Enhanced Charge Transportation in Type II WO3/ZnWO4 Nanoflakes for Boosting Saline Water-splitting Reaction

IF 3.3 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Chemistry - An Asian Journal Pub Date : 2025-03-08 DOI:10.1002/asia.202500292

Prashant Choubey, Ritu Verma, Mrinmoyee Basu

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Abstract

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 WO_3, 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.

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增强ⅱ型WO3/ZnWO4纳米片的电荷输运促进盐水分解反应。

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。

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来源期刊

Chemistry - An Asian Journal 化学-化学综合

CiteScore

7.00

自引率

2.40%

发文量

535

审稿时长

1.3 months

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).