<i>In Situ</i> TEM Technique Revealing the Deactivation Mechanism of Bimetallic Pd–Ag Nanoparticles in Hydrogen Sensors

Wang, Xueqing; Li, Ming; Xu, Pengcheng; Chen, Ying; Yu, Haitao; Li, Xinxin

doi:10.1021/acs.nanolett.1c05018

Cited by 37 publications

(23 citation statements)

References 41 publications

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“…Bimetallic Alloys: Among various noble metal-based bimetallic catalysts (PdAu, PtAu, PdPt, PdCu, AuCu, PtCo, etc.) studied for a variety of catalytic reactions, [199] PtCo is perhaps the most studied catalyst system due to its synergistic catalytic properties for many reactions, especially for fuel cell ORR, which will be discussed in a later section. In an earlier in situ HAADF-STEM study of Pt 3 Co NP after oxygen annealing at 720 °C, [145] a counter-intuitive oxygen-driven process for the core-shell formation is revealed at elevated temperature under oxygen at atmospheric pressure.…”

Section: Multimetallic Catalystsmentioning

confidence: 99%

Insights into Heterogeneous Catalysts under Reaction Conditions by In Situ/Operando Electron Microscopy

Cheng

Wang

Chen

et al. 2022

Advanced Energy Materials

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The advancement of clean energy and environment depends strongly on the development of efficient catalysts in a wide range of heterogeneous catalytic reactions, which has benefited from transmission electron microscopic techniques in determining the atomic‐scale morphologies and structures. However, it is the morphology and structure under the catalytic reaction conditions that determine the performance of the catalyst, which has captured a surge of interest in developing and applying in situ/operando transmission electron microscopic techniques in heterogeneous catalysis. The major theme of this review is to highlight some of the most recent insights into heterogeneous catalysts under the relevant reaction conditions using in situ/operando transmission electron microscopic techniques. Rather than a comprehensive overview of the basic principles of in situ/operando techniques, this review focuses on the insights into the atomic‐scale/nanoscale details of various catalysts ranging from single‐component to multicomponent catalysts under heterogeneous catalytic, electrocatalytic, and photocatalytic reaction conditions involving both gas–solid and liquid–solid interfaces. This focus is coupled with discussions of the correlation of the atomic, molecular, and nanoscale morphology, composition, and structure with the catalytic properties under the reaction conditions, shining light on the challenges and opportunities in design of nanostructured catalysts for clean and sustainable energy applications.

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Section: Multimetallic Catalystsmentioning

confidence: 99%

Insights into Heterogeneous Catalysts under Reaction Conditions by In Situ/Operando Electron Microscopy

Cheng

Wang

Chen

et al. 2022

Advanced Energy Materials

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“…Because of the high surface energy of noble metal NPs, they tend to aggregate quickly at higher operating temperatures, limiting their long-term stability. Wang et al investigated the long-term stability of the H 2 sensor of the bimetallic Pd–Ag alloy nanocatalyst on the ZnO surface by gas-cell in situ transmission electron microscopy (TEM) at higher operating temperature (300 and 500 °C) . They found that at higher operating temperatures, Pd–Ag alloy NPs get coalesced and segregated, resulting in a decline in their catalytic activities and sensing performance.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al investigated the long-term stability of the H 2 sensor of the bimetallic Pd−Ag alloy nanocatalyst on the ZnO surface by gas-cell in situ transmission electron microscopy (TEM) at higher operating temperature (300 and 500 °C). 24 They found that at higher operating temperatures, Pd−Ag alloy NPs get coalesced and segregated, resulting in a decline in their catalytic activities and sensing performance. Therefore, to solve this issue, a core− shell architecture was found to be an effective way to protect the metallic core from being aggregated by a suitable MOS shell.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stable AgPd@ZnO Bimetallic Alloy Nanoparticles for Ethanol Sensors with Long-Term Stability

Ahemad

Kim

et al. 2022

ACS Appl. Nano Mater.

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Bimetallic alloy nanoparticles (NPs) typically provide some unique properties in gas sensing due to the synergistic effects that arise from the two distinct metals, especially selective catalytic oxidation of hazardous volatile organic compounds. However, their practical uses are being held back by the high catalyst cost and the deterioration of catalytic capabilities at elevated temperatures. In this work, extremely thermally stable ZnO-supported AgPd bimetallic alloy core–shell NPs were synthesized, demonstrating resistance to surface oxidation due to the synergistic effect of Ag and Pd atoms. The AgPdalloy@ZnO core–shell NPs outperform the pristine ZnO and Pd@ZnO NPs in ethanol sensing, with a response of 704.08 to 100 ppm ethanol at 300 °C. Besides, the sensor demonstrates excellent selectivity, anti-interfering response, repeatability, long-term stability, and humidity effect. The lattice mismatch, upshifts in the d-band center, and oxidation resistance behavior of AgPdalloy ameliorate their electronic structure, which enhances the catalytic properties and the gas sensing performances in AgPdalloy@ZnO NPs. Most importantly, compared to other noble metal NPs, Ag is very inexpensive and cost-effective, which is a great advantage from an economic perspective.

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“…Recently, Lu et al reported another Ti-based composite oxide sensing electrode, which has a detection limit of 500 ppb for acetylene [ 29 ]. For on-site detection of trace gases, such as acetylene, miniature gas sensors with high sensing performance and low power consumption have attracted much attention [ 31 , 32 , 33 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive MEMS Sensor Using Bimetallic Pd–Ag Nanoparticles as Catalyst for Acetylene Detection

Yuan¹,

Qiao

Yao

et al. 2022

Sensors

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Acetylene detection plays an important role in fault diagnosis of power transformers. However, the available dissolved gas analysis (DGA) techniques have always relied on bulky instruments and are time-consuming. Herein, a high-performance acetylene sensor was fabricated on a microhotplate chip using In2O3 as the sensing material. To achieve high sensing response to acetylene, Pd–Ag core-shell nanoparticles were synthesized and used as catalysts. The transmission electron microscopy (TEM) image clearly shows that the Ag shell is deposited on one face of the cubic Pd nanoseeds. By loading the Pd–Ag bimetallic catalyst onto the surface of In2O3 sensing material, the acetylene sensor has been fabricated for acetylene detection. Due to the high catalytic performance of Pd–Ag bimetallic nanoparticles, the microhotplate sensor has a high response to acetylene gas, with a limit of detection (LOD) of 10 ppb. In addition to high sensitivity, the fabricated microhotplate sensor exhibits satisfactory selectivity, good repeatability, and fast response to acetylene. The high performance of the microhotplate sensor for acetylene gas indicates the application potential of trace acetylene detection in power transformer fault diagnosis.

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In Situ TEM Technique Revealing the Deactivation Mechanism of Bimetallic Pd–Ag Nanoparticles in Hydrogen Sensors

Cited by 37 publications

References 41 publications

Insights into Heterogeneous Catalysts under Reaction Conditions by In Situ/Operando Electron Microscopy

Insights into Heterogeneous Catalysts under Reaction Conditions by In Situ/Operando Electron Microscopy

Thermally Stable AgPd@ZnO Bimetallic Alloy Nanoparticles for Ethanol Sensors with Long-Term Stability

Highly Sensitive MEMS Sensor Using Bimetallic Pd–Ag Nanoparticles as Catalyst for Acetylene Detection

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