期刊
ACS APPLIED NANO MATERIALS
卷 4, 期 5, 页码 4441-4451出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c03484
关键词
nanoparticle cocatalyst; photodeposition; nickel; platinum; black TiO2-x; hydrogen
资金
- DST-INSPIRE Faculty scheme [IFA17-MS107]
- National Research Foundation - Ministry of Science, ICT and Future Planning, Korea [2019K2A9A1A06100164, 2019R1A2C2086770]
This study presents a new approach to photoassisted hydrogen generation using a Ni-based cocatalyst with a small amount of Pt, which exhibits better charge separation efficiency and hydrogen generation rate compared to a Pt-only cocatalyst in the photodegradation of methanol-water.
A cocatalyst plays an essential role in photoassisted hydrogen generation, and it is an almost inevitable component of a photocatalyst. Costly noble metal (e.g., Pt) cocatalysts exhibit almost irreplaceable efficiencies, and finding a suitable replacement is a challenging proposition. Controlled synthesis of a nanoparticle cocatalyst on semiconductors at the nanoscale level is one of the most promising approaches to accomplish the Pt equivalent activity. Herein, a photodeposited metallic Ni-based cocatalyst containing a small amount of Pt (<2 atom % with respect to Ni) on reduced/black TiO2-x is introduced. The developed cocatalyst (2.21 wt % Ni and 0.094 wt % Pt with respect to TiO2-x) exhibits better charge separation efficiency and photoassisted hydrogen generation rate than an only-Pt (0.91 wt %) cocatalyst from methanol-water. The rates are 69 and 3.1 mmol g(-1) h(-1) for a Ni-based cocatalyst, while 65 and 2.5 mmol g(-1) h(-1) for a Pt cocatalyst, respectively, under ultraviolet-visible and visible light. A small amount of Pt ensures the photodeposition of Ni nanoparticles adjacent to Pt nanoparticles, enhancing the charge migration from the reduced TiO2-x surface for hydrogen evolution. It is found that in the absence of Pt, the photodeposited Ni(OH)(2) is obtained instead of metallic Ni nanoparticles, which exhibits a comparatively low hydrogen generation rate. The present study opens an alternative way to cocatalyst design and fabrication by the controlled synthesis of nanoparticles for a wide range of photocatalytic conversions facilitated by enhanced charge separation.
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