FeOOH 纳米棒的制备和相转变：应变对催化水氧化的影响。
Preparation and phase transition of FeOOH nanorods: strain effects on catalytic water oxidation.
机构信息
Department of Chemistry, Mokpo National University, Muan-gun, Jeonnam 1666 Yeongsan-ro, Cheonggye-myeon, Muan-gun, Jeonnam 58554, Republic of Korea.
Korea Research Institute of Standard and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea.
出版信息
Nanoscale. 2017 Apr 6;9(14):4751-4758. doi: 10.1039/c6nr09790a.
The evolution of the phase and morphology of FeOOH nanorods prepared by a hydrothermal method is studied via X-ray diffraction (XRD) and in situ transmission electron microscopy. The FeOOH nanorod with a tetragonal structure (β-FeOOH) is gradually converted into a rhombohedral FeO nanorod by a simple thermal treatment. The existence of an intermediate FeOOH structure with high lattice strains during the phase transition is identified by Rietveld analysis using XRD. The electrochemical properties of the nanorods are investigated based on the crystal phases to elucidate their relative catalytic activities. The strained-FeOOH nanorods exhibited enhanced catalytic water oxidation activity and stability. Typically, the strained-FeOOH nanorods showed high electrochemical stability under neutral conditions, while tetragonal FeOOH nanorods under the same conditions showed rapid deactivation for water oxidation reaction.
通过 X 射线衍射（XRD）和原位透射电子显微镜研究了水热法制备的 FeOOH 纳米棒的相和形态演变。通过简单的热处理，具有四方结构（β-FeOOH）的 FeOOH 纳米棒逐渐转化为菱面体 FeO 纳米棒。XRD 的 Rietveld 分析确定了在相变过程中存在晶格应变较高的中间 FeOOH 结构。根据晶体相研究了纳米棒的电化学性质，以阐明其相对催化活性。应变-FeOOH 纳米棒表现出增强的催化水氧化活性和稳定性。通常，在中性条件下，应变-FeOOH 纳米棒表现出高电化学稳定性，而在相同条件下的四方 FeOOH 纳米棒则表现出快速的水氧化反应失活。
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