A thermally synergistic photo-electrochemical hydrogen generator operating under concentrated solar irradiation
| Autor: | Fredy Nandjou, Saurabh Yuvraj Tembhurne, Sophia Haussener |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment business.industry Energy conversion efficiency Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Fuel Technology chemistry Thermal Optoelectronics Hydrogen fuel enhancement 0210 nano-technology business Current density Hydrogen production Power density |
| Zdroj: | Nature Energy. 4:399-407 |
| ISSN: | 2058-7546 |
| DOI: | 10.1038/s41560-019-0373-7 |
| Popis: | Achieving high current densities while maintaining high energy conversion efficiency is one of the main challenges for enhancing the competitiveness of photo-electrochemical devices. We describe a concept that allows this challenge to be overcome by operating under concentrated solar irradiation (up to 474 kW m−2), using thermal integration, mass transport optimization and a close electronic integration between the photoabsorber and electrocatalyst. We quantify the increase in the theoretical maximum efficiencies resulting from thermal integration, and experimentally validate the concept using a III–V-based photoabsorber and IrRuOx–Pt-based electrocatalysts. We reach current densities higher than 0.88 A cm−2 at calculated solar-to-hydrogen conversion efficiencies above 15%. Device performance, dynamic response and stability are investigated, demonstrating the ability to produce hydrogen stably under varying conditions for more than two hours. The current density and output power (27 W) achieved provide a pathway for device scalability aimed towards the large-scale deployment of photo-electrochemical hydrogen production. For photo-electrochemical hydrogen production to become viable on a large scale, not only efficiency but also power density must be optimized. Here, the authors explore the impact of thermal integration on photo-electrochemical devices driven by concentrated solar irradiation and design one that operates with high efficiency and power density output. |
| Databáze: | OpenAIRE |
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