Zhihong Zhuang; Yicheng Zhang; Liang Hu; Jianli Wang; Zhao Zhang; Weiqiang Han
Abstract
Silver (Ag) is a typical catalyst for CO2 electroreduction. To improve the CO faradaic efficiency, ZIF-8 supported thiol-capped Ag nanoparticles (Ag NPs) of about 3.9 nm were facilely synthesized by reducing Ag + in ZIF-8 suspension in the presence of thiol-containing mercaptopropionic acid (MPA) molecules. ...
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Silver (Ag) is a typical catalyst for CO2 electroreduction. To improve the CO faradaic efficiency, ZIF-8 supported thiol-capped Ag nanoparticles (Ag NPs) of about 3.9 nm were facilely synthesized by reducing Ag + in ZIF-8 suspension in the presence of thiol-containing mercaptopropionic acid (MPA) molecules. MPA can induce the monodisperse Ag NPs formation, cap on the surface of Ag NPs and immobilize on ZIF-8 through coordinating with the unsaturated Zn 2+ cations. The Ag/ZIF-8 can efficiently reduce CO2 to CO with a maximum CO faradaic efficiency of 92.3% at the potential of −0.88 V (vs. RHE), higher than that of ZIF-8 and Ag/C. The performance improvement in CO2 electroreduction over Ag/ZIF-8 is probably attributed to the small-size of Ag NPs and the synergistic effect between Ag NPs and ZIF-8.
Muaiyd H. M. Al-Zandi; Changhai Wang
Abstract
A novel three arm microgripper design is presented in this paper. It is a SU-8 based design with integrated microheaters. It is composed of three microactuators: two are based on a design for bi-directional beam deflection and the other is a tri-directional actuator. The actuators are simulated ...
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A novel three arm microgripper design is presented in this paper. It is a SU-8 based design with integrated microheaters. It is composed of three microactuators: two are based on a design for bi-directional beam deflection and the other is a tri-directional actuator. The actuators are simulated and analyzed using COMSOL Multiphysics tool. The first actuator has displacement of about 12 μm and 35 μm respectively when heaters h1 and h2 are used in operation and the heater temperature is about 200°C. The second actuator has a displacement of about 12 μm in all three directions. This microgripper is flexible and can be used to grasp a wide range of sizes of micro-particles. In addition, it has more freedoms of control by using the different combinations of the 8 embedded microheaters for electrothermal actuation.
