講者：江佳穎教授 演講題目：Molybdenum Sulfide on 3D Structures for Water Splitting Reaction 演講時間：5/13（五）15:30~17:20 演講地點：博雅館 201 主持人：童國倫教授
Molybdenum Sulfide on 3D Structures for Water Splitting Reaction Chia-Ying Chiang*, Yu-Wen Chen, Ken-Chung Lee Department of Chemical Engineering, National Taiwan University of Science and Technology Taipei, Taiwan (106) * Correspondences author email: cychiang@gate.sinica.edu.tw Tel:+886-2-27376641
Abstract Hydrogen generation from water splitting reaction is an ideal clean energy source yet it requires high energy input. In order to lower the water splitting energy requirement, the development of electrocatalysts plays an important role. Among the electrocatalyst for hydrogen generation reaction (HER), Pt is no doubt to be the best one, however, its cost limits the possibility for widely use in the industries. As a result, the earth abundant, cheap, and nontoxic catalyst such as molybdenum sulfide is gaining more and more attention. In this study, molybdenum sulfide was synthesized on various substrates, such as carbon cloth, carbon paper and commercially available sponge. A known amount of precursor solution was coated on the substrates and undergone thermo-decomposition. These molybdenum sulfides show very different morphologies as well as the electrocatalytic results. The molybdenum sulfide tends to form a sheet-like structure with large electrochemistry surface area (ESA), i.e. ~ 8 cm2 for 1.5 cm2 geometric area substrate, on the carbon paper but folded into a ball-like structure with lower ESA, ~2.8 cm2, on carbon cloth. Furthermore, the non-conducting sponge could also serve as a bendable 3D scaffold and highly increase the ESA to 16 cm2 at a volume of 0.7 cm3. Besides ESA, the electrocatalytic performance indicators, Tafel slopes and HER onset potentials, vary as the thermolysis temperature and environment changed. More detail result will be given in the presentation.
Keywords: molybdenum sulfide; water splitting; hydrogen evolution reaction; electrocatalyst