Efficient photocatalytic hydrogen production over Ni@C/TiO2 nanocomposite under visible light irradiation

Ni-based photocatalytic H2-production cocatalysts2

“…This work highlights the potential application of a highly active and low-cost Ni@C core-shell structure with significant nanoconfinement effect in boosting photocatalytic H2 evolution. Similarly, C- [277][278][279][280] and NiO- [234,[282][283][284]coated core-shell cocatalysts have also been extensively employed to enhance the photocatalytic H2 evolution over other photocatalyst systems. It is expected that greater attention should be paid to enhanced photocatalysis based on Ni-based cocatalysts with excellent nanoconfinement effects in future studies.…”

Photodegradation of Polyphenols and Aromatic Amines in Olive Mill Effluents with Ni Doped C/TiO2

“…The photocatalytic performance of the synthesized catalyst sample which is combined with three different C/TiO 2 /Ni mass ratios of 1%/2%/5%, 5%/1%/2%, and 2%/5%/1%. The maximum photodegradation efficiency was obtained at 2%/5%/1% mass ratio of Ni/C/TiO 2 which is the maximum carbon which can act as photosensitizer, absorbing the UV and sun lights, which can inject the photogenerated electrons into TiO 2 conduction band as mentioned in the study performed by Zeng et al [15] (Table 2). In other words, the interfacial behavior between C and TiO 2 may increase the photogenerated electron mobility in TiO 2 .…”

“…The photocatalytic degradation removal at darkness condition was found as 33% for MB removal while the MB photodegradation removal was found as 98%, at 500 W UV light, after 150 min at TiO 2 /C mass ratio of 0.902, at 25 ∘ C. The Ni/TiO 2 photocatalysts with a content of Ni about 1.5 mol% photodegraded 0.025 g L −1 of methyl orange with a removal efficiency of 87% [14]. On the other hand, C/Ni/TiO 2 nanocomposite is a new class of photocatalyst in CO 2 photoreduction under visible light irradiation [15]. Gondal et al [9] found 81% removal efficiency for methyl orange by using 0.5 g L −1 C 10 %/TiO 2 /Ni under 6 W UV light ( = 464 nm), at 0.4 g L −1 initial Ni concentration, and a C/TiO 2 ratio of 0.08 ratio, after 120 min, at 27 ∘ C, respectively.…”

“…The aim of this study was the synthesis of PAC on Ni/TiO 2 as a new class of photocatalyst for the removal pollutants in the OMW (COD components, polyphenols, and TAAs metabolites). The effects of mass ratios of C/TiO 2 /Ni (1%/2%/5%; 5%/1%/2%; and 2%/5%/1%), the effects of increasing concentrations of C/TiO 2 /Ni nanocomposites (100, 250, 500, and 1000 mg L −1 ), increasing photoretention times (15,30,45,60,75,120, and 180 min), increasing pH values (3.5, 4.0, 7.0, and 10.0), and increasing temperatures (15,25,50, and 80 ∘ C) on the pollutant parameters of OMW were studied at 300 W UV light and at 30 W sunlight irradiations.…”

Preparation of Ni@C–Cd0.8Zn0.2S nanocomposites with highly efficient and stable photocatalytic hydrogen production activity

“…28 Recently, an integrated strategy was employed by our group to prepare visible light-induced semiconducting metal oxide or sulphide nanocomposites by incorporating carbon-coated Ni (Ni@C) nanoparticles as a co-catalyst. It was found that the obtained nanocomposites exhibited considerable stability and photoactivity for H 2 production, 29,30 and the carbon encapsulation strategy can not only utilize the metallic Ni in Ni@C as a co-catalyst, but also the graphite-like carbon coating as the semiconductor nanoparticles' support and electron acceptor, and consequently leading to efficient charge separation and high stability both for the sulphide and metallic Ni co-catalyst. 30 Herein, Cd 0.8 Zn 0.2 S was selected as the photocatalyst subject because this solid solution with a Cd/Zn atomic ratio of 4 has the maximum photoactivity for H 2 production according to the previous reports, 4,15 and a series of Ni@C-Cd 0.8 Zn 0.2 S nanocomposites with different Ni@C contents was prepared via a facile hydrothermal process by using a pre-prepared Ni@C as the starting material.…”