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Facet-dependent activity of hematite nanocrystals toward the oxygen evolution reaction

机译：Facet-dependent赤铁矿纳米晶体的活性对氧发生反应

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摘要

The electrocatalytic activity of hematite with different exposed facets toward the oxygen evolution reaction (OER) was investigated. Hematite nanoparticles with pseudo cubic, hexagonal bipyramid and plate morphologies were prepared, which predominantly have exposed (012), (113) and (001) facets, respectively. The OER activity of hematite measured under alkaline conditions was significantly dependent on the surface orientation, and the onset potential of the (001) facet was more than 130 mV more negative than those of the (012) and (113) facets. On the basis of the results of spectroelectrochemical measurements and theoretical calculations, this higher activity of the (001) facet was attributed to the lower energy required for the formation of oxo intermediate species. When pH conditions changed from alkaline to neutral, the facet dependence was less pronounced and the OER initiated from almost the same potential on all of the three facets. These findings indicate that the factor determining the OER activity of hematite differs depending on pH, and the surface structure strongly affects the OER activity under conditions where the concerted transfer of protons and electrons proceeds.
机译：赤铁矿的electrocatalytic活动不同的暴露面朝氧气进化反应(OER)调查。赤铁矿纳米粒子与伪立方,六角双锥体和板形态准备,主要暴露(012),分别为(113)和(001)面。活动在碱性的赤铁矿测量明显依赖于条件表面取向的爆发潜力(001)方面超过130 mV负比(012)和(113)方面。spectroelectrochemical测量和理论计算,这更高的活性(001)面是归因于较低形成含氧的所需能量中间物种。从碱性中性,一方面依赖不那么明显,OER发起的在所有的三个潜在的几乎相同方面。确定赤铁矿的OER活动不同根据pH值,和表面结构强烈影响OER活动下条件的协同传输质子和电子。

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