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Voltammetric Study of Reduction Processes in Rhodium(+3)–Selenium(+4) Acidic Mixtures
Author(s) -
Zelić Marina,
Strmečki Slađana
Publication year - 2007
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200603816
Subject(s) - rhodium , hanging mercury drop electrode , selenium , chemistry , inorganic chemistry , perchlorate , voltammetry , mercury (programming language) , catalysis , chloride , cyclic voltammetry , sulfate , electrochemistry , electrode , organic chemistry , computer science , ion , programming language
Using square‐wave voltammetry and linear scan voltammetry, some reduction processes, that take place on the hanging mercury drop electrode (HMDE) in rhodium(+3)–selenium(+4) mixtures, were studied in highly acidic sulfate, chloride and perchlorate solutions. The special attention was paid to the peak located at −1.1 V, that reflects catalytic hydrogen evolution on the rhodium islets, and its changes under the influence of added selenium(+4), or selenium(−2) produced at the electrode. It can be concluded that addition of selenite to a dilute rhodium solution has the similar effect as the increase of rhodium(+3) concentration, making the catalytic hydrogen evolution more pronounced, probably by changing the properties of metal clusters on the mercury drop. If so, the effect could be of some practical importance in production of rhodium deposits on other surfaces, too.