# Nitrogen-Doped Zinc Oxide for Photo-Driven Molecular Hydrogen Production.
> 光駆動型水素生成のための窒素ドープ酸化亜鉛光触媒の開発


## Abstract

Zinc oxide (ZnO) is a widely investigated semiconductor for photocatalysis owing to its thermal stability, high exciton binding energy, and electron mobility, yet its broad bandgap restricts photoactivity to the UV range. This study introduced nitrogen dopants into the ZnO lattice via a green synthetic route to create localized defect states within the bandgap, thereby extending optical response into the visible spectrum and lowering the energy threshold for photoinduced charge separation. Systematic variation of thermal treatment temperature during synthesis revealed that the processing conditions govern the microscopic nature of the resulting defects and, consequently, whether the material favors oxidative or reductive chemistry. Materials prepared at lower temperatures exhibited superior efficiency in photocatalytic water splitting for molecular hydrogen production. These findings advance the development of N-doped ZnO as a candidate photocatalyst for artificial photosynthesis applications.

### Mechanism

Nitrogen doping introduces localized defect states within the ZnO bandgap, enabling visible-light-driven charge separation and subsequent photocatalytic water splitting to yield molecular hydrogen.

## Bibliographic

- **Authors**: Cerrato E, Privitera A, Chiesa M, Salvadori E, Paganini MC
- **Journal**: Int J Mol Sci
- **Year**: 2022 (2022-05-07)
- **PMID**: [35563612](https://pubmed.ncbi.nlm.nih.gov/35563612/)
- **DOI**: [10.3390/ijms23095222](https://doi.org/10.3390/ijms23095222)
- **PMC**: [PMC9100422](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9100422/)
- **Study type**: other
- **Delivery route**: not specified
- **Effect reported**: not assessed

## Delivery context

The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).

## Safety notes

The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).

See also:
- [Inhalation concentration and LFL / UFL](https://h2-papers.org/en/safety-notes/inhalation-concentration)
- [Consumer Affairs Agency accident cases](https://h2-papers.org/en/safety-notes/accident-cases)

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> **Cite as**: H2 Papers — PMID 35563612. https://h2-papers.org/en/papers/35563612
> **Source**: PubMed PMID [35563612](https://pubmed.ncbi.nlm.nih.gov/35563612/)