrene (ST) as co-monomers. The composite monolith was characterized by scanning electron microscopy (SEM) and nitrogen adsorption–desorption isotherm and was used as a solid phase extraction (SPE) absorbent for enrichment of β -sitosterol by high performance liquid chromatography (HPLC). Under the optimum conditions for extraction and determination, the calibration equation was y = 1.02247 x + 0.1766; the linear range was 0.015–0.75 mg mL −1 and the linear regression coefficient was 0.998. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.006 mg mL −1 and 0.02 mg mL −1 , respectively. The spiked recoveries of β -sitosterol in edible oil samples were 83.60–103.88%; precisions for intra-day and inter-day assays presented as relative standard deviations were less than 6.0% and 6.2%, respectively. The enrichment factor of β -sitosterol was 60 and the results showed that the monolithic column had high selectivity and good permeability as an on-line SPE absorbent for the enrichment and determination of β -sitosterol from edible oils.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
W.Q. Yang,Y.X. Hua,Q.B. Zhang,H. Lei,C.Y. Xu
The development of earth-abundant, low-cost, highly active, and durable bifunctional catalysts competent for efficient electrochemical water-splitting is intensively demanding and of vital importance to realize high-purity hydrogen production . Herein, we report that 3D quasi-amorphous pompon-like Co-O and Co-Se hybrid films grown on copper foil (Co-O@Co-Se/Cu) can be electrochemically synthesized from a choline chloride and urea mixed deep eutectic solvent , denoted as Reline, via a facile one-step electrochemical deposition approach. Benefiting from the induction effect of Se, the obtained Co-O@Co-Se/Cu hybrid electrode exhibits strongly enhanced catalytic activity. The optimal Co-O@Co-Se/Cu sample shows good activity and excellent durability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in an alkaline solution with low overpotentials of 85 mV for HER and 340 mV for OER, respectively to reach a catalytic current of 10 mA cm −2 . The Co-Se component within the hybrid films is gradually converted into Co-O species during the course of the OER, which are responsible for the good OER performance. In addition, when performed as bifunctional catalysts in a two-electrode configured electrolyzer, the Co-O@Co-Se/Cu couple displays a water-splitting current of 10 mA cm -2 at 1.65 V with reasonable stability for long-term electrolysis over 100 h. This simple one-step electrochemical synthesis route operated in the Reline-based deep eutectic solvent is demonstrated as an efficient strategy to fabricate active non-noble-free electrocatalysts toward overall water splitting applications.
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高影响因子
TALANTA
·
2018
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IF 4.244
Quan Wang,Shigang Shen
A novel porous monolithic column was synthesized via in situ free-radical polymerization within a stainless steel column (50 × 4.6 mm i.d.) by using triallyl isocyanurate and methyl methacrylate as co-monomers, ethylene glycol dimethacrylate as a crosslinking agent, 1,4-butanediol, 1- dodecanol , and N, N-dimethylformamide as tri-porogens, and azobisisobutyronitrile as an initiator. The optimized monolithic columns were investigated by scanning electron microscopy, a nitrogen absorption-desorption apparatus, and mercury intrusion porosimetry. The effect of mobile phase composition and temperature on chromatographic behavior was studied in detail as well. The results showed that homemade monolithic columns not only have relative uniform porosity structure, low back pressure, and high thermal stability, but also show high column efficiency, the theoretical plates number of the new polymer monolithic column exceeded 31,000 plates m −1 . Good resolution was achieved for HPLC separation of small molecules, including polycyclic aromatic hydrocarbons , isomers of phenols, and the Chinese herbal medicine notoginseng. Methodological validation of six drugs in notoginseng show that correlation coefficients of the linear regressions were in the range of 0.9989–0.9997; the value of relative standard deviation for precision were in the range of 1.37–4.21% for intra-day and 0.34–5.31% for inter-day, respectively; the values of accuracy expressed by recovery were in the range of 100.57–102.51%, 95.18–102.68%, 101.61–102.82%, 100.94–102.40%, 100.99–103.15% and 99.49–103.91% for the six drugs in order, respectively. Taking aromatic hydrocarbons as samples, the relative standard deviation values of the run-to-run (n = 5) and column-to-column (n = 5) based on peak area were < 2.01% and 2.39%, and two RSDs based on retention time were < 2.56% and 2.23%, respectively. The result showed that the polymer monolithic column has good separation ability and high permeability for small molecular substances.
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JOURNAL OF BIOACTIVE AND COMPATIBLE POLYMERS
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2017
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IF 1.31
Fengzhe Wang,Xuan Liu,Longbao Feng,Qiyu Zhu,Shina Yan,Rui Guo
The development of nanomedicine has provided advanced treatment opportunities for many diseases. Simvastatin, a widely used anti-lipidaemic drug, has potential for the treatment of orthopaedic diseases. However, the clinical application of simvastatin is limited because of its hydrophobicity and lack of distribution in osseous tissue. In this study, an amphiphilic nanoparticle, poly(d,l-lactide-co-glycolide)–poly(ethyleneglycol)–poly(d,l-lactide-co-glycolide), was synthesised to improve the biocompatibility of simvastatin. The haemocompatibility of the poly(d,l-lactide-co-glycolide)–poly(ethyleneglycol)–poly(d,l-lactide-co-glycolide) copolymer was investigated through its aggregation, morphology and lysis of human red blood cells, along with its impact on the clotting function according to the activated partial thromboplastin time, prothrombin time and thromboelastographic assays. The results demonstrated that the poly(d,l-lactide-co-glycolide)–poly(ethyleneglycol)–poly(d,l-lactide-co-glycolide) copolymer with a concentration lower than 10 mg/mL had little impact on the aggregation, morphology or lysis of red blood cells, or on blood coagulation. Therefore, the copolymer may be a strong alternative candidate as an effective and safe drug carrier.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Bo Tang,Yuhui Lin,Zipeng Xing,Yaqiang Duan,Siyu Pan,Ying Dai,Jia Yu,Jinlong Zou
The problems of poor electrocatalytic activity and CO tolerance and high Pt-loading of the Pt-based catalysts are still needed to be solved for direct methanol fuel cells. In this study, porous MoS 2 /nitrogen-doped carbon (MoS 2 /CN X ) as Pt supports/co-catalyst for methanol oxidation reaction (MOR) is successfully prepared by using waste bagasse as carbon source. Various material characterization techniques and electrochemical tests are performed to investigate the relationship between structural characteristics and MOR activity. The highly porous structure of CN X can provide abundant binding sites for growing well-dispersed MoS 2 with coral-reef structure, which should facilitate the exposure of MoS 2 edge to improve co-catalytic activity of MoS 2 /CN X . Pt/MoS 2 /CN X displays a higher mass activity (1030.2 mA mg pt −1 ) than those of Pt/MoS 2 /C (710.1 mA mg pt −1 ) and commercial Pt/C (405.4 mA mg pt −1 ), owing to that MoS 2 /CN X can afford abundant attachment sites to anchor Pt to enlarge the available electrochemically active area (111.2 m 2 g −1 pt ) for MOR. With the introduction of porous CN X , more active sites on MoS 2 edges are exposed out to dissociate water molecule for eliminating adsorbed CO-species on the active sites of Pt, which is conductive to enhance the durability and CO tolerance of Pt/MoS 2 /CN X . Furthermore, MoS 2 /CN X with high specific surface area (451.38 m 2 g −1 ) can offer sufficient oxygen-containing functional groups to facilitate the oxidation of intermediates (CO-species) on the active Pt sites, which can also promote the accessibility of methanol to the electroactive surface. These results provide a promising strategy for the design of highly active Pt support/co-catalyst to minimize Pt usage.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Neng Chen,Sai Che,Yu Yuan,Hongchen Liu,Na Ta,Guohua Li,Feng Jiang Chen,Guang Ma,Bo Jiang,Ni Wu,Weiqi Yu,Fan Yang,Yongfeng Li
Transition metal phosphide (TMP) emerges as a promising electrocatalyst for overall water splitting (OWS). However, conventional TMP materials require exogenous metal ions to participate in coordination reactions, which usually suffer from active site blocking, pronounced intrinsic impedance, and inevitable catalyst shedding at high current density. Herein, a novel in-situ construction strategy has been developed to grow N -doped carbon (NC) enwrapped Co/CoP nanosheets directly onto Co foam (abbreviated as CoF) through a three-step transformation of Co to Co(OH) 2 to Co-Metal-Organic Framework (Co-MOF) to Co/CoP/NC. In the entire preparation process, Co metal is only provided by the CoF substrate without external metal sources. Such in-situ construction yields tight contact at the interface of the heterogeneous catalyst, leading to much-reduced impedance and boundary vacancy, while the porous nitrogen-doped carbon backbone further endows the catalyst with the exposure of massive active sites, promotes mass transfer, and possesses high electrical conductivity. The Co/CoP/NC/CoF requires overpotentials of only 64 mV/263 mV@10 mA cm −2 and 414 mV/481 mV@400 mA cm −2 for both HER/OER in 1.0 M KOH, respectively. Remarkably, it reveals excellent OWS catalytic activity with a cell voltage of 1.56 V@10 mA cm −2 and 1.88 V@200 mA cm −2 . This strategy of in-situ interface engineering transformation provides new ideas for direct device processing and construction of highly-efficient transition-metal-based OWS electrode materials.
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高影响因子
Biology-Basel
·
2025
·Vol. 14
·期 11
·1498
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IF 3.5
Senyue Liu,Yang Feng,Zhipeng Huang,Chengyan Mou,Qiang Li,Yongqiang Deng
Simple SummaryIn 2024 summer, the endangered Yangtze sturgeon in China suffered large-scale deaths, which was an urgent problem to solve. This study aimed to identify the cause of the disease and provide a basis for protecting the Yangtze sturgeon and preventing such diseases. The findings revealed that the bacterial co-infection (Streptococcus iniae, Klebsiella pneumoniae, Edwardsiella tarda, and Bacillus cereus) triggered by high temperature and high humidity environmental stress was closely related to this large-scale death event. And these bacteria all exhibited resistance to commonly used antibiotics in aquaculture. This was the first time multiple bacterial co-infection was found in Yangtze sturgeon, so protection should shift from focusing on a single bacterium to multiple ones, and ecological prevention measures are needed. These findings help protect this rare species, guide disease prevention in aquaculture, and safeguard aquatic ecological security.The Yangtze sturgeon (Acipenser dabryanus) is designated as critically endangered in the IUCN Red List and is a first-class protected species in China. During the summer of 2024, it suffered lethal disease outbreaks. Comprehensive pathological and microbiological analyses were conducted to clarify the etiology. Clinically, infected sturgeon exhibited systemic manifestations including cutaneous ulcers, hemorrhagic septicemia, and diffuse necrosis in liver, kidney and heart tissues. Histopathologically, infected sturgeon showed liver hepatocyte vacuolation/necrosis, renal glomerular atrophy, and cardiac epicardial thickening with lymphocyte/eosinophil infiltration; Gram staining revealed co-localized Gram-positive/negative bacteria in lesions, and TEM identified diverse bacterial morphotypes. Through isolation and molecular identification, four bacterial pathogens were characterized:Streptococcus iniae,Klebsiella pneumoniae,Edwardsiella tarda, andBacillus cereus.Bacterial load detection revealed the presence of these pathogens in lesion tissues. Antimicrobial susceptibility testing indicated multidrug resistance to florfenicol, tetracycline, and ampicillin (commonly used antibiotics in aquaculture), while high sensitivity to ceftazidime, ceftriaxone, and ciprofloxacin was observed. Thus, we infer that sustained high-temperature stress triggered bacterial co-infection is closely related to this large-scale death incident. This is the first evidence of polymicrobial infection in the Yangtze sturgeon, emphasizing the significance of shifting from a single-pathogen perspective to a multi-pathogen framework, and highlighting the urgency of implementing ecological prevention strategies for this species.
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