Today' s energy crisis is delivering a shock of unprecedented breadth and complexity. The biggest tremors have been felt in the markets for natural gas， coal and electricity with significant turmoil in oil markets as well. Moreover，the supply of electricity from clean energy sources must double within the next eight years to limit global temperature increase. Otherwise， there is a risk that climate change， more extreme weather and water stress will undermine our energy security and even jeopardize renewable energy supplies， according to a new multi-agency report from the World Meteorological Organization （WMO）.Solar photovoltaics and hydrogen energy have been the most promising candidates for clean energy. However，its preparation process needs to be promoted to improve the practical application efficiency.lt is urgent to study the related phase equilibria， thermodynamics and alloying principles，contributing to the improvement of the fundamental study for the solar photovoltaics and hydrogen energy materials system.

　　The purpose of the book aims to obtain a thermodynamic database capable of describing all experimental data available up to date. The book provides the thermodynamic parameters for the renewable energy materials systems which can be used as reference for scientific and technical

　　personnel in its fields. This study provides a set of reliable thermodynamic parameters to solar photovoltaic materials and hydrogen storage materials thermodynamic database，and a cost-effective tool to design experiments and manufacturing processes for solar photovoltaic alloys and hydrogen storage alloys.

　　The authors are grateful to the Cooperation Project of Jiangxi Provincial International Science and Technology( 20212BDH81001），the publication of this book is financially supported by the National Natural Science Foundation of China Project( 52264042），the China Postdoctoral Science Foundation Funding(2021M690975）， the Jiangxi Provincial Natural Science Foundation (20212BDH81001， 20212BAB214023， 20223AAG01009，20214BBG74005），Opening Research Projects of State Key Laboratory of Advanced Metallurgy(K22-03 & 04），Research Project from Xiangtan Iron and Steel Corporation of Hunan Hualing， Nanchang 100-100 Plan Foundation， and the Publication Funding of Jiangxi University of Science and Technology.ln addition， special thanks are given to Prof.Yansong Shen in UNSW，Prof. Zhenmin Du and Prof. Cuiping Guo in USTB for their great help and supports in the process of writing and compiling.

　　There might be some mistakes and shortcomings in this book due to the authors' limited professional knowledge and the preparation time. Please do not hesitate to correct us.