Cu
                x
              O self-assembled mesoporous microspheres with effective surface oxygen vacancy and their room temperature NO2 gas sensing performance

Liu, Siyuan; Wang, Mengting; Li, Chaozheng; Li, Jiajia; Xu, Meng; Liu, Jia; Zhang, Jiatao

doi:10.1007/s40843-017-9224-x

Cited by 24 publications

(13 citation statements)

References 36 publications

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“…Furthermore, it is noted that comparing with those of Ir NPs/m‐WO 3 and Ir/non‐m‐WO 3 , the binding energies of the Ir 0 peaks in Ir 1 /m‐WO 3 shifted to the higher‐energy side, indicating that single Ir atoms are slightly positively charged, which should be caused by the electron transfer between single Ir atoms and the WO 3 support, indicating a strong synergistic interaction between them. In the case of O1s XPS spectra (Figure 5d), the observed peak at 530.2 eV in all the cases is attributed to the surface lattice oxygen in WO 3 [33,34] …”

Section: Resultsmentioning

confidence: 90%

Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Jiang

Liu

et al. 2021

ChemCatChem

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Under oxygen‐rich conditions, achieving a selective and efficient reduction of NO by CO is always challenging. Here, we report the synthesis of the catalyst consisting of single Ir atoms anchored on mesoporous WO3 (denoted as Ir1/m‐WO3) using a facile template method followed by wet impregnation. X‐ray diffraction and transmission electron microscope studies indicated that the Ir atoms were distributed uniformly on the internal surface of m‐WO3. When tested for the reduction of NO by CO, the Ir1/m‐WO3 catalyst with a low Ir loading of 0.28 wt % exhibited excellent catalytic performance in the presence of 2 vol % O2 (volume ratio of CO to O2 being 1 : 10), achieving a NO conversion of 73 % and N2 selectivity of 100 % at 350 °C. In particular, its turnover frequency (TOF) value reached 0.30 s−1 at 200 °C, which is six times higher than that of the catalyst with Ir nanoparticles supported on mesoporous WO3 (0.05 s−1). The superior catalytic performance of Ir1/m‐WO3 is attributed to the formation of the isolated Ir atoms and the more newly generated Ir‐WO3 interfaces that can promote the adsorption and activation of NO, and the presence of accessible mesopores in m‐WO3 that facilitates the mass transfer of NO and CO. This study brings a new fundamental understanding of active sites in Ir‐based catalysts for the CO+NO reaction and provides a new way to the design and synthesis of single‐atom catalysts, especially precious metal catalysts for emissions control.

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Section: Resultsmentioning

confidence: 90%

Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Jiang

Liu

et al. 2021

ChemCatChem

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“…[ 23 ] (b) Schematic illustration of the formation of Cu x O SMMs. [ 33 ] (c) Schematic illustration of the formation of tungsten oxide nanosheets with oxygen vacancies. [ 34 ]…”

Section: Oxygen Defects Tailoring In Nanostructured Metal Oxidesmentioning

confidence: 99%

“…synthesized a series of Cu x O self‐assembled mesoporous microspheres (SMMs) by a facile liquid phase approach (Figure 1b). [ 33 ] Sodium borohydride (NaBH 4 ), as a strong reducing agent, reacts with hydroxyl ion of water and releases electrons. With increasing amount of water and reaction time, the structures of the Cu x O SMMs evolved from spherical ones to virus‐like ones.…”

Section: Oxygen Defects Tailoring In Nanostructured Metal Oxidesmentioning

confidence: 99%

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Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†

Ding

Liu

et al. 2020

Chin. J. Chem.

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Defect engineering has been the most promising strategy to modulate the surface microstructure and electronic structure of the metal oxides, which will govern the efficiency of a given oxide for the applications in heterogeneous catalysis, energy storage and conversion fields, and gas sensing. This review summarizes recent research advances on understanding the role of oxygen vacancies of the metal oxides in gas sensing. First, different strategies for oxygen vacancy productions are summarized and compared. Then, the proper characterization techniques for oxygen vacancy are introduced. Importantly, the structure-activity relationships between vacancy engineering and gas sensing ability are further illustrated coupling the experimental results and theoretical studies. Finally, the key challenges and prospects regarding defect engineering in gas sensing are highlighted. Wenjie Ding (left) obtained his bachelor degree from Beijing Forestry University in 2018. Currently, he is pursuing his master degree under the supervision of Associate Professor Jiajia Liu in Beijing Instituted of Technology, China. His current research interests mainly focus on the synthesis of nanomaterials for the application of gas sensing. Dr. Jiajia Liu (middle) received her PhD degree in 2010 from Department of Chemical & Biomolecular Engineering of National University of Singapore, Singapore. Currently, she is Associate Professor in School of Materials and Engineering, Beijing Institute of Technology, China. Her current research interest is the development of metal oxide nanostructures and their applications in sensor, catalysis, and optoelectronics. Jiatao Zhang (right) was born in 1975. He earned his PhD from the Department of Chemistry, Tsinghua University, in 2006. Currently, he is Xu Teli Professor in the School of Materials and Engineering, BIT. He was awarded the Excellent Young Scientist foundation of NSFC in 2013. He also serves as the director of Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications. His current research interest is inorganic chemistry of semiconductor-based hybrid nanostructures with novel optical, electronic properties for the applications in energy conversion and storage, catalysis, optoelectronics and biology.

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“…None of NH 3 , CO, or NO can be detected by the human senses. It is very important to have a means of selectively and rapidly detecting automotive exhaust gas in the atmosphere [13][14][15]. However, traditional automotive exhaust gas sensors incur problems associated with their large size, while their bulky integrated power units prevent real-time monitoring [16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

A self-powered gas sensor based on PDMS/Ppy triboelectric-gas-sensing arrays for the real-time monitoring of automotive exhaust gas at room temperature

Zhang

Zhao

et al. 2019

Sci. China Mater.

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A new self-powered active gas sensor for realtime monitoring of automotive exhaust gas was devised. The pipe-shaped device was fabricated from polydimethylsiloxane/ polypyrrole (PDMS/Ppy) triboelectric gas-sensing unit arrays. The gas-sensing units can actively convert the mechanical energy of gas flow into a triboelectric current. The output current signal depends on the species and concentrations of the target chemical gases (CO, NH 3 , NO) in the gas flow, and thus can be used as a sensing signal. The device consists of seven gas-sensing units with different Ppy derivatives. As the different sensing units respond to the gases in different ways, the device can differentiate between gas species. The working mechanism is attributed to the coupling effect between the triboelectric effect of PDMS/Ppy and the gas-sensing properties of Ppy. The device can be installed in the tailpipe of an automobile, and can thus analyze the exhaust gas in real time without the need for any external electrical power. The results of the present study spur a new research direction for the development of automotive exhaust gas monitoring systems, thus playing an important role in the detection of air pollution.

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Cu x O self-assembled mesoporous microspheres with effective surface oxygen vacancy and their room temperature NO2 gas sensing performance

Cited by 24 publications

References 36 publications

Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†

A self-powered gas sensor based on PDMS/Ppy triboelectric-gas-sensing arrays for the real-time monitoring of automotive exhaust gas at room temperature

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Cu x O self-assembled mesoporous microspheres with effective surface oxygen vacancy and their room temperature NO2 gas sensing performance

Cited by 24 publications

References 36 publications

Single Ir Atoms Anchored on Ordered Mesoporous WO3 Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Single Ir Atoms Anchored on Ordered Mesoporous WO3 Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges†

A self-powered gas sensor based on PDMS/Ppy triboelectric-gas-sensing arrays for the real-time monitoring of automotive exhaust gas at room temperature

Contact Info

Product

Resources

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Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Single Ir Atoms Anchored on Ordered Mesoporous WO₃ Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†