The synthesis of novel nitrogen-doped zinc tungstate (N-doped ZnWO4) perforated nanostructures and their photocatalytic activity for hydrogen production from water and rhodamine B degradation under direct sunlight have been demonstrated for the first time. ZnWO4 was synthesized by a simple hydrothermal method and doped with nitrogen by precise thermal treatment in the presence of thiourea to obtain perforated nanorods. The structural analysis carried out by X-ray diffractometry (XRD) and first principles density functional theory (DFT) based calculations shows a monoclinic structure. The microstructural and morphological studies show unique perforated nanorods with diameters of 2520 nm of N-doped ZnWO4. The substitution of nitrogen in place of oxygen atoms was confirmed by X-ray photoelectron spectroscopy (XPS). The effective substitution of nitrogen in ZnWO4 extends the absorption bands into the visible region. Hence, a computational study of N-doped ZnWO4 was also performed for the investigation and confirmation of its crystal and electronic structures. UV-DRS and analysis of the density of states (DOS) indicate a band gap of 2.4 experimentally and 2.9 eV theoretically. Considering the band structure, its functionality as a sunlight driven photocatalyst for water splitting and dye degradation has been investigated. N-Doped ZnWO4 exhibits enhanced photocatalytic activity towards hydrogen evolution (5862.1 mol h1 g1) for water splitting as well as RhB degradation under natural sunlight. The enhanced photocatalytic activity of N-doped ZnWO4 is attributed to extended absorbance in the visible region, which in turn generates more electronhole pairs responsible for higher H2 generation. DFT calculations suggest that the hybridization between O-2p and N-2p at the valence band edge is the reason for the narrowing band gap, and the degree of hybridization is likely to be increased with an increase in N doping which is responsible for the higher activity. The present investigation demonstrates a novel approach for the synthesis of perforated N-doped ZnWO4 with great prospects of scaling up and high yields.
Catalysis Science & Technology – Royal Society of Chemistry
Published: May 22, 2018
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera