| Summary: | 碩士 === 國立中山大學 === 材料與光電科學學系研究所 === 107 === In this study, an electrodeposition method is used to synthesize a nickel molybdenum sulfide (NiMoS) electrocatalyst for hydrogen evolution. The electrodeposition method has many advantages, including scalability and can be carried out at ambient temperature. Nickel-based metal sulfides are widely used as hydrogen evolution electrocatalyst since nickel is Earth-abundant and synergistic effects can be aroused from nickel and other transition metals. The results of X-Ray diffractometer analysis, high-resolution transmission electron microscopy, X-ray photoelectron
spectroscopy and Raman spectroscopy suggest that NiMoS is a mixed phase composed of metallic nickel, part of Mo doped Ni3S2, nickel hydroxide, nickel oxide, and molybdenum oxide. Electrochemical study suggests NiMoS can be operated in near-neutral electrolyte for at least 2 hours. The NiMoS also shows high electrocatalytic activity with an overpotential of 220 mV at a current density of -1 mA/cm2 , and its Faraday efficiency for hydrogen evolution is close to 90%.
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