Objective To address the challenge of renewable energy curtailment under China's "dual carbon" goals, this study explores the optimal technology selection for hydrogen storage systems, a key link in the "power-to-hydrogen-to-chemicals" pathway. Focusing on integrated wind-solar-hydrogen-chemical projects, this paper aims to evaluate different technical routes for solid-state hydrogen storage and establish a framework of key performance indicators to guide system selection for large-scale green chemical applications.

Method A comprehensive comparative analysis was conducted on three major types of solid-state hydrogen storage materials: rare-earth-based, titanium-based, and magnesium-based alloys. Considering the operational characteristics of water electrolysis and chemical synthesis processes, an evaluation framework comprising 10 key performance indicators—including operating temperature and pressure, hydrogen density, cycle life, and safety—was established to systematically assess the performance of each technology.

Result The analysis reveals that titanium-based hydrogen storage alloys exhibit the most balanced performance across hydrogen storage density, operating pressure, cycle life, and raw material availability, demonstrating the greatest potential for large-scale industrial application. The proposed indicator framework provides a quantitative basis for selecting the optimal hydrogen storage system.

Conclusion The titanium-based solid-state hydrogen storage route is identified as the optimal choice in terms of its techno-economic feasibility and engineering viability for large-scale green chemical scenarios. The established 10 key performance indicators framework offers critical technical support for the scientific selection of storage systems in integrated wind-solar-hydrogen-chemical projects, providing valuable guidance for advancing system integration and carbon reduction efficiency in the "power-to-hydrogen-to-chemicals" value chain.