JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Bo Fu,Haicheng Chen,Zhihong Yan,Zhenying Zhang,Jincheng Chen,Tailin Liu,Kang Li
In this paper, a novel electrochemical sensor based on the combination of multi-walled carbon nanotubes and platinum nanoparticles (MWCNTs-PtNPs) as peroxidase mimics was developed for simultaneous detection of homovanillic acid (HVA) and vanillylmandelic acid (VMA) in human urine with excellent resolution, which were separated about 200 mV apart by electrochemistry . The modified electrode was investigated by different methods including electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Electrochemical studies show that MWCNTs-PtNPs modified GCE has an excellent separation performance for HVA and VMA with little overlapping, showing significant peroxidase mimetic oxidation catalysis . Under optimal conditions, the sensor exhibits good linear responses for HVA and VMA in the range of 2 × 10 −7 mol L −1 to 8 × 10 −5 mol L −1 and 5 × 10 −7 mol L −1 to 8 × 10 −5 mol L −1 with the detection limits of 8 × 10 −8 mol L −1 for HVA and 1.73 × 10 −7 mol L −1 for VMA (S/N = 3), respectively. Furthermore, MWCNTs-PtNPs/GCE was successfully applied to the simultaneous determination of HVA and VMA in human urine samples.
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高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 18
·10799-10807
·
IF 10.7
Wei Cao,Yiyang Mao,Bin Hu,Yongqing Yang,Wei Zhou,Zongping Shao
Proton exchange membrane fuel cells (PEMFCs) have been commercialized, but their elevated costs and inadequate catalytic efficiencies for the oxygen reduction reaction (ORR) have hindered broader use. Metal oxides demonstrate high stability and water retention, as well as strong interactions with metal nanoparticles. However, their conductivities and surface areas are lower than those of carbon. This study introduces a novel Pt–oxide–carbon composite ORR catalyst. The Pt nanoparticles were anchored to a W0.02–SnO2–C substrate and demonstrated significantly higher stability and catalytic activity. The composite electrocatalyst exhibited a mass activity (MA) of 0.23 A mgpt−1 at 0.9 V (vs. RHE). The use of Pt/W0.02–SnO2–C as the cathode in a fuel-cell assessment (under H2–air conditions at 80 °C) resulted in a peak power density of 1.04 W cm2, and 89.2% of the initial value was retained after 50 000 cycles over the potential range 0.60–0.95 V. Due to the electronic metal–support interaction (EMSI) between Pt and W0.02–SnO2–C, electron transfer from Pt to the support was accelerated. This diminished the surface electron density of Pt and inhibited the dissolution of Pt nanoparticles. Thermogravimetric (TG) analyses were also conducted to examine the water losses from the W–SnO2–C and pure XC-72R carbon black samples at high temperatures. The water weight in W0.02–SnO2–C decreased by 15.3%, which was lower than the 18.8% decrease from XC-72R. Additionally, in the membrane electrode assemblies (MEAs) tested at 100% RH and 60% RH, the peak power density of the fuel cell with Pt/W0.02–SnO2–C was decreased by 13.7% at 60%, in contrast to the 25.1% reduction observed for JM Pt/C. These findings highlight the superior water retention of W0.02–SnO2–C, which expedited proton transfer in the catalytic layer. This improvement enhanced the catalytic performance, offering significant advantages for practical PEMFCs.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ping Guo,Xuyang An,Xinxin He,Yinhua Hu,Jia Zhang
NO 2 is a prevalent atmospheric pollutant known to cause significant harm to both the environment and human health. In practical applications, the development of NO 2 sensors capable of functioning over a wide humidity range with high sensitivity and stability is crucial. Here, the Pt-decoration multi-scale three-dimensional Bi 2 S 3 nanoflower structure assembled by one-dimensional nanorods and two-dimensional reticulated nanomeshes was constructed by integrating the geometrical and electronic effects. The Pt/Bi 2 S 3 based sensors exhibit a high response of 3.92 and rapid response/recovery times of 15 s/136 s to 1 ppm NO 2 at room temperature. Furthermore, the Pt/Bi 2 S 3 based sensors show excellent selectivity and stability across a wide range of humidity levels (10 %-90 %RH). Finally, a portable NO 2 detector was designed for data acquisition and wireless transmission to enable real-time gas detection and hazard warning. Our study presents a multi-scale structure for sensitive materials design and practical application of high-performance NO 2 sensors operated in a wide humidity range at room temperature.
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APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Pengyu Niu,Ping Liu,Hongjuan Xi,Jun Ren,Minggui Lin,Qiang Wang,Xiaoyan Chen,Litao Jia,Bo Hou,Debao Li
The formation of centrally branched iso-dodecane was controlled by absorption modes of alkene intermediates on ZSM-22, which included pore mouth type and key lock type. In this paper, we have designed and synthesized two kinds of ZSM-22 catalysts for selective formation of iso-dodecane with branched chain at more central positions from n -dodecane hydroisomerization. Aluminosilicate ZSM-22 was modified via carbonization of template to block the micropores and borosilicate ZSM-22 was synthesized. The characterization results and performance evaluation validated that micropore blockage could limit the pore mouth type at low reaction temperatures which favored the formation of iso-dodecane with side chain near the end of the carbon chain. Owing to the weak acid strength, higher temperatures, which favored the key lock mode, were needed to run the n -dodecane hydroisomerization over Pt/borosilicate ZSM-22. Both the two strategies for catalyst design achieved key lock adsorption mode and improvement of the selectivity for centrally branched iso-dodecane. Most importantly, weak acid sites on borosilicate ZSM-22 could catalyze double-bond isomerization reactions, which enhanced centrally branched iso-dodecane distribution up to more than 47%. Our research provides a prospective strategy for selective formation of centrally branched iso-alkanes and Pt/borosilicate ZSM-22 is expected to have potential applications in n-alkane hydroisomerization.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2011
·
IF 4.749
Quan Gu,Xianliang Fu,Xuxu Wang,Shifu Chen,Dennis Y.C. Leung,Xiuqiang Xie
The adsorption behavior and the photocatalytic reforming (PR) process of 2-propanol over Pt (1 wt.%)/TiO 2 (PT) photocatalyst have been investigated by Fourier transform infrared (FTIR) spectroscopy. Both the adsorption complexes and the reforming intermediates formed on the PT and the gas-phase were determined and identified by FTIR spectra. The results indicated that the first layer surface of the PT mainly consisted of chemisorbed 2-propanol (Ti–OCH(CH 3 ) 2 ) through the condensation of 2-propanol with surface Ti–OH or dissociative adsorption with undercoordinated Ti atoms, while the second layer consisted of physisorbed 2-propanol by interaction with the chemisorbed one or the formed H 2 O via hydrogen-bond. Under UV irradiation, a rapidly deprotonation of 2-propoxide occurred by the attack of holes (h + ) and resulted in the formation of acetone, which was then slowly oxidized to acetate and formate species by the hydroxyl radicals ( OH). The carboxylates finally decarboxylate over the PT to evolve CO 2 and CH 4 via the photo-Kolbe reaction. According to the results, a reforming mechanism was proposed. The role of the OH groups contained in 2-propanol and its intermediates were found to serve as anchors for their adsorption and to involve the formation of h + transport ways.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 21.1
He Xu,Xinyu Wang,Jingjing Wang,Jingyao Wang,Yujie Liu,Lianghui Xia,Yingying Yong,Yanfei Jian,Reem Albilali,Chi He
The widely presented industrial light alkanes (LAs) have posed significant hazards to the environment and human health; however, the efficacious catalytic purification of LAs is still greatly suffered from their strong chemical stability and catalyst deactivation due to the presence of sulfur-containing impurity in practical exhausts. Herein, cobalt phosphate (Co 3 (PO 4 ) 2 )-modified Pt/CeO 2 catalysts (Pt/CeO 2 - x CP) with boosted activity and sulfur resistance were rationally engineered. Results revealed that Pt/CeO 2 -0.2CP shows the highest C 3 H 8 oxidation activity with 90 % of which oxidized at 260 °C and apparent activation energy ( E a ) of 84.39 kJ∙mol −1 , obviously lower than that of Pt/CeO 2 . Remarkably, the activity of Pt/CeO 2 -0.2CP is well-maintained in 24 h of successive operation with the co-existence of 250 H 2 S, while over 20 % of C 3 H 8 conversion reduction can be found over Pt/CeO 2 due to the deactivation of Pt 4+ active sites by surface sulfation. The Co 3 (PO 4 ) 2 -Pt interface promotes the electron transfer from Pt δ+ to phosphorus component and weakens the Pt-O-Ce bond, thereby generating more highly active Pt 4+ sites and oxygen vacancy, polarizing the electron cloud around the C-H bond and oxygen molecules and promoting C 3 H 8 oxidation. Meanwhile, the Co 3 (PO 4 ) 2 modification optimizes the surface acidity of Pt/CeO 2 -CP, effectively weakens the adsorption and oxidation of H 2 S, and maintains the formation and consumption of high active oxygen species, resulting in strong sulfur resistance. This work provides important insights for the rational design of efficient sulfur-tolerant catalysts towards LAs purification under harsh conditions.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhixiang Chen,Longhai Zhang,Weiquan Tan,Lei Shi,Zheng Chen,Qi Sun,Keliang Wang,Weiyue Zhao,Zhiming Cui
Achieving high activity and stability while reducing Pt loading remains a major challenge in developing cathode oxygen reduction reaction (ORR) catalysts for H 2 /air fuel cell. Here, a novel low-Pt intermetallic nitride catalyst (PtFe 3 N) consisting of a strained Pt shell and an antiperovskite-type PtFe 3 N core on a confinement-effect carbon support are synthesized via an initial impregnation-co-reduction strategy. The MEA with PtFe 3 N/DMC as cathode yields a current density of 1370 mA cm −2 at 0.6 V and maximum power density of 0.92 W cm −2 , significantly outperforming that of Pt/C benchmark (1170 mA cm −2 and 0.79 W cm −2 ). Besides, the PtFe 3 N/DMC enabled MEA has a lower performance decay rate (1.9%) compared to the MEA with Pt/C (48.2%). EXAFS, XPS and DFT calculations jointly support that the cooperative strain effects induced by Fe and N endows PtFe 3 N with an optimal Pt d-band center position and accelerated kinetics. Furthermore, the introduction of N elements promoted the strong metal-N interactions, which effectively suppress Fe dissolution and significantly improve the ORR durability under operating conditions. This work provides a novel strategy for low-Pt intermetallic to enhance the corrosion resistance of 3d transition metals and to improve the ORR activity.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Yulian Tang,Wenxin Gou,Xue Lv,Xuemei Zhou,Junkai Hao,Chengjie Sun,Tao Sun,Lei Hu,Zhengquan Yan
Conveniently and efficiently monitoring I − and Hg 2+ in agricultural products or drinking beverages for the protection of human health is currently a great challenge. With this aim, a Ag-Pt bimetal quantum-dot nanozyme boosted by bioactive folic acid (FA@Ag-Pt QDs) was first developed for multichannel monitoring of I − and Hg 2+ in this work using a two-step liquid-phase reduction method. Not only did the present FA@Ag-Pt QDs possess superior peroxidase-like activity with Michaelis constant ( K m ) and maximal reaction rate ( V max ) of 0.01 mM/2.95 × 10 −8 M·s −1 and 1.15 mM/3.88 × 10 −8 M·s −1 , respectively, trace Hg 2+ or I − could exclusively alter their enzyme-mimic performance with obvious color changes from blue to colorless or dark blue. I − could also strengthen the inherent fluorescence property of FA@Ag-Pt QDs. When applied for visual monitoring of I − and Hg 2+ in real beverages or iodine-containing agricultural products, the detection recoveries were 93.9 %–105.3 % and 96.8–104.3 % with low detection limits of 6.56 × 10 −8 mol/L and 4.00 × 10 −10 mol/L (S/N = 3), respectively. The recovery and detection limit for fluorescent detection of I − were 95.8 %–104.1 % and 1.75 × 10 −8 mol/L (S/N = 3), respectively. The mechanisms driving the improved peroxidase-like activity of FA@Ag-Pt QDs and their selective monitoring of Hg 2+ and I − were illustrated in detail. The proposed FA@Ag-Pt QDs will act as an efficient sensor for the practical multichannel monitoring of Hg 2+ and I − , with superior catalytic signal amplification.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Fan Yang,Bo Yang,Karuppasamy Kohila Rani,Yuhui Wei,Xinglan Peng,Limin Wang,Xiaotian Liu,Du-Hong Chen,Youjun Fan,Wei Chen
Carbon-based materials have been often employed as electrocatalytic substrates because of their large surface area/highly porous structure . Similar to carbon substrates, the non-carbon related materials such as transition metals also play an important role in improving catalytic performance. However, the simultaneous synthesis and metallic functionalization of carbon substrates is a highly challenging issue. Herein, a hydrothermal method has been used for the preparation of Ni-functionalized porous carbon balls. The significant role of Ni 2+ ions in the synthesis of porous carbon balls has been confirmed. The results of transmission electron microscopy indicate that, the as-prepared porous carbon balls were suitable for the dispersion of Pt nanoparticles with small particle size (less than 4 nm). In addition to providing the OH ads species, the Ni can also modify the surface electronic structure of Pt. Electrochemical measurements results reveal that, under the strong interactions between Ni and Pt, the as-prepared porous carbon balls supported Pt nanoparticles (Pt/Ni-CB) catalyst possesses excellent electrocatalytic activity , stability and CO anti-poisoning capability towards methanol electrooxidation reaction (MOR). This work opens a novel idea for the construction of the metal functionalization of carbon substrates and their subsequent applications in other electrocatalytic reactions .
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiongwei Zhong,Shulong Ye,Jun Tang,Yuanmin Zhu,Duojie Wu,Meng Gu,Hui Pan,Baomin Xu
Fabrication of Pt-based electrocatalysts with high activity and excellent durability is critical for the practical applications into zinc-air battery (ZAB). In this work. A novel strategy for the encapsulation of Pt species into the cavities of Fe-doped zeolite imidazolate framework is proposed to increase the density of active metal atoms and improve the activity effectively, where both isolated Pt and Fe single atoms anchored on nitrogen-doped carbon (PtFeNC) are obtained by a simple pyrolysis. Impressively, PtFeNC delivers a half-wave potential of 0.895 V (vs. RHE), Moreover, PtFeNC exhibits a lower yield of peroxide species than FeNC. Importantly, the ZAB battery shows a specific capacity of as high as 807 mA h/g at a discharge current density of 10 mA/cm 2 . Our findings show that dual- and multi- metallic single atom catalysts with abundant active sites can be achieved to boost electrocatalytic activity for their practical applications in energy storage though the new tactic.
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BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Zhiyong Yan,Feng Wang,Pingye Deng,Yu Wang,Kai Cai,Yanhui Chen,Zonghua Wang,Yang Liu
In this work, a novel and sensitive electrogenerated chemiluminescence (ECL) biosensor for protein kinase A (PKA) activity analysis and relevant inhibitor screening was proposed based on bimetallic catalysis signal amplification and recognition of Au and Pt nanoparticles loaded metal-organic frameworks (Au&Pt@UiO-66) nanocomposite . After being phosphorylated by PKA in the presence of ATP , Au&Pt@UiO-66 probes were specifically chelated to the modified electrode by forming Zr-O-P bonds between the surface defects of UiO-66 and the phosphorylated kemptide . Due to the high synergistic catalysis of Au&Pt@UiO-66 nanocomposites to the luminol-H 2 O 2 reaction, the ECL signal of luminol was greatly enhanced. Moreover, UiO-66 afford numerous Zr defect sites for high efficient phosphate group recognition, and can also prevent the nanoparticles from aggregating during catalytic reactions . Thus, the excellent performance of the ECL biosensor with high sensitivity and superior stability was obtained. Under the optimized conditions, the detection limit for PKA activity was 0.009 UmL −1 (S/N = 3). Meanwhile, the ECL biosensor was successfully applied in inhibitor screening and cell lysates PKA activity analysis, showing great promise in kinase related research.
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高影响因子
TALANTA
·
2018
·
IF 4.244
Qian Luan,Xin Xiong,Ning Gan,Yuting Cao,Tianhua Li,Dazhen Wu,Youren Dong,Futao Hu
An ultrasensitive colorimetric aptasensor was developed for antibiotics detection, with chloramphenicol (CAP) as model target, using DNAzyme labeled Fe-MIL-88-Pt as novel peroxidase mimic signal tags and target-triggered circular strand-displacement polymerization (CSDP) for signal amplification. The system consists of two components which can partially hybridize with each other: one is capture probe which was formed through immobilizing hairpin DNA containing aptamer sequence on magnetic beads (MB-cDNA), another is signal tag which was constructed through labeling single strand DNAzyme (G-quadruplex/Hemin) which can partially hybrid with cDNA on platinum nanoparticles functionalized Fe-MIL-88 (MIL-88-Pt-DNAzyme). All components of MIL-88, Pt and DNAzyme in the tag can act as peroxidase mimic to triply catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 into a blue-colored oxidized TMB (oxTMB) for the colorimetric readout. Thus distinctive signal can be observed by naked eye even in presence of 0.02 nM tags. In the presence of target and primer, cDNA loop can open to form cDNA/CAP intermediates, enabling primer to hybridize with the exposed sequences of the cDNA, which initiated target assisted CSDP recycles. Then numerous signal tags were released into supernatant to catalyze TMB for color development. There was a liner relationship between the absorbance and the concentration of CAP in the range of 0.1 pM (0.0323 pg/mL) to 1000 pM (323 pg/mL) with the detection limit of 0.03 pM (0.0097 pg/mL). The ultra-high sensitivity was ascribed to the multiplex catalytic activities from the tags and CSDP based signal amplification. Furthermore, this method can produce signals being observed by naked eye to facilitate in-situ detection and be further extended to detect other antibiotics in food just by simply replacing cDNA on the sensing system.
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