ACS Applied Energy Materials
·
2020
·
IF 4.473
Liting Cui,Zhengjian Li,Haining Wang,Lirui Cui,Jin Zhang,Shanfu Lu,Yan Xiang
It is of great significance to reduce the amount of platinum for the oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells. In this work, a copper single atom coordinated by nitrogen doped carbon nanotubes is employed as a support for the deposition of platinum nanoparticles (Pt/Cu-SAC), according to the prediction of the density functional theory calculation, which reveals the ORR activity of Pt/Cu-SAC should be improved in comparison to that of Pt/C due to the weaker adsorption of oxygen. The prepared Pt/Cu-SAC exhibits more promising ORR activity than the commercial Pt/C due to the synergetic effect of Cu-SAC on the Pt particles. Furthermore, the fuel cell based on Pt/Cu-SAC with a cathode Pt loading of 0.025 mg cm–2 exhibits a peak power density of 526 mW cm–2, which is quite similar to that obtained with the commercial Pt/C with a cathode Pt loading of 0.1 mg cm–2. The Pt/Cu-SAC paves the way to design low-Pt cathode catalysts for the polymer electrolyte membrane fuel cells.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 12
·1-8
·
IF 2.584
Huang Yong,Li Pengcheng,Xu Liqun,Yu Yajie,Chen Wanping
Two kinds of WO 3 powders with average size of 100 nm and 5 μm have been used to prepare Pt–WO 3 porous composite ceramics, whose WO 3 grains are around 1 and 5 μm, respectively. The ceramics with 1 μm WO 3 grains show a sensitivity of 755 to 0.08% H 2 – 20% O 2 – N 2 in air of 30% relative humidity (RH) at room temperature, but show no response to this concentration of hydrogen in air of 50% RH due to the depression effect of water, which indicate a relatively low humidity tolerance for the ceramics. In contrast, the ceramics with 5 μm WO 3 grains show sensitivities of 1200 and 80 to 0.08% H 2 – 20% O 2 – N 2 at room temperature in air of 30% and 50% RH, respectively, and a sensitivity of 8 to 0.02% H 2 – 20% O 2 – N 2 in air of 70% RH, which represent an ultrahigh humidity tolerance. These results clearly demonstrate that the microstructure of room-temperature hydrogen sensitive metal oxide (MOX) materials exerts a decisive influence on their humidity tolerance. Much attention should be paid to MOX materials with large and even ultra-large MOX grains when room-temperature MOX gas sensors with high humidity tolerance are being developed.
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ANALYST
·
2021
·Vol. 146
·期 18
·5691-5703
·
IF 4.616
Jingjie Tang,Guoxun Zhu,Peng Li,Pingjun Zhang,Fang Peng,Fei Meng
Platinum(II) complexes are the most commonly used anticancer drugs and potential optical materials, but the detectability of Pt(II) complex-based probes is seldom reported. In our previous work, a tetradentate Pt(II) complex Pt-CHO was utilised as a ‘turn-off’ probe to detect ClO− and image cancer cells. However, the recognition mechanism has not been completely clarified and there are still doubts. In this work, three Pt(II) complexes, Pt-H, Pt-CHO and Pt-COOH, were developed to elucidate the mechanism of this class of complexes and refine their property studies. As a result, the UV–visible absorption and luminescence emission experiments, as well as the mass spectrum, proved that the oxidation of Pt(II) to Pt(IV) was the real reason for luminescence quenching, which has nothing to do with aldehyde groups. This first reported mechanism introduces a new type of ClO− probe based on Pt(II) complexes, thereby expanding the application fields of platinum complexes. Moreover, the quantum yield measurements, the effect of biomolecules and reversibility were studied to improve the properties of the probes. Theoretical calculations were used to gain an in-depth understanding of optical characteristics and related mechanisms. The cell imaging of RAW264.7 cells under endogenous ClO− proved the potential of the probes in bioimaging.
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高影响因子
Materials Today Nano
·
2021
·
IF 8.109
B. Yi,H. Zhao,L. Cao,X. Si,Y. Jiang,P. Cheng,Y. Zuo,Y. Zhang,L. Su,Y. Wang,C.-K. Tsung,L.-Y. Chou,J. Xie
Mixed-metal metal-organic frameworks (MM-MOFs) contain more than one type of metal node, which can improve or even introduce new features compared with the single metal frameworks. Traditionally, most of the MM-MOFs are synthesized by solution method which requires all the metal ions to form stable coordination with the ligand in a single framework and therefore limits the choice of the metal ions. In this work, Pt-doped Zn-MOF-74 (PtZn-MOF-74) has been prepared through a mechanochemical conversion approach from Pt-doped ZnO (Pt–ZnO) directly. The absence of a large quantity of solvent limits the solvation and diffusion of growth species during the mechanochemical conversion and therefore prevented the agglomeration of Pt dopants in PtZn-MOF-74. CO oxidation was used to evaluate the catalytic performance of the prepared MM-MOFs. Compared with inert Zn-MOF-74, PtZn-MOF-74 with unsaturated coordinated Pt at elevated temperature can act as the active sites to catalyze CO oxidation reaction. This study provides a novel design strategy for the synthesis of MM-MOFs with extended functionalities.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Yuwei Deng,Qing Long,Yifan Gao,Kefei Chen,Hongyuan Sheng,Yajun Wang,Angang Dong
The durability of proton-exchange membrane fuel cells is often compromised by the corrosion of carbon supports in oxygen reduction reaction (ORR) cathodes under harsh operating conditions, including high oxygen concentration, elevated humidity, low pH, and high potentials. To overcome this limitation, we report the synthesis of a 2D mesoporous graphitic nanocarbon framework (MGF) via chemical etching and high-temperature graphitization. The resulting MGF features a monolayer, highly ordered nanoframe architecture that offers enhanced structural stability and conductivity. Leveraging these structural advantages, we designed fully exposed Pt nanoparticles anchored on the MGF (Pt@MGF) as a model system to investigate the interplay between graphitization degree, pore architecture, and electrocatalytic performance. Among the variants, Pt@MGF-1200, synthesized at 1200 °C, demonstrates optimized mesopore confinement and strong Pt–carbon interactions. This results in superior electrochemical durability and ORR activity, positioning Pt@MGF-1200 as a promising alternative to conventional Pt/C catalysts. Graphical In this work, a novel 2D mesoporous graphitic nanocarbon framework (MGF) is synthesized through chemical etching of 2D Fe 3 O 4 nanocube superlattices (Fe 3 O 4 NCSLs) and subsequent high-temperature graphitization. MGF possesses large specific surface area, open porous architecture, and high graphitization degree, making it an excellent platform for constructing Pt-based ORR electrocatalysts. The resulting Pt@MGF catalyst exhibits superior ORR activity and durability over commercial Pt/C catalysts.
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FUEL
·
2025
·
IF 7.5
Ruichen Wang,Chao Yu,Juanjuan Gong,Qingfa Su,Hui Chen,Canyan Yang,Shaodi Sun,Zhiwei Huang,Huazhen Shen,Huawang Zhao,Bihong Lv,Xiaomin Wu,Guohua Jing
Identification of active sites governing the performance of indoor formaldehyde (HCHO) oxidation at ambient temperature and low humidity is crucial for developing improved catalysts, but remains challenging. It has recently been discovered that the effective dissociation of water is of importance for HCHO oxidation at low humidity. Here, we have elaborately designed a Pt supported on three-dimensionally ordered mesoporous CeO 2 catalyst (Pt/kit-CeO 2 ). The Pt/kit-CeO 2 catalyst achieves ∼ 95 % CO 2 yield for a long time. The results indicate that the abundant oxygen vacancies and single coordination-unsaturated Ce sites on mesoporous CeO 2 enhance H 2 O dissociation, leading to the generation of a substantial amount of terminal hydroxyl groups (OH t ). These OH t groups promote the oxidation of intermediate dioxymethylene (DOM) and formate species, thereby regulating the catalytic activity. Additionally, the dispersed Pt facilitates the activation of O 2 , generating active oxygen species (O*) that work synergistically with OH t groups to promote the conversion of formates into CO 2 . The in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) further elucidated the mechanism of catalyst promoting HCHO oxidation: HCHO (+O*) → DOM (+OH t ) → HCOO – /HCOOH (+OH t /O*) → CO 3 2– → CO 2 . We anticipate that this knowledge will inspire the development of Pt-based catalysts specifically tailored for low humidity.
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BIOSENSORS & BIOELECTRONICS
·
2012
·
IF 5.602
Xiangheng Niu,Chen Chen,Hongli Zhao,Yan Chai,Minbo Lan
Novel snowflake-like Pt–Pd bimetallic nanoclusters (Pt–PdBNC) were synthesized on a screen-printed gold nanofilm electrode (SPGFE) substrate by electrochemically reducing precursors with a new constant potential/multi-potential step deposition strategy. The electrocatalytic behavior of the modified electrode (SPGFE/Pt–PdBNC) towards H 2 O 2 was investigated. The results indicate that the as-prepared Pt–PdBNC significantly enhances the electrochemical reduction of H 2 O 2 in neutral media, exhibiting preferable electrocatalytic performance compared to Pt and Pd monometallic nanoclusters . Under optimum conditions, SPGFE/Pt–PdBNC offers linear responses for H 2 O 2 in the concentration range from 0.005 to 6 mM with an ultrahigh sensitivity of 804 mA M −1 cm −2 and excellent selectivity. Furthermore, glucose oxidase was immobilized on the Pt–PdBNC structure, and the fabricated biosensor presents favorable properties for glucose sensing.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·677-683
·
IF 2.195
Wang Jing,Shen Bowen,Zhu Kongjun,Qiu Jinhao
With the ever increasing requirements for the structural health monitoring systems, the deposition of the piezoelectric films on the metallic or structural materials has turned out to be an important issue. Pb(Mg, Nb)O 3 -PbTiO 3 films with different buffer layers, i.e., in situ NiO, pre-fabricated NiO and LaNiO 3 , were successfully deposited on the Ni foil via the chemical solution deposition. The crystal structures and electric performances showed evident dependence on the buffer layer. Pre-deposited NiO and LaNiO 3 efficiently prevented the diffusion and complex reactions occurring at the interface, offered abundant nucleation sites, and thus helped the formation of pure high-qualified perovskite PMN-PT films at higher annealing temperatures.
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CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Qing Yu,Shiyi Wang,Mengru Wang,Xiaoling Mou,Ronghe Lin,Yunjie Ding
Acetylene coupling with ethylene dichloride, which uses both coal and oil resources, is attractive for sustainable PVC manufacturing. Herein, highly active and stable carbon nitride-based catalysts were developed by a novel pre-oxidation-pyrolysis process, affording unprecedented dehydrochlorination activity with good durability. The best-performing system was further modified with different precious metals (Au, Pt, and Ru) to promote the hydrochlorination chemistry between the in-situ formed hydrogen chloride and acetylene co-feed. The presence of metal centers intensifies the hydrochlorination activity but weakens the dehydrochlorination ability due to competitive adsorption between the two reactants at the metal sites. Superior coupling performance was achieved over C 3 N 4 /AC and single-atom Au/C 3 N 4 /AC catalysts in cascade reactors. Our results strongly suggest that dehydrochlorination is an essential step in the coupling reaction, and the activation of acetylene and ethylene dichloride molecules requires different active sites that should be engineered in future work.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
·
IF 4.6
Jiamin Huang,Hong Zhao,Xinlian Chen,Tianran Lin,Li Hou,Shulin Zhao
To meet the increasing demands for highly active and stable nanozymes for bioanalysis, Pt nanoparticles (NPs) were successfully supported on the surface of hydrogen-bonded organic frameworks (Pt/HOFs) to obtain a stable, multifunctional and highly active nanozyme for the colorimetric detection of alkaline phosphatase (ALP). Through a redox reaction, Pt precursors are reduced to ultrasmall Pt NPs that are loaded on HOFs. The Pt/HOFs nanozyme showed excellent oxidase-like, peroxidase-like and some catalase-like activity. To avoid the signal instability caused by H 2 O 2 decomposition, the oxidase-like activity of Pt/HOFs was applied for the detection of ALP using 3,3′, 5,5 ′-tetramethylbenzidine (TMB) as a chromogenic substrate. When the substrate L-ascorbic acid 2-phosphate (AAP) is present, ALP can catalyze AAP to produce strongly reductive ascorbic acid (AA). AA can reduce the oxidation product of TMB. Therefore, a colorimetric sensing strategy for ALP detection was constructed. The linear range of the strategy was from 0.5 to 8 mU mL −1 , and the detection limit was 0.46 mU mL −1 . Finally, the strategy was successfully applied to the detection of ALP in human serum, which provided a reliable strategy for the colorimetric detection of clinical ALP. This study not only presents a simple approach to maintain the high activity of nanoparticle-based nanozymes, but also expands the application of multifunctional HOF-based materials for future applications.
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高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Chang Lv,Tao Wang,Yeting Fang,Yulong Ying,Lvlv Ji,Lei Liu,Sheng Wang
Bubble-propelled catalytic micro-/nanomotors, known for their strong thrust, rapid speeds, and long lifespan independent of ionic strength, have attracted significant attention for applications in environmental remediation. While single-atom catalysts have demonstrated remarkable catalytic efficiency, their performance alone often lacks the necessary activity for efficient hydrogen peroxide (H2O2) decomposition, limiting their use in bubble-propelled systems. To address this, we present a novel approach for fabricating Pt-decorated titanium dioxide micro-bowls (PtSA&C-TiO2) featuring dual active sites with atomically dispersed Pt single atoms (SAs) and atomic clusters (Cs). This design capitalizes on the consistent metallic characteristics of Pt Cs, which significantly enhance the decomposition of H2O2 and propel the Janus micromotors to a speed of 113 ± 47 μm s−1 in aqueous solutions. Furthermore, these PtSA&C-TiO2 Janus micromotors exhibit excellent photocatalytic activity for pollutant degradation, which is enhanced by the synergistic effect of Pt SAs and Pt Cs. The study also discusses the factors influencing the self-assembly of Janus TiO2 micro-bowls, emphasizing the simplicity and controllability of the fabrication process, which enables large-scale production. This work not only demonstrates the potential of PtSA&C-TiO2 Janus micromotors for environmental applications, but also offers new insights into the design and application of single-atom-based micromotors.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Mingjie Zhong,Yanan Chong,Yifei Li,Zhiyuan Zeng,Chenghao Duan,Shumin Liu,Yongcai Qiu,Daiqi Ye,Guangxu Chen
The Pt/CeO2 catalyst is widely studied for the catalytic purification of volatile organic compounds (VOCs) due to its distinctive nanoscale features, including strong metal–support interaction (SMSI), abundance of oxygen vacancies, and excellent redox properties, and stability of CeO2 nanomaterials. However, significant challenges remain, including the poisoning effect of water vapor and the excessive strengthening of the SMSI, which lead to an increased Pt valence state and loss of activity. In this work, we present a g-C3N4–CeO2 nanocomposite-supported Pt catalyst (Pt/CN–CeO2) for enhancing the catalytic oxidation of toluene. The electron-rich material, g-C3N4, interacts with CeO2 to generate additional oxygen vacancies and donates electrons to Pt nanoparticles, facilitating the formation of active Pt0 species and improving the catalytic efficiency of toluene oxidation. The optimized Pt/CN–CeO2 nanocomposite catalyst achieves a 90% toluene conversion at 203 °C, in contrast to 254 °C required for the conventional Pt/CeO2 catalyst under the same conditions. In addition, the optimized Pt/CN–CeO2 nanocomposite catalyst exhibits strong resistance to water poisoning and exceptional stability for toluene oxidation, consistently maintaining a toluene conversion rate above 99% at 210 °C for 50 h. These findings offer valuable insights into the design of advanced catalytic materials at the nanoscale and facilitate the application of Pt/CN–CeO2 nanocomposite catalysts in environmental catalysis.
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