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  • Royal Society of Chemistry (RSC)  (3)
  • 1
    Online Resource
    Online Resource
    In situ spectroscopic studies of the effect of water on the redox cycle of Cu ions in Cu-SSZ-13 during selective catalytic reduction of NO x
    Royal Society of Chemistry (RSC) ; 2022
    In:  Chemical Communications Vol. 58, No. 46 ( 2022), p. 6610-6613
    Details
    In: Chemical Communications, Royal Society of Chemistry (RSC), Vol. 58, No. 46 ( 2022), p. 6610-6613
    Abstract: The effect of water on the NH 3 -assisted selective catalytic reduction of NO x (NH 3 -SCR) has been largely neglected, despite the inevitable presence of water vapor in real emissions produced by fuel combustion. In this work, we investigated the role of water in the behavior of active Cu 2+ ions in Cu-SSZ-13 in the NH 3 -SCR reaction. The addition of water to the reactant feed leads to significantly increased NO x reduction over the catalyst. By combining in situ DRIFTS and XANES analyses during the NH 3 -SCR reaction, we found that the redox cycle of Cu ions is promoted by the presence of water.
    Type of Medium: Online Resource
    ISSN: 1359-7345 , 1364-548X
    URL: Article
    DOI: 10.1039/D2CC01786E
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2022
    detail.hit.zdb_id: 215830-9
    detail.hit.zdb_id: 1472881-3
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  • 2
    Online Resource
    Online Resource
    Facile synthesis of porous transition metal hydroxides from a poly(4-vinyl pyridine) film by controlling pH
    Royal Society of Chemistry (RSC) ; 2023
    In:  Nanoscale Advances Vol. 5, No. 9 ( 2023), p. 2565-2572
    Details
    In: Nanoscale Advances, Royal Society of Chemistry (RSC), Vol. 5, No. 9 ( 2023), p. 2565-2572
    Abstract: Non-noble transition metal hydroxides have been widely used in electrochemical devices because of low cost and multiple redox states. In particular, self-supported porous transition metal hydroxides are used to improve the electrical conductivity, as well as achieving fast electron and mass transfer and a large effective surface area. Herein, we introduce facile synthesis of self-supported porous transition metal hydroxides using a poly(4-vinyl pyridine) (P4VP) film. We used metal cyanide as a transition metal precursor capable of forming metal hydroxide anions in aqueous solution, which is the seed for transition metal hydroxides. To increase the coordination between P4VP and the transition metal cyanide precursors, we dissolved the precursors in buffer solutions with various pH. When the P4VP film was immersed in the precursor solution with lower pH, the metal cyanide precursors were sufficiently coordinated with the protonated nitrogen in P4VP. When reactive ion etching was performed on the precursor-containing P4VP film, the P4VP region without coordination was etched out and became pores. Then, the coordinated precursors were aggregated as metal hydroxide seeds and became the metal hydroxide backbone, resulting in the formation of porous transition metal hydroxide structures. We successfully fabricated various self-supported porous transition metal hydroxides (Ni(OH) 2 , Co(OH) 2 , and FeOOH). Finally, we prepared a pseudo-capacitor based on self-supported porous Ni(OH) 2 , which showed a good specific capacitance (780 F g −1 at 5 A g −1 ).
    Type of Medium: Online Resource
    ISSN: 2516-0230
    URL: Article
    DOI: 10.1039/D3NA00076A
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2023
    detail.hit.zdb_id: 2942874-9
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  • 3
    Online Resource
    Online Resource
    Biocompatible cracked reduced graphene oxide strain sensors: enhancing implantable strain sensing performance and durability
    Royal Society of Chemistry (RSC) ; 2023
    In:  Journal of Materials Chemistry C Vol. 11, No. 25 ( 2023), p. 8405-8412
    Details
    In: Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 11, No. 25 ( 2023), p. 8405-8412
    Abstract: Implantable strain sensors that reliably detect various biomechanical signals in vivo are essential electronic devices for advanced biomedical and bioengineering technologies. However, it is a challenge to prepare soft implantable strain sensors with high linear sensitivity, good mechanical/chemical stability, and proper biological compatibility. Here, we report the preparation, mechanics, and applications of soft and implantable cracked reduced graphene oxide-based electro-mechanical strain sensors for monitoring internal tissue or organ dynamics that also address the aforementioned limitations. These skin-like strain sensors are composed of a high-quality microwaved reduced graphene oxide multilayer and a microcracked polymer substrate. By adopting both prestrain and hybrid reduction strategies, we successfully developed novel implantable graphene strain sensors that exhibit a set of unique properties, including high strain linear sensitivity (∼876.7 GF over a range of 0% to 30% strain), excellent mechanical durability (10 000 strain cycles at a strain of 20%) and chemical stability in biological fluids (a saline solution for 7 days), and excellent in vitro and in vivo biocompatibility. We also demonstrated the use of our implantable sensors for reliably measuring the strain associated with in vivo dynamic cardiac activity and for assessing preclinical cardiovascular drugs.
    Type of Medium: Online Resource
    ISSN: 2050-7526 , 2050-7534
    URL: Article
    DOI: 10.1039/D3TC01266B
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2023
    detail.hit.zdb_id: 2702245-6
    detail.hit.zdb_id: 2705156-0
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