Enhanced carrier transport in Wurtzite-Sphalerite phase Engineered CdS integrated with CoBOx for High-Performance photoelectrochemical water oxidation

IF 5.9 3区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY
Thangavel Sakthivel, Ji Woong Chang
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Abstract

In this work, to dwindle bulk recombination we designed a multi-phase (wurtzite-sphalerite) mCdS (sphere, wire and plate) heterostructure through a novel cation exchange approach. Then customize the mCdS surface with amorphous CoBOx as an oxygen evolution cocatalyst (OEC) to improve the hole utilization and reduce the surface recombination. Plates like mCdS@a-CoBOx photoanodes delivered a significant photocurrent density 1.6 mA cm−2 at 1.23 V, which is approximately fourfold higher with respect to unmodified mCdS plates. The applied bias photon-current-efficiency of plates mCdS@a-CoBOx also improved two-fold compared to bare mCdS plates. Internal phase junction in mCdS substantially reduces the photoelectron-hole recombination due to the different work functions in wurtzite-sphalerite. Decorated a-CoBOx reduces surface recombination, improves migration, uplifts the electrochemical active surface area, and expedited the hole transfer from CdS to active site a-CoBOx. The structural and chemical characteristics of the photoanode are studied by XRD, XPS, FE-SEM, Cs-TEM and water contact angle. In addition to this, the optoelectronic properties were studied using UV-DRS, Mott-schotty and P-EIS technique. This study paves the way for designing single step synthesis phase junction photoanodes and their OEC modifications to secure high efficiency.

Abstract Image

集成了CoBOx的工程CdS用于高性能光电化学水氧化
在这项工作中,我们通过一种新的阳离子交换方法设计了一种多相(纤锌矿-闪锌矿)mCdS(球体、线状和板状)异质结构,以减少体复合。然后用无定形CoBOx作为析氧助催化剂(OEC)定制mcd表面,提高孔洞利用率,减少表面复合。像mCdS@a-CoBOx光阳极这样的板在1.23 V时提供了1.6 mA cm - 2的显著光电流密度,这大约是未修饰的mcd板的四倍。应用偏置光子电流效率mCdS@a-CoBOx板也提高了两倍比裸mCdS板。由于纤锌矿-闪锌矿的功函数不同,mcd中的内相结大大降低了光电子-空穴复合。修饰后的a-CoBOx减少了表面复合,改善了迁移,提高了电化学活性表面积,加速了从CdS到活性位点a-CoBOx的空穴转移。采用XRD、XPS、FE-SEM、Cs-TEM和水接触角等方法研究了光阳极的结构和化学特性。此外,利用UV-DRS、Mott-schotty和P-EIS技术对其光电性能进行了研究。本研究为设计单步合成相结光阳极及其OEC修饰以获得高效率奠定了基础。
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来源期刊
CiteScore
10.40
自引率
6.60%
发文量
639
审稿时长
29 days
期刊介绍: Journal of Industrial and Engineering Chemistry is published monthly in English by the Korean Society of Industrial and Engineering Chemistry. JIEC brings together multidisciplinary interests in one journal and is to disseminate information on all aspects of research and development in industrial and engineering chemistry. Contributions in the form of research articles, short communications, notes and reviews are considered for publication. The editors welcome original contributions that have not been and are not to be published elsewhere. Instruction to authors and a manuscript submissions form are printed at the end of each issue. Bulk reprints of individual articles can be ordered. This publication is partially supported by Korea Research Foundation and the Korean Federation of Science and Technology Societies.
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