Two-Dimensional Perovskite Oxynitride K2LaTa2O6N with an H+/K+ Exchangeability in Aqueous Solution to Form Stable Photocatalyst for Visible-Light H2 Evolution

Angewandte Chemie
Takayoshi OshimaKazuhiko Maeda

Abstract

Two-dimensional (2D) undoped layered perovskite oxynitride materials have been suggested as potential visible-light-responsive photocatalysts; however, there have been few investigations on their use as photocatalysts because of the difficulty in synthesis and stability issues when in contact with water. Here, we demonstrate the synthesis of a new layered perovskite oxynitride, K2LaTa2O6N, as an exceptional example of a water-tolerant photocatalyst for H2 evolution under visible light. K2LaTa2O6N, prepared from KLaTa2O7 and K2CO3 as precursors, underwent in situ H+/K+ exchange in aqueous solution while keeping its visible light absorption capability. Thus protonated K2LaTa2O6N, K2-xHxLaTa2O6N, modified with an Ir cocatalyst, exhibited excellent catalytic activity toward H2 evolution in the presence of I- as an electron donor and under visible light irradiation; the activity was 6 times higher than Pt/ZrO2/TaON, one of the best-performing oxynitride photocatalysts for H2 evolution. Overall water splitting was also achieved using the Ir-loaded, protonated K2LaTa2O6N in combination with Cs-modified Pt/WO3 as an O2 evolution photocatalyst in the presence of I3-/I- shuttle redox couple. Undoped layered oxynitrides have not been cons...Continue Reading

References

Dec 8, 2004·Inorganic Chemistry·Gerard TobíasAmparo Fuertes
Mar 17, 2006·Nature·Kazuhiko MaedaKazunari Domen
Nov 23, 2006·Inorganic Chemistry·Amparo Fuertes
Apr 19, 2011·Chemical Communications : Chem Comm·Xu ZongLianzhou Wang
May 10, 2012·Journal of the American Chemical Society·Fuxiang ZhangKazunari Domen
Feb 25, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Takayoshi OshimaKazuhiko Maeda
Dec 22, 2017·Angewandte Chemie·Jeongsuk SeoKazunari Domen
Feb 24, 2018·Nature Communications·Hiroshi KageyamaKenneth R Poeppelmeier
Aug 19, 2018·Scientific Reports·Shunsuke YamashitaKoji Kimoto

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.