Photoenhanced Water Electrolysis in Separate O 2 and H 2 Cells Using Pseudocapacitive Electrodes.

Autor: Musikajaroen S; Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.; Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok 10400, Thailand., Polin S; Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand., Sattayaporn S; Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand., Jindata W; Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand., Saenrang W; Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.; Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok 10400, Thailand., Kidkhunthod P; Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand., Nakajima H; Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand., Butburee T; National Nanotechnology Center, National Science and Technology Development Agency, 111 Thailand Science Park, Pathum Thani 12120, Thailand., Chanlek N; Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand., Meevasana W; Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.; Thailand Center of Excellence in Physics, Ministry of Higher Education, Science, Research and Innovation, 328 Si Ayutthaya Road, Bangkok 10400, Thailand.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2021 Jul 21; Vol. 6 (30), pp. 19647-19655. Date of Electronic Publication: 2021 Jul 21 (Print Publication: 2021).
DOI: 10.1021/acsomega.1c02305
Abstrakt: Water electrolysis has received much attention in recent years as a means of sustainable H 2 production. However, many challenges remain in obtaining high-purity H 2 and making large-scale production cost-effective. This study provides a strategy for integrating a two-cell water electrolysis system with solar energy storage. In our proposed system, CuO-Cu(OH) 2 /Cu 2 O was used as a redox mediator between oxygen and hydrogen evolution components. The system not only overcame the gas-mixing issue but also showed high gas generation performance. The redox reaction (charge/discharge) of CuO-Cu(OH) 2 /Cu 2 O led to a significant increase (51%) in the initial rate of H 2 production from 111.7 μmol h -1 cm -2 in the dark to 168.9 μmol h -1 cm -2 under solar irradiation. The effects of light on the redox reaction of CuO-Cu(OH) 2 /Cu 2 O during water electrolysis were investigated by in situ X-ray absorption and photoemission spectroscopy. These results suggest that surface oxygen vacancies are created under irradiation and play an important role in increased capacitance and gas generation. These findings provide a new path to direct storage of abundant solar energy and low-cost sustainable hydrogen production.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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