Solar thermochemical splitting of water to generate hydrogen

Proceedings of the National Academy of Sciences of the United States of America
C N R Rao, Sunita Dey

Abstract

Solar photochemical means of splitting water (artificial photosynthesis) to generate hydrogen is emerging as a viable process. The solar thermochemical route also promises to be an attractive means of achieving this objective. In this paper we present different types of thermochemical cycles that one can use for the purpose. These include the low-temperature multistep process as well as the high-temperature two-step process. It is noteworthy that the multistep process based on the Mn(II)/Mn(III) oxide system can be carried out at 700 °C or 750 °C. The two-step process has been achieved at 1,300 °C/900 °C by using yttrium-based rare earth manganites. It seems possible to render this high-temperature process as an isothermal process. Thermodynamics and kinetics of H2O splitting are largely controlled by the inherent redox properties of the materials. Interestingly, under the conditions of H2O splitting in the high-temperature process CO2 can also be decomposed to CO, providing a feasible method for generating the industrially important syngas (CO+H2). Although carbonate formation can be addressed as a hurdle during CO2 splitting, the problem can be avoided by a suitable choice of experimental conditions. The choice of the solar r...Continue Reading

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Citations

Dec 13, 2017·Proceedings of the National Academy of Sciences of the United States of America·Pablo G Debenedetti, Michael L Klein
Jan 15, 2020·Nanoscale Research Letters·Weiren XiaXinhua Zhu
Jul 13, 2018·Materials·Jiawei HuGuy B Marin
Feb 11, 2021·Journal of the American Chemical Society·Rishi G AgarwalJames M Mayer
Nov 22, 2019·Nano-micro Letters·Aslam HossainSanjay Roy
Dec 29, 2020·ACS Biomaterials Science & Engineering·Kamaljit KaurVijayakumar Shanmugam

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