COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Guangliang Niu,Fangyan Liu,Yun Yang,Yunzhi Fu,Wei Wang
Multimetallic nanomaterials have many applications. The controlled synthesis of multimetallic nanomaterials is highly desired. We report a study on using penta-fold twinned (PFT) Au nanorods (NRs) as seeds to synthesize PFT Pd-Au-Pd segmental NRs. The results show that the different crystal structures of seeds, I − and cetyltrimethylammonium bromide (CTAB) significantly affect the deposition of Pd on seeds surface. The PFT Pd-Au-Pd segmental NRs showed excellent surface-enhanced Raman scattering (SERS) performance and improved catalytic activity. Our research is of great significance for the synthesis of similar nanostructures, and we also shown that PFT Pd-Au-Pd segmental NRs might have potential applications in studying the process of organic reaction.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
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IF 6.007
Xingfa Li,Xin Liu,Lili Xu,Yuezhong Wen,Jianqing Ma,Zucheng Wu
Heterogeneous Pd catalytic Fenton-like systems with in-situ-generated H 2 O 2 have recently gained significant attention for wastewater treatment. Intense research efforts have been focused on developing highly efficient Fenton-like catalysts. It is known that nanoparticle size and appropriate coordination of active compositions are important for the fabrication of a highly efficient multicomponent catalyst. Unfortunately, effects of these factors on Fenton-like reaction are still unknown. To decipher the puzzle, we designed multicomponent Pd/PdO/Fe 2 O 3 nanoparticles in SBA-15 (denoted as FePd-SBA) as a Fenton-like catalyst which possesses uniform and highly dispersed nanoparticles (small size about 5 nm) in space-confined channels of SBA-15. The fabricated catalyst shows high catalytic activities in Fenton-like reaction for dye degradation. For example, 98.6% removal of dye Acid Red 73 was obtained under in-situ generation of hydrogen peroxide. In contrast, when the catalyst loaded on SiO 2 without channels or pores (FePd–SiO 2 ) was prepared, and compared with FePd–SBA, FePd–SiO 2 showed noticeably poor performance (51.6%) under same conditions. Obviously, such a difference in results is due to the confinement effect of SBA-15 porous channels. It was also found that Fe and Pd played important roles in the synergistic effect, that is, Pd worked in in-situ H 2 O 2 generation and Fe species worked in decompose H 2 O 2 to degrade organic pollutants. When we applied this catalyst for Fenton-like reaction with addition of H 2 O 2 , it was also found that Pd and PdO played important roles and the synergistic effect between Fe and Pd species actually existed in dye removal. The unique nanostructure makes the catalyst to be a novel and welcoming choice for H 2 O 2 favorite reactions.
研究领域:
环境科学
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催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Advances
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2022
·Vol. 4
·期 19
·4162-4168
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IF 5.598
He Zhu,Yun-Zhi Dai,Xiang-Chao Sun,Hong Xia
We reported a fine H2 sensor based on single Pd microwires (SPMs) by femtosecond-laser-induced deposition of palladium nanoparticles (PdNPs), which exhibits excellent H2 sensing performance. The PdNPs with good dispersion were prepared by ultrasonic assisted one-step solution synthesis. The sensor has a wide detection range of 0.001–4.0% H2 sensing at room temperature. With the increase of the H2 concentration, the SPM sensor presents two sensing mechanisms, the formation of PdHx and hydrogen induced lattice expansion regulating the conductivity of SPMs. This fine hydrogen sensor is promising to be applied to human health monitoring, environmental air detection and other integrated intelligent devices.
研究领域:
材料科学
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传感器技术
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 52
·2306014
·
IF 13.3
Songliang Liu,Hugang Zhang,Tianlun Ren,Hongjie Yu,Kai Deng,Ziqiang Wang,You Xu,Liang Wang,Hongjing Wang
2D metallene possess high surface area and excellent electron transport capability, thus enabling efficient application in oxygen reduction reaction (ORR). However, the interface regulation and electronic structure optimization of metallene are still great challenges. Herein, Pd–B/Pd hetero-metallene is constructed by interface engineering and B modification strategies for efficient electrocatalytic ORR. The 2D configuration of Pd–B/Pd hetero-metallene exposes a large number of surface atoms and unsaturated defect sites, thus providing abundant catalytic active sites and exhibiting high electron mobility. More importantly, interface engineering and B modification synergistically optimizing the electronic configuration of the metallene system. This work not only provides an effective strategy for the rational regulation of the electronic configuration of metallene, but also offers a reference for the construction of efficient ORR catalysts.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 28
·期 2
·487-493
·
IF 2.183
Feng Lijuan,Qiu Lu,Wang Shunli,Chang Zhaosen,Lu Yan,Dong Anwang,Chen Qi,Sui Zhuyin
The direct conversion of tremendous greenhouse gas methane into various value-added chemical products or energy fuels is not only a concern associated with an economic interest but also related to environmental protection. However, neither industry nor academia has an effective or low-cost way to directly achieve this result. Herein, a high specific area (962 m 2 g −1 ) porous organic polymer was designed and used as a substance to support catalytic active sites, including PdBr 2 , Pd(OAc) 2 , and well-dispersed AuPd bimetallic nanoparticles which were reduced via hydrogen flow. The as-synthesized catalysts (HNU-2 and HNU-3) can not only maintain the porous and stable structure of their pristine matrix but also show extremely high catalytic performance in methane direct transformation systems for preparing methanol derivative methyl trifluoroformate. Our simple strategy provides a complementary alternative to application of methane via an efficient one-step conversion procedure in order to reduce its impact on climate change and obtain value-added chemicals.
研究领域:
催化
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环境化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Jun Qin,Xiaomei Li,Zezhong Chen,Feng Feng
Commercially available 9-bromophenanthrene (9-BrP) was used as fluorescence probe for determination of trace palladium (Pd). Under the catalysis of Pd 2+ , 9-BrP is converted to phenanthrene, which can emit stronger fluorescence. Consequently, fluorescence of Pd sample is greatly enhanced, and the enhancement is positively correlated with the concentration of Pd 2+ . The catalytic reaction exhibits excellent selectivity and specificity, which enables a simplification on the pre-treatment of real sample. The method has a wide linear range of 0.07–18 μM and a detection limit of 50 nM for Pd 2+ . Detection and recovery experiments of Pd in lake water, Pd-carbon catalyzer and surface soil are also satisfactory, indicating that the method has better feasibility and application potential in routine determination of Pd.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Manyi Gao,Fenyang Tian,Xin Zhang,Yequn Liu,Zhaoyu Chen,Yongsheng Yu,Weiwei Yang,Yanglong Hou
Reinforcing the charge separation and transfer in layered polymeric carbon nitride (PCN) is the key issue to enhance its photocatalytic activity but still remains very challenging. Herein, for the first time, the synergetic Pd single atoms (PdSAs) and carbon-supported Pd nanoparticles (NPs) are introduced into the interlayer and surface of layered PCN respectively to address this challenge. The PdSAs are in intimate contact with the adjacent PCN layers and serve as interlayer charge transfer channels, while the carbon-supported Pd NPs contribute to multistep PCN-carbon-Pd NPs Schottky junctions on PCN surface. Experiments and theoretical calculations demonstrate that such unique architectures provide intrinsic driving force to extract the electrons from PCN to outermost Pd NPs with high migration rate via vertical PdSAs channels. This directional charge transfer in PCN greatly expedite the separation of charge carriers in both inner and surface of PCN and simultaneously yield electron-rich Pd NPs active sites with optimized H 2 adsorption energy , thus leading to improved intrinsic H 2 evolution reaction kinetics. Consequently, the Pd/PCN 2 performs ultrahigh photocatalytic H 2 evolution rate of 83.34 mmol g −1 h −1 in the dispersed particulate system and 100.4 mmol h −1 m −2 in the film form under simulated sunlight. This work provides a new promising approach to engineer the spatial charge transfer behaviors for high-performance PCN-based photocatalysts .
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Ming Lei,Zhiying Wang,Lihua Zhu,Wenshan Nie,Heqing Tang
Deep debromination of polybrominated diphenyl ethers (PBDEs) by visible light photocatalysis is still a challenge in the field of halogenated pollutants control. Here, an efficient photocatalyst (Pd/g-C 3 N 4 ) was prepared by a simple impregnation-chemical reduction method with bulk g-C 3 N 4 and PdCl 2 as precursors. Under preferred reaction conditions (visible light irradiation for 120 min), the use of the 0.5% Pd/g-C 3 N 4 composites (0.4 g L −1 ) yielded an almost complete debromination of BDE47 (10 μmol L −1 ) in methanol-water mixture, while the debromination of BDE47 did not occur on pure g-C 3 N 4 . A “Pd-promoted active H atom species attack and C-Br bond cleavage” route was proposed according to the identified degradation intermediates. A catalytic mechanism was further clarified: Pd nanoparticles exerted affinity interaction with bromine atoms, and the storing of electrons on Pd would increase the binding interaction. In the debromination process, methanol acts as both a hole scavenger and a hydrogen donor to provide active H atom species through the reaction of H + and photogenerated electrons on Pd nanoparticles. The initiation of BDE47 debromination on Pd nanoparticles required an induction period to enrich a critical amount of electrons for stretching the C-Br bond and its subsequent being attacked by active H atoms. The generated 2,2′-dibromodiphenyl ether (BDE4) would be further reduced to bromine-free products by hydro-debromination process or coupling reaction.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Yuning Qu,Ying Sun,Ming Song,Hao Wang,Ningru Xiao
An efficacious strategy to enhance the activity and stability of electrocatalysts for alcohol oxidation reactions is the formation of alloys of palladium with oxygenophilic metals. In this study, Palladium nano chains with an average diameter of approximately 4.4 nm were synthesized via a one-step hydrothermal approach, employing creatine as the structural guide. The one-dimensional structure yielded a huge electrochemically active area (84.5 m 2 g −1 ) and good electrical conductivity. the mass activity of Pd 87 Au 13 NCs for alkaline ethanol oxidation reaction was 4050 mA mg Pd+Au −1 , which is 7.32 times higher thancommercial Pd/C, and also maintains a high residual current density after 20000 s stability test. In addition, the excellent performance of the material was demonstrated during the oxidation of ethylene glycol and glycerol. The improved catalytic performance is owed to the interconnected chain shape providing fast electron transport channels, and the Au doping not only optimizes the electronic structure of Pd but also has a bifunctional effect, which effectively removes the carbon-containing intermediates generated by Pd during alcohol oxidation, thus improving its resistance to poisoning 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
Catalysts
·
2021
·Vol. 11
·期 4
·522
·
IF 4.146
Fangchao Li,Bin Liu,Yuanhao Shen,Jie Liu,Cheng Zhong,Wenbin Hu
Palladium catalysts have attracted widespread attention as advanced electrocatalysts for the formic acid oxidation (FAO) due to their excellent electrocatalytic activity and relatively high abundance. At present, electrodeposition methods have been widely developed to prepare small-sized and highly-dispersed Pd electrocatalysts. However, the customary use of surfactants would introduce heterogeneous impurities, which requires complicated removal processes. In this work, we reported a two-step electrochemical method that employed square-wave potential treatment (SWPT) to modify electrodeposited Pd particles without the use of capping agents. Under the SWPT with a mixed frequency, Pd particles show significantly reduced size and more dispersed distribution, exhibiting a high mass activity of 1.43 A mg−1toward FAO, which is 4.6 times higher than the counterpart of commercial Pd/C. The increase in electrocatalytic activity of FAO is attributed to the highly developed surface of palladium particles uniformly distributed over the support surface.Keywords:Pd nanoparticles;formic acid oxidation;electrocatalysis;square-wave potential treatment
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2013
·
IF 3.41
Jing Chen,Shijun Huang,Jin Lin,Weiping Su
Using a supported palladium catalytic system, the reaction of nitroarenes with benzyl alcohols occurred smoothly via hydrogen transfer to produce imines in an atom-economical manner. The palladium species were dispersed well on hydrotalcite (HT) support and palladium nanoparticles with size of about 3.5 nm were formed during reaction. Both of the small size of palladium nanoparticles and the rich hydroxyl groups on HT surface enhanced the catalytic performance of Pd/HT. The catalytic system is recyclable and amenable to a variety of aromatic alcohols and nitro compounds.
研究领域:
化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lei Zhuang,Zhijun Jia,Yi Wang,Xiaoming Zhang,Suli Wang,Jing Song,Liangliang Tian,Tao Qi
For commercially viable direct methanol fuel cells, electrocatalysts play a crucial role in motivating the sluggish methanol oxidation reaction (MOR) over anode. Unfortunately, the large-scale applications of current MOR catalysts are hampered by their poor tolerance to poisoning and fast activity degradation. Herein, a unique composite catalyst comprised of partial Pd nanoparticles and partial Pd single atoms (Pd NPs /Pd-N x @C) is developed. The as-fabricated catalyst exhibits remarkable activity of 9.45 mA·cm −2 towards MOR in alkaline solution, which is 7.05 and 3.92 times that of commercial Pd/C and nanoparticle type (Pd NPs @C) electrocatalysts, respectively. Impressively, the Pd NPs /Pd-N x @C shows the highest long-time stability with 90.38% and 89.8% of the initial activity retained after 3600 s chronoamperometry (CA) test and 2000 cycles of cyclic voltammetry (CV) measurements with accelerated durability test (ADT), respectively. Combined with high-angle annular darkfield scanning transmission electron microscopy (HAADF-STEM), X-ray adsorption fine structure (XAFS) spectra and X-ray photoelectron spectroscopy (XPS) analyses, the superior performance of Pd NPs /Pd-N x @C can be ascribed to the synergistic effect from the Pd single atoms, N-doped carbon supports and Pd nanoparticles. Notably, the embedded Pd single atoms are liable to transfer electrons to the substrate due to the electronic metal-support interactions (EMSI) and the charge transfer between Pd nanoparticles and carbon supports is suppressed, inducing a weak adsorption strength of poisonous carbonous intermediate species on active Pd nanoparticles and improved poisoning tolerance in MOR process, which is verified by density functional theory (DFT) calculations as well as CO-stripping voltammetry experiments. This work not only contributes the first example of a synergistic catalyst between nanoparticles and single atoms for MOR but also deepens the knowledge on the metal-support interaction.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
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