Hydroxy Acid-Assisted Synthesis of Highly Dispersed Ni-NiS on CdS as Effective Photocatalyst for Hydrogen Evolution
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Hydroxy Acid‑Assisted Synthesis of Highly Dispersed Ni‑NiS on CdS as Effective Photocatalyst for Hydrogen Evolution Hong Wang1 · Yaoyao Li1 · Zhongying Liu1 · Jiawang Liu1 · Renchun Yang1 Received: 20 July 2020 / Accepted: 28 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract To achieve the well-dispersed Ni–NiS dual-cocatalysts anchored CdS, the samples have been successfully constructed by a cheap and convenient method of hydroxy acid assisted hydrothermal method. Based on the coordination and reduction effects of hydroxy acids, Ni2+ can be facilely transformed into the high dispersed dual-function sites of Ni0 electrons trap and NiS holes reservoir. The highly dispersed Ni–NiS dual-cocatalysts not only provide more dual-function active sites but also present distinctly enhanced visible light absorption, effectively separated electron hole pairs and quickly migrated charge carriers. The optimized Ni–NiS/CdS–CA presented an excellent photocatalytic H 2 generation rate of 57.88 mmol·h−1·g−1, which is about 15.35 times higher than that of NiS/CdS. Moreover, the stability can be distinctly increased by modulating the surface cover of Ni–NiS with a suitable Ni/(Ni + Cd) atomic ratio. This work would provide a unique strategy to design the high effective photocatalysts with high dispersed bi-function dual cocatalysts. Graphic Abstract The well-dispersed Ni-NiS dual-cocatalysts anchored CdS in situ have been successfully constructed via the coordination and reduction effects of hydroxy acid assisted hydrothermal method. Ni-NiS/CdS-CA not only presents dual-function active sites but also exhibits distinctly enhanced visible light absorption, effectively separated electron hole pairs and quickly migrated charge carriers, resulting in a remarkable enhancement in photocatalytic H2 evolution activity.
Keywords CdS · Ni-NiS · Dual-cocatalysts · Well-dispersed · Photocatalytic H2 evolution
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03408-4) contains supplementary material, which is available to authorized users. * Renchun Yang [email protected] 1
Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Polytechnic University, Wuhu 241000, China
1 Introduction To solve the environmental and energy problems, photocatalytic H2 generation from water splitting has been predicted as an effective and green approach to confront the global crisis [1–4]. Thus, the development of highly effective photocatalysts is of the essence for converting solar energy. In this context, various photocatalysts with different components have been constructed [3, 5–9]. Among them, CdS,
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has been a focused material owing to its perfect band gap (2.4 eV) and feasible band position [10–13]. Nevertheless, substantive studies have confirmed that the stubborn photocorrosion and ultrafast charge carrier recombination have become two fatal limitations of pure CdS, which hampe
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