Thermodynamic analysis on CSP integrated cerium oxide (CeO2 − CeO1.72/1.83) water splitting cycle for hydrogen production


Sharma J.P. Kumar R. Ahmadi M.H. Najser J. Blazek V. Prokop L. Assel Akanovna Z. Sarsenbayev Y.
31 January 2024Elsevier Ltd

International Journal of Hydrogen Energy
2024#531259 - 1268 pp.

Solar thermochemical CeO2-based H2O splitting cycle was thermodynamically analyzed to ascertain the optimal thermal reduction (TH) and re-oxidation (TL) temperatures and evaluate the solar-to-fuel conversion efficiency (ηsolar−to−fuel) of the cycle. The equilibrium composition of CeO2, CeO1.72, CeO1.83 and O2 exhibited that the thermal reduction initiated at 1400 K thereby attaining 100 % TR at 2734 K. The observed variations in Gibbs free energy (ΔG) correspond to the feasibility of the re-oxidation step of CeO1.83 and CeO1.72 at 1050 K and 1200 K respectively. It was reported that the absorption efficiency of solar reactor (ηabs−solar−reactor−WS) decreases from 95.6 % to 37 %, as the TH increases from 1400 K to 2734 K. The results show that ηsolar−to−fuel reached the maximum value of 7.45 % for CeO1.72 and 7.69 % for CeO1.83 at 61.72 % TR of CeO2 without heat recuperation. Further, the ηsolar−to−fuel attained the maximum value of 14.92 % and 13.54 % for CeO1.83 and CeO1.72, respectively at the %TR of CeO2 of 80 % with 50 % heat recuperation. The solar-to-fuel conversion efficiency (ηsolar−to−fuel) further can be increased with the optimization of oxygen partial pressure (PO) and molar flow rate of reduction regents (Ar or N2).

Cerium oxide , Hydrogen production , Solar thermochemical , Thermodynamic analysis , Water-splitting

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School of Mechanical Engineering, Lovely Professional University, Punjab, India
Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
ENET Centre, VSB—Technical University of Ostrava, Ostrava, 708 00, Czech Republic
Satbayev University, Department of Power Engineering Almaty, 22a Satpaev Str., Almaty, 050013, Kazakhstan

School of Mechanical Engineering
Faculty of Mechanical Engineering
ENET Centre
Satbayev University

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