Activated Carbon Supported Palladium Nanoparticle Catalysts Synthesized by Atomic Layer Deposition: Genesis and Evolution of Nanoparticles and Tuning the Particle Size

2015 ◽  
Vol 119 (21) ◽  
pp. 11544-11556 ◽  
Author(s):  
Ting Gong ◽  
Lijun Qin ◽  
Wei Zhang ◽  
Hong Wan ◽  
Jian Lu ◽  
...  
Keyword(s):  
Particle Size ◽  
Activated Carbon ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Palladium Nanoparticle ◽  
Nanoparticle Catalysts ◽  
Layer Deposition ◽  
Supported Palladium

Solar Hydrogen Generation by Silicon Nanowires Modified with Platinum Nanoparticle Catalysts by Atomic Layer Deposition

2013 ◽  
Vol 125 (42) ◽  
pp. 11325-11329 ◽  
Author(s):  
Pengcheng Dai ◽  
Jin Xie ◽  
Matthew T. Mayer ◽  
Xiaogang Yang ◽  
Jinhua Zhan ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Silicon Nanowires ◽  
Hydrogen Generation ◽  
Atomic Layer ◽  
Platinum Nanoparticle ◽  
Solar Hydrogen ◽  
Nanoparticle Catalysts ◽  
Layer Deposition

scholarly journals Thermal Atomic Layer Deposition of Gold Nanoparticles: Controlled Growth and Size Selection for Photocatalysis

2019 ◽  
Author(s):  
Fatemeh Sadat Minaye Hashemi ◽  
Fabio Grillo ◽  
Vikram Ravikumar ◽  
dominik Benz ◽  
Ankit Shekhar ◽  
...  
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Atomic Layer Deposition ◽  
Au Nanoparticles ◽  
Atomic Layer ◽  
Structure Property ◽  
Structure Property Relationships ◽  
Layer Deposition ◽  
Catalytically Active ◽  
Au Particle Size

Gold nanoparticles have been extensively studied for their applications in catalysis. For Au nanoparticles to be catalytically active, controlling the particle size is crucial. Here we present a low temperature (105 °C) thermal atomic layer deposition approach for depositing gold nanoparticles on TiO<sub>2</sub> with controlled size and loading using trimethylphosphino-trimethylgold (III) and two co-reactants (ozone and water) in a fluidized bed reactor. We show that the exposure time of the precursors is a variable that can be used to decouple the Au particle size from the Au loading. Longer exposures of ozone narrow the particle size distribution while longer exposures of water broaden it. By studying the photocatalytic activity of Au/TiO<sub>2</sub> nanocomposites we show how the ability to control particle size and loading independently can be used not only to enhance performance but also to investigate structure-property relationships. This study provides insights into the mechanism underlying formation and evolution of Au nanoparticles via a vapor phase technique which eliminates the shortcomings of conventional liquid-base processes.

scholarly journals Enhanced Electrochemical Performance of Supercapacitors via Atomic Layer Deposition of ZnO on the Activated Carbon Electrode Material

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4188
Author(s):  
Chongrui Wu ◽  
Fuming Zhang ◽  
Xiangshang Xiao ◽  
Junyan Chen ◽  
Junqi Sun ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Atomic Layer Deposition ◽  
Electrode Materials ◽  
Inorganic Compounds ◽  
Atomic Layer ◽  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Operating Voltage ◽  
Layer Deposition

Fabricating electrical double-layer capacitors (EDLCs) with high energy density for various applications has been of great interest in recent years. However, activated carbon (AC) electrodes are restricted to a lower operating voltage because they suffer from instability above a threshold potential window. Thus, they are limited in their energy storage. The deposition of inorganic compounds’ atomic layer deposition (ALD) aiming to enhance cycling performance of supercapacitors and battery electrodes can be applied to the AC electrode materials. Here, we report on the investigation of zinc oxide (ZnO) coating strategy in terms of different pulse times of precursors, ALD cycles, and deposition temperatures to ensure high electrical conductivity and capacitance retention without blocking the micropores of the AC electrode. Crystalline ZnO phase with its optimal forming condition is obtained preferably using a longer precursor pulse time. Supercapacitors comprising AC electrodes coated with 20 cycles of ALD ZnO at 70 °C and operated in TEABF4/acetonitrile organic electrolyte show a specific capacitance of 23.13 F g−1 at 5 mA cm−2 and enhanced capacitance retention at 3.2 V, which well exceeds the normal working voltage of a commercial EDLC product (2.7 V). This work delivers an additional feasible approach of using ZnO ALD modification of AC materials, enhancing and promoting stable EDLC cells under high working voltages.

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