ACS Sensors
·
2024
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IF 8.2
Chengming Sui,Mingxue Zhang,Yueyue Li,Yilin Wang,Yuanzhen Liu,Ziqi Liu,Jihao Bai,Fengmin Liu,Geyu Lu
Bimetallic nanocrystals (NCs) have obtained significant attention due to their unique advantages of the intrinsic properties of individual metals and synergistic enhancements resulting from the electronic coupling between two constituent metals. In this work, Pd@Pt core–shell NCs were prepared through a facile one-pot solution-phase method, which had excellent dispersion and uniform size. Concurrently, ZnO nanosheets were prepared via a hydrothermal method. To explore their potential in nitrogen dioxide (NO2) gas sensing applications, sensitive materials based on ZnO nanosheets with varying mass percentages of Pd@Pt NCs were generated through an impregnation process. The sensor based on 0.3 wt % Pd@Pt-ZnO exhibited remarkable performance, demonstrating a substantial response (Rg/Ra = 60.3) to 50 ppb of NO2 at a low operating temperature of 80 °C. Notably, this sensor reached an outstanding low detection limit of 300 ppt. The enhancement in gas sensing capabilities can be attributed to the sensitization and synergistic effects imparted by the exceptional catalytic activity of Pd@Pt NCs, which significantly promoted the reaction. This research introduces a novel approach for the utilization of core–shell structured bimetallic nanocrystals as modifiers in metal-oxide-semiconductor (MOS) materials for NO2 detection.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jiaming Li,Jiawei Hu,Quan Jiang,Huan Yu,Wen Xiao,Diab Khalafallah,Fang Yu,Chao Liu,Feng Zhang,Qinfang Zhang
The construction of highly efficient photocatalysts for generating high-purity hydrogen (H 2 ) through a sustainable water decomposition system is a feasible option to replace conventional non-renewable energy resources. Here, we report a simple chemical reduction approach to embed Cu–Pt alloy nanocrystals on the C 3 N 5 (CN) matrix, creating a Schottky heterojunction. The structural morphology, crystal phase, light-harvesting capacity, and photo-electrochemical properties of as-prepared heterostructures were investigated. The uniformly anchored Cu–Pt alloy nanocrystals improve the photocatalytic H 2 evolution (PHE) activity by promoting the separation and transfer of photogenerated carriers and inhibiting recombination. Meanwhile, the alloyed nanocrystals strengthen the absorption of incident light energy, inducing photothermal energy. This improves the charge carrier separation and promotes the surface reaction kinetics. The PHE performance of as-developed catalysts could be adjusted by optimizing the molar ratio of Cu/Pt ions. Among them, the optimal Cu 1 Pt 3 /CN photocatalyst yields a higher PHE performance (672.85 μmol g −1 h −1 ). Notably, the Cu 1 Pt 3 /CN catalyst also reveals an enhanced photocatalytic activity for H 2 evolution in natural seawater. The possible PHE mechanism in CuPt/CN heterostructures is discussed toward the role of CuPt alloy deposition in boosting photocatalytic efficiency.
研究领域:
材料科学
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能源化学
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光催化技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Jiale Wu,Jiajun Zhang,Liguo Wang,Ziqiang Han,Xiang Hui,Yan Cao,Jianhui Shi,Shuang Xu,Peng He,Huiquan Li
Green production of alicyclic amines is highly desirable but of great challenges. Herein, an efficient one-pot synthesis of alicyclic amines from nitroaromatics was realized with a Pt-Ru bimetallic catalyst. 0.5 %Pt-2.5 %Ru supported on an air-exfoliated C 3 N 4 nanosheet achieved 100.0 % conversion of nitrobenzene (NB) with 98.9 % selectivity of cyclohexylamine (CHA) under mild conditions of 80 °C and 1 MPa, attaining a yield rate for alicyclic amine of 357.9 mmol/g metal ·h. Our study has shown hydrogenation of nitro group and aromatic ring took place in sequence over Pt and Ru in a tandem manner due to the highly selective adsorption. During the hydrogenation, the homolytic dissociation of H 2 occurred on the bimetal sites and the inter-site hydrogen spillover between the bimetal played a crucial role. C 3 N 4 nanosheet as the support not only gave rise to the uniform dispersion of metal nanoparticles, but was crucial in curbing the unnecessary adsorption of intermediate aromatic amines. Our study has also demonstrated the good stability and wide applicability of the Pt-Ru/C 3 N 4 -air catalyst for the hydrogenation of various nitroaromatic derivatives.
研究领域:
催化化学
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绿色化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Research
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2022
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IF 11.036
Qingfei Zhang,Xiaocheng Wang,Gaizhen Kuang,Yunru Yu,Yuanjin Zhao
Biomedical scaffolds have shown great success in postsurgical tumor treatment; their current efforts are focusing on eradicating residual tumor cells and circulating tumor cells and simultaneously repairing postoperative tissue defects. Herein, we report a novel photopolymerized 3D scaffold with Pt(IV) prodrug initiator to achieve the desired features for tumor comprehensive therapy. The Pt-GelMA scaffold was fabricated from the microfluidic 3D printing of methacrylate gelatin (GelMA) bioinks through a Pt(IV)-induced photocrosslinked process without any other additional photoinitiator and chemotherapeutic drug. Thus, the resultant scaffold displayed efficient cell killing ability against breast cancer cells in vitro and significantly inhibited the local tumor growth and distant metastases on an orthotopic postoperative breast cancer model in vivo. Besides, benefiting from their ordered porous structures and favorable biocompatibility, the scaffolds supported the cell attachment, spreading, and proliferation of normal cells in vitro; could facilitate the nutrient transportation; and induced new tissue ingrowth for repairing tissue defects caused by surgery. These properties indicate that such 3D printing scaffold is a promising candidate for efficient postoperative tumor treatment in the practical application.
研究领域:
生物医学工程
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肿瘤学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
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2025
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IF 5.5
Haoqin Zheng,Jun Chen,Jia Shi,Jiarui Wang,Xujian Yang,Lile Dong
Constructing adaptive biomaterials that can overcome rapid carrier recombination and relieve tumor microenvironments such as hypoxia and overexpression of GSH is considered one of the effective strategies for improving tumor therapy. Herein, the Pt–PtTe2 heterojunction was designed for enhancing tumor therapy. Superoxide anion free radicals (•O2–) can be generated through noninvasive in situ ultrasound (US) excitation, mainly since Pt–PtTe2 could produce more electrons and contribute to rapid charge transfer than those of PtTe2, and O2 gains electrons and converts into the •O2–. Pt–PtTe2 features multifunctional nanoenzyme-like activities such as oxidase, catalase, and glutathione peroxidase. Interestingly, Pt–PtTe2 not only catalyzes H2O2 to generate O2 but also oxidizes reducing glutathione (GSH), thereby alleviating tumor hypoxia and amplifying oxidative stress and promoting tumor cell death. Pt–PtTe2 has the desired photothermal-conversion efficiency (50%) under the second near-infrared window (NIR-II) irradiation due to the strong electron thermal effects, further enhancing the efficiency of tumor therapy. This study provides insight into the tumor therapy strategies of an external-energy field-triggered Pt–PtTe2 heterojunction.
研究领域:
生物医学工程
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肿瘤学
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纳米医学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Zinan Zhi,Wanshuo Gao,Jiawei Yang,Chong Geng,Boxuan Yang,Chen Tian,Shurui Fan,Haoyi Li,Jinpo Li,Zhongqiu Hua
In the present work, an amperometric electrochemical hydrogen (H 2 ) sensor was fabricated by solid polymer electrolyte and screen-printed electrodes (SPE). The carbon electrode modified by Pt/C/Nafion film gave an enhanced sensitivity. The Pt/C/Nafion suspension could be directly added dropwise to the carbon electrodes for modification, which was simple and efficient. For hydrogen sensors, it was proved that hydrogen and Pt nanoparticles in aprotic electrolyte were the electrochemical behavior of single electron transfer in an anaerobic environment and the coupling electrochemical behavior with oxygen in an aerobic environment. A solid amperometric gas sensor was fabricated by a 3D printing package with a solid polymer electrolyte and porous ceramic subtracts printed with modified electrodes. It was indicated that the sensor device fabrication was quite simple; however, the sensitivity could be greatly improved.
研究领域:
材料科学
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电化学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
BIOINORGANIC CHEMISTRY AND APPLICATIONS
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2023
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IF 3.8
Jingfang Song,Jian He,Lin Yang,Weiguo Wang,Qinqin Bai,Wei Feng,Ranhui Li
To inhibit the growth of bacteria, the DA-PPI nanozyme with enhanced peroxidase-like activity was synthesized. The DA-PPI nanozyme was obtained by depositing high-affinity element iridium (Ir) on the surface of Pd-Pt dendritic structures. The morphology and composition of DA-PPI nanozyme were characterized using SEM, TEM, and XPS. The kinetic results showed that the DA-PPI nanozyme possessed a higher peroxidase-like activity than that of Pd-Pt dendritic structures. The PL, ESR, and DFT were employed to explain the high peroxidase activity. As a proof of concept, the DA-PPI nanozyme could effectively inhibit E. coli (G−) and S. aureus (G+) due to its high peroxidase-like activity. The study provides a new idea for the design of high active nanozymes and their application in the field of antibacterial.
研究领域:
生物化学
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材料科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
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2017
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IF 4.95
Gang-Wei Wu,Yi-Min Shen,Xiao-Qiong Shi,Hao-Hua Deng,Xiao-Qing Zheng,Hua-Ping Peng,Ai-Lin Liu,Xing-Hua Xia,Wei Chen
In this work, bimetallic Bi/Pt nanoparticles in bovine serum albumin biomolecular scaffold (BSA-Bi/PtNPs) were synthesized through a facile and green method. As compared with BSA-PtNPs, the BSA-Bi/PtNPs possess enhanced peroxidase-like catalytic activity . Moreover, the BSA-Bi/PtNPs are stable in harsh conditions such as high temperature, extreme pH environments, and high ionic strength , as well as in common biological matrixes. These prominent advantages enable the BSA-Bi/PtNPs to be applied to a wide range of fields. Bioassays, such as serum glucose detection, extracellular hydrogen peroxide (H 2 O 2 ) monitor, and cancer cells labeling, have been realized with satisfying results. The linear range of glucose determination was from 1 to 100 μM and the limit of detection (LOD) was 0.2 μM. The H 2 O 2 released from each MCF-7 cell after stimulation was calculated to be 2.66 × 10 −16 mol/s. By utilizing folic acid as a recognition element, tumor cell could be readily distinguished by BSA-Bi/PtNPs and the LOD for MCF-7 cell detection was 90 cells.
研究领域:
生物化学
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纳米医学
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分析化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Bo Li,Lipan Luo,Yujia Liu,Xiaohan Zhou,Yuyu Zhang,Lishuai Song,Nan Liu,Qing Tang,Zequan Li
Pt/TiO2 photocatalysts were synthesized using incipient wetness impregnation followed by oxidative and/or reductive thermal treatments. The loading dimensions of Pt elements on the TiO2 surface (PtP, PtSA, and PtC) were controlled by varying the impregnated solution. Experimental results demonstrate that PtC with intermediate size exhibits the highest photolysis rate under 300W xenon lamp irradiation, achieving a hydrogen yield of 11.42 mmol g^-1 h^-1 and an apparent quantum yield of 40.65%. Similarly, Ru/TiO2 and Ir/TiO2 photocatalysts prepared under the same conditions exhibited the same pattern. Photoelectrochemical tests reveal that PtC/TiO2 has the narrowest band gap, the highest interfacial charge transfer capacity, and the greatest carrier separation efficiency. DFT calculations indicate that PtC/TiO2 has the most suitable d-band center, resulting in a close-to-zero ΔGH* value of 0.05 eV. This optimal value significantly balances the adsorption and desorption of hydrogen intermediates (H*) during the photocatalytic hydrogen evolution (PHE) reaction. This study provides new insights into the preparation of precious metal-loaded photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Baocheng Qiu,Yakun Zhang,Yi Liu,Yi Zhang
The efficient conversion of ethane has become more attractive recently because of the shale gas revolution. Platinum-based catalyst is the most active for direct dehydrogenation of ethane to ethylene, but it always suffers deactivation due to coke deposition and sintering of supported Pt. We have successfully synthesized a Pt-embedded inside HZSM-5 crystal catalyst (Pt@HZSM-5) by hydrothermal synthesis using Pt/SiO 2 as only silicone source, to realize excellent stability during the dehydrogenation of ethane (EDH) to ethylene. Based on various characterization results, including in-situ synchrotron XANES and EXAFS, in situ XPS, operando DRIFTS, as well as 27 Al MAS NMR, the stable Pt species with high electron density on Pt@HZSM-5 avoids the deep dehydrogenation of ethane to form coke, and the surrounding environment of Pt active phase, including newly formed HZSM-5 frameworks and its acidity, contributes to suppressing the aromatization of the formed ethylene. As synergic effects, the Pt@HZSM-5 catalyst realizes excellent stability during 50 h EDH reaction without any regenerations with relatively high ethane conversion under the serve reaction conditions (90% ethane in feed gas, 0.1 MPa, 550 °C). However, the conventional Pt/HZSM-5 catalyst exhibits dynamic transformation of Pt chemical state, particle size, and its surrounding environment, resulting in rapid deactivation induced by much more carbon deposition and aromatization of the formed ethylene.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yingzhang Shi,Taikang Wu,Zhiwen Wang,Cheng Liu,Jinhong Bi,Ling Wu
Optimizing the electronic structure of the surface active sites and introducing functional sites for a photocatalyst are effective strategies to achieve the photocatalytic selective hydrogenation of biomass. Herein, Pt clusters/bimetallic NiMg-MOF-74 (MNM) ultrathin nanosheets were constructed for the photocatalytic precise hydrogenation of furfural (FUR) to furfuryl alcohol (FAL). A representative sample (Pt/MNM-0.25) shows 99.9% conversion of FUR and 99.9% selectivity of FAL. The electron density of surface coordinatively unsaturated Ni II atoms in MNM is decreased after the doping of Mg. In situ ATR-IR indicated that the optimized surface Ni II sites induced a more effective coordination activation of FUR molecules via the Ni-η 1 -(O)-furfural coordination. Electrochemical measurements and in situ EPR results reveal that Pt clusters are the functional surface sites for transferring the photogenerated electrons and dissociating H 2 . The synergistic effect of surface optimized Ni II sites and Pt clusters is emphasized. This work successfully achieves the high-efficiency precise hydrogenation of FUR to FAL via designing surface functionalized Pt clusters/bimetallic MOF ultrathin nanosheets.
研究领域:
催化
·
材料科学
·
化学工程
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Haiwen Xu,Danyang Li,Lei Jiang,Chunqiang Lu,Jiangyong Yuan,Zhiqiang Li,Yuelun Li,Huicong Zuo,Kongzhai Li
It is challenging to load precious metals nanoparticles on LaFeO 3 perovskite with small specific surface, and to improve the thermal stability of precious metals is also very difficult. Therefore, it is of great significance to disperse precious uniformly on perovskite with low specific surface area and to make the catalyst with high catalytic activity and thermal stability. In this work, we develop series of perovskite-based methane combustion catalysts with good catalytic activity and stability. Compare with traditional LaFeO 3 catalysts, the catalytic activity of three-dimensional ordered macroporous (3DOM) LaFeO 3 significantly improves by loading Pt. In addition, its thermal stability is significantly improved by adding CeO 2 , especially at high roasting temperature (800 °C). The 1 wt%Pt/10 %CeO 2 /3DOM LaFeO 3 catalysts shows the highest catalytic activity in which the T 10 , T 50 and T 90 are 362 °C, 433 °C and 502 °C, and its recaction temperature of T 50 is decreased by 50 °C compare with Pt/3DOM LaFeO 3 (8 0 0). The different physical and chemical characterizations suggest that the coupling of Ce 3+ and Fe 2+ induces the formation of a large number of oxygen vacancies, which promotes the oxygen mobility and th oxygen storage capacity during the methane oxidation process. More importantly, the CeO 2 addition contributes to the Pt-CeO 2 interaction with Ce-O-Pt bond formation, which greatly improves the thermal stability of the catalyst, and this Pt-CeO 2 interaction strength becomes more obvious with the increase of calcination temperature. Furthermore, the in-situ DRIFT experiments indicate that M−K mechanism is probably involved in the reaction process.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）