Electrochemistry of gold in aqueous sulfuric acid solutions under neural stimulation conditions

Daniel R. Merrill*, Ionel C. Stefan, Daniel Alberto Scherson, J. Thomas Mortimer

*この研究の対応する著者

研究成果: Article査読

18 被引用数 (Scopus)

抄録

The electrochemistry of gold in 50 mM aqueous sulfuric acid solutions under conditions typical of neural stimulation (cathodic-first current pulsing at 50 Hz) was studied in oxygen-free and oxygenated solutions. As the electrode was pulsed from +0.75 V vs. a reference hydrogen electrode using a 100 μs, -500 mA/cm2 pulse in oxygen-free solutions, (i) the initial 10 μC/cm2 of injected charge was stored in the double layer, (ii) the next 20-30 μC/cm2 was accommodated by double-layer charging plus an undetermined process consuming about 1.8 μC/cm2, and (iii) when the electrode potential reached approximately -0.52 V, water reduction consumed all further charge. In oxygen-saturated solution, the unrecoverable charge (associated with irreversible reactions) was not significantly different from the deaerated situation throughout the pulse period, but the electrode potential was less negative, consistent with oxygen reduction. Oxygen reduction appears reversible during a 100 μs pulse, provided the electrode is clamped back to +0.75 V immediately after the pulse. If an open-circuit period was introduced between the current pulse and application of the reversal potential, unrecoverable charge accumulated more rapidly in oxygen-saturated solution, suggesting that processes occurring during the interpulse interval of neural stimulation may produce potentially damaging reaction products.

本文言語English
ジャーナルJournal of the Electrochemical Society
152
7
DOI
出版ステータスPublished - 2005 8月 22
外部発表はい

ASJC Scopus subject areas

  • 電気化学
  • 表面、皮膜および薄膜
  • 表面および界面

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