MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Jiawei Xia,Yongsheng Fu,Guangyu He,Xiaoqiang Sun,Xin Wang
A nitrogen-doped carbon black (NCB) supported PdCu alloy nanocatalyst is fabricated via a facile one-pot soft chemistry route. The PdCu nanoparticles are uniformly dispersed on the NCB surface with an average size of 3.51 nm. The PdCu/NCB catalyst exhibits superior catalytic activity and significantly improved durability towards the Suzuki-Miyaura coupling reaction in ethanol/water system under mild conditions without a protective atmosphere . Particularly, the Pd5Cu5/NCB catalyst can efficiently catalyzed the SMC reaction with the yield up to 94% in 1.5 h, 7-fold higher than that by the pristine Pd/NCB catalyst (13%). Compared with the carbon black supported PdCu catalyst, nitrogen-doping can lead to better dispersion of the PdCu alloy nanoparticles on the NCB surface with a smaller particle size. The excellent catalytic performance can be attributed to the unique nanostructure of the catalyst and concerted effect of the individual components. Notably, alloying Pd with Cu can effectively reduce the cost of the 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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Haibo Yin,Junyang Zhang,Yunlong Wang,Xiaoguang Zhao,Yakun Qu,Yue Peng,Hexing Li,Yuning Huo,Junhua Li
Photocatalytic membrane reactor (PMR), coupling photocatalysis and membrane separation , has shown a considerable potential in foulant removal. However, the serious membrane fouling and fragile membrane stability still limit the application of current PMR systems. Here, we report a strategy that PdCu alloy deposited on TiO 2 , which is incorporated with polyvinylidene fluoride membrane, achieves high humic acid (HA) rejection efficiency (100%) with enhanced membrane permeation and anti-fouling performance. Detailed characterizations demonstrate that alloying effect of PdCu-TiO 2 plays multiple roles in improving PMR performance: (1) providing the paired Pd-Cu sites for enhancing HA adsorption and transferring electrons from Pd-Cu sites to HA to improve photocatalytic HA removal; (2) inducing the photothermal effect due to the carrier damping, which directly enhances membrane permeation. The remarkable properties of PdCu-TiO 2 membrane in PMR confirm the significance of alloying effect for treating aqueous organic pollutants .
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Jiaqin He,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Mesoporous ZSM-5 zeolite-supported PdCu alloy nanoparticle catalysts are synthesized via a facile and environmentally friendly method. The mesoporous structure is formed through the loss of carbon black particles encapsulated by zeolite crystals during calcination. The ZSM-5-supported PdCu nanoparticles are shown to possess mesoporous structure, evenly distributed PdCu alloy nanoparticles, and excellent catalytic performance in toluene oxidation. The mesoporous structure of the ZSM-5-supported PdCu nanoparticles provides a large specific surface area and pore size, resulting in numerous accessible active sites. The alloying of Pd with Cu both increases the catalytic performance of the catalyst and lowers its cost. Overall, the catalyst with a Pd/Cu ratio of 8:2 showed the highest catalytic activity of the fabricated materials, achieving 100 % toluene conversion at 160 °C. The mechanism of toluene oxidation over these catalysts can be explained by the Mars–van Krevelen model.
研究领域:
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
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Zhen Chen,Ya-Chuan He,Jia-Hui Chen,Xian-Zhu Fu,Rong Sun,Yan-Xia Chen,Ching-Ping Wong
PdCu alloy flower-like nanocages are synthesized through corner-etched Cu2O octahedra as templates by galvanic reaction and disproportionation reaction. PdCu alloy nanocages are obtained with the molar ratio of H2PdCl4/Cu2O = 1:1, and the Pd nanoparticles are prepared with the molar ratio of H2PdCl4/Cu2O = 2:1. The PdCu alloy flower-like nanocages display the highest catalytic activity compared with Pd nanoparticles toward methanol oxidation reaction in alkaline medium, which is 2.7 times than that of commercial Pd/C. In addition, PdCu alloy nanocages also show high poison-tolerance and good stability. The superior electrocatalytic performance of PdCu flower-like nanocages may be attributed to the unique flower-like nanocage structure with high surface area and the synergic effect of Pd and Cu.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 27
·期 49
·495403
·
IF 3.573
Dengfeng Wu,Haoxiang Xu,Dapeng Cao,Adrian Fisher,Yi Gao,Daojian Cheng
In order to combine the advantages of both 0D and 1D nanostructured materials into a single catalyst, density functional theory (DFT) calculations have been used to study the PdCu alloy NP-decorated Cu nanotubes (PdCu@CuNTs). These present a significant improvement of the electrocatalytic activity of formic acid oxidation (FAO). Motivated by our theoretical work, we adopted the seed-mediated growth method to successfully synthesize the nanostructured PdCu@CuNTs. The new catalysts triple the catalytic activity for FAO, compared with commercial Pd/C. In summary, our work provides a new strategy for the DFT prediction and experimental synthesis of novel metal NP-decorated 1D nanostructures as electrocatalysts for fuel cells.
研究领域:
材料科学
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电化学
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理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Hongyuan Shang,Hui Xu,Qingyun Liu,Yukou Du
Hydrogen sulfide (H 2 S) could be directly produced in mammals and recognized as a third gasotransmitter, which are closely associated with physiological and pathological processes. However, the detailed mechanism remains unclear, mainly due to a lack of robust sensors to accurately and quantitatively detect its concentrations in biological samples. Herein, for the first time, we develop a new electrochemical sensor for the detection of H 2 S based on the chemical reaction between copper oxide (CuO and Cu 2 O) and hydrogen sulfide (including H 2 S and HS − ) at a neutral solution (pH 7.4). Interestingly, when Na 2 S exists, copper and its oxide can be converted into Cu 2 S and CuS, resulting in an increase in the oxidation peak current of Cu 2 S-CuS with the increase of Na 2 S concentration, which is a direct evidence confirming the excellent sensor for the H 2 S detection. More importantly, the linear relationship between the oxidation peak currents of Cu 2 S-CuS and Na 2 S concentration is observed from 0.4 μM to 400 μM with a low detection limit of 0.2 μM, and satisfying selectivity. The developed strategy may have a great potential for further understanding the roles that biological H 2 S plays in biological systems.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 4
·1-10
·
IF 5.833
Liu Wendong,Guo Junnan,Chen Chuanxia,Ni Pengjuan,Jiang Yuanyuan,Zhang Chenghui,Wang Bo,Lu Yizhong
Enzyme-mimetic properties of nanomaterials can be efficiently tuned by controlling their size, composition, and structure. Here, ultrathin PdCu alloy nanosheet–assembled three-dimensional (3D) nanoflowers (Pd 1 Cu x NAFs) with tunable surface composition are obtained via a generalized strategy. In presence of H 2 O 2 , the as-synthesized Pd 1 Cu x NAFs can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to the oxidized form of TMB (oxTMB) with a characteristic absorption peak at 652 nm. Interestingly, Pd 1 Cu x NAFs show obviously composition-dependent peroxidase-like catalytic activities because of the synergistic interaction of nanoalloy. Additionally, different from 2D Pd nanosheets, the distinctive 3D superstructures are featured with rich approachable sites and proper layer spacing, which are in favor of fast mass transport and electron transfers during the catalytic process. Among the studied Pd 1 Cu x NAFs, the Pd 1 Cu 1.7 NAFs show the highest enzyme-like activities and can be successfully applied for the colorimetric detection of glucose with a low detection limit of 2.93 ± 0.53 μM. This work provides an efficient avenue to fabricate PdCu NAF nanozymes in biosensing toward glucose detection. Graphical abstract
Two-dimensional (2D) PdCu ultrathin nanosheet–assembled 3D nanoflowers (Pd 1 Cu x NAFs) with tunable surface composition exhibit substantially enhanced intrinsic peroxidase-like catalytic activities. The Pd 1 Cu 1.7 NAFs are successfully used as peroxidase mimic catalyst for the colorimetric detection of glucose with low detection limit of 2.93 μM.
研究领域:
生物传感
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材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yanan Li,Zhelin Liu,Xiangting Dong,Bo Zhao
Exploring high-performance electrocatalysts is essential for the commercial application of direct alcohol fuel cells (DAFCs). The catalytic activity and stability of Pd-based catalysts can be improved by rationally designing the morphology and composition of Pd-based catalysts. In this study, hollow spherical PdCu alloy catalysts with rough surface were synthesized. The experimental results show that the prepared PdCu catalysts exhibit excellent electrochemical performance in alcohol oxidation reaction (AOR) and oxygen reduction reaction (ORR). Specifically, for ethanol oxidation, hollow spherical PdCu alloy with a Pd to Cu molar ratio of 1:1 displays excellent mass activity up to 4361 mA mg-1Pd. Additionally, it also exhibits outstanding ORR performance, with an onset potential of 0.94 V and a half-wave potential of 0.77 V, which is better than that of commercial Pt/C electrocatalyst. Overall, the PdCu electrocatalysts synthesized in the present investigation provide valuable insights into the practical applications of DAFCs.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源材料
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Saima Ashraf,Yanyan Liu,Shuling Liu,Sehrish Mehdi,Huanhuan Zhang,Ruofan Shen,Xianji Guo,Xianli Wu,Jianchun Jiang,Yongfeng Wang,Baojun Li
Palladium-based catalysts are remarkable in endorsing hydrogen (H 2 ) generation through formic acid (HCOOH, FA) dehydrogenation under near-ambient conditions. Hydrogen energy efficiency depends on high-performance catalyst design. In this study, Pd-Cu nanoalloy catalysts with mutable atomic ratios are successfully fabricated on TiO 2 nanosheets (TiO 2 -NSs).The synergistic electronic interactions between Palladium (Pd) and copper (Cu) are revealed through a density of states (DOS) analysis of alloy supported over a mixed valence state of Ti linked to oxygen vacancies (Vo) in TiO 2 -NSs, Enhanced adsorption of target molecules reveals novel active sites for Formic acid dehydrogenation (FAD), with O─H bond cleavage via HCOO formate intermediate preceding C─H and C─O bond cleavage. Experimental and theoretical research demonstrates that the Pd-Cu/TiO 2 -NSs (3:7) catalyst d electron redistribution and d-band center shift lower the activation energy for O─H bond cleavage, exhibit superior H 2 production than pure Pd and Cu, increasing Pd electron density due to synergistic effects from reactive crystal facets, defects, and strong metal support interactions (SMSI), lowering the activation energy for HCOOH dissociation step, generating carbon dioxide (CO 2 ) and H 2 with a unprecedented high turnover frequency (TOF) of 6268 mol H2 .h −1 .molPd −1 at 303K with activation energy ( E a ) of 15 KJ mol −1 . This attempt models an efficient HCOOH-to-hydrogen catalyst.
研究领域:
催化
·
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）