Effects of antimony and tungsten additions in Mn_Mo_Sn oxide electrocatalyst for hydrogen production from electrolysis of 0.5 M NaCl solution

Abstract

Successfully tailored new types of nanocrystalline Mn-Mo-Sn-W-O and Mn-Mo-Sn-W-Sb-O electrocatalysts on the intermediate layer of  Ir1-x-ySnxSbyO2+0.5y on titanium metal substrate for the production of hydrogen gas from electrolysis of 0.5 M NaCl solution of pH 1 at   very high current density of 1000 A.m-2 with forming less than 0.3 % of the environmentally harmful chlorine. Antimony and tungsten additions   are more effective for better durability of both the electrodeposited Mn-Mo-Sn-X(X=Sb,W)-O/Ir1-x-ySnxSbyO2+0.5y/Ti anodes than that   of Mn-Mo-Sn-O/Ir1-x-ySnxSbyO2+0.5y/Ti anode for long period electrolysis of acidic 0.5 M NaCl solution to produce hydrogen. The high   oxygen evolution efficiency (OEE) of the quadrate or more oxides electrocatalysts (i. e., 99.7-99.9 % OEE) maintained during prolonged   electrolysis and even after electrolysis for five or more months. The Mn-Mo-Sn-X(X=Sb,W)-O/Ir1-x-ySnxSbyO2+0.5y/Ti anodes showed  about 99.7-99.9 % of oxygen evolution efficiency.   DOI: http://dx.doi.org/10.3329/bjsir.v47i2.11459   Bangladesh J. Sci. Ind. Res. 47(2), 231-238, 2012