Abstract
We report a water decomposition mode called ‘Aquaionic Splitting (AiS)’ by means of iron corrosion in aqueous solution. In this paper, we investigated the phenomenon by controlling the reaction between iron and water. A pseudo-sacrificial protection method with oil paint was employed to select the anode and cathode formation locations that govern iron corrosion. Then, the AiS reaction was visualized by using BTB solution, whose colour corresponds to pH, to produce colour patterning that corresponds to the aquaion distribution. It has become clear that water can be selectively separated into protons and hydroxide ions by corrosion control treatment. In this vein, the diffusion coefficient of protons was estimated by using the colour patterning of BTB solution that accompanies iron corrosion, and aquaion distribution was then computer simulated by solving the diffusion equation.
Highlights
We report a water decomposition mode called ‘Aquaionic Splitting (AiS)’ by means of iron corrosion in aqueous solution
Compared with the untreated sample, in any of the samples subjected to anticorrosion treatment, the colour of the agar gel around the area where the paint is applied changes from green to blue, while the colour of the region around the area without paint changes from green to yellow, indicating that AiS colour patterning was formed by iron corrosion
Www.nature.com/scientificreports region of the bromothymol blue (BTB) agar around the corrosion area was acidic, while the bluish region around the anticorrosion area was alkaline, suggesting that proton is generated in the area where corrosion progresses, as the pH is lowered, and that hydroxide ion is generated in the area where corrosion is prevented, as the pH is increased, i.e., where the AiS reaction (H2O → H+ + OH−) occurs
Summary
We report a water decomposition mode called ‘Aquaionic Splitting (AiS)’ by means of iron corrosion in aqueous solution. It has become clear that water can be selectively separated into protons and hydroxide ions by corrosion control treatment In this vein, the diffusion coefficient of protons was estimated by using the colour patterning of BTB solution that accompanies iron corrosion, and aquaion distribution was computer simulated by solving the diffusion equation. The methods of measuring the diffusion coefficient of ion species in a dilute solution or gel include the use of a radioactive tracer[14], the holographic laser method[15], the nuclear magnetic resonance method[16] and the fluorescence method[17] In these methods, it is not an easy task to detect the diffusion of protons in an aqueous corrosive environment, and a dedicated device is required
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