Abstract
The stability and dissolution of MgO(100) single crystal surfaces in alkaline solutions of NaClO4 and NaCl were investigated by means of in situ atomic force microscopy (AFM) and ex situ angle resolved X-ray photoelectron spectroscopy (AR-XPS). MgO surfaces showed higher resistance to dissolution in NaClO4 electrolyte due to the formation of a gel-like hydroxide layer. The emergence of rectangular/square formed pits oriented in the 〈110〉 directions during immersion in NaCl electrolytes at alkaline pH was observed. The results are discussed on the basis of a substitution of hydroxides by chlorides at the electrolyte/MgO interface.
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