TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting

The lack of active, stable, earth-abundant, and visible-light absorbing materials to replace plasmonic noble metals is a critical obstacle for researchers in developing highly efficient and cost-effective photocatalytic systems. Herein, a core–shell nanotube catalyst was fabricated consisting of ato...

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Autores principales:	Sheng Zeng, Triratna Muneshwar, Saralyn Riddell, Ajay Peter Manuel, Ehsan Vahidzadeh, Ryan Kisslinger, Pawan Kumar, Kazi Mohammad Monirul Alam, Alexander E. Kobryn, Sergey Gusarov, Kenneth C. Cadien, Karthik Shankar
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	plasmonic catalysis hot carrier absorber ultraviolet photoelectron spectroscopy density functional theory FDTD electromagnetic simulations transition metal nitrides Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/58f04f07932f470f9384114678bc21cb
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spelling	oai:doaj.org-article:58f04f07932f470f9384114678bc21cb2021-11-25T17:06:28ZTiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting10.3390/catal111113742073-4344https://doaj.org/article/58f04f07932f470f9384114678bc21cb2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1374https://doaj.org/toc/2073-4344The lack of active, stable, earth-abundant, and visible-light absorbing materials to replace plasmonic noble metals is a critical obstacle for researchers in developing highly efficient and cost-effective photocatalytic systems. Herein, a core–shell nanotube catalyst was fabricated consisting of atomic layer deposited HfN shell and anodic TiO<sub>2</sub> support layer with full-visible regime photoactivity for photoelectrochemical water splitting. The HfN active layer has two unique characteristics: (1) A large bandgap between optical and acoustic phonon modes and (2) No electronic bandgap, which allows a large population of long life-time hot carriers, which are used to enhance the photoelectrochemical performance. The photocurrent density (≈2.5 mA·cm<sup>−2</sup> at 1 V vs. Ag/AgCl) obtained in this study under AM 1.5G 1 Sun illumination is unprecedented, as it is superior to most existing plasmonic noble metal-decorated catalysts and surprisingly indicates a photocurrent response that extends to 730 nm. The result demonstrates the far-reaching application potential of replacing active HER/HOR noble metals such as Au, Ag, Pt, Pd, etc. with low-cost plasmonic ceramics.Sheng ZengTriratna MuneshwarSaralyn RiddellAjay Peter ManuelEhsan VahidzadehRyan KisslingerPawan KumarKazi Mohammad Monirul AlamAlexander E. KobrynSergey GusarovKenneth C. CadienKarthik ShankarMDPI AGarticleplasmonic catalysishot carrier absorberultraviolet photoelectron spectroscopydensity functional theoryFDTD electromagnetic simulationstransition metal nitridesChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1374, p 1374 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	plasmonic catalysis hot carrier absorber ultraviolet photoelectron spectroscopy density functional theory FDTD electromagnetic simulations transition metal nitrides Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	plasmonic catalysis hot carrier absorber ultraviolet photoelectron spectroscopy density functional theory FDTD electromagnetic simulations transition metal nitrides Chemical technology TP1-1185 Chemistry QD1-999 Sheng Zeng Triratna Muneshwar Saralyn Riddell Ajay Peter Manuel Ehsan Vahidzadeh Ryan Kisslinger Pawan Kumar Kazi Mohammad Monirul Alam Alexander E. Kobryn Sergey Gusarov Kenneth C. Cadien Karthik Shankar TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting
description	The lack of active, stable, earth-abundant, and visible-light absorbing materials to replace plasmonic noble metals is a critical obstacle for researchers in developing highly efficient and cost-effective photocatalytic systems. Herein, a core–shell nanotube catalyst was fabricated consisting of atomic layer deposited HfN shell and anodic TiO<sub>2</sub> support layer with full-visible regime photoactivity for photoelectrochemical water splitting. The HfN active layer has two unique characteristics: (1) A large bandgap between optical and acoustic phonon modes and (2) No electronic bandgap, which allows a large population of long life-time hot carriers, which are used to enhance the photoelectrochemical performance. The photocurrent density (≈2.5 mA·cm<sup>−2</sup> at 1 V vs. Ag/AgCl) obtained in this study under AM 1.5G 1 Sun illumination is unprecedented, as it is superior to most existing plasmonic noble metal-decorated catalysts and surprisingly indicates a photocurrent response that extends to 730 nm. The result demonstrates the far-reaching application potential of replacing active HER/HOR noble metals such as Au, Ag, Pt, Pd, etc. with low-cost plasmonic ceramics.
format	article
author	Sheng Zeng Triratna Muneshwar Saralyn Riddell Ajay Peter Manuel Ehsan Vahidzadeh Ryan Kisslinger Pawan Kumar Kazi Mohammad Monirul Alam Alexander E. Kobryn Sergey Gusarov Kenneth C. Cadien Karthik Shankar
author_facet	Sheng Zeng Triratna Muneshwar Saralyn Riddell Ajay Peter Manuel Ehsan Vahidzadeh Ryan Kisslinger Pawan Kumar Kazi Mohammad Monirul Alam Alexander E. Kobryn Sergey Gusarov Kenneth C. Cadien Karthik Shankar
author_sort	Sheng Zeng
title	TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting
title_short	TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting
title_full	TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting
title_fullStr	TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting
title_full_unstemmed	TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting
title_sort	tio<sub>2</sub>-hfn radial nano-heterojunction: a hot carrier photoanode for sunlight-driven water-splitting
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/58f04f07932f470f9384114678bc21cb
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TiO<sub>2</sub>-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting

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