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Abstract The perovskite-type oxide La 0.2 Sr 0.8 CoO 3 was prepared by sol-gel process, which particle was irregular cube with particle size between 50 and 60 nm. A novel air electrode for oxygen evolution reaction prepared by using La 0.2 Sr 0.8 CoO 3 as a catalyst has a current density of 152 mA cm−2 when the potential is 0.7 V (vs. Hg/HgO) in an alkaline medium (6 mol L−1 KOH) under the air atmosphere. The research results show that n (C 6 H 8 O 7): n (M) = 1:1, pH = 9, calcination temperature 800 °C, 5 h calcination time is the best preparation process conditions. Highlights • The perovskite-type oxide La 0.2 Sr 0.8 CoO 3 was prepared by sol-gel process. • The La 0.2 Sr 0.8 CoO 3 was irregular cube with particle size between 50 and 60 nm. • A novel air electrode for OER contains La 0.2 Sr 0.8 CoO 3 and XC-72. • The La 0.2 Sr 0.8 CoO 3 had excellent activity for oxygen evolution reaction. [ABSTRACT FROM AUTHOR]

Abstract The Pd ZnO/C catalytic material for ethanol oxidation reaction is prepared by microwave heating-glycol reduction method. Pd ZnO is well polymerized and dispersed on XC72. The results demonstrate that Pd ZnO/C has better electro catalytic activity and stability for ethanol oxidation reaction than Pd/C at room temperature. ZnO/C shows no catalysis for ethanol oxidation. The oxidation peak potential of Pd ZnO/C electrode is shifted negatively to 0.21 V. The current density of Pd ZnO/C electrode is 145 mA cm−2, while that of the Pd/C electrode is 60 mA cm−2. Moreover, single cell discharge test shows that discharge voltage of the Pd ZnO/C electrode reaches to 0.41 V at 30 mA cm−2. In summary, ZnO as a co-catalyst significantly improves the activity of Pd ZnO/C catalyst for ethanol oxidation reaction. Highlights • The Pd ZnO/C catalyst for EOR was prepared by microwave heating-glycol method. • The particle size of Pd is about 7 nm and the particles have good dispersion. • Zinc oxide could increase the reaction kinetics of Pd/C as a co-catalyst for EOR. • The EOR performance of the Pd ZnO/C electrode decreases slowly. • The discharge voltage of the Pd ZnO/C cell reaches 0.41 V at 30 mA cm−2. [ABSTRACT FROM AUTHOR]