1
|
Wang WH, Pan CY, Liu CM, Lin WC, Jiang PH. Chirality-Induced Noncollinear Magnetization and Asymmetric Domain-Wall Propagation in Hydrogenated CoPd Thin Films. ACS APPLIED MATERIALS & INTERFACES 2022; 14:20151-20158. [PMID: 35468278 DOI: 10.1021/acsami.1c23276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Array-patterned CoPd-based heterostructures are created through e-beam lithography and plasma pretreatment that induces oxidation with depth gradient in the CoPd alloy films, breaking the central symmetry of the structure. Effects on the magnetic properties of the follow-up hydrogenation of the thin film are observed via magneto-optic Kerr effect microscopy. The system exhibits a strong vertical and lateral antiferromagnetic coupling in the perpendicular component between the areas with and without plasma pretreatment, and asymmetric domain-wall propagation in the plasma-pretreated areas during magnetization reversal. These phenomena exhibit evident magnetic chirality and can be interpreted with the Ruderman-Kittel-Kasuya-Yosida coupling and the Dzyaloshinskii-Moriya interaction (DMI). The sample processing demonstrated in this study allows easy incorporation of lithography techniques that can define areas with or without DMI to create intricate magnetic patterns on the sample, which provides an avenue toward more sophisticated control of canted spin textures in future spintronic devices.
Collapse
Affiliation(s)
- Wei-Hsiang Wang
- Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
- Department of Physics, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Ching-Yang Pan
- Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
| | - Chak-Ming Liu
- Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
| | - Wen-Chin Lin
- Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
| | - Pei-Hsun Jiang
- Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan
| |
Collapse
|
2
|
Enneiymy M, Fioux P, Le Drian C, Matei Ghimbeu C, Becht JM. Palladium nanoparticles embedded in mesoporous carbons as efficient, green and reusable catalysts for mild hydrogenations of nitroarenes. RSC Adv 2020; 10:36741-36750. [PMID: 35517931 PMCID: PMC9057023 DOI: 10.1039/d0ra05713d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 09/22/2020] [Indexed: 11/21/2022] Open
Abstract
The reduction of nitroarenes is the most efficient route for the preparation of aromatic primary amines. These reductions are generally performed in the presence of heterogeneous transition metal catalysts, which are rather efficient but long and tedious to prepare. In addition, they contain very expensive metals that are in most cases difficult to reuse. Therefore, the development of efficient, easily accessible and reusable Pd catalysts obtained rapidly from safe and non-toxic starting materials was implemented in this report. Two bottom-up synthesis methods were used, the first consisted in the impregnation of a micro/mesoporous carbon support with a Pd salt solution, followed by thermal reduction (at 300, 450 or 600 °C) while the second involved a direct synthesis based on the co-assembly and pyrolysis (600 °C) of a mixture of a phenolic precursor, glyoxal, a surfactant and a Pd salt. The obtained composites possess Pd nanoparticles (NPs) of tunable sizes (ranging from 1–2 to 7.0 nm) and homogeneously distributed in the carbon framework (pores/walls). It turned out that they were successfully used for mild and environment-friendly hydrogenations of nitroarenes at room temperature under H2 (1 atm) in EtOH in the presence of only 5 mequiv. of supported Pd. The determinations of the optimal characteristics of the catalysts constituted a second objective of this study. It was found that the activity of the catalysts was strongly dependent on the Pd NPs sizes, i.e., catalysts bearing small Pd NPs (1.2 nm obtained at 300 °C and 3.4 nm obtained at 450 °C) exhibited an excellent activity, while those containing larger Pd NPs (6.4 nm and 7.0 nm obtained at 600 °C, either by indirect or direct methods) were not active. Moreover, the possibility to reuse the catalysts was shown to be dependent on the surface chemistry of the Pd NPs: the smallest Pd NPs are prone to oxidation by air and their surface was gradually covered by a PdO shell decreasing their activity during reuse. A good compromise between intrinsic catalytic activity (i.e. during first use) and possibility of reuse was found in the catalyst made by impregnation followed by reduction at 450 °C since the hydrogenation could be performed in only 2 h in EtOH or even in water. The catalyst was quantitatively recovered after reaction by filtration, used at least 7 times with no loss of efficiency. Advantageously, almost Pd-free primary aromatic amines were obtained since the Pd leaching was very low (<0.1% of the introduced amount). Compared to numerous reports from the literature, the catalysts described here were both easily accessible from eco-friendly precursors and very active for hydrogenations under mild and “green” reaction conditions. Size induced activity and reusability of mesoporous carbons containing Pd NPs are demonstrated herein for mild and green hydrogenations of nitroarenes.![]()
Collapse
Affiliation(s)
| | - Philippe Fioux
- Université de Haute-Alsace
- CNRS
- IS2M
- F-68100 Mulhouse
- France
| | | | | | | |
Collapse
|
3
|
Jiang L, Wang K, Wu X, Zhang G, Yin S. Amorphous Bimetallic Cobalt Nickel Sulfide Cocatalysts for Significantly Boosting Photocatalytic Hydrogen Evolution Performance of Graphitic Carbon Nitride: Efficient Interfacial Charge Transfer. ACS APPLIED MATERIALS & INTERFACES 2019; 11:26898-26908. [PMID: 31268294 DOI: 10.1021/acsami.9b07311] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Noble metals usually work as the cocatalyst for photocatalytic water splitting, but their rare and expensive properties narrowed their wide development. Transition-metal sulfides have appeared to be promising non-noble metal cocatalysts in the hydrogen evolution reaction (HER) to meet future energy demands. Meanwhile, many studies focus on the fabrication of bimetallic catalysts because of their remarkably superior catalytic activity compared with monometallic substances. Herein, amorphous bimetallic cobalt nickel sulfide (CoNiSx) was fabricated to work as a cocatalyst in the photocatalytic H2 evolution reaction, which can couple with pristine graphitic carbon nitride (g-C3N4). CoNiSx-CN exhibits a larger specific surface area compared with g-C3N4, making it possess more reaction active sites. Moreover, the contacted interface in the CoNiSx-CN composite photocatalyst contributes to higher separation efficiency of photogenerated carriers, which was proved by experimental and theoretical calculations. More importantly, the theoretical calculation also verified that CoNiSx-CN has relatively closer Gibbs free energy to zero than pure g-C3N4 and corresponding monometallic cocatalyzed g-C3N4. Therefore, the prepared CoNiSx-CN composite exhibited a dramatic photocatalytic HER performance of 2.366 μmol mg-1 h-1, which is about 76-fold higher in comparison with pristine g-C3N4 and comparable to g-C3N4 with Pt as a cocatalyst under 420 nm light irradiation. This study reveals a promising and efficient bimetallic cocatalyst for the photocatalytic H2 evolution reaction.
Collapse
Affiliation(s)
- Lisha Jiang
- School of Resources and Environmental Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , China
| | - Kai Wang
- School of Resources and Environmental Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , China
| | - Xiaoyong Wu
- School of Resources and Environmental Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , China
| | - Gaoke Zhang
- School of Resources and Environmental Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , China
| | - Shu Yin
- Institute of Multidisciplinary Research for Advanced Materials , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan
| |
Collapse
|
4
|
Chang PC, Chang YY, Wang WH, Lo FY, Lin WC. Visualizing hydrogen diffusion in magnetic film through magneto-optical Kerr effect. Commun Chem 2019. [DOI: 10.1038/s42004-019-0189-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
|
5
|
Mirzaei P, Bastide S, Dassy A, Bensimon R, Bourgon J, Aghajani A, Zlotea C, Muller-Bouvet D, Cachet-Vivier C. Electrochemical oxidation of urea on nickel-rhodium nanoparticles/carbon composites. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.11.205] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
6
|
Fu W, Cao Y, Feng Q, Smith WR, Dong P, Ye M, Shen J. Pd-Co nanoalloys nested on CuO nanosheets for efficient electrocatalytic N 2 reduction and room-temperature Suzuki-Miyaura coupling reaction. NANOSCALE 2019; 11:1379-1385. [PMID: 30604824 DOI: 10.1039/c8nr08724e] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Due to their synergistic and tunable effects, bimetallic alloy systems have recently attracted considerable attention as superior catalysts. Herein, Pd-Co bimetallic alloy nanoparticles were uniformly deposited onto CuO nanosheet supports. This nanostructured catalyst was first shown to be an effective catalyst to convert N2 to NH3 in 0.1 M KOH with a yield of 10.04 μg h-1 mg-1cat. and a faradaic efficiency of 2.16%. The catalyst also performed well in the Suzuki-Miyaura coupling reaction at room temperature without an inert atmosphere and any toxic solvents. Thus, the catalyst is consistent with the principles of green chemistry. Due to the synergistic effects, this bimetallic Pd-Co catalyst shows higher catalytic activity than its monometallic counterparts. Moreover, the Pd/Co ratio was tuned to achieve the best catalytic performance. Finally, the Pd-Co/CuO catalyst presented good stability and recyclability. The superior catalytic activity of the bimetallic alloy catalyst make it an alternative material for catalytic applications in the future.
Collapse
Affiliation(s)
- Wenzhi Fu
- Institute of Special Materials and Technology, Fudan University, Shanghai, 200433, P. R. China.
| | | | | | | | | | | | | |
Collapse
|
7
|
Enneiymy M, Le Drian C, Matei Ghimbeu C, Becht JM. Reusable magnetic PdxCoy nanoalloys confined in mesoporous carbons for green Suzuki–Miyaura reactions. RSC Adv 2018; 8:17176-17182. [PMID: 35539224 PMCID: PMC9080438 DOI: 10.1039/c8ra02214c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 04/26/2018] [Indexed: 01/12/2023] Open
Abstract
(Pdx–Coy)@MC were prepared in one-pot via an eco-friendly route and used many times for Suzuki reactions in H2O or H2O/EtOH mixture.
Collapse
Affiliation(s)
- Mohamed Enneiymy
- Université de Haute-Alsace
- CNRS
- IS2M UMR 7361
- F-68100 Mulhouse
- France
| | - Claude Le Drian
- Université de Haute-Alsace
- CNRS
- IS2M UMR 7361
- F-68100 Mulhouse
- France
| | | | | |
Collapse
|
8
|
Martinez de Yuso A, Maetz A, Oumellal Y, Zlotea C, Le Meins JM, Matei Ghimbeu C. Optimization of the synthesis of Pd-Au nanoalloys confined in mesoporous carbonaceous materials. J Colloid Interface Sci 2017. [DOI: 10.1016/j.jcis.2017.06.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
9
|
Yuan E, Wu C, Hou X, Dou M, Liu G, Li G, Wang L. Synergistic effects of second metals on performance of (Co, Ag, Cu)-doped Pd/Al2O3 catalysts for 2-ethyl-anthraquinone hydrogenation. J Catal 2017. [DOI: 10.1016/j.jcat.2017.01.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
10
|
In-situ Pd–Pt nanoalloys growth in confined carbon spaces and their interactions with hydrogen. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.nanoso.2016.11.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
11
|
Fan J, Xu H, Lv M, Wang J, Teng W, Ran X, Gou X, Wang X, Sun Y, Yang J. Mesoporous carbon confined palladium–copper alloy composites for high performance nitrogen selective nitrate reduction electrocatalysis. NEW J CHEM 2017. [DOI: 10.1039/c6nj03994d] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A mesoporous carbon confined PdCu bimetallic electrocatalyst is fabricated, which delivers a superior nitrate conversion yield and nitrogen selectivity.
Collapse
|
12
|
Oumellal Y, Provost K, Ghimbeu CM, de Yuso AM, Zlotea C. Composition and size dependence of hydrogen interaction with carbon supported bulk-immiscible Pd-Rh nanoalloys. NANOTECHNOLOGY 2016; 27:465401. [PMID: 27749273 DOI: 10.1088/0957-4484/27/46/465401] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In-depth clarification of hydrogen interaction with noble metal nanoparticles and nanoalloys is essential for further development and design of efficient catalysts and hydrogen storage nanomaterials. This issue becomes even more challenging for nanoalloys of bulk-immiscible metals. The hydrogen interaction with bulk-immiscible Pd-Rh nanoalloys (3-6 nm) supported on mesoporous carbon is studied by both laboratory and large scale facility techniques. X-ray diffraction (XRD) reveals a single phase fcc structure for all nanoparticles confirming the formation of nanoalloys in the whole composition range. In situ extended x-ray absorption fine structure (EXAFS) experiments suggest segregated local structures into Pd-rich surface and Rh-rich core coexisting within the nanoparticles. Hydrogen sorption can be tuned by chemical composition: Pd-rich nanoparticles form a hydride phase, whereas Rh-rich phases do not absorb hydrogen under ambient temperature and pressure conditions. The thermodynamics of hydride formation can be tailored by the composition without affecting hydrogen capacity at full hydrogenation. Furthermore, for hydrogen absorbing nanoalloys, in situ EXAFS reveals a preferential occupation of hydrogen for the interstitial sites around Pd atoms. To our knowledge, this is the first study providing insights into the hydrogen interaction mechanism with Pd-Rh nanoalloys that can guide the design of catalysts for hydrogenation reactions and the development of nanomaterials for hydrogen storage.
Collapse
Affiliation(s)
- Yassine Oumellal
- Université Paris Est, Institut de Chimie et des Matériaux Paris-Est (UMR7182), CNRS, UPEC, 2-8 rue Henri Dunant, F-94320 Thiais, France
| | | | | | | | | |
Collapse
|
13
|
Synthesis and stability of Pd–Rh nanoalloys with fully tunable particle size and composition. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.nanoso.2016.06.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|