ChemInform Abstract: A Bismuth‐Based Electrocatalyst for the Chromous‐Chromic Couple in Acid Electrolytes.

Abstract

025ChemInform Abstract The behavior of a solid bismuth hydride (s-BiH) electrode, prepared by electrodeposition from a Bi2O3/NaClO4/HClO4 solution, in an NaClO4/HClO4 electrolyte containing various amounts of Cr(ClO4)3 has been investigated by cyclic voltammetry in the presence and absence of NaCl. The results indicate that s-BiH is a good catalyst for Cr(III) reduction and that the overpotential for H2 evolution is high enough for the reduction of the unsubstituted Cr(H2O)63+ to occur with negligible H2 generation in acid electrolytes. The s-BiH may be of interest as a catalyst for energy storage systems such as the Cr(III)/(II)//Fe(II)/(III) redox flow cell but it is necessary to maintain the s-BiH electrode under polarized conditions in the presence of Cr3+ to prevent oxidative loss of the hydride.