A novel methanol-tolerant Ir-Se chalcogenide electrocatalyst for oyxgen reduction

作者：Lee Kunchan; Zhang Lei; Zhang Jiujun^*

来源：Journal of Power Sources, 2007, 165(1): 108-113.

DOI：10.1016/j.jpowsour.2006.11.063

• chalcogenide
• iridium
• selenium
• electrocatalyst(s)
• oxygen reduction reaction
• methanol tolerance

A novel methanol-tolerant oxygen-reduction catalyst, Iridium-selenium (Ir-Se) chalcogenide, was synthesized by chemical precipitation in an organic solvent. Auger electron spectroscopy (AES) analysis confirmed that the synthesized Ir-Se chalcogenide had a chemical formula of Ir4Se. This chalcogenide showed strong catalytic activity towards the oxygen reduction reaction (ORR) and a high methanol tolerance. It was found that most of the oxygen could be directly reduced to water through a four-electron pathway with less than 10% hydrogen peroxide (H2O2) being produced during the ORR. The improvement in catalytic activity of the Ir-Se chalcogenide in comparison with that of pure Ir might be attributed to the effect of a bimetallic interaction.

• 出版日期2007-2-25