Kaikai Ba , Yuʼnan Liu , Kai Zhang , Ping Wang , Yanhong Lin , Dejun Wang , Ziheng Li , Tengfeng Xie
{"title":"揭示 MOF 衍生 TiO2 对 Ti-Fe2O3 光阳极的多重影响，实现高效稳定的光电化学水氧化作用","authors":"Kaikai Ba , Yuʼnan Liu , Kai Zhang , Ping Wang , Yanhong Lin , Dejun Wang , Ziheng Li , Tengfeng Xie","doi":"10.1016/S1872-2067(24)60005-7","DOIUrl":null,"url":null,"abstract":"<div><p>α-Fe<sub>2</sub>O<sub>3</sub> is a promising photoanode that is limited by its high surface charge recombination and slow water oxidation kinetics. In this study, we synthesized a TiO<sub>2</sub> layer on Ti-Fe<sub>2</sub>O<sub>3</sub> by annealing Ti-MOFs, followed by ZIF-67 as a co-catalyst, to fabricate a ZIF-67/TiO<sub>2</sub>/Ti-Fe<sub>2</sub>O<sub>3</sub> photoanode for photoelectrochemical (PEC) water splitting. The systematic experimental and theoretical results revealed that the improvement in performance was due to multiple effects of the MOF-derived TiO<sub>2</sub>. This molecule not only passivates the acceptor surface states of Ti-Fe<sub>2</sub>O<sub>3</sub>, thereby reducing the number of surface recombination centers, but also acts as an electron barrier to promote charge separation in the Ti-Fe<sub>2</sub>O<sub>3</sub> bulk. Moreover, MOF-derived TiO<sub>2</sub> can dramatically reduce the energy barrier for the OER of Ti-Fe<sub>2</sub>O<sub>3</sub>, thus promoting the conversion of the intermediate *OH into *O. The synergistic improvement in the bulk and surface properties effectively enhanced the water oxidation performance of Ti-Fe<sub>2</sub>O<sub>3</sub>. The ZIF-67/TiO<sub>2</sub>/Ti-Fe<sub>2</sub>O<sub>3</sub> photoanode exhibits a photocurrent density of up to 4.04 mA cm<sup>−2</sup> at 1.23 V <em>vs</em>. RHE, which is 9.4 times as that of pure Ti-Fe<sub>2</sub>O<sub>3</sub>, and has long-term stability. Our work provides a feasible strategy for constructing efficient organic-inorganic hybrid photoelectrodes.</p></div>","PeriodicalId":9832,"journal":{"name":"Chinese Journal of Catalysis","volume":"61 ","pages":"Pages 179-191"},"PeriodicalIF":15.7000,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Unveiling the multiple effects of MOF-derived TiO2 on Ti-Fe2O3 photoanodes for efficient and stable photoelectrochemical water oxidation\",\"authors\":\"Kaikai Ba , Yuʼnan Liu , Kai Zhang , Ping Wang , Yanhong Lin , Dejun Wang , Ziheng Li , Tengfeng Xie\",\"doi\":\"10.1016/S1872-2067(24)60005-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>α-Fe<sub>2</sub>O<sub>3</sub> is a promising photoanode that is limited by its high surface charge recombination and slow water oxidation kinetics. In this study, we synthesized a TiO<sub>2</sub> layer on Ti-Fe<sub>2</sub>O<sub>3</sub> by annealing Ti-MOFs, followed by ZIF-67 as a co-catalyst, to fabricate a ZIF-67/TiO<sub>2</sub>/Ti-Fe<sub>2</sub>O<sub>3</sub> photoanode for photoelectrochemical (PEC) water splitting. The systematic experimental and theoretical results revealed that the improvement in performance was due to multiple effects of the MOF-derived TiO<sub>2</sub>. This molecule not only passivates the acceptor surface states of Ti-Fe<sub>2</sub>O<sub>3</sub>, thereby reducing the number of surface recombination centers, but also acts as an electron barrier to promote charge separation in the Ti-Fe<sub>2</sub>O<sub>3</sub> bulk. Moreover, MOF-derived TiO<sub>2</sub> can dramatically reduce the energy barrier for the OER of Ti-Fe<sub>2</sub>O<sub>3</sub>, thus promoting the conversion of the intermediate *OH into *O. The synergistic improvement in the bulk and surface properties effectively enhanced the water oxidation performance of Ti-Fe<sub>2</sub>O<sub>3</sub>. The ZIF-67/TiO<sub>2</sub>/Ti-Fe<sub>2</sub>O<sub>3</sub> photoanode exhibits a photocurrent density of up to 4.04 mA cm<sup>−2</sup> at 1.23 V <em>vs</em>. RHE, which is 9.4 times as that of pure Ti-Fe<sub>2</sub>O<sub>3</sub>, and has long-term stability. Our work provides a feasible strategy for constructing efficient organic-inorganic hybrid photoelectrodes.</p></div>\",\"PeriodicalId\":9832,\"journal\":{\"name\":\"Chinese Journal of Catalysis\",\"volume\":\"61 \",\"pages\":\"Pages 179-191\"},\"PeriodicalIF\":15.7000,\"publicationDate\":\"2024-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chinese Journal of Catalysis\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1872206724600057\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Journal of Catalysis","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1872206724600057","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
Unveiling the multiple effects of MOF-derived TiO2 on Ti-Fe2O3 photoanodes for efficient and stable photoelectrochemical water oxidation
α-Fe2O3 is a promising photoanode that is limited by its high surface charge recombination and slow water oxidation kinetics. In this study, we synthesized a TiO2 layer on Ti-Fe2O3 by annealing Ti-MOFs, followed by ZIF-67 as a co-catalyst, to fabricate a ZIF-67/TiO2/Ti-Fe2O3 photoanode for photoelectrochemical (PEC) water splitting. The systematic experimental and theoretical results revealed that the improvement in performance was due to multiple effects of the MOF-derived TiO2. This molecule not only passivates the acceptor surface states of Ti-Fe2O3, thereby reducing the number of surface recombination centers, but also acts as an electron barrier to promote charge separation in the Ti-Fe2O3 bulk. Moreover, MOF-derived TiO2 can dramatically reduce the energy barrier for the OER of Ti-Fe2O3, thus promoting the conversion of the intermediate *OH into *O. The synergistic improvement in the bulk and surface properties effectively enhanced the water oxidation performance of Ti-Fe2O3. The ZIF-67/TiO2/Ti-Fe2O3 photoanode exhibits a photocurrent density of up to 4.04 mA cm−2 at 1.23 V vs. RHE, which is 9.4 times as that of pure Ti-Fe2O3, and has long-term stability. Our work provides a feasible strategy for constructing efficient organic-inorganic hybrid photoelectrodes.
期刊介绍：
The journal covers a broad scope, encompassing new trends in catalysis for applications in energy production, environmental protection, and the preparation of materials, petroleum chemicals, and fine chemicals. It explores the scientific foundation for preparing and activating catalysts of commercial interest, emphasizing representative models.The focus includes spectroscopic methods for structural characterization, especially in situ techniques, as well as new theoretical methods with practical impact in catalysis and catalytic reactions.The journal delves into the relationship between homogeneous and heterogeneous catalysis and includes theoretical studies on the structure and reactivity of catalysts.Additionally, contributions on photocatalysis, biocatalysis, surface science, and catalysis-related chemical kinetics are welcomed.
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