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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Thermodynamics analysis of hydrogen production via NiFe2O4/NiO-FeO redox reaction

Huang Xing
School of Energy science and engineering, Harbin Institute of Technology,Harbin, China

Hong Jiarong
School of Energy science and engineering, Harbin Institute of Technology,Harbin, China

Yuan Yuan
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R. China

Shuai Yong
School of Energy science and engineering, Harbin Institute of Technology,Harbin, China

Li Bingxi
School of Energy science and engineering, Harbin Institute of Technology,Harbin, China

Tan Heping
School of Energy science and engineering, Harbin Institute of Technology,Harbin, China

Abstract

Among the redox materials used in solar thermochemical hydrogen production, MFe2O4 (M=Ni, Co, Cu, Zn, etc) redox pair is a promising candidate for solar thermo-chemical hydrogen production since its relatively low dissociation temperature, good redox performance and high hydrogen yield. In this study, second law of thermodynamics was employed to analysis the system cycle efficiency and solar-to-fuel conversion efficiency at different operating parameters based on an ideal NiFe2O4/NiO-FeO solar thermochemical redox reaction. Firstly, co-precipitation method is employed to synthesize the NiFe2O4 particles and some characterization techniques are also employed to analyze its purity and porosity. Secondly, an ideal hydrogen production cyclic process is built based on NiFe2O4/NiO-FeO solar thermochemical redox reactions. Lastly, the system efficiency and solar-to-fuel conversion efficiency are analyzed at different operating parameters based on the cyclic process. The results showed that the initial temperature of the reaction particles has little effect on system efficiency and solar-to-fuel conversion efficiency. When the reaction required large amount of inert gas, the increasing in initial temperature of the inert gas would increase the system efficiency and solar-to-fuel conversion efficiency. As the amount of inert gas decreased, the increasing in initial temperature of the inert gas has little effect on overall efficiency and solar-to-fuel conversion efficiency. The system efficiency of sytem react with CO2 is higher than that with H2O, but the solar-to-fuel conversion efficiency is lower than that with H2O. The above results will give a detailed guide on how to get a maximum solar-to-fuel efficiency during the experimental process.

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