| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 98 === In-situ Scanning Tunneling Microscopy (In-situ STM) and Cyclic Voltammetry (CV) are used to study the electrodeposition of nickel and cobalt and the adsorption of bisulfate anions on mercury film electrode.
According to previously research, when 1~2 layers Hg deposits on Pt(111) in 0.1 M perchloric acid, the potential was changed progressively negative from 0.3 V to 0.1 V, therefore, we have tried to conduct the same experiment in sulfuric acid on Pt(111) and Ir(111) to see whether the mercury film has the flaking situation production or not. First, when 1~2 layers Hg deposit on Pt(111) in 0.5 M sulfuric acid, we can find three ordered structure: when the potential from 0.2 V to 0.25 V, structure (4×5) ,θ= 0.05 was shown here, and then the potential was changed from 0.25 V to 0.35 V, here show the two structure (3×2√3) and (3×√13),θ= 0.166, finally, the potential was changed progressively positive, the structure was changed from order to disorder. Pt-Hg adatoms is moire patterns at 0.1~0.5 V. When the potential was changed progressively negative from 0.3 V to 0.1 V, the structure of mercury film was not changed. Finally, when >10 layers Hg deposit on Pt(111), no ordered structure appear from 0.1 V to 0.5 V. Use Ir(111) as substrate, no ordered structure appear in monolayer or multilayers Hg film. Ir-Hg adatoms is striped phase at 0.1~0.5 V. When the potential was changed progressively negative from 0.3 V to 0.1 V, mercury film was not changed. Then, we discuss the structure different from the anions, mercury film thickness and the substrate.
Second part, we study the electrodeposition of nickel and cobalt on mercury film electrode. Mainly aims at the different electrolyte solution to observe its electrochemistry behavior. (1) in 0.1 M potassium perchlorate solution add 1 mM metal solution (nickel perchlorate or cobalt percholrate), (2) in 0.1 M potassium perchlorate solution add 0.01 M boric acid and 1 mM metal solution (nickel perchlorate or cobalt percholrate), (3) in 0.1 M potassium perchlorate solution add 1 mM potassium iodine and 1 mM metal solution (nickel perchlorate), (4) in 0.1 M potassium perchlorate solution add 1 mM potassium chlorine and 1 mM metal solution (nickel perchlorate). The different electrolyte solution will affect its electrochemistry behavior, I extrapolated that between the cobalt and the mercury will have the alloy production.
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