JOURNAL OF CATALYSIS
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2024
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IF 6.5
Hang Li,Kaisheng Yao,Tianhang Liu,Tianhang Han,Qi Wang,Aozhou Wang,Weiwei Lu
Bimetallic AuPd plasmonic photocatalyst is a promising candidate for catalyzing selective oxidation of aromatic alcohol. However, developing a simple one-step method for the preparation of free-standing AuPd nanostructures with excellent photocatalytic performance remains a huge challenge. Here, a facile liquid–liquid interface route was exploited to one-pot prepare free-standing AuPd alloy nanowires (NWs) under mild conditions. Specifically, Au 1 Pd 1 NWs are grown via oriented attachment at chloroform-water interface and 40 °C with Na 2 PdCl 4 and HAuCl 4 as precursors and 1-naphthol as reductant. Au 1 Pd 1 NWs possess many advantages, such as thin diameter (4.0 nm), large aspect ratio, abundant defects and strong Au-Pd electronic interaction. During benzyl alcohol oxidation to benzaldehyde, Au 1 Pd 1 NWs exhibit excellent photocatalytic activity and durability. At 40 min of visible light illumination, 98 % conversion of benzyl alcohol and 100 % selectivity to benzaldehyde are finished. After five cycles, Au 1 Pd 1 NWs still maintain high photocatalytic activity. Compared to pure Au NWs, alloying Pd with Au in Au 1 Pd 1 NWs dramatically enhances photocatalytic activity. The results indicate that the generated abundant •O 2 – under illumination play an important role in significantly improving benzyl alcohol oxidation to benzaldehyde.
研究领域:
材料科学
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催化化学
·
纳米技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Ruigang Xie,Lingli Zhou,Daixiang Chen,Shenghu Yan,Nianbing Su,Yue Zhang
Palladium (Pd)-based catalysts have been extensively investigated in direct ethanol fuel cells (DEFCs) since the urgent energy and environmental problems. Rational design Pd-based catalyst with outstanding structure can optimize its electrocatalytic performance for ethanol oxidation reaction (EOR) catalyst. In this work, a facile strategy was proposed to prepare AuPd nanochain networks (NNWs) with core-shell structure by adjusting the reduction rate by slowly dropping the acidic reducing agent to the alkaline precursor solution system. The resulting catalysts exhibit a porous self-supporting structure with twisted features, exposing a large number of active sites. The optimized AuPd NNWs catalyst displays much-improved activity (3289.62 mA mg − 1 Pd) and greatly enhanced electrocatalytic stability for EOR in comparison with that of commercial Pd/C catalysts. This enhanced activity can be attributed to the synergic effect of the Pd shell with the Au core as well as the twisted and self-supporting structure which can expose much more active sites and provide rich mass and electron transfer channels.
研究领域:
材料科学
·
能源与环境科学
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产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 12
·期 3
·2126-2132
·
IF 6.97
Hui Xu,Hongyuan Shang,Cheng Wang,Liujun Jin,Chunyan Chen,Yukou Du
Although great successes have been accomplished on the controlled synthesis of 2D and 3D Pd-containing nanomaterials, tapping into the novel Pd-containing electrocatalysts that combined the advantages of both 2D and 3D structures remains a significant challenge. Here, an approach to systematically produce porous Fe-doped Pd nanosheet assemblies (NSAs) with a geometry tuning from PdFe hollow nanospheres (HNSs), PdFe nanocages (NCs), to PdFe nanoplates (NPs) is reported. The inherent ultrathin and porous features endow these PdFe catalysts with excellent electrocatalytic performance. As a result, the optimized 3D PdFe NCs show a much-improved methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) activities in comparison with PdFe HNSs, Pd NPs, and commercial Pd/C catalysts. Moreover, these PdFe nanocatalysts also display greatly enhanced electrocatalytic stability, which can endure 500 cycles with negligible activity loss and structural changes. The mechanism investigations reveal that the introduced Fe atom efficiently modulates the electronic structure of Pd, leading to the downshift of the d-band center of Pd, which is beneficial for the adsorption of reactants. Moreover, the porous nanosheet assembly structure can provide rich mass and electron transfer channels, further boosting the improvement of electrocatalytic performance.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
·
2016
·
IF 9.307
Da Lei,Kai Yu,Meng-Ru Li,Yuling Wang,Qi Wang,Tong Liu,Pengkun Liu,Lan-Lan Lou,Guichang Wang,Shuangxi Liu
Single-crystalline Pd nanocrystals enclosed by {111} or {100} facets with controllable sizes were synthesized and originally employed as catalysts in the aerobic oxidation of 5-hydroxymethyl-2-furfural (HMF). The experimental results indicated that the particle size and exposed facet of Pd nanocrystals could obviously influence their catalytic performance. The size-dependent effect of Pd nanocrystals in this reaction could only be derived from the different Pd dispersions. Therefore, the facet effect of Pd nanocrystals was first investigated in this work through experimental and theoretical approaches. It was found that Pd-NOs enclosed by {111} facets were more efficient than Pd-NCs enclosed by {100} facets for the aerobic oxidation of HMF, especially for the oxidation step from 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) toward 5-formyl-2-furancarboxylic acid (FFCA). The TOF value of Pd-NOs(6 nm) was 2.6 times as high as that of Pd-NCs(7 nm) and 5.2 times higher than that of commercial Pd/C catalyst for HMF oxidation. Through density functional theory (DFT) calculations, the notably enhanced catalytic performance of Pd-NOs could be mainly attributed to the lower energy barrier in the alcohol oxidation step (from HMFCA to FFCA) and higher selectivity for O2 hydrogenation to produce peroxide.
研究领域:
催化化学
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材料科学
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理论计算化学
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产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 5
·3469-3481
·
IF 6.895
Longfei Guo,Fuyi Chen,Tao Jin,Huazhen Liu,Nan Zhang,Yachao Jin,Qiao Wang,Quan Tang,Bowei Pan
Formate is a kind of carbon-neutral fuel that can be synthesized by electrochemical conversion of CO2, however, the generated aqueous formate electrolyte is still short of potential application. Here, formate solution is proposed to be utilized as anode fuels of direct formate fuel cells through the formate oxidation reaction (FOR), and graphene supported AgPd nanoalloys (AgPd/rGO) are prepared to catalyze the FOR. Specifically, the mass activity of the as-prepared Ag49Pd51/rGO catalyst is 4.21 A mg−1Pd and the retention activity of Ag49Pd51/rGO is 49.1% of initial activity after successive 500 cycles, which is 2.48 and 3.03 times higher than that of unsupported Ag51Pd49 nanoalloys. When increasing the positive scan limit from 0.0 to 0.8 V, the mass activity of the Ag49Pd51/rGO catalyst increases from 2.32 to 6.03 A mg−1Pd and Pd surface coverage increases from 51.87% to 62.42%, indicating the occurrence of surface reconstruction where Pd atoms migrate to the surface of AgPd nanoalloys, and less intensive reconstruction is observed in unsupported Ag51Pd49 nanoalloys, whose mass activity increases from 1.35 to 2.49 A mg−1Pd. The driving force and kinetic path are calculated for the surface reconstruction induced by the adsorption of H, O and C atoms, in the case of C atoms on graphene, the segregation energy of surface Pd atoms in the AgPd nanoalloy is −1.16 eV, and the activation energy for the migration of subsurface Pd atoms to the surface is 0.54 eV, which are lower than the segregation (0.03 eV) and activation (2.06 eV) energy on a clean alloy surface.
研究领域:
材料科学
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电化学
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 51
·41017-41024
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IF 3.84
Sha Lin,Yuxia Hou,Xiao Deng,Haoliang Wang,Shuzhuang Sun,Xiaomei Zhang
A triazine-based covalent organic framework (COF-SDU1) was synthesized through facile solvothermal conditions and characterized by IR, solid state 13C NMR, XRD, elemental analysis and BET. By a simple solution infiltration method, Pd(II) species were successfully immobilized into COF-SDU1 due to its two-dimensional eclipsed layer-sheet structure and nitrogen-rich content. High-resolution TEM images showed the uniform loading of the Pd species into the COF-SDU1 matrix. By using this hybrid material, Pd(II)/COF-SDU1, as a sustainable and green catalyst, one-pot cross-coupling of silanes and aryl iodides was realized with high selectivity. The catalyst can be easily recovered by a simple separation process and recycled several times without obvious loss of activity and selectivity.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 51
·26804-26809
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IF 3.708
Liang Ren,Fan Yang,Yongfeng Li,Ting Liu,Liqiang Zhang,Guoqing Ning,Zhichang Liu,Jinsen Gao,Chunming Xu
We report an environmentally-friendly approach to the synthesis of hybrids based on porous graphene and metal nanoparticles. The nitrogen-doped porous graphene (N-PG) and Pd nanoparticles decorated N-PG (Pd/N-PG) was synthesized by a plasma method. The N-PG was characterized by X-ray photoelectron spectroscopy and Raman spectroscopy, and the results clearly indicate that the amount of nitrogen doping was 6.65 wt%. The synthesized Pd/N-PG hybrid materials were confirmed by transmission electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy mapping. The hybrid material based on Pd/N-PG as a new catalyst was applied in Suzuki reaction. This catalyst offers a number of advantages such as high stability, easy removal from the reaction mixture and reusability with minimal loss of activity, showing better performance than the well-known commercial Pd/C catalyst.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2014
·
IF 5.211
Jing-Jing Lv,Shan-Shan Li,Ai-Jun Wang,Li-Ping Mei,Jiu-Ju Feng,Jian-Rong Chen,Zhaojiang Chen
Monodisperse bimetallic alloyed palladium–copper nanocrystals are uniformly supported on reduced graphene oxide nanosheets by a one-pot solvothermal strategy, with an average size of 6.81 nm. As a result, the as-prepared nanocomposites have the enlarged electrochemically active surface area (49.2 m 2 g −1 ), and display the improved electrocatalytic performance and high methanol-tolerance ability for oxygen reduction reaction in alkaline media , compared with commercial Pd black and RGOs. Those RGOs-supporting Pd–Cu alloys would have potential applications in fuel cells.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Lei Yang,Yuzhuo Jin,Xiangchen Fang,Zhenmin Cheng,Zhiming Zhou
Magnetic core–shell structured Pd-based catalysts (Fe3O4@M/Pd, M = SiO2, AlOOH, TiO2, Cu3(BTC)2, and ZIF-8) were prepared and applied to semihydrogenation of phenylacetylene. The catalysts were characterized by various techniques, and it was found that the predominant chemical state of Pd species on the catalyst surface was PdO2, which was stable under the reaction condition (40 °C and 0.1 MPa H2). Among all the catalysts studied, Fe3O4@ZIF-8/Pd showed the highest selectivity to styrene, which was also superior to conventional catalysts such as Pd/C, Pd/Al2O3 and Lindlar catalyst. The high selectivity of Fe3O4@ZIF-8/Pd was mainly ascribed to the electronic effect between PdO2 and ZIF-8. Further investigation revealed that the phenylacetylene hydrogenation on Fe3O4@ZIF-8/Pd was solvent-dependent with the activity increasing with the solvent polarity. Among eight solvents tested, methanol was the most effective, with high and stable selectivity to styrene (around 92%) at complete conversion of phenylacetylene (≥99.5%) during five consecutive cycles.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2023
·
IF 13.3
Lin Yuan,Yancheng Hu,Guangyi Li,Fengan Han,Aiqin Wang,Yu Cong,Tao Zhang,Feng Wang,Ning Li
The production of industrial chemicals with renewable biomass feedstock holds potential to aid the world in pursuing a carbon-neutral society. Trimellitic and trimesic acids are important commodity chemicals in industry that are prepared by the oxidation of petroleum-derived trimethylbenzene. To reduce the dependence on the limited oil source, we develop a potential sustainable alternative towards trimellitic and trimesic acids using biomass-based 2-methyl-2,4-pentandiol (MPD), acrylate and crotonaldehyde as starting materials. The process for trimellitic acid includes dehydration/D-A reaction of MPD and acrylate, flow aromatization over Pd/C catalyst, hydrolysis and catalytic aerobic oxidation (60% overall yield). The challenging regioselectivity issue of D-A reaction is tackled by a matched combination of temperature and deep eutectic solvent ChCl/HCO 2 H. Crotonaldehyde can also participate in the reaction, followed by Pd/C-catalyzed decarbonylation/dehydrogenation and oxidation to provide trimesic acid in 54% overall yield. Life cycle assessment implies that compared to conventional fossil process, our biomass-based routes present a potential in reducing carbon emissions.
研究领域:
生物化学
·
绿色化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Shan-Shan Li,Jie-Ning Zheng,Ai-Jun Wang,Fang-Lei Tao,Jiu-Ju Feng,Jian-Rong Chen,Haiying Yu
In this work, a facile one-pot wet-chemical approach is developed for synthesis of three-dimensional platinum-on-palladium (Pt-on-Pd) bimetallic nanodendrites supported on reduced graphene oxide (rGO), where octylphenoxypolye thoxyethanol (NP-40) acts as a growth-directing agent and formic acid serves as a reducing agent under mild conditions. The nanocomposites exhibit enhanced oxygen reduction reaction activity (onset potential of 0.05 V, half-wave potential of −0.15 V, electron transfer number >3.99) and better stability in alkaline media . The diffusion-limited current densities of Pt-on-Pd/rGO at −0.60 V (3.99 mA cm −2 and 22.72 mA mg −1 ) are much higher than those of PtPd/rGO, Pt/rGO, Pd/rGO, PtPd nanoparticles/rGO, Pt black, Pd black, Pt/C, and Pd/C catalysts. This method is general, facile, and green for preparation of rGO-supporting bimetallic electrocatalysts .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 95
·52640-52646
·
IF 3.708
Qian-Li Zhang,Jin-Xia Feng,Ai-Jun Wang,Jie Wei,Jiu-Ju Feng
Bimetallic alloyed Pd–Au nanochain networks supported on reduced graphene oxide (Pd–Au NNs/RGO) were prepared by a one-pot wet-chemical co-reduction method with the assistance of caffeine as a capping agent and a structure directing agent, while no seed, template, or surfactant was involved. It was found that the dosage of caffeine and the concentrations of the precursors (i.e. PdCl42− + AuCl4−) played essential roles in the formation of Pd–Au NNs. Moreover, the as-prepared nanocomposites exhibited much better electrocatalytic performance than those of conventional Pd black and Pd–C toward oxygen reduction reaction (ORR) in alkaline media in terms of the onset potential, limiting current, and stability.
研究领域:
材料科学
·
电化学
✓ 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）