TiO2-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting
| Autor: | Alexander E. Kobryn, Saralyn Riddell, Ajay P. Manuel, Karthik Shankar, Kazi M. Alam, Kenneth C. Cadien, Sergey Gusarov, Ryan Kisslinger, Sheng Zeng, Ehsan Vahidzadeh, Triratna Muneshwar, Pawan Kumar |
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| Rok vydání: | 2021 |
| Předmět: |
Nanotube
Materials science Band gap ultraviolet photoelectron spectroscopy TP1-1185 02 engineering and technology 010402 general chemistry 01 natural sciences 7. Clean energy Catalysis Nano transition metal nitrides FDTD electromagnetic simulations Physical and Theoretical Chemistry QD1-999 density functional theory Photocurrent business.industry Chemical technology hot carrier absorber Heterojunction 021001 nanoscience & nanotechnology 0104 chemical sciences Active layer Chemistry plasmonic catalysis Photocatalysis Water splitting Optoelectronics 0210 nano-technology business |
| Zdroj: | Catalysts Volume 11 Issue 11 Catalysts, Vol 11, Iss 1374, p 1374 (2021) |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal11111374 |
| Popis: | 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 TiO2 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−2 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. |
| Databáze: | OpenAIRE |
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