Corrosion light-assisted

Unfortunately, many of the semiconductor materials which would satisfy requirement (a) and (b) are not stable and undergo light-assisted corrosion instead of driving the desired redox reaction. Several important methods have been devised to chemically protect the surfaces of such materials as Si, CdS or CdSe, and the GaAs with the result however that the redox reactions that can be light-assisted are dictated by the redox e.m.f. of the surface-attached species (6). 

Modification of semiconductor electrode response with adsorbed or attached dye molecules is an attractive alternative to other photoelectrochemical systems (7-13). Metal oxides which are stable or have very low corrosion rates but are transparent to visible wavelength light can be used in light-assisted electrochemical reactions when modified with monolayers and multilayers of a wide variety of chromophores interposed between the electrode and electrolyte. With one exception, the initial reports of energy conversion efficiencies of electrodes with adsorbed dyes was disappointingly low. Recently however,... 

In the presented case CdS, as a prominent example for nano structured n-VI semiconductors, were used since their lower band gaps compared to corresponding oxide materials make them attractive candidates for visible light assisted photocatalytic hydrogen generation. The hole scavenger TEA protects the CdS from anodic photo corrosion (caused by oxidation reactions, i.e. CdS + 2h Cd - + S) by swiftly... 

Corrosion in Nuclear Systems Environmentally Assisted Cracking in Light Water Reactors... 

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