Roles of Antimony and Molybdenum Additions in Mn–Sn–W–O/IrO₂–SnO₂–Sb₂O₅/Ti Anodes for Oxygen Evolution in Seawater Electrolysis

Abstract

An attempt was made to enhance the oxygen evolution efficiency in seawater
electrolysis by additions of antimony and molybdenum to manganese–tin–tungsten oxide
electrocatalyst prepared by anodic deposition on the intermediate Ir_1–x–ySn_xSb_yO_2+0.5y/Ti
electrode. Ir_1–x–ySn_xSb_yO_2+0.5y/Ti supported nanocrystalline g–MnO₂ type Mn–Sn–W–X(X=Sb
or/and Mo)–O electrocatalysts with grain size of about 4-8 nm were tailored by anodic
deposition and these anodes showed almost 100 % oxygen evolution efficiency at current
density of 1000 A.m^-2 in 0.5 M NaCl solution of pH 1 at 25°C. They guaranteed the stable
anode performance of 99.60-99.85% oxygen evolution efficiency for more than 5 months at
current density of 1000 A.m^-2 in 0.5 M NaCl solution of pH 1 at 25°C.

Keywords: Oxygen evolution anodes, electrocatalyst, CO₂ recycle, XRD, SCLM.

DOI:  10.3126/jncs.v25i0.3277

Journal of Nepal Chemical Society Volume 25, 2010 pp 9-18