Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 6
·1239-1244
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IF 0.7
Xiang Ji,Jin Hao,Ju Fan,Lu Yanzhen,Wang Fankuo
Abstract In this paper, we have synthesized a series of PdCu bimetallic nanoparticles (NPs) catalysts using the noble-metal-induced reduction process and investigated in detail by HRTEM, EDS mapping, XRD, and ICP-AES. More importantly, we also found that PdCu bimetallic NPs catalysts showed a compositional influence in the reaction of nitrobenzene reduction. When the palladium molar percentage of the PdCu NPs catalysts increases to more than 0.66, the main product is azoxybenzene. While the palladium molar percentage of the PdCu NPs catalysts dropped below 0.41, the main product is aniline. From the experimental results, the different catalytic results for nitrobenzene reduction could be attributed to the changes in the electronic structural and surface composition of the PdCu bimetallic NPs.
研究领域:
化学
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催化材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yanxin Bai,Xiang Gong,Na Ye,Xiaoying Qi,Zhao Jiang,Tao Fang
To facilitate the electrocatalytic behavior of Direct Ethanol Fuel Cells (DEFCs), a sequence of bimetallic Pd x Cu y /Ni 2 P-C catalysts are synthesized via the microwave-assisted ethylene glycol reduction method. The results indicate that our designed Pd 2 Cu/Ni 2 P-C(1:1) catalyst owns high activity (3974.08 mA mg −1 Pd ), 8.3 times higher than the commercial Pd/C. The durability and the CO tolerance of the corresponding catalysts are also investigated by chronoamperometry (CA) and CO stripping measurements, implying Pd 2 Cu/Ni 2 P-C(1:1) shows good durability and the anti-CO poisoning ability for EOR in alkaline media . The electrochemical impedance spectra (EIS) analysis reveals lower charge transfer resistance for Pd 2 Cu/Ni 2 P-C(1:1). Combined with the results of XRD , HRTEM , XPS and electrochemical measurements, we found that the good electrocatalytic activity , CO tolerance and long-term durability of Pd 2 Cu/Ni 2 P-C(1:1) may be provided by the electronic and strain effect among Pd, Cu and Ni 2 P, which will bring the downshift in the d-band center of catalysts and the weakened adsorption of intermediates.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
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
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 6
·期 9
·3906-3912
·
IF 8.867
Jiali Sheng,Jiahui Kang,Huangqing Ye,Jinqi Xie,Bo Zhao,Xian-Zhu Fu,Yan Yu,Rong Sun,Ching-Ping Wong
Porous octahedral PdCu alloy nanocages are prepared by templating against Cu2O together with the disproportionation and displacement reactions at room temperature. Through tuning the molar ratios of the Pd/Cu precursors (PdCl42−/Cu2O), the morphology and the electrocatalysis of the octahedral PdCu nanocages can be controlled. The PdCu-5 (Pd/Cu precursor ratio of 1 : 5) nanocages exhibit superior electrocatalytic activity (1090 mA mgPd−1) towards the methanol oxidation reaction, 2.9 times higher than that of the commercial Pd/C catalyst, with remarkable durability. The combined characterization by SEM, TEM, XRD and XPS demonstrated that the excellent performance and durability of the PdCu-5 nanocages can be ascribed to their excellent hollow and porous structures as well as the electronic effect between the noble metal Pd and the cheap metal Cu. Herein, this kind of nanomaterial with novel cage-like structures is a promising catalyst for direct methanol fuel cells (DMFCs).
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Changkun Qiu,Hao Zhang,Qingrun Li,Yifan Song,Fei An,Haozhi Wang,Shiqiang Wang,Liang Zhu,Chunxiao Lv,Dongzhi Zhang
To enhance the detection performance of hydrogen (H 2 ), we employed a self-sacrificing template method to prepare a three-dimensional (3D) PdCu-modified Ti 3 C 2 T x nanocomposite , denoted as PdCu/Ti 3 C 2 T x . Within 3D PdCu/Ti 3 C 2 T x nanocomposite, PdCu as the active center component, was evenly distributed on Ti 3 C 2 T x nanosheets . The unique architecture increased the exposure of active center sites, while the Ti 3 C 2 T x nanosheets provided additional gas diffusion channels, thereby contributing to improved gas sensing performance. Comparing to PdCu nanoparticles , PdCu/Ti 3 C 2 T x exhibited an enhancing response and a fast response time of 4 s to 0.5 % H 2 . PdCu/Ti 3 C 2 T x also showed an ultra-low detection limit of 0.1 % H 2 and excellent repeatability, selectivity and long-term stability. The outstanding gas sensing performance could be attributed to the 3D structure and the heterostructure between PdCu and Ti 3 C 2 T x . The insights gained from this study provide novel perspectives for designing and synthesizing high-performance gas-sensitive materials.
研究领域:
材料科学
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化学传感器
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Huawei Xu,Hui Xu,Zehan Chen,Xianqiang Ran,Jianwei Fan,Wei Luo,Zhenfeng Bian,Wei-xian Zhang,Jianping Yang
Issues of uniform incorporation of catalytic functional species with controllable sizes, shapes, compositions, and functions into porous carbon scaffolds remain significant challenges toward enriching and boosting performance. Here, we develop a straightforward approach that introduces dicyandiamide as a nitrogen source to chelate with metal species and combines with the surfactant-templating self-assembly method for the fabrication of highly dispersed catalysts anchored in nitrogen-containing ordered mesoporous carbon (NOMC). As a result, these functional catalyst (such as PdCu nanocrystals)-embedded NOMC composites manifest a synergistic catalytic capability for the electroreduction of nitrate in neutral electrolyte, with more than 90% nitrate removed under an ultra-low concentration of 100 ppm and a high nitrogen selectivity of 60% after 10 repeated tests.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
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
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电化学
·
纳米催化
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能源材料
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燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 49
·73935-73945
·
IF 5.19
Li Zhangjie,Chen Yongdong,Deng Jie,Luo Li,Gao Wenxiang,Yuan Liang
In this paper, we prepared a series of Ce 1- x Ti x O 2 ( x = 0–0.20) nanorods by hydrothermal method, which were used to construct the PdCu/Ce 1− x Ti x O 2 catalysts. The Ce 1− x Ti x O 2 and PdCu/Ce 1− x Ti x O 2 samples were characterized by transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), N 2 adsorption–desorption, X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometer (ICP-OES), etc. Catalytic activity, stability, and repeatability of the catalysts for methanol oxidation were investigated. The results show that doping a proper amount of titanium could strengthen the interaction between Ce 1− x Ti x O 2 support and PdCu nanoalloy, thus increasing the oxygen vacancy concentration and promoting Pd species with a higher oxidation state. These modified properties are beneficial for the deep oxidation of methanol. The light-off temperature ( T 50 ) and full-conversion temperature ( T 90 ) of methanol over the PdCu/CeO 2 catalyst are 108 °C and 159 °C, respectively. The greatest activity improvement is found for PdCu/Ce 0.9 Ti 0.1 O 2 , which shows the lowest T 50 of 88 °C and T 90 of 138 °C. Furthermore, neither PdCu/CeO 2 nor the modified PdCu/CeO 2 catalyst produces by-products and exhibit excellent stability and repeatability throughout the whole test period. This study provides a reference for in-depth understanding and designing of efficient and stable CeO 2 -based oxidation catalysts. Graphical abstract
研究领域:
催化
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材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qizhi Dong,Wenxia Zeng,Hansheng Wan,Shumin Yu,Cancheng Guo,Meiling Huang
A highly efficient and CO tolerant PdCu electrocatalysts supported on amino-rich, cationic poly(diallyl dimethyl ammonium chloride)(PDDA) functionalized TiO 2 (PdCu/TiO 2 (P)-C) has been developed. The catalysts were characterized by transmission electron microscopy (TEM),X-ray diffraction (XRD)，cyclic voltammograms and chronoamperometry. The PtCu particles with average size ∼3.5 nm are well dispersed on TiO 2 (P). PdCu/TiO 2 (P)-C catalysts exhibit a superior electrocatalytic activity and stability for the formic acid oxidation reaction compared with the Pd/TiO 2 (P)-C. Electrochemical measurements indicate that PdCu/TiO 2 (P)-C(1:2) catalyst has the best performance for formic acid electro-catalytic oxidation in terms of durability and Pd-mass activity among three catalysts (Pd 1 Cu 1 ,Pd 1 Cu 2 ,Pd 1 Cu 3 ). The possible reason is that the addition of Cu is beneficial to lower appropriately the d-band center of Pd and increase the electrochemical active surface area of the PdCu/TiO 2 (P)-C nanocatalysts, but when the content of Cu rises to a certain extent, the morphology of the catalyst nanoparticles will transform into linear structure leading to increased particle size.
研究领域:
化学工程
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材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Weixin Miao,Songliang Liu,Yuewen Sun,Cong Zhang,Meixiang Zheng,Guangshuo Li,Xuejing Cui,Xin Zhou,Luhua Jiang
Electrocatalysis, a form of heterogeneous catalysis, is closely associated with both catalyst properties and the catalyst/electrolyte interfacial microenvironment. Herein, we rationally design and synthesize a unique PdCu nano-sea urchins (PdCu NSUs) featured with high-curvature nanotips, by which the interfacial microenvironment is expected to be tailored to the electrocatalytic reactions. PdCu NSUs exhibit excellent activity for ethanol electrooxidation, with a specific activity of 4.11 mA cm −2 and a mass activity of 2.24 mA μg Pd −1 , and a high Faraday efficiency (FE) of 96.4% toward acetic acid. COMSOL finite element simulations confirm that the unique nanotips could induce a local electric field due to the accumulation of positive charges in the nanotips, resulting in enrichment of OH - at the catalyst surface to promote the formation of Pd−OH ads , a species required by ethanol dehydrogenation. Furthermore, DFT calculations and in-situ electrochemical Fourier transform infrared spectroscopy discover that the d-band center of Pd significantly downshifts in PdCu alloy, which facilitates the desorption of the produced acetic acid. This work provides a new electrocatalytic material with high-curvature nanotips, and also clarifies how the material morphology, by inducing local electric fields, affects the interfacial microenvironment and thus the catalytic activity and selectivity.
研究领域:
电催化
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纳米材料
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表面化学
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计算化学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
HELVETICA CHIMICA ACTA
·
2025
·
IF 1.8
Sendaner Adelieti,Si-Qi Wu,Xian-Hao Wu,Rong Guo,Jian-Shan Chen,Zhi-Fang Diao,Zi-Yi Miao,Zhen-Hong Han,Ye-Yan Qin,Yuan-Gen Yao
The carbonylation of methyl nitrite (MN) to synthesize dimethyl carbonate (DMC) is a promising route, but the lack of efficient and stable catalysts remains a major challenge for large-scale applications. In this study, by adjusting the alkalinity of the initial gel, NaY zeolites with tunable acidity were synthesized, and the amount of Lewis acid sites was optimized. Appropriate amounts of Lewis acid sites facilitated the interaction between NaY zeolites and Pd species, which was beneficial for stabilizing the oxidation state of Pd and promoting CO adsorption and activation, thereby contributing to the formation of the key intermediate *COOCH3. The catalyst PdCu/NaY-1 (alkalinity in the initial gel Na2O = 9) exhibited significant improvement in catalytic performance for the synthesis of DMC, with the WTYDMC of 1604 g·kgcat-1·h-1, the conversion of CO to DMC (CCO) of 88.7%, and the DMC selectivity based on CO (SDMC/CO) up to 100%.
研究领域:
催化化学
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材料科学
·
绿色化学
✓ 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）