CHEMICAL PAPERS
·
2023
·Vol. 77
·期 11
·6637-6646
·
IF 2.2
Chen Lei,Li Rongxin,Li Yuanlong,Shu Qijiang,Yang Tao
The reduced graphene oxide aerogel modified by 4-chlorophenyl sulfoxide was obtained by a simple self-assemble process under the basic reduction-oxide condition, then freeze-dried for future using. The prepared aerogel was shortly named 4CS-rGO, which was characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscope, et al. 1 mg of 4CS-rGO composite was used as an adsorbent to adsorb Pd(II) and Pt(IV) in 1.0 mL 40 mM Britton-Robinson buffer solution with various pH. The adsorption efficiency of Pd(II) increased with the increase in pH, whereas the hydrolysis of Pd(II) happened at pH 13, and the maximum adsorption efficiency of Pd(II) was 91.82% at pH 12, which was mainly driven by electrostatic attraction. Besides, the adsorption behavior of the 4CS-rGO composite for Pt(IV) was explored to evaluate the possibility to isolate Pd(II) and Pt(IV) ions by using aerogel. We found that, quite interestingly, hydrogen bond, hydrophobic interaction and van der Waals force can strongly conquer electrostatic repulsion driven Pt(IV) ions adsorption behavior at pH 5, and Pt(IV) ions displaced by cationic surfactant. Moreover, a tighter Pt(IV) ions adsorption behavior than Pd(II) ions was observed while we adsorb them respectively with/without 4-chlorophenyl sulfoxide modified the graphene, while branched TBAB was easier and more effectively replaced the adsorbed Pt(IV) ions than strained CTAB.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
ZhiZhong Xie,Guanghui Chen,Zhien Liu,Xinxin Zhu,Dan Liu,Rong Li,Deyu Qu,Junsheng Li
Serious shuttle effect and sluggish reaction kinetics are the two major barriers that limit the cathode cycling stability in lithium-sulfur batteries. In this study, we deviate from the prevalent approach compositing sulfur with various carbonaceous materials by introducing electrocatalysis concept in lithium-sulfur chemistries. Two-dimensional graphene has been used as model system to support electrocatalyst Pt. Uniform dispersion of Pt nanoparticles on graphene layers not only demonstrate to preferential adsorption of soluble polysulfide species, but also catalyze efficiently transformation to long-chain polysulfides in the subsequent redox process. The result rGO-Pt/S composite shows a 29.5% enhancement in capacity over pristine rGO/S electrode. More impressively, rGO-Pt/S electrode exhibits good cycling stability at a high rate of 2 C corresponding to a tiny capacity fading rate of 0.01% per cycle over 300 discharge/charge cycles. Thus, this work provides a facile strategy for improving the performance of Li-S batteries toward practical application.
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BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Limin Yang,Heng Guo,Ting Hou,Jingang Zhang,Feng Li
Breast cancer (BC) is the most common cancer in the world and circulating tumor cells (CTCs) are reliable biomarkers for early breast cancer diagnosis in a non-invasive manner. However, effective isolation and sensitive detection of BC-CTCs by portable devices in human blood samples are extremely challenging. Herein, we proposed a highly sensitive and portable photothermal cytosensor for direct capture and quantification of BC-CTCs. To achieve efficient isolation of BC-CTCs, aptamer functionalized Fe 3 O 4 @PDA nanoprobe was facilely prepared through Ca 2+ -mediated DNA adsorption. To further detect the captured BC-CTCs with high sensitivity, multifunctional two-dimensional Ti 3 C 2 @ [email protected] nanozyme was synthesized, which not only possessed superior photothermal effect but also exhibited high peroxidase-like activity for catalyzing 3,3′,5,5′-tetramethylbenzidine (TMB) to produce TMB oxide (oxTMB) with a strong photothermal characteristic, combining with Ti 3 C 2 @ [email protected] to synergistically amplify the temperature signal. Moreover, numerous Ti 3 C 2 @ [email protected] nanocomposites would be selectively attained on the BC-CTCs surface through multi-aptamer recognition and binding strategy, which further enhanced the specificity and facilitated signal amplification . Therefore, direct separation and highly sensitive detection of BC-CTCs was successfully achieved in human blood samples. More significantly, the controlled release of the captured BC-CTCs without affecting cell viability could be straightforwardly realized by a simple strand displacement reaction. Thus, with the distinct features of portability, high sensitivity, and easy operation, the current method holds great promise for early diagnosis of breast cancer.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Zhuo Guo,Tianshuai Sun,Yahui Li,Hailan Kang,Yuhan Che,Yan Zhang,Jinlin Lu
In this work, mesoporous WS 2 with high surface area was prepared by hard template method . First, a one-step nanocasting generates metal precursor@mesoporous silica SBA-15 composites. A hydrothermal method is subsequently adopted to convert the precursors to sulfides in the confined nanochannels . After etching silica SBA-15, mesoporous layered metal sulfide crystals were obtained as the products. Then, we have put forward a new catalyst based on mesoporous WS 2, RGO nanosheets and Pt nanoparticles as a highly efficient electrocatalyst for hydrogen evolution . The Pt/WG-2 nanostructure electrocatalyst in this report exhibits excellent performance with a small Tafel slope of 47 mV dec −1 , long-term durability and an overpotential of 95 mV in 0.5 M H 2 SO 4 for the hydrogen evolution reaction (HER).
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Fen-Ying Kong,Rong-Fang Li,Lei Yao,Zhong-Xia Wang,Wei-Xin Lv,Wei Wang
This study described the synthesis, characterization and application of novel Pt nanoparticles supported on nitrogen doped reduced graphene oxide-single wall carbon nanotubes (Pt-N-rGO-SWCNTs) nanocomposite as a sensitive sensing interface for electrochemical determination of piroxicam (PXM). The Pt-N-rGO-SWCNTs nanocomposite was synthesized by a simple one-pot wet-chemical strategy employing ammonium carbonate as N source and reducing agent. The structure and morphology of Pt-N-rGO-SWCNTs nanocomposite were extensively studied by various characterization techniques. Benefiting from their unique structural and functional properties of different components and synergistic effect, the resulting Pt-N-rGO-SWCNTs nanocomposite showed excellent sensing performance toward the oxidation of PXM. The corresponding calibration curve for the current responses using differential pulse voltammetry method (DPV) showed a wide linear range of 0.02 to 20 μg mL −1 with a lower detection limit of 5 ng mL −1 . Also, the as-prepared sensor showed outstanding stability, reproducibility and anti-interference capability for the determination of PXM.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xingye Chen,Meng Ge,Yanyong Li,Yatian Liu,Jiameng Wang,Lihong Zhang
A series of novel γ -Al 2 O 3 supported Pt In bimetallic catalysts were prepared by perovskite (PTO) lattice interstitial confined reduction and compared with industrial catalyst PtIn/ γ -Al 2 O 3 in the propane dehydrogenation to propene . The physics-chemistry properties of all catalysts and precursors were characterized by BET, NH 3 -TPD, TPR, XRD , TEM , STEM-EDS, XPS , TG and O 2 -TPO techniques. The results show that the metal ions of Pt 4+ and In 3+ confined in PTO lattice interstitial sites were more easily reduced than those confined in PTO lattice. The lattice interstitial confinement was beneficial for the formation of small and highly dispersed Pt In bimetallic species on the surface of γ -Al 2 O 3 supported PTO Nano islands. It is just the confinement of PTO lattice interstitial sites for appropriate In 3+ /In 0 ratio and weak Pt In interaction and the sharing Al O bond for anchoring PTO nanoparticles and weakening the surface acid sites result in the high activity and superior stability of PtIn/LaAlO 3 / γ -Al 2 O 3 in propane dehydrogenation. The initial propane conversion of PtIn/LaAlO 3 / γ -Al 2 O 3 was 47%, and can be maintained at 25% after 16 h, while its propene selectivity only decreased from 96% to 90%.
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ELECTROCHIMICA ACTA
·
2018
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IF 5.116
Yufei Li,Libo Shi,Xuan Cai,Hongli Zhao,Xiangheng Niu,Minbo Lan
Quantification of superoxide anions (O 2 − ) is of great significance for the pathological research of many diseases. In this work, a non-enzymatic electrochemical sensor for superoxide sensing was fabricated on the basis of metal-organic frameworks (MOFs)-derived porous carbon matrix loaded with Pt and Co nanoparticles (denoted as Pt-Co-PC). Zeolitic imidazolate framework-67 (ZIF-67) was utilized as the precursor through a one-step calcination under N 2 atmosphere to prepare cobalt nanoparticles-porous carbon composites (denoted as Co-PC). Pt-Co-PC was then obtained by using a facile galvanic replacement procedure with Co-PC and chloroplatinic acid solution. Furthermore, the home-made screen printed gold electrodes (SPGEs) were used to immobilize the as-synthesized materials, constructing Pt-Co-PC modified electrochemical sensors. The recommended Pt-Co-PC/SPGE sensors exhibit excellent electrochemical performance for the detection of O 2 − with an extremely low detection limit of 0.118 μM (S/N = 3) and a high sensitivity of 6.218 × 10 −4 mA μM −1 cm −2 . Meanwhile, the proposed sensors possess superior reproducibility and stability. More importantly, our sensors have successfully captured the electrochemical signals of O 2 − released from Hela cells, which means the fabricated sensors have potential application of monitoring O 2 − in pathological and biological fields.
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Catalysts
·
2019
·Vol. 9
·期 4
·387
·
IF 3.444
Bei Wang,Liu Tao,Yu Cheng,Fang Yang,Yuguang Jin,Chunmei Zhou,Hao Yu,Yanhui Yang
The direct alcohol fuel cell is a kind of power generation device that directly converts the chemical energy of small molecule alcohols into electric energy. In this paper, the electro-oxidation behaviors of some typical alcohols (methanol, ethanol, ethylene glycol, n-propanol, 2-propanol, and glycerol) over Pt, Pd, and Au electrodes were investigated in acidic, neutral, and alkaline media, respectively. By analyzing the activity information from a cyclic voltammetry (CV) method and some dynamic tests, several regularities were revealed in those electro-oxidation behaviors. Firstly, alkaline media is the best for the electro-oxidation of all these alcohols over Pt, Pd, and Au catalysts. Secondly, the hydrogen bond donation abilities (HBD) of different alcohols were found have a great relationship with the catalytic performance. In alkaline media, on Pt electrodes, the solute HBD is positively correlated with the ease of electrooxidation within the scope of this experiment. Contrarily, it is negatively correlated on Pd and Au electrodes. Additionally, for Pt catalysts in acidic and neutral media, the relationship becomes negative again as the HBD increases. Finally, the alcohol’s molecular structure properties were found to have a remarkably influence on the activity of different catalysts. Over the Pt electrode in alkaline media, the activation energy of methanol oxidation is 44.1 KJ/mol, and is obviously lower than the oxidation of other alcohols. Under similar conditions, the lowest activation energy was measured in the oxidation of n-propanol (14.4 KJ/mol) over the Pd electrode, and in the oxidation of glycerol (42.2 KJ/mol) over the Au electrode. Totally, among all these electrodes, Pt electrodes showed the best activities on the oxidation of C1 alcohol, Pd electrodes were more active on the oxidation of C2-3 monobasic alcohols, and Au electrodes were more active on the oxidation of polybasic alcohols.Keywords:DAFCs;electro-oxidation;gold;palladium;platinum
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SEPARATION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.2
Yan Yan,Qi Wang,Zeyang Xiang,Yanzhao Yang
A reasonable project was presented for the extraction and separation of Pt(IV), Pd(II), Ru(III), and Rh(III) from the mixed imidazolium-based ionic liquids (ILs) [C6mim]Cl, [C6mim][NTf2], and [C6mim][DDTC]. Pt(IV) was first separated from other three platinum group metals with a mixture of [C6mim]Cl and [C6mim][NTf2]. Then, separation of Pd(II) and Ru(III) from Rh(III) was realized by changing the concentration of [C6mim][DDTC]. Back-extraction of Pt(IV), Pd(II), and Ru(III) from loaded hydrophobic phase and the recovery of Rh(III) in aqueous phase were also investigated. Mechanisms between Pd(II)/Ru(III) and [C6mim][DDTC] were further explored using ultraviolet spectrophotometry (UV-Vis), infrared spectrophotometry (FTIR), the method of continuous variations, ab initio quantum chemical studies, and X-ray crystallographic analysis. The results afford more directions for extracting and separating metals by introducing devisable functionalized group into ILs.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Yan Li,Junlin He,Jun Chen,Yazhen Niu,Yilin Zhao,Yuchan Zhang,Chao Yu
In this study, a dual-type responsive electrochemical immunosensor was developed for the quantitative detection of proprotein convertase subtilisin/kexin type 9 (PCSK9), a potential biomarker of cardiovascular disease in serum. N-doped graphene nanoribbons (N-GNRs) with good conductivity were used as the sensing matrix modifying the glassy carbon electrode. Palladium platinum alloy (PdPt) nanoparticles with high catalytic performance toward the reduction of hydrogen peroxide (H 2 O 2 ) were reduced onto amino-functionalized fullerene (n-C 60 -PdPt) and significantly amplified the electrochemical signal recorded by the amperometric i-t curve. Furthermore, staphylococcus protein A (SPA) with antibody orientation function was introduced to improve the immunoreaction efficiency. Accordingly, a label-free immunosensor was fabricated based on n-C 60 -PdPt/N-GNRs for the quick detection of PCSK9. Meanwhile, to realize ultrasensitive detection of PCSK9, Pt-poly (methylene blue) (Pt-PMB) nanocomposites synthesized by a one-pot method for the first time were used as a novel signal label, which exhibited uniform morphology as well as good conductivity and produced an electrochemical signal recorded by differential pulse voltammetry (DPV). Herein, a novel sandwich-type immunosensor was designed using n-C 60 -PdPt/N-GNRs as the sensing matrix and Pt-PMB as the signal label for sensitive detection of PCSK9. Under optimal conditions, the label-free immunosensor showed a linear range of 10 pg mL −1 to 100 ng mL −1 with a detection limit of 3.33 pg mL −1 (S/N=3), and the sandwich-type immunosensor exhibited a linear range of 100 fg mL −1 to 100 ng mL −1 with a detection limit of 0.033 pg mL −1 (S/N=3) for PCSK9 detection, indicating its potential application in clinical bioassay analysis.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Shanpeng Li,Yuling Zhuo,Dong Liu,Hui Pan,Zhenbo Wang
Improving the Pt atoms utilization efficiency on self-supported electrodes is crucial for industrial seawater hydrogen production , but effective strategies are still lacking. Herein, we reported a novel strategy to anchor highly surface-exposed Pt single atoms on Ni 3 S 2 /Co 9 S 8 with abundant S vacancies (Pt–Ni 3 S 2 /Co 9 S 8 –Sv) as a self-supported electrode. Physical characterizations and theoretical calculations confirm that the strong Pt–S electron bridges with the coordinating role of surface S vacancies triggers the d -orbital electron rearrangements and regulates the local electron structures between the Co/Ni and Pt sites. Notably, the Pt–Ni 3 S 2 /Co 9 S 8 –Sv electrode displays an ultralow overpotential of 18 mV at 10 mA cm −2 in alkaline seawater . More importantly, our Pt–Ni 3 S 2 /Co 9 S 8 –Sv electrode assembled into an alkaline electrolysis cell can work continuously for 50 h under alkaline seawater @ 60 °C. This work provides a promising strategy for designing highly surface-exposed single-atomic catalyst for large-scale hydrogen evolution through seawater electrolysis.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Li Tian,Shuning Yang,Guangping Ma,Pengfei Han,Hanyue Jiang,Wenzhuo Wang,Juan Lu
The electrochemiluminescence (ECL) sensor for detecting oxytetracycline (OTC) was constructed by sequentially modifying luminol@β-cyclodextrin (β-CD) and Ni-MOF@Pt NPs on the electrode surface. In this platform, luminol serves as a luminescent reagent, and Pt NPs serve as co-reaction accelerators of the system. β-CD and Ni-MOF are used as carriers to carry luminol and Pt NPs respectively, and the luminescence intensity was further improved by increasing the carrying capacit. In addition, the OTC quenching strategy is adopted, and the constructed sensor is based on the energy transfer of luminol. Under optimal conditions, this sensor exhibited the linear detection range of OTC was found to be between 2.0 × 10 −12 M to 2.0 × 10 −7 M, with a detection limit of 6.7 × 10 −13 M (S/N = 3). The sensor showed good high selectivity and ultra-sensitivity, and obtained satisfactory results when detecting honey and milk samples.
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