American Chemical Society
Browse
jp6b04771_si_001.pdf (3.79 MB)

Charting the Outer Helmholtz Plane and the Role of Nitrogen Doping in the Oxygen Reduction Reaction Conducted in Alkaline Media Using Nonprecious Metal Catalysts

Download (3.79 MB)
journal contribution
posted on 2016-10-10, 00:00 authored by Stanfield Youngwon Lee, Dong Young Chung, Myeong Jae Lee, Yun Sik Kang, Heejong Shin, Mi-Ju Kim, Christopher W. Bielawski, Yung-Eun Sung
This study was focused on elucidating the origin of the catalytic activity displayed by non-precious-metal-based oxygen reduction reaction (ORR) catalysts before and after heat treatment. Electrochemical measurements were recorded using a series of metal phthalocyanines calculated to exhibit varying oxygen adsorption energies before and after heat treatment at a temperature sufficiently high to facilitate degradation. Collectively, the results indicate that while the oxygen adsorption is germane to the catalytic activity before heat treatment, the ORR appears to proceed through a different pathway that is not dependent on adsorption energy after heat treatment. These conclusions help to explain the high catalytic activities exhibited by carbon- or nitrogen-based materials containing metal ions after heat treatment and may lead to the realization of substitutes for ORR catalysts that utilize precious transition metals.

History