Size-activity relationship of iridium particles supported on silica for the total oxidation of volatile organic compounds (VOCs)

Schick, Lukas; Sanchis, Rut; González-Alfaro, Vicenta; Agouram, Saïd; López, José Manuel; Torrente‐Murciano, Laura; Garcı́a, Tomás; Solsona, Benjamín

doi:10.1016/j.cej.2019.02.087

Cited by 58 publications

(38 citation statements)

References 48 publications

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“…Moreover, HR‐TEM image of the IrO 2 /TiO 2 NSAs (Figure 2j) showed that the measured lattice distances of 0.32, 0.26, and 0.22 nm can be indexed to the (110), (101), and (111) planes of the IrO 2 , respectively. [ 33 ] The corresponding selected area electron diffraction (SAED) pattern of the IrO 2 /TiO 2 NSAs presented a series of concentric diffraction rings, which are assignable to the crystal planes of IrO 2 and TiO 2 , agreeing well with the XRD results and affirming the polycrystalline nature of the IrO 2 /TiO 2 nanosheet structure (Figure 2k). [ 34 ]…”

Section: Resultssupporting

confidence: 66%

Rational Surface and Interfacial Engineering of IrO₂/TiO₂ Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation

Wang

Xue

Zhang

2021

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The chlorine evolution reaction (CER) is a critical and commercially valuable electrochemical reaction in industrial‐scale utilization, including the Chlor‐alkali industry, seawater electrolysis, and saline wastewater treatment. Aiming at boosting CER electrocatalysis, hybrid IrO2/TiO2 nanosheet arrays (NSAs) with rational surface and interfacial tuning strategies are proposed in this study. The IrO2/TiO2 NSAs exhibit superb CER electrocatalytic activity with a low overpotential (44 mV) at 10 mA cm−2, low Tafel slope of 40 mV dec−1, high CER selectivity (95.8%), and long‐term durability, outperforming most of the existing counterparts. The boosting mechanism is proposed that the aerophobic/hydrophilic surface engineering and interfacial electronic structure tuning of IrO2/TiO2 are beneficial for the Cl− mass‐transfer, Cl2 release, and Volmer–Heyvrosky kinetics during the CER. Practical saline wastewater treatment by using the IrO2/TiO2 NSAs electrode is further conducted, demonstrating it has a higher p‐nitrophenol degradation ratio (95.10% in 60 min) than that of other electrodes. The rational surface and interfacial engineering of IrO2/TiO2 NSAs can open up a new way to design highly efficient electrocatalysts for industrial application and environmental remediation.

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Section: Resultssupporting

confidence: 66%

Rational Surface and Interfacial Engineering of IrO₂/TiO₂ Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation

Wang

Xue

Zhang

2021

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“…The high‐resolution TEM (HRTEM) image of an ex‐solved particle obtained during the reduction process and the corresponding fast Fourier transform (FFT) pattern verify that the particle is metallic Ir with a face‐centered cubic structure (Figure 2f). [ 20 ] However, when exposed to ambient air, the Ir NPs were partially oxidized, as confirmed by HRTEM and FFT, which showed that the NP became IrO 2 with a tetragonal structure (Figure S5, Supporting Information). EDS mapping and line scan clearly confirm that the ex‐solved particles contain Ir (Figure 2g,h and see Figure S6 in the Supporting Information).…”

Section: Figurementioning

confidence: 93%

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

Jang

Kim

et al. 2020

Advanced Materials

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Supported catalysts, in which metal nanoparticles (NPs) are distributed on oxide supports, are widely used in a variety of industrial processes, including in catalysis, [1] sensing, [2] and renewable energy. [3] To improve the reactivity, costeffectiveness, and durability of catalysts, decreasing their particle size to ensure uniform dispersion on the support and to suppress their aggregation during operation, particularly at high temperatures (>500 °C) is of utmost importance. Thus far, not only conventional impregnation and coprecipitation approaches but also numerous new synthesis and dispersion techniques have been actively studied. [4] Recently, the spontaneous growth of metal NPs on the surface of a host oxide, called "ex-solution," has attracted much attention as a new route to obtain supported catalysts. [5] It is based on the phenomenon that certain cations in a complex oxide lattice selectively precipitate on the surface when the oxide is partially reduced at high temperatures. [6] In particular, when catalytically active and highly reducible transition metals are used as dopants, metal NPs can be uniformly dispersed on the oxide surface with only a single heat treatment. [7] Furthermore, the metal NPs produced by ex-solution are strongly bound to the host oxide and thus have excellent thermal and chemical stability. [8,9] Accordingly, thanks to these advantages, the ex-solution process is now being applied in high-temperature chemical and electrochemical applications, such as solid oxide fuel cells, [10] electrolyzers, [11] and oxidation catalysts. [12] However, the high-temperature heat treatment required to obtain ex-solved particles is a substantial barrier that significantly limits the use of this process in a wider range of applications. To achieve high catalytic reactivity, not only the metal particles but also the oxide support should have a large specific surface area, whereas at high temperatures, sintering between the oxide supports often occurs, deactivating the catalysts. Therefore, it is necessary to develop a strategy for activating the ex-solution process at a temperature low enough that the nanoscale oxide supports do not aggregate. In this regard, Irvine et al. proposed facilitating the extrusion of B-site cations The ex-solution phenomenon, a central platform for growing metal nanoparticles on the surface of host oxides in real time with high durability and a fine distribution, has recently been applied to various scientific and industrial fields, such as catalysis, sensing, and renewable energy. However, the high-temperature processing required for ex-solutions (>700 °C) limits the applicable material compositions and has hindered advances in this technique. Here, an unprecedented approach is reported for lowtemperature particle ex-solution on important nanoscale binary oxides. WO 3 with a nanosheet structure is selected as the parent oxide, and Ir serves as the active metal species that produces the ex-solved metallic particles. Importantly, Ir doping facilitates a phase transition ...

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“…Other oxides were also investigated, for example, Schick et al [55] synthesized iridium particles supported on silica for the total oxidation of VOCs, and the catalytic activity increases when the iridium oxide particle size decreases.…”

Section: Methodsmentioning

confidence: 99%

A Review on Catalytic Nanomaterials for Volatile Organic Compounds VOC Removal and Their Applications for Healthy Buildings

Shah

2019

Nanomaterials

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In order to improve the indoor air quality, volatile organic compounds (VOCs) can be removed via an efficient approach by using catalysts. This review proposed a comprehensive summary of various nanomaterials for thermal/photo-catalytic removal of VOCs. These representative materials are mainly categorized as carbon-based and metallic oxides materials, and their morphologies, synthesis techniques, and performances have been explained in detail. To improve the indoor and outdoor air quality, the catalytic nanomaterials can be utilized for emerging building applications such as VOC-reduction coatings, paints, air filters, and construction materials. Due to the characteristics of low cost, non-toxic and high chemical stability, metallic oxides such as TiO2 and ZnO have been widely investigated for decades and dominate the application market of VOC-removal catalyst in buildings. Since other catalysts also showed brilliant performance and have been theoretically researched, they can be potential candidates for applications in future healthy buildings. This review will contribute to further knowledge and greater potential applications of promising VOC-reducing catalytic nanomaterials on healthier buildings for a better indoor and outdoor environment well-being.

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Size-activity relationship of iridium particles supported on silica for the total oxidation of volatile organic compounds (VOCs)

Cited by 58 publications

References 48 publications

Rational Surface and Interfacial Engineering of IrO₂/TiO₂ Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation

Rational Surface and Interfacial Engineering of IrO₂/TiO₂ Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

A Review on Catalytic Nanomaterials for Volatile Organic Compounds VOC Removal and Their Applications for Healthy Buildings

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Size-activity relationship of iridium particles supported on silica for the total oxidation of volatile organic compounds (VOCs)

Cited by 58 publications

References 48 publications

Rational Surface and Interfacial Engineering of IrO2/TiO2 Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation

Rational Surface and Interfacial Engineering of IrO2/TiO2 Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

A Review on Catalytic Nanomaterials for Volatile Organic Compounds VOC Removal and Their Applications for Healthy Buildings

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Product

Resources

About

Rational Surface and Interfacial Engineering of IrO₂/TiO₂ Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation

Rational Surface and Interfacial Engineering of IrO₂/TiO₂ Nanosheet Arrays toward High‐Performance Chlorine Evolution Electrocatalysis and Practical Environmental Remediation