Correction for ‘An overview of metamaterials and their achievements in wireless power transfer’ by Kai Sun et al., J. Mater. Chem. C, 2018, DOI: 10.1039/c7tc03384b.
Correction for ‘An overview of metamaterials and their achievements in wireless power transfer’ by Kai Sun et al., J. Mater. Chem. C, 2018, DOI: 10.1039/c7tc03384b.
Selective oxidation of methane to oxygenates with O 2 under mild conditions remains a great challenge. Here we report a ZSM-5 (Z-5) supported PdCu bimetallic catalyst (PdCu/Z-5) for methane conversion to oxygenates by...
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Selective oxidation of methane to oxygenates with O 2 under mild conditions remains a great challenge. Here we report a ZSM-5 (Z-5) supported PdCu bimetallic catalyst (PdCu/Z-5) for methane conversion to oxygenates by reacting with O 2 in the presence of H 2 at low temperature (120 °C). Benefiting from the co-existence of PdO nanoparticles and Cu single atoms via tandem catalysis, the PdCu/Z-5 catalyst exhibited a high oxygenates yield of 1178 mmol g −1 Pd h −1 (mmol of oxygenates per gram Pd per hour) and at the same time high oxygenates selectivity of up to 95 %. Control experiments and mechanistic studies revealed that PdO nanoparticles promoted the in situ generation of H 2 O 2 from O 2 and H 2 , while Cu single atoms not only accelerated the activation of H 2 O 2 for the generation of abundant hydroxyl radicals (⋅OH) from H 2 O 2 decomposition, but also enabled the homolytic cleavage of CH 4 by ⋅OH to methyl radicals (⋅CH 3 ). Subsequently, the ⋅OH reacted quickly with the ⋅CH 3 to form CH 3 OH with high selectivity.
A single-atom Pt 1 /CeO 2 catalyst formed by atom trapping (AT, 800 °C in air) shows excellent thermal stability but is inactive for CO oxidation at low temperatures owing to over-stabilization of Pt 2+ in a high...
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A single-atom Pt 1 /CeO 2 catalyst formed by atom trapping (AT, 800 °C in air) shows excellent thermal stability but is inactive for CO oxidation at low temperatures owing to over-stabilization of Pt 2+ in a highly symmetric square-planar Pt 1 O 4 coordination environment. Reductive activation to form Pt nanoparticles (NPs) results in enhanced activity; however, the NPs are easily oxidized, leading to drastic activity loss. Herein we show that tailoring the local environment of isolated Pt 2+ by thermal-shock (TS) synthesis leads to a highly active and thermally stable Pt 1 /CeO 2 catalyst. Ultrafast shockwaves (>1200 °C) in an inert atmosphere induced surface reconstruction of CeO 2 to generate Pt single atoms in an asymmetric Pt 1 O 4 configuration. Owing to this unique coordination, Pt 1 δ+ in a partially reduced state dynamically evolves during CO oxidation, resulting in exceptional low-temperature performance. CO oxidation reactivity on the Pt 1 /CeO 2 _TS catalyst was retained under oxidizing conditions.
Three-dimensionally ordered macroporous (3DOM) materials have aroused tremendous interest in solar light to energy conversion, sustainable and renewable products generation, and energy storage fields owing to their co...
Three-dimensionally ordered macroporous (3DOM) materials have aroused tremendous interest in solar light to energy conversion, sustainable and renewable products generation, and energy storage fields owing to their convenient mass transfer channels, high surface area, enhanced interaction between matter and light, plentiful reactive sites as well as tunable composition. In this review, the state-of-the-art 3DOM materials as well as their preparation methods and the relevant applications including photo/electrocatalytic sustainable energy conversion, solar cells, Li ion batteries and supercapacitor are thoroughly outlined. Meanwhile, the unique merits and mechanisms for 3DOM materials in various applications are revealed and discussed in depth. Moreover, the strategies for designing 3DOM materials and the enhanced performance for applications are correlated, which can be significantly valuable to help readers to promptly acquire the comprehensive knowledge and to inspire some new ideas in developing 3DOM materials for further improved performances. Finally, the challenges and perspectives of 3DOM materials for sustainable energy conversion/production, solar cells and energy storage fields are outlooked. We sincerely look forward to that this critical review can facilitate the fast developments in designing highly efficient 3DOM materials and the relevant applications.
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