Photoelectrochemistry of WSe[sub 2] Electrodes

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Abstract
Smooth and stepped surfaces of have very different properties for adsorption and charge transfer. Adsorption of OH− and I− is strong at stepped surfaces, but not observable at smooth surfaces. This is apparent in flatband potential measurements. Photocurrent voltage curves indicate in the steady state slow charge transfer rates with all redox couples. This leads to an inversion at smooth parts of the surface, while the high recombination rate at steps prevents accumulation and makes them a sink for holes. I− reacts faster than other redox couples with holes, and catalyzes further hole transfer. The presence of in the solution modifies the surface chemically, and the blocking character of the contact is lost.

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