パナジウム表面における水素の解離反応速度のバルク中酸素濃度依存性
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The sticking probability of Hz on the surface of polycrystalline V covered withoxygen was examined as a function of oxygen concentration in the bulk metal (0.4 to3.3 at.%) at specimen temperatures from 200 to 1000℃. At all temperatures examined,the sticking probability was strongly dependent on the oxygen concentration in the bulk.Such correlation between the reaction rate of Hz on the surface and the oxygenconcentration in the bulk was attributed to the dependence of concentration of oxygenvacancies (holes in surface oxygen coverage) on the oxygen bulk concentration. Thevalues of sticking probability were relatively high even at the oxygen bulk concentration of 3.3 at.%; the oxygen coverage on vanadium was rather "holey" even atthe oxygen concentration close to the solubility limit. The activation energy for H_2dissociation on such holes in the coverage was evaluated to be 10 kJ/mol H_2.
- 富山大学水素同位体科学研究センターの論文
- 2012-03-30
富山大学水素同位体科学研究センター | 論文
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