“…The in situ EC-STM image of the Fe(110) single crystal was then obtained at −0.31 V at a tip bias of 25 mV and a tunneling current of 3 nA. The image shown in Figure is different from that of the surface structure known for single crystalline Fe(110). ,− The van der Waals diameter of an oxygen atom is 0.284 nm,25a which is very similar to the atomic spacing, 0.29 nm, shown in Figure c. Here, the image seems to represent that of the oxygen ions on FeO with 0.25 and 0.31 nm of ionic spacings located at the two-fold bridge site of the Fe atoms.…”
Section: Resultsmentioning
confidence: 83%
“…Peaks C1/A1 are assigned to the desorption/adsorption of the chloride ions at the Fe(110) single-crystal surface, which was confirmed by the lack of the peaks in the presence of other anions such as SO 4 2- (not shown). Peaks C2/A2 are assigned to a redox couple of a monolayer of the Fe(OH) 2 (0001) film, and peak C3 must be due to proton reduction. , The open circuit potential (OCP) was −0.58 V for this system. 5 (a) CV at the Fe(110) single crystal in 0.1 M KCl solution, (b) EC-STM image at OCP (−0.31 V), and (c) proposed structure.…”
Section: Resultsmentioning
confidence: 94%
“…The in situ electrochemical scanning tunneling microscopic (EC-STM) images were obtained on an Fe(110) single crystal (Mateck, 99.98%, diameter 9 mm), which was mechanically polished with alumina powder, followed by ultrasonication in ethanol and rinsing with purified water. After the mechanical polishing, it was etched in a 3% HF + 97% H 2 O 2 solution for 10 min to remove the damaged layers . In the homemade EC-STM cell, the crystal was then prepolarized at −1.90 V for 10 min to obtain a reproducible oxide free surface.…”
Effects of organic additives, such as benzoic acid (BA) and poly(ethylene glycol)s (PEGs), on the initial stage of the zinc electrodeposition have been investigated at iron electrodes using cyclic voltammetry, electrochemical quartz crystal microbalance measurements and in situ electrochemical scanning tunneling microscopy in an acidic zinc chloride solution in efforts to gain a molecular-level understanding of their roles. BA is adsorbed strongly at the sites of more negative potentials on the electrode, although it is randomly adsorbed on the iron surface at around an open circuit potential. Its role seems to control the deposition rate at the dendritic sites by blocking the active surface via adsorption. On the contrary, PEGs are adsorbed more or less evenly with a well-ordered structure on the iron surface and appear to desorb in the underpotential deposition region of zinc ions, which helps inhibit proton reduction by effectively blocking the electrode surface.
“…The in situ EC-STM image of the Fe(110) single crystal was then obtained at −0.31 V at a tip bias of 25 mV and a tunneling current of 3 nA. The image shown in Figure is different from that of the surface structure known for single crystalline Fe(110). ,− The van der Waals diameter of an oxygen atom is 0.284 nm,25a which is very similar to the atomic spacing, 0.29 nm, shown in Figure c. Here, the image seems to represent that of the oxygen ions on FeO with 0.25 and 0.31 nm of ionic spacings located at the two-fold bridge site of the Fe atoms.…”
Section: Resultsmentioning
confidence: 83%
“…Peaks C1/A1 are assigned to the desorption/adsorption of the chloride ions at the Fe(110) single-crystal surface, which was confirmed by the lack of the peaks in the presence of other anions such as SO 4 2- (not shown). Peaks C2/A2 are assigned to a redox couple of a monolayer of the Fe(OH) 2 (0001) film, and peak C3 must be due to proton reduction. , The open circuit potential (OCP) was −0.58 V for this system. 5 (a) CV at the Fe(110) single crystal in 0.1 M KCl solution, (b) EC-STM image at OCP (−0.31 V), and (c) proposed structure.…”
Section: Resultsmentioning
confidence: 94%
“…The in situ electrochemical scanning tunneling microscopic (EC-STM) images were obtained on an Fe(110) single crystal (Mateck, 99.98%, diameter 9 mm), which was mechanically polished with alumina powder, followed by ultrasonication in ethanol and rinsing with purified water. After the mechanical polishing, it was etched in a 3% HF + 97% H 2 O 2 solution for 10 min to remove the damaged layers . In the homemade EC-STM cell, the crystal was then prepolarized at −1.90 V for 10 min to obtain a reproducible oxide free surface.…”
Effects of organic additives, such as benzoic acid (BA) and poly(ethylene glycol)s (PEGs), on the initial stage of the zinc electrodeposition have been investigated at iron electrodes using cyclic voltammetry, electrochemical quartz crystal microbalance measurements and in situ electrochemical scanning tunneling microscopy in an acidic zinc chloride solution in efforts to gain a molecular-level understanding of their roles. BA is adsorbed strongly at the sites of more negative potentials on the electrode, although it is randomly adsorbed on the iron surface at around an open circuit potential. Its role seems to control the deposition rate at the dendritic sites by blocking the active surface via adsorption. On the contrary, PEGs are adsorbed more or less evenly with a well-ordered structure on the iron surface and appear to desorb in the underpotential deposition region of zinc ions, which helps inhibit proton reduction by effectively blocking the electrode surface.
“…In our previous work, 10) we have succeeded in the removal of oxide layer formed in air on Fe(110), which is also one of the base metals, and in the in-situ EC-AFM observation of bare and anodically oxidized surface of Fe(110) with atomic resolution in sodium sulfate neutral solution.…”
Bare and anodically oxidized Ni(110) surfaces in 0.05 kmol m À3 Na 2 SO 4 (pH = 6.5) and 0.01 kmol m À3 NaOH (pH = 12) aqueous solution have been investigated by in-situ electrochemical atomic force microscopy (EC-AFM) with atomic resolution. We have succeeded in in-situ observation of unreconstructed Ni(110)-(1 Â 1) structures in both 0.05 kmol m À3 Na 2 SO 4 and 0.01 kmol m À3 NaOH solution. Under passive region, we have observed well-ordered structures differing from those of the bare surfaces and we found that surface structure of anodically oxidized Ni(110) in 0.05 kmol m À3 Na 2 SO 4 solution agrees with NiO(110), whereas that in 0.01 kmol m À3 NaOH solution agrees with -Ni(OH) 2 (0001). These EC-AFM observations reveal the following orientation relationship of the surface structures on the anodic oxide layers and the substrates: NiO (110)
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