Emerging applications of MXene materials in CO2 photocatalysis

Shen, Jiahui; Wu, Zhiyi; Li, Chaoran; Zhang, Chengcheng; Genest, Alexander; Rupprechter, Günther; He, Le

doi:10.1016/j.flatc.2021.100252

Cited by 41 publications

(17 citation statements)

References 92 publications

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“…We performed CO 2 temperature-programmed desorption (TPD) experiments over Ru/Mo 2 TiC 2 , Ru-NP/Mo 2 TiC 2 and Ru/SiO 2 catalysts. 57 Both MXene-supported samples exhibited enhanced adsorption and activation of CO 2 , as revealed by larger peak areas and higher complete desorption temperatures ( Figure S25 ). It is more likely that the active sites for CO 2 hydrogenation locate at the Ru surface and the catalytic activity is mainly determined by the number of active sites and the hydrogenation ability of different Ru catalysts.…”

Section: Resultsmentioning

confidence: 99%

Mo₂TiC₂ MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift

Shen

et al. 2022

ACS Nano

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Driving metal-cluster-catalyzed high-temperature chemical reactions by sunlight holds promise for the development of negative-carbon-footprint industrial catalysis, which has yet often been hindered by the poor ability of metal clusters to harvest and utilize the full spectrum of solar energy. Here, we report the preparation of Mo2TiC2 MXene-supported Ru clusters (Ru/Mo2TiC2) with pronounced broadband sunlight absorption ability and high sintering resistance. Under illumination of focused sunlight, Ru/Mo2TiC2 can catalyze the reverse water–gas shift (RWGS) reaction to produce carbon monoxide from the greenhouse gas carbon dioxide and renewable hydrogen with enhanced activity, selectivity, and stability compared to their nanoparticle counterparts. Notably, the CO production rate of MXene-supported Ru clusters reached 4.0 mol·gRu –1·h–1, which is among the best reported so far for photothermal RWGS catalysts. Detailed studies suggest that the production of methane is kinetically inhibited by the rapid desorption of CO from the surface of the Ru clusters.

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Section: Resultsmentioning

confidence: 99%

Mo₂TiC₂ MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift

Shen

et al. 2022

ACS Nano

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“…Currently, researchers are seeking to develop photocatalysts through bandgap modulation, especially for TiO 2 . In recent years, MXene materials have been discovered, which are used as photocatalysts for semiconductors, as they enhance and activate CO 2 absorption by reducing photocorrosion and accelerating charge separation [20]. This novel 2D nanostructure material (MXenes), synthesized by selectively etching X element from ternary metal carbides, was used as a helper, with the Pd50-Ru50 catalyst, to convert CO 2 to CH 3 OH, where Pd50-Ru50/MXene demonstrated a 78% conversion efficiency of CO 2 with a 76% methanol crop [114].…”

Section: Photocatalytic Applications Of Carbon Dioxide Conversionmentioning

confidence: 99%

“…However, converting carbon dioxide to other products needs high energy, as CO 2 is highly stable and relatively inert, which is reflected by its bond dissociation energy (393.5 kJ/mol) [18,19]. Several carbon dioxide conversion processes have been developed, including photocatalysis [20], plasma catalysis [21], and electrochemical catalysis [22]. Therefore, there was a boost in interest in employing catalysts in conversion processes.…”

Section: Introductionmentioning

confidence: 99%

Metal Oxides as Catalyst/Supporter for CO2 Capture and Conversion, Review

et al. 2022

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Various carbon dioxide (CO2) capture materials and processes have been developed in recent years. The absorption-based capturing process is the most significant among other processes, which is widely recognized because of its effectiveness. CO2 can be used as a feedstock for the production of valuable chemicals, which will assist in alleviating the issues caused by excessive CO2 levels in the atmosphere. However, the interaction of carbon dioxide with other substances is laborious because carbon dioxide is dynamically relatively stable. Therefore, there is a need to develop types of catalysts that can break the bond in CO2 and thus be used as feedstock to produce materials of economic value. Metal oxide-based processes that convert carbon dioxide into other compounds have recently attracted attention. Metal oxides play a pivotal role in CO2 hydrogenation, as they provide additional advantages, such as selectivity and energy efficiency. This review provides an overview of the types of metal oxides and their use for carbon dioxide adsorption and conversion applications, allowing researchers to take advantage of this information in order to develop new catalysts or methods for preparing catalysts to obtain materials of economic value.

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“…The MXene cocatalyst increases the photocatalytic CO 2 reduction performance of semiconductors by photocorrosion inhibition of catalysts, improvement in the charge carrier separation, and enhanced adsorption and activation of CO 2 molecules. ,− MXenes spontaneously capture CO 2 without requiring high pressure or temperature . In addition, MXenes can capture CO 2 even in the presence of moisture because of their preferential interaction with CO 2 over H 2 O .…”

Section: Co2 Reduction Activitymentioning

confidence: 99%

A Review on MXene Synthesis, Stability, and Photocatalytic Applications

et al. 2022

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Photocatalytic water splitting, CO2 reduction, and pollutant degradation have emerged as promising strategies to remedy the existing environmental and energy crises. However, grafting of expensive and less abundant noble-metal cocatalysts on photocatalyst materials is a mandatory practice to achieve enhanced photocatalytic performance owing to the ability of the cocatalysts to extract electrons efficiently from the photocatalyst and enable rapid/enhanced catalytic reaction. Hence, developing highly efficient, inexpensive, and noble-metal-free cocatalysts composed of earth-abundant elements is considered as a noteworthy step toward considering photocatalysis as a more economical strategy. Recently, MXenes (two-dimensional (2D) transition-metal carbides, nitrides, and carbonitrides) have shown huge potential as alternatives for noble-metal cocatalysts. MXenes have several excellent properties, including atomically thin 2D morphology, metallic electrical conductivity, hydrophilic surface, and high specific surface area. In addition, they exhibit Gibbs free energy of intermediate H atom adsorption as close to zero and less than that of a commercial Pt-based cocatalyst, a Fermi level position above the H2 generation potential, and an excellent ability to capture and activate CO2 molecules. Therefore, there is a growing interest in MXene-based photocatalyst materials for various photocatalytic events. In this review, we focus on the recent advances in the synthesis of MXenes with 2D and 0D morphologies, the stability of MXenes, and MXene-based photocatalysts for H2 evolution, CO2 reduction, and pollutant degradation. The existing challenges and the possible future directions to enhance the photocatalytic performance of MXene-based photocatalysts are also discussed.

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Emerging applications of MXene materials in CO2 photocatalysis

Cited by 41 publications

References 92 publications

Mo₂TiC₂ MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift

Mo₂TiC₂ MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift

Metal Oxides as Catalyst/Supporter for CO2 Capture and Conversion, Review

A Review on MXene Synthesis, Stability, and Photocatalytic Applications

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Emerging applications of MXene materials in CO2 photocatalysis

Cited by 41 publications

References 92 publications

Mo2TiC2 MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift

Mo2TiC2 MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift

Metal Oxides as Catalyst/Supporter for CO2 Capture and Conversion, Review

A Review on MXene Synthesis, Stability, and Photocatalytic Applications

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Product

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Mo₂TiC₂ MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift

Mo₂TiC₂ MXene-Supported Ru Clusters for Efficient Photothermal Reverse Water–Gas Shift