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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ti-doped alpha-Fe2O3 nanorods with controllable morphology by carbon layer coating for enhanced photoelectrochemical water oxidation
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Ti-doped alpha-Fe2O3 nanorods with controllable morphology by carbon layer coating for enhanced photoelectrochemical water oxidation

机译:通过碳层涂层具有可控形态的Ti掺杂的α-Fe2O3纳米棒,用于增强光电化学水氧化

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摘要

Ti-doped alpha-Fe2O3 nanorods (NRs) with carbon layer coating were fabricated for photoelectrochemical (PEC) water oxidation. The alpha-Fe2O3 NRs were grown on the surface of a Ti foil substrate by hydrothermal synthesis. Ti4+ was diffused from the Ti substrate and doped into the alpha-Fe2O3 NRs by sintering at 800 degrees C. The presence of Fe2+ in the alpha-Fe2O3 lattice was achieved by annealing the NRs in a lack of oxygen atmosphere, e.g. in argon. The co-existence of Ti4+ and Fe2+ results in significant enhancement of the PEC performance compared with the hematite NRs obtained by annealing in air, showing the absence of Fe2+. The carbon layer coating was conducted by the carbonization of glucose. Impressively, the coated carbon layer can not only facilitate the charge transfer of the photogenerated carriers but also effectively restrain the structural aggregation of the NRs upon high temperature sintering. The carbon layer coated NRs exhibited 1.2 times higher photocurrent density than the uncoated NRs due to the reduced charge recombination and well-distinct NR structures.
机译:用碳层涂层制造具有碳层涂层的Ti掺杂的α-Fe2O3纳米棒(NRS),用于光电化学(PEC)水氧化。通过水热合成在Ti箔基底的表面上生长α-Fe 2 O 3 NR。 Ti4 +从Ti衬底扩散并通过在800℃下烧结掺杂到α-Fe 2 O 3 NR中。通过在缺乏氧气气氛中退火,实现了α-Fe 2 O 3晶格中的Fe2 +的存在,例如,通过退火。在氩气中。与通过在空气中退火的空气中获得的赤铁矿NR相比,Ti4 +和Fe2 +的共存导致PEC性能的显着提高,显示不存在Fe2 +。通过葡萄糖的碳化进行碳层涂层。涂覆的碳层令人印象深刻地,涂覆的碳层不仅可以促进光发化载体的电荷转移,而且还有效地抑制了在高温烧结时NR的结构聚集。由于减少的电荷重组和明显的NR结构,碳层涂覆的NRS表现出比未涂覆的NR越高的光电流密度越高。

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