Influence of sodium halides (NaF, NaCl, NaBr, NaI) on the photocatalytic performance of hydrothermally synthesized hematite photoanodes

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Title:	Influence of sodium halides (NaF, NaCl, NaBr, NaI) on the photocatalytic performance of hydrothermally synthesized hematite photoanodes
Authors:	林景崎;Wang, TsingHai;Huang, Mao-Chia;Hsieh, Yi-Kong;Chang, Wen-Sheng;Lin, Jing-Chie;Lee, Chih-Hao;Wang, Chu-Fang
Contributors:	工學院材料科學與工程研究所
Keywords:	aqueous solutions;Bromides - chemistry;Catalysis;colloids;crystal structure;Electrodes;ferric chloride;Ferric Compounds - chemical synthesis;Ferric Compounds - chemistry;hematite;ionic strength;ions;iron;photocatalysis;sodium;sodium bromide;sodium chloride;Sodium Chloride - chemistry;Sodium Compounds - chemistry;sodium fluoride;Sodium Fluoride - chemistry;Sodium Iodide - chemistry;sodium nitrate;standard operating procedures;texture;X-radiation
Date:	2013-08-28
Issue Date:	2026-04-23 11:37:09 (UTC+8)
Publisher:	American Chemical Society;United States: American Chemical Society
Abstract:	摘要： It has been suggested that a high concentration of Fe3+ in solution, a low pH, and noncomplexing ions of high ionic strength are all essential for developing a high-quality hematite array. Our curiosity was piqued regarding the role of the electrolyte ions in the hydrothermal synthesis of hematite photoanodes. In this study, we prepared hematite photoanodes hydrothermally from precursor solutions of 0.1 M FeCl3 at pH 1.55 with a background electrolyte of 1.0 M sodium halide (NaF, NaCl, NaBr, or NaI). We compared the structures and properties of the as-obtained hematite photoanodes with those of the material prepared in 1.0 M NaNO3, the most widely adopted electrolyte in previous studies. Among our studied systems, we found that the hematite photoanode prepared in NaCl solution was the only one possessing properties similar to those of the sample obtained from the NaNO3 solutionmost importantly in terms of photoelectrochemical performance (ca. 0.2 mA/cm2 with +0.4 V vs SCE). The hematites obtained from the NaF, NaBr, and NaI solutions exhibited much lower (by approximately 2 orders of magnitude) photocurrent densities under the same conditions, possibly because of their relatively less ordered crystallinity and the absence of rodlike morphologies. Because the synthetic protocol was identical in each case, we believe that these two distinct features reflect the environments in which these hematite photoanodes were formed. Consistent with the latest studies reported in the literature of the X-ray photoelectron spectra of fast-frozen hematite colloids in aqueous solutions, it appears that the degree of surface ion loading at the electrolyte–hematite interface (Stern layer) is critical during the development of hematite photoanodes. We suspect that a lower ion surface loading benefits the hematite developing relatively higher-order and a rodlike texture, thereby improving the photoelectrochemical activity. 其他題名： ACS Appl. Mater. Interfaces 出版者： United States: American Chemical Society 出版日期： 2013-08-28 出處： ACS applied materials & interfaces, 2013-08, Vol.5 (16), p.7937-7949 資源來源： American Chemical Society Journals 版權： Copyright © 2013 American Chemical Society 識別號： ISSN: 1944-8244 識別號： ISSN: 1944-8252 識別號： EISSN: 1944-8252 識別號： DOI: 10.1021/am402024q 識別號： PMID: 23865744
Appears in Collections:	[Institute of Materials Science and Engineering] journal & Dissertation

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