The Study on Copper-Based Oxides as Bifunctional Catalyst for Overall Water Splitting
| Autor: | Peng, Chun-Kuo, 彭俊國 |
|---|---|
| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Global warming is the important issue nowadays. There are many technologies applied to overcome the problem. The research of renewable energy sources has now gained many attentions. The development of efficient catalysts from earth‐abundant elements are key to water splitting. Both of photoelectrochemical (PEC) water splitting and the oxygen evolution reactions (OER) are the promising methods. Herein, we demonstrated the transition metal oxide as the bifuntional catalyst. The copper oxide was first fabricated on the copper foil by a facile chemical synthesis route. Subsequently, the hydrogenated Cu2O (HCu2O) are prepared by thermal treatment in H2 atmosphere. The HCu2O exhibited remarkable performance for both H2 and O2 evolution in water splitting. The HCu2O showed great photocatalytic efficiency with photocurrent of 3.3mAcm-2. In addition, the detail characterization techniques were used to study the potential of copper-based oxide for water splitting. Aside from photocatalytic HER applications, the HCu2O exhibited the electrocatalytic activity in OER with current density of 10 mAcm-2 at overpotential of 390 mV and the Tafel slope of 140 mVdec-1. The OER as a half reaction of water splitting is a multistep electron-proton transfer coupled reaction. Therefore, the advanced operando/in-situ X-ray characterization techniques were used in this work. With the aid of these methods, the mechanism of charge transfers and the intermediates-derived active site were thoroughly investigated. Accordingly, the HCu2O is a promising candidate for overall water splitting owing to its excellent PEC/OER performance and low fabrication cost. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|