Catalysts
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2016
·Vol. 6
·期 10
·150
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IF 2.964
Gaixiu Yang,Yongming Sun,Pengmei Lv,Feng Zhen,Xinyue Cao,Xiaojie Chen,Zhongming Wang,Zhenhong Yuan,Xiaoying Kong
Carbon-supported Pt–Ru alloys with a Pt/Ru ratio of 1:1 were prepared by NaBH4reduction at room temperature. X-ray diffraction (XRD) measurements indicate that the as-prepared Pt–Ru nanoparticles had a face-centered cubic (fcc) structure. X-ray photoelectron spectroscopy (XPS) analyses demonstrate that alloying with Ru can decrease the 4f electron density of Pt, which results in a positive binding energy shift of 0.2 eV for the Pt 4f peaks. The catalytic properties of the synthesized Pt–Ru alloy catalysts were compared with those of commercial Pt/C catalysts by linear sweep voltammetry (LSV). The results show that the mass activity of the oxygen reduction reaction (ORR) is enhanced by 2.3 times as much mass activity of Pt relative to the commercial Pt/C catalyst. Single-chambered microbial fuel cell tests also confirm that the Pt–Ru alloys as cathode catalysts have better performance than that of commercial Pt/C catalysts.Keywords:Pt–Ru nanoparticles;oxygen reduction reaction;electrocatalyst;microbial fuel cell
研究领域:
环境科学
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
·
IF 9.224
Zhuo Li,Yaqian He,Chunhui Li,Yuchu He,Xuwu Zhang,Song Ni,Desong Wang,Dawei Gao
The high interstitial fluid pressure at the tumor tissue is a key factor that hinders the deep penetration of nanomedicines into the tumor and affects the therapeutic effect. Herein, we designed a CaO2-based Ru nanozyme to efficiently consume the tumor interstitial fluid and enhance deep tumor penetration as well as treatment. CaO2/Ru-PDA-HA (CRPH) reached tumors via hyaluronic acid (HA)-mediated tumor targeting. Under 808 nm laser irradiation, CRPH pyrolyzed and released CaO2 and Ru, and then CaO2 would consume H2O to produce O2 and H2O2 for reducing the tumor interstitial fluid volume to promote the tumor penetration of medicines. Meanwhile, Ru nanoparticles with good peroxidase activity can decompose H2O2 to generate cytotoxic •OH. Therefore, photothermal and ROS synergistic therapy damaged deep tumor stem cells. The results showed that the relative tumor interstitial pressure was reduced to 56.34%, and the tumor inhibition rate was 99.67%. The design provides a synergetic hydrodynamic therapy strategy for enhancing the deep penetration of nanomedicines and boosting the antitumor effect.
研究领域:
肿瘤学
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纳米医学
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生物材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
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2024
·
IF 6.5
Xiaoqing Gao,Shanhui Zhu,Mei Dong,Hongyan Zheng,Yanfeng Xue,Xiaojing Cui,Yulan Niu,Weibin Fan
Highly efficient synthesis of valuable γ-valerolactone (GVL) by levulinic acid (LA) hydrogenation is of interest for biomass refinery, but it suffers from great challenge to design highly active Ru-based catalyst at low temperature. ZIF-8 derived ZnO@NC nanocomposite can firmly anchor Ru nanoparticles to create strong Ru-ZnO interfacial structure, as revealed by characterization techniques and DFT calculations. By optimizing Ru content and ZnO particle size, Ru/ZnO@NC achieved excellent reaction activity with a turnover frequency (TOF) of 6032 h −1 at low temperature of 40 °C, which is never reported before. After etching the accessible ZnO, the TOF value was significantly declined to 125 h −1 on Ru/ZnO@NC-HF owing to the lack of effective Ru-ZnO interface. DFT calculation results demonstrate that the Ru-ZnO interfacial structure can facilitate the activation of intermediate CH 3 CHOCH 2 CH 2 COOH* and remarkably decline the activation energy barrier of rate-determining step (CH 3 CHOCH 2 CH 2 COOH + H = HPA) from 1.28 eV to 0.82 eV, thus leading to excellent activity of LA hydrogenation at low temperature.
研究领域:
催化化学
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生物质能
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2024
·
IF 3.4
Rui Song,Chang Yao,Wenhua Li,Nihong An,Yafeng Shen,Nina Fei,Xiaohu Ge,Yueqiang Cao,Xuezhi Duan,Xing-Gui Zhou
Hydrogenations achieved on supported metal catalysts are normally structure sensitive, and comprehensive understandings on such sensitivity are pivotal for gaining insights into the active sites as well as the design of catalysts. Herein, a serials of differently sized Ru nanoparticles supported on carbon nanotube (CNT) were prepared and employed as catalysts for L-alanine hydrogenation to examine the structure sensitivity of amino acid hydrogenation. The reaction rates for L-alanine conversion and the formation of alaninol are demonstrated to be strongly dependent on the sizes of Ru nanoparticles, highlighting the structure sensitivity of the L-alanine hydrogenation. The activation energies extracted from kinetics studies are insensitive to the sizes of Ru nanoparticles on the Ru catalysts sized ≥1.3 nm with similar electronic properties, pointing to a predominant type of active site for L-alanine hydrogenation. By further combining model calculations with the shape of Ru nanoparticles determined by transmission electron microscopy, the Ru(101) sites are identified as the dominant active sites for L-alanine conversion and alaninol formation, which is further rationalized by density functional theory calculations. The kinetics insights into such structure sensitivity are believed to be important for the design and optimization of catalysts for the reaction.
研究领域:
催化
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物理化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Fang-Ze Han,Yu-Fei Wan,Cheng-Xin Li,Shan-Lin Zhang
The development of solid-oxide cells requires fuel electrodes capable of promoting highly catalytic activities for CO 2 electrochemical reduction (CO 2 R). This study develops a fuel electrode material, Sr(Ti 0·3 Fe 0·63 Ru 0.07 ) O 3-δ (STFR) perovskite, enhance with in-situ exsolved Fe–Ru nanoparticles (STFR–FeRu), demonstrating excellent electrochemical catalytic activity for CO 2 R, considerable stability, and high selectivity for CO 2 electrolysis. Notably, the study discovered for the first time that STFR–FeRu exhibits significantly enhanced catalytic activity in a CO 2 -containing atmosphere compares to that in hydrogen-based fuels. At 800 °C and 1.3 V, La 0·8 Sr 0.2 Ga 0.8 Mg 0·2 O 3-δ electrolyte-supported cells with STFR–FeRu fuel electrode, for direct CO 2 electrolysis, realizes a current density of 1.77 A cm −2 . This current density is 50 % higher than that of H 2 O electrolysis under the same conditions. Additionally, the cell achieves a current density of 1.54 A cm −2 for CO 2 –H 2 O co-electrolysis, with a high CO 2 electrolysis selectivity (CO concentration exceeding 60 % in the electrolysis products).
研究领域:
材料科学
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电化学
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能源材料
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催化
✓ 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）