排序方式: 共有20条查询结果,搜索用时 31 毫秒
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(6):1670-1674
An area‐selective atomic layer deposition (AS‐ALD) method is described to construct oxide nanotraps to anchor Pt nanoparticles (NPs) on Al2O3 supports. The as‐synthesized catalysts have exhibited outstanding room‐temperature CO oxidation activity, with a significantly lowered apparent activation energy (ca. 22.17 kJ mol−1) that is half that of pure Pt catalyst with the same loading. Furthermore, the structure shows excellent sintering resistance with the high catalytic activity retention up to 600 °C calcination. The key feature of the oxide nanotraps lies in its ability to anchor Pt NPs via strong metal–oxide interactions while still leaving active metal facets exposed. Our reported method for forming such oxide structure with nanotraps shows great potential for the simultaneous enhancement of thermal stability and activity of precious metal NPs. 相似文献
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Haojie Zhang Dr. Dirk J. Hagen Prof. Xiaopeng Li Dr. Andreas Graff Dr. Frank Heyroth Dr. Bodo Fuhrmann Dr. Ilya Kostanovskiy Dr. Stefan L. Schweizer Dr. Francesco Caddeo Prof. A. Wouter Maijenburg Prof. Stuart Parkin Prof. Ralf B. Wehrspohn 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(39):17324-17329
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Huimei Duan Rui You Shutao Xu Zhaorui Li Kun Qian Tian Cao Weixin Huang Xinhe Bao 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(35):12171-12176
Supported Pd catalysts are active in catalyzing the highly exothermic methane combustion reaction but tend to be deactivated owing to local hyperthermal environments. Herein we report an effective approach to stabilize Pd/SiO2 catalysts with porous Al2O3 overlayers coated by atomic layer deposition (ALD). 27Al magic angle spinning NMR analysis showed that Al2O3 overlayers on Pd particles coated by the ALD method are rich in pentacoordinated Al3+ sites capable of strongly interacting with adjacent surface PdOx phases on supported Pd particles. Consequently, Al2O3‐decorated Pd/SiO2 catalysts exhibit active and stable PdOx and Pd–PdOx structures to efficiently catalyze methane combustion between 200 and 850 °C. These results reveal the unique structural characteristics of Al2O3 overlayers on metal surfaces coated by the ALD method and provide a practical strategy to explore stable and efficient supported Pd catalysts for methane combustion. 相似文献
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Jin Xie Xiahui Yao Qingmei Cheng Ian P. Madden Paul Dornath Chun‐Chih Chang Wei Fan Dunwei Wang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(14):4373-4377
Enabled by the reversible conversion between Li2O2 and O2, Li–O2 batteries promise theoretical gravimetric capacities significantly greater than Li‐ion batteries. The poor cycling performance, however, has greatly hindered the development of this technology. At the heart of the problem is the reactivity exhibited by the carbon cathode support under cell operation conditions. One strategy is to conceal the carbon surface from reactive intermediates. Herein, we show that long cyclability can be achieved on three dimensionally ordered mesoporous (3DOm) carbon by growing a thin layer of FeOx using atomic layer deposition (ALD). 3DOm carbon distinguishes itself from other carbon materials with well‐defined pore structures, providing a unique material to gain insight into processes key to the operations of Li–O2 batteries. When decorated with Pd nanoparticle catalysts, the new cathode exhibits a capacity greater than 6000 mAh gcarbon−1 and cyclability of more than 68 cycles. 相似文献