Nanoscale characterization of crystallinity in DSA (R) coating

• Dimensionally Stable Anodes (DSA (R)) are used for industrial production of e. g. chlorine and chlorate. It is known that the superior electrocatalytical properties of DSA (R) is due to the large effective area of the porous coating. However, this knowledge is mainly found from in situ electrochemical measurements. Here, we used ex situ methods, AFM, TEM and gas porosimetry, for characterization at the nanoscale. The DSA (R) coating was found to consist of mono-crystalline grains with a size of 20-30 nm and with pores of about 10 nm in diameter. Using a simple geometrical model an effective area was calculated. For a typical coating thickness, an increase of about 1000 times in the effective surface area was found, which is consistent with in situ estimations. These results suggest that the dominating source of surface enlargement is due to nano-crystallinity.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

Nyckelord

AFM

Coating thickness

Crystalline grains

Crystallinities

Dimensionally stable anodes

Effective area

Effective surface area

Electrocatalytical properties

Electrochemical measurements

Ex situ method

Gas porosimetry

Geometrical models

In-situ

Industrial production

Large effective areas

Nano scale

Nanoscale characterization

Porous coatings

TEM

Analog differential analyzers

Chlorine

Electrocatalysis

Nanostructured materials

Thickness measurement

Coatings

NATURAL SCIENCES

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