Materials Reports: Energy
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2023
·
IF 0
Zhenmin Zhang,Dezhang Ren,Dian Zhang,Tiantian Hu,Congyuan Zeng,Nengneng Xu,Zhibao Huo,Jinli Qiao
The deoxygenation of organic acids, important biomass feedstocks and derivatives, to synthesize hydrocarbon products under mild electrochemical conditions, holds significant importance for the production of carbon-neutral biofuels. There is still limited research on the influential factors of the electrochemical decarboxylation reaction of medium-chain fatty acids. In this study, n -octanoic acid (OA) was chosen as the research subject to investigate the electrochemical decarboxylation behavior of OA on a platinum electrode, focusing on the influence of different alkali metal cations (Li + , Na + , K + ), common anions (SO 4 2− , Cl − ), and electrolyte pH. It was found that KOH as an electrolyte exhibited the best performance for OA. Possibly, the larger size of K + increased the alkalinity of the electrode surface, facilitating OA deprotonation. LiOH electrolyte reduced the solubility of OA, thereby inhibiting the decarboxylation reaction. SO 4 2− exhibited a weak promoting effect on the decarboxylation reaction of OA, while Cl − showed no adverse effect although Cl − may adsorb on the electrode surface. Furthermore, unlike short-chain fatty acids, medium-chain OA can only achieve efficient decarboxylation under alkaline conditions due to its solubility properties. This study provides references and foundations for future efforts to enhance the efficiency of electrochemical decarboxylation synthesis of hydrocarbon biofuels from medium-chain fatty acids.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Hongtao Zou,Shiliang Zhang,Xiaoling Hong,Qilu Yao,Yan Luo,Zhang-Hui Lu
As an ideal hydrogen supplier in liquid phase, hydrous hydrazine has gained a lot of attention for safe and efficient storage as well as transportation of hydrogen. Herein, a low Pt-containing Ni–Pt bimetallic catalyst immobilized on novel MIL-101/rGO composite has been prepared by a facile impregnation-reduction approach. Unexpectedly, the resultant Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst exhibits optimal catalytic performance and 100% H 2 selectivity for hydrogen evolution from hydrous hydrazine under alkaline conditions at 323 K, giving a turnover frequency (TOF) value of 960.0 h −1 , which is a relatively higher value ever reported heterogeneous catalysts. Even at room temperature, Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst shows excellent catalytic activity for dehydrogenation of hydrazine as well as hydrazine borane. In addition, the Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst also exhibits excellent durability. Even after eight recycles, the catalytic activity is no significant decrease, and the H 2 selectivity still remains 100%.
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高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 19
·4934-4944
·
IF 5.365
Jinghua Liu,Tong Ding,Hao Zhang,Guangcheng Li,Jinmeng Cai,Dongyue Zhao,Ye Tian,Hui Xian,Xueqin Bai,Xingang Li
Herein, we report the high performance of thermally reduced Pt/TiO2(B) catalysts for the catalytic oxidation of CO. Our findings show that through hydrogen spillover from Pt to TiO2, surface-engineered defects of oxygen vacancies are “constructed” on the TiO2 support during the reduction process, thus generating active surface-adsorbed oxygen species. With an increase of the reduction temperature, the TiO2(B) phase gradually transforms to the anatase phase, which takes place from the bulk to the surface of TiO2, and is eventually completed at 700 °C. Compared with the anatase phase, the oxygen vacancies are more easily formed on the TiO2(B) phase, and the latter has much stronger interactions with Pt, as well. As the reduction temperature increases, the metal–support interaction between Pt and TiO2(B) is strengthened. Meanwhile, we simultaneously observe an increase in the dispersion of Pt, the proportion of Pt0 and the adsorbed oxygen species on the surface. Our findings reveal that for thermally reduced Pt/TiO2 catalysts, surface-adsorbed oxygen and Pt0 are active species for the catalytic oxidation of CO. Among the thermally reduced catalysts, H-600 shows the highest catalytic activity because it has the largest amount of active Pt0 sites and surface-adsorbed oxygen species. In addition, it shows high water vapor resistance.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Junbo Feng,Junyan Wu,Dongdong Yan,Yadong Zhang
Porous silica nano-flowers (KCC-1) immobilized Pt-Pd alloy NPs (Pt-Pd/KCC-1) with different mass ratios of Pd and Pt were successfully prepared by a facile in situ one-step reduction, using hydrazinium hydroxide as a reducing agent. The as-synthesized silica nanospheres possess radial fibers with a distance of 15nm, exhibiting a high specific surface area (443.56 m 2 ·g –1 ). Meanwhile, the obtained Pt-Pd alloy NPs are uniformly dispersed on the silica surface with a metallic particle size of 4–6 nm, which exist as metallic Pd and Pt on the surface of monodisperse KCC-1, showing the transfer of electrons from Pd to Pt. The as-synthesized 2.5%Pt-2.5%Pd/KCC-1 exhibited excellent catalytic activity and stability for the continuous dehydrogenation of 2-methoxycyclohexanol to prepare guaiacol. Compared with Pt or Pd single metal supported catalysts, the obtained 2.5%Pt-2.5%Pd/KCC-1 shows 97.2% conversion rate of 2-methoxycyclohexanol and 76.8% selectivity for guaiacol, which attributed to the significant synergistic effect of bimetallic Pt-Pd alloy NPs. Furthermore, turn over frequency value of the obtained 2.5%Pt-2.5%Pd/KCC-1 NPs achieved 4.36 s –1 , showing higher catalytic efficiency than other two monometallic catalysts. Reaction pathways of dehydro-aromatization of 2-methoxycyclohexanol over the obtained catalyst are proposed. Consequently, the obtained 2.5%Pt-2.5%Pd/KCC-1 NPs prove their potential in the dehydrogenation of 2-methoxycyclohexanol, while the kinetics and mechanistic study of the dehydrogenation reaction over the catalyst in a continuous fixed-bed reactor may provide valuable information for the development of green, outstanding and powerful synthetic pathway of guaiacol.
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高影响因子
Frontiers in Energy
·
2025
·
IF 6.2
Tang Wenbin,Xia Shuyue,Chou Haiwen,Zhao Jianan,Zhou Yi,Huang Qinghong,Yu Nengfei,Wu Yuping
The oxygen reduction reaction (ORR) plays a crucial role in key processes of fuel cells and zinc-air batteries. To enable commercialization, reducing the platinum (Pt) content and increasing the specific activity per unit mass is essential. A promising approach involves synthesizing of Fe-N-C precursors via the polyaniline (PANI) pathway, which ensures a uniform distribution of Fe-N-C species and facilitates the subsequent adsorption of platinum ions. This leads to the formation of Pt-Fe bimetallic alloys. The synergistic interaction between Pt and Fe-N-C sites promotes the homogeneous dispersion of Pt and the formation of smaller particle sizes, which in turn enhances intrinsic activity and stability of the catalyst. Notably, the Pt/Fe-N-C catalyst, featuring an ultra-low Pt loading of just 1.79 wt%, exhibits a remarkable doubling of mass activity compared to conventional catalysts. Moreover, zinc-air batteries using this catalyst achieve an impressive peak power density of 200 mW/cm 2 .
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高影响因子
Advanced Science
·
2020
·Vol. 7
·期 17
·1903341
·
IF 15.84
Qing You,Kaiyue Zhang,Jingyi Liu,Changliang Liu,Huayi Wang,Mengting Wang,Siyuan Ye,Houqian Gao,Letian Lv,Chen Wang,Ling Zhu,Yanlian Yang
Multifunctional nanoplatforms for imaging-guided synergistic antitumor treatment are highly desirable in biomedical applications. However, anticancer treatment is largely affected by the pre-existing hypoxic tumor microenvironment (TME), which not only causes the resistance of the tumors to photodynamic therapy (PDT), but also promotes tumorigenesis and tumor progression. Here, a continuous O 2 self-enriched nanoplatform is constructed for multimodal imaging-guided synergistic phototherapy based on octahedral gold nanoshells (GNSs), which are constructed by a more facile and straightforward one-step method using platinum (Pt) nanozyme-decorated metal–organic frameworks (MOF) as the inner template. The Pt-decorated MOF@GNSs (PtMGs) are further functionalized with human serum albumin-chelated gadolinium (HSA-Gd, HGd) and loaded with indocyanine green (ICG) (ICG-PtMGs@HGd) to achieve a synergistic PDT/PTT effect and fluorescence (FL)/multispectral optoacoustic tomography (MSOT)/X-ray computed tomography (CT)/magnetic resonance (MR) imaging. The Pt-decorated nanoplatform endows remarkable catalase-like behavior and facilitates the continuous decomposition of the endogenous H 2 O 2 into O 2 to enhance the PDT effect under hypoxic TME. HSA modification enhances the biocompatibility and tumor-targeting ability of the nanocomposites. This TME-responsive and O 2 self-supplement nanoparticle holds great potential as a multifunctional theranostic nanoplatform for the multimodal imaging-guided synergistic phototherapy of solid tumors.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·Vol. 13
·期 36
·30311-30323
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IF 9.5
Yan Zhu,Guicheng Jiang,Shengpeng Han,Ran Lei,Piqi Song,Yingchun Liu,Shan-Tao Zhang,Danqing Liu,Bin Yang,Wenwu Cao
Lead-based relaxor ferroelectric materials are extensively utilized in various fields such as ultrasonic transducers, sensors, high-precision displacement control, and underwater acoustic detection, owing to their exceptional electrical properties. Nevertheless, the application of lead-based relaxor ferroelectric ceramics in high-end ultrasonic transducers is constrained by their suboptimal electromechanical coupling properties and inadequate overall piezoelectric performance. Here, by employing the strategy of “collaborative design of local structural heterogeneity and texturing”, excellent comprehensive electromechanical properties (d33 = 1310 pC N−1, k33 = 0.87, and TC = 170 °C) were achieved by introducing rare earth Eu3+ ions into [001]PC-textured Pb(Mg1/3Nb2/3)O3–PbZrO3–PbTiO3 (PMN-PZ-PT) ceramics. Their d33 is about 5.5 times that of ordinary ceramic materials without rare earth ion doping. Furthermore, the examination of PFM and relaxor properties reveals that improving relaxor properties in ceramics increases the formation of nano-scale domains, which is directly responsible for their exceptional piezoelectric and electromechanical properties. Nano-scale domain structures are formed as a result of local structural heterogeneity caused by rare earth ion doping and the stress induced elastic field in the texture process. This research will be essential for the continued development and application of high-performance ferroelectric ceramic materials in devices.
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CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Jingsong Liu,Songyao Wu,Zhe Dong,Meizi Yang,Fengyuan Zhang,Guowei Li,Hangyu Yan,Mengdai Luoshan
Multicomponent heterojunctions have attracted considerable attention for the potential applications in photodriving applications. However, the limited number of active sites on the surface and the rapid recombination of photogenerated carriers restrict the improvement of the performance of photothermal conversion and photocatalytic degradation. Here, a ternary nanohybrid composed of PbS, Pt, and TiO2 is presented for the first time. PbS nanocrystals evolved from octahedral to a unique 24-faceted morphology were monitored and described systematically. Then, they were selectively deposited by Pt nanoparticles and coated with a TiO2 thin nanoshell. Under 808 nm near-infrared laser irradiation, the photothermal conversion performance and photocatalytic reduction rates of these nanohybrids were investigated in depth. Among them, the PbS-Pt-TiO2 nanohybrids exhibited the highest photothermal conversion efficiency and fastest degradation speed of Rhodamine B when compared to PbS-Pt and pure PbS, which are attributed to the effective light absorption of 24-faceted PbS nanocrystals and the outer TiO2 shell, the abundant catalytic active sites provided by Pt nanoparticles, and the excellent separation and transportation efficiency of hot carriers between different components.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Shiyue Ren,Yingnan Duan,Zhimin Feng,Haitao Yuan,Lihong Hu,Jiao Wang,Weizun Li,Zhurui Shen
Photocatalytic CO 2 reduction is a promising approach to close the carbon cycle by converting CO 2 into high-value chemicals and fuels, but its practical advancement is hindered by key challenges in photocatalyst design. Though oxygen vacancies (O V ) engineering and noble metal co-catalysts can enhance performance via synergistic strong metal-support interactions (SMSI), their use is limited by harsh synthesis conditions and noble metal cost. Herein, we integrated Pt nanoparticle (Pt NPs )-loaded mixed-phase TiO 2 (anatase/rutile) with abundant O V via a facile two-step method. The as-prepared Pt/A2-TiO 2-x exhibited CH 4 and CO production rates of 72.31 and 55.45 μmol·g⁻¹·h⁻¹ in pure H 2 O, representing 5.6- and 9-fold enhancements over pristine TiO 2 . Characterizations, theoretical calculations, and in-situ Fourier transform infrared spectroscopy confirmed that O V facilitated robust Pt-TiO 2 SMSI, which promoted bulk photogenerated electron migration to Pt surfaces and accelerated CO 2 adsorption/activation, thereby optimizing the CO 2 -to-CH 4 reaction pathway. This work deepens understanding of metal-vacancy synergy and provides a rational strategy for designing cost-effective, high-performance photocatalysts for CO 2 reduction.
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高影响因子
FUEL
·
2025
·
IF 7.5
Fan Shao,Fengzhi Guo,Tianyu Bai,Zhen Xu,Han Yang,Wenbo Kang,Yasong Zhou,Wenbin Huang,Gang Wang,Qiang Wei
The inherent diffusion constraints imposed by narrow micropores and elongated channels in Y zeolites severely limit jet fuel selectivity during Fischer-Tropsch wax hydrocracking. Advanced supports were synthesized via seed-directed crystallization (nano-Y-0P zeolite) and PDDA (polydiallydimethyl ammonium chloride)-mediated assembly (hierarchical nano-Y-xP zeolites, x = 0.1, 0.3, 0.6, 0.9). This dual-strategy synergistically addresses diffusion constraints in conventional Y-zeolite by optimizing nano structure of active sites and improving interfacial mass transfer (i.e., nano-crystal size and hierarchical porosity). Intelligent Gravimetric Analysis (IGA) directly validates hierarchical porosity and nanocrystalline advantages. Y-0.6P zeolite with optimal mesoporosity (0.75 cm 3 /g vs. 0.25 cm 3 /g in conventional Y-zeolite) and minimal crystallite size (131 nm vs. 1258 nm in conventional Y-zeolite) achieves intrinsic diffusion enhancement—the 5.36-fold higher diffusion rate than conventional S-Y zeolite. Zeolite crystallite size and hierarchical porosity critically govern metal–acid functionality balance by modulating acid site density (589.7 μmol/g vs. 812.4 μmol/g in conventional Y zeolite) and optimizing metal dispersion (40.5 %, vs. 18.26 % in conventional Y-zeolite). Pt/(Y-0.6P+ASA) catalyst achieves peak performance with 35.04 % C 9 –C 17 yield and 47.35 % selectivity in n-docosane hydrocracking. Notably, Fischer-Tropsch wax hydrocracking yields 26.83 % jet fuel (49.88 % selectivity) with ideal bell-shaped distribution. This work demonstrates Y-0.6P-supported catalyst has industrial potential for aviation fuel production from Fischer-Tropsch wax upgrading.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Bowen Yang,Yangyang Long,Feng Chen,Jiabao Wang,Zhipeng Wang,Ziqiang Zhang,Yanfei Wang,Weihua Zou,Yeguang Zhang,Peng Wang,Zili Zhan,Feihu Li
Hydrogen sensor based on proton exchange membrane fuel cells (PEMFCs) was one of the most extensively studied types. However, traditional Pt/C based electrodes suffered from several drawbacks, including high cost, low catalytic efficiency for oxygen reduction reaction (ORR) and slow reaction kinetics. Herein, we developed a quasi PEMFCs hydrogen sensor utilizing MnO 2 as cathode catalyst, where the electrochemical signal was generated via the direct MnO 2 redox reaction with hydrogen, replacing the ORR process. Membrane electrode assemblies (MEAs) were successfully fabricated incorporating α-MnO 2 , β-MnO 2 , and δ-MnO 2 polymorphs. The β-MnO 2 -based sensor demonstrated best sensing performance with a maximum sensitivity of 96 nA/ppm, a 34-fold enhancement over conventional dual-platinum electrochemical sensors, under the optimized volume ratio of catalyst ink (ethylene glycol: Nafion solution: water = 1:4:4). Moreover, the β-MnO 2 -based sensor exhibited significantly superior response and recovery speed. This strategy provided an effective approach for the commercialization of next generation PEMFCs-type hydrogen sensors.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yunmao Zhang,Yong Liu,Weihua Liu,Xiying Li,Liqun Mao
This paper reports the convenient synthesis of honeycomb-like mesoporous nitrogen-doped carbon spheres (MNCS) using a self-assembly strategy that employs dopamine (DA) as a carbon and nitrogen precursor and a polystyrene- b -poly(ethylene oxide) (PS 173 - b -PEO 170 ) diblock copolymer as a soft template. The MNCS have large BET surface areas of up to 554 m 2 g −1 and high nitrogen contents of up to 6.9 wt%. The obtained MNCS are used as a support for Pt catalysts, which promote methanol oxidation in alkaline media. The MNCS-supported Pt (Pt/MNCS) catalyst has a larger electrochemically active surface area (ESA) (89.2 m 2 g −1 ) than does a commercially available Vulcan XC-72R supported Pt/C catalyst. Compared to the Pt/C catalyst, Pt/MNCS displays a higher peak current density (1007 mA mg −1 ) and is more stable during methanol oxidation. These improvements are attributed to the honeycomb-like porous structure of the MNCS and the introduction of nitrogen to the carbon support. The MNCS effectively stabilize Pt nanoparticles and assuage the agglomeration of the nanoparticles, suggesting that MNCS are potential and promising application as electrocatalyst supports in alkaline direct methanol fuel cells.
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高影响因子
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