journal article·2024-07-31Open access

Enhanced Capability of Hydrogen Evolution Photocathode by Laminated Interface Engineering of Co/MoS2 QDs/pyramid-black Si

Weidong Cai, Zhixing Gan, Feng Nan, Shun Wang, Fuxiang Ji, Yiqiang Zhan

ACS Applied Materials & Interfaces· Volume 16· Issue 30

Abstract

We present a novel and stable laminated structure to enhance the performance and stability of silicon (Si) photocathode devices for photoelectrochemical (PEC) water splitting. First, by utilizing Cu nanoparticle catalysts to work on a n + p-black Si substrate via the metal-assisted chemical etching, we can achieve the black silicon with a porous pyramid structure. The low depth holes on the surface of the pyramid caused by Cu etching not only help enhance the light capture capability with quite low surface reflectivity (<5%) but also efficiently protect the p–n junction from damage. To improve the charge migration efficiency and mitigate parasitic light absorption from cocatalysts at the same time, we drop casted quantum dots (QDs) MoS 2 with the size of nanometer scale as the first layer of catalyst. Hence, we then can safely electrodeposit cocatalyst Co nanoparticles to further enhance interface transfer efficiency. The synergistic effects of cocatalysts and optimized light absorption from the morphology and QDs contributed to the overall enhancement of PEC performance, offering a promising pathway for an efficient, low cost, and stable (over 100 h) hydrogen production photocathode.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Chalcogenide Semiconductor Thin Films · Nanowire Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center of Micro-Nano System, School of Information Science and Technology, Fudan University, Shanghai 200438, China

Center for Future Optoelectronic Functional Materials, School of Computer and Electronic Information/School of Artificial Intelligence, Nanjing Normal University, Nanjing 210023, China

Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huai’an 223003, China

School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou 215006, China

Institute of Computational Physics, Zurich University of Applied Sciences, Technikumstrasse 71, Winterthur 8400, Switzerland

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Guangdong Provincial Key Laboratory of Materials and Technology for Energy Conversion, Guangdong Technion - Israel Institute of Technology · Key Laboratory of Rare Earths, Chinese Academy of Sciences

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