{"title":"增强ⅱ型WO3/ZnWO4纳米片的电荷输运促进盐水分解反应。","authors":"Prashant Choubey, Ritu Verma, Mrinmoyee Basu","doi":"10.1002/asia.202500292","DOIUrl":null,"url":null,"abstract":"<p><p>Photoelectrochemical (PEC) water-splitting is an energy-efficient and eco-friendly technique to produce green hydrogen (H<sub>2</sub>). Here, WO<sub>3</sub> is synthesized for saline water-splitting reaction. Initially, the activity of WO<sub>3</sub> is enhanced through morphology tuning. Nanoparticles (NPs), thick nanosheets (TSs), and nanoflakes (NFs) of WO<sub>3</sub> are synthesized, and their PEC activity is determined. The NFs show a photocurrent density of 1.53 mA/cm<sup>2</sup> at 1.2 V vs. Ag/AgCl, whereas TSs and NPs can generate 1.17 mA/cm<sup>2</sup> and 1.07 mA/cm<sup>2</sup> at 1.2 V vs. Ag/AgCl, respectively. The low charge transportation rate inhibits the PEC performance of these NFs in water-splitting reactions. To mitigate this problem, the type-II heterojunction is constructed with optimized deposition of ZnWO<sub>4</sub> on WO<sub>3,</sub> which favors the migration of charge-carriers in opposite directions, facilitating the charge-carrier separation and eventually enhancing the PEC activity. The optimized heterojunction shows a photocurrent density 1.5 times greater than bare WO<sub>3</sub> and 2.4 times enhanced carrier density, 2.16×10<sup>21</sup> cm<sup>-3</sup>. The heterostructure's rapid OCP decay and higher charge injection efficiency indicate an improved charge transport capability, the primary driving force for enhanced PEC activity. The stability of WO<sub>3</sub>/ZnWO<sub>4</sub> is studied for one hour.</p>","PeriodicalId":145,"journal":{"name":"Chemistry - An Asian Journal","volume":" ","pages":"e202500292"},"PeriodicalIF":3.5000,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced Charge Transportation in Type II WO<sub>3</sub>/ZnWO<sub>4</sub> Nanoflakes for Boosting Saline Water-splitting Reaction.\",\"authors\":\"Prashant Choubey, Ritu Verma, Mrinmoyee Basu\",\"doi\":\"10.1002/asia.202500292\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Photoelectrochemical (PEC) water-splitting is an energy-efficient and eco-friendly technique to produce green hydrogen (H<sub>2</sub>). Here, WO<sub>3</sub> is synthesized for saline water-splitting reaction. Initially, the activity of WO<sub>3</sub> is enhanced through morphology tuning. Nanoparticles (NPs), thick nanosheets (TSs), and nanoflakes (NFs) of WO<sub>3</sub> are synthesized, and their PEC activity is determined. The NFs show a photocurrent density of 1.53 mA/cm<sup>2</sup> at 1.2 V vs. Ag/AgCl, whereas TSs and NPs can generate 1.17 mA/cm<sup>2</sup> and 1.07 mA/cm<sup>2</sup> at 1.2 V vs. Ag/AgCl, respectively. The low charge transportation rate inhibits the PEC performance of these NFs in water-splitting reactions. To mitigate this problem, the type-II heterojunction is constructed with optimized deposition of ZnWO<sub>4</sub> on WO<sub>3,</sub> which favors the migration of charge-carriers in opposite directions, facilitating the charge-carrier separation and eventually enhancing the PEC activity. The optimized heterojunction shows a photocurrent density 1.5 times greater than bare WO<sub>3</sub> and 2.4 times enhanced carrier density, 2.16×10<sup>21</sup> cm<sup>-3</sup>. The heterostructure's rapid OCP decay and higher charge injection efficiency indicate an improved charge transport capability, the primary driving force for enhanced PEC activity. The stability of WO<sub>3</sub>/ZnWO<sub>4</sub> is studied for one hour.</p>\",\"PeriodicalId\":145,\"journal\":{\"name\":\"Chemistry - An Asian Journal\",\"volume\":\" \",\"pages\":\"e202500292\"},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2025-03-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemistry - An Asian Journal\",\"FirstCategoryId\":\"1\",\"ListUrlMain\":\"https://doi.org/10.1002/asia.202500292\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemistry - An Asian Journal","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1002/asia.202500292","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
光电化学（PEC）水分解技术是一种节能环保的生产绿色氢（H2）的技术。在这里，用盐水裂解反应合成WO3。最初，WO3的活性通过形貌调整得到增强。合成了WO3纳米粒子（NPs）、厚纳米片（TSs）和纳米片（NFs），并测定了它们的PEC活性。在1.2 V vs. Ag/AgCl时，NFs的光电流密度为1.53 mA/cm2，而在1.2 V vs. Ag/AgCl时，ts和NPs的光电流密度分别为1.17 mA/cm2和1.07 mA/cm2。低电荷传输速率抑制了这些NFs在水分解反应中的PEC性能。为了解决这一问题，通过优化ZnWO4在WO3上的沉积，构建了ii型异质结，有利于电荷和载流子的反向迁移，促进电荷-载流子分离，最终提高了PEC活性。优化后的异质结光电流密度比裸WO3高5倍，载流子密度提高2.4倍，为1.03 x 10-21 cm-3。异质结构快速的OCP衰减和更高的电荷注入效率表明电荷输运能力的提高，这是增强PEC活性的主要动力。研究了WO3/ZnWO4的稳定性1小时。
Enhanced Charge Transportation in Type II WO3/ZnWO4 Nanoflakes for Boosting Saline Water-splitting Reaction.
Photoelectrochemical (PEC) water-splitting is an energy-efficient and eco-friendly technique to produce green hydrogen (H2). Here, WO3 is synthesized for saline water-splitting reaction. Initially, the activity of WO3 is enhanced through morphology tuning. Nanoparticles (NPs), thick nanosheets (TSs), and nanoflakes (NFs) of WO3 are synthesized, and their PEC activity is determined. The NFs show a photocurrent density of 1.53 mA/cm2 at 1.2 V vs. Ag/AgCl, whereas TSs and NPs can generate 1.17 mA/cm2 and 1.07 mA/cm2 at 1.2 V vs. Ag/AgCl, respectively. The low charge transportation rate inhibits the PEC performance of these NFs in water-splitting reactions. To mitigate this problem, the type-II heterojunction is constructed with optimized deposition of ZnWO4 on WO3, which favors the migration of charge-carriers in opposite directions, facilitating the charge-carrier separation and eventually enhancing the PEC activity. The optimized heterojunction shows a photocurrent density 1.5 times greater than bare WO3 and 2.4 times enhanced carrier density, 2.16×1021 cm-3. The heterostructure's rapid OCP decay and higher charge injection efficiency indicate an improved charge transport capability, the primary driving force for enhanced PEC activity. The stability of WO3/ZnWO4 is studied for one hour.
期刊介绍：
Chemistry—An Asian Journal is an international high-impact journal for chemistry in its broadest sense. The journal covers all aspects of chemistry from biochemistry through organic and inorganic chemistry to physical chemistry, including interdisciplinary topics.
Chemistry—An Asian Journal publishes Full Papers, Communications, and Focus Reviews.
A professional editorial team headed by Dr. Theresa Kueckmann and an Editorial Board (headed by Professor Susumu Kitagawa) ensure the highest quality of the peer-review process, the contents and the production of the journal.
Chemistry—An Asian Journal is published on behalf of the Asian Chemical Editorial Society (ACES), an association of numerous Asian chemical societies, and supported by the Gesellschaft Deutscher Chemiker (GDCh, German Chemical Society), ChemPubSoc Europe, and the Federation of Asian Chemical Societies (FACS).
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