Effects of Ir, Sn and Sb in the intermediate Ir1-x-y SnxSbyO2+0.5y layer of Mn-Mo-Sn-O electrocatalyst for hydrogen production

Abstract

An attempt is made to reduce the use of IrO₂ by the IrO₂-SnO₂-Sb₂O₅ intermediate layer which is necessary to avoid the growth of insulating titanium oxide on the titanium substrate for oxygen evolution ã-MnO₂ type nanocrystalline Mn-Mo-Sn-O/Ir_1-x-ySn_xSb_yO_2+0.5y/Ti anodes in 0.5 M NaCl solution of pH 1 at 25°C. These electrodeposited Mn-Mo-Sn-based triple oxide anodes showed about 97.2-98.6 % oxygen evolution efficiency at high current density of 1000 A.m^-2 in 0.5 M NaCl solution of pH 1 at 25°C. The high oxygen evolution efficiency of these triple oxide electrocatalysts maintained during prolonged electrolysis and even after the electrolysis for about two months.

Key-words: Oxygen evolution efficiency; electrocatalyst; seawater electrolysis; CO₂ recycling; XRD

DOI: 10.3126/botor.v7i0.4387

Botanica Orientalis - Journal of Plant Science (2010) 7: 79-84