Lim Taejung, Sung Moonchang, Kim Jongwon
Department of Chemistry, Chungbuk National University, Cheongju, Chungbuk, 28644, South Korea.
Sci Rep. 2017 Nov 13;7(1):15382. doi: 10.1038/s41598-017-15688-9.
Nanoporous electrodes have received great attention because of their unique electrochemical properties. Here, the electrocatalytic oxygen evolution reaction (OER) activities at porous Pt layers with pore dimensions in the microporous range were examined. The OER activity of the porous Pt layers in acidic media increased as the porosity of the Pt layers increased, and the highest OER activity possessed an overpotential that was 270 mV lower than that of a bulk flat electrode. The porous Pt layers did not exhibit electrocatalytic enhancement for OER in basic media, wherein the surface area of the pores was not utilized for OER. The differentiated OER activity of the porous Pt layers demonstrated the different accessibility of reactants in OER: water and hydrated hydroxide ions. The roles of the pores in the Pt layers during OER were investigated using different Pt structures. The work will give insight into the electrochemistry of microporous electrode structures.
纳米多孔电极因其独特的电化学性质而备受关注。在此，研究了孔径在微孔范围内的多孔铂层上的电催化析氧反应（OER）活性。在酸性介质中，多孔铂层的OER活性随着铂层孔隙率的增加而提高，且具有最高OER活性的样品的过电位比块状平面电极低270 mV。多孔铂层在碱性介质中未表现出对OER的电催化增强作用，在碱性介质中孔隙表面未用于OER。多孔铂层不同的OER活性表明了OER中反应物（水和水合氢氧根离子）的不同可达性。利用不同的铂结构研究了铂层中的孔隙在OER过程中的作用。这项工作将深入了解微孔电极结构的电化学。
