[摘　　要]：

The adsorption of H2PO4- ions was studied on low Miller index rhodium single crystal electrodes by in situ FTIR spectroscopy. It is found that for Rh(1?0?0) and Rh(1?1?0), H2PO4- ions are the major species at low potentials, but at higher potentials, some of the H2PO4- ions undergo a potential induced deprotonation and probably there is a mixture of H2PO4- and HPO42- ions. On Rh(1?1?1) the deprotonation starts at very low potentials and at higher potentials the H2PO4- is fully converted to HPO42-. The behavior of the band center and o......更多

The adsorption of H2PO4- ions was studied on low Miller index rhodium single crystal electrodes by in situ FTIR spectroscopy. It is found that for Rh(1?0?0) and Rh(1?1?0), H2PO4- ions are the major species at low potentials, but at higher potentials, some of the H2PO4- ions undergo a potential induced deprotonation and probably there is a mixture of H2PO4- and HPO42- ions. On Rh(1?1?1) the deprotonation starts at very low potentials and at higher potentials the H2PO4- is fully converted to HPO42-. The behavior of the band center and of the band intensity with the applied potential was also analyzed. It is found that the adsorption increases from 0.08 V vs. a Pd-H2 electrode up to 0.5 V and then it decreases when the OH starts to be adsorbed.关闭