Exploration of rate-limiting factors and development of design guidelines for MH alloy systems

MH合金システムの速度律速因子の探求と設計指針の構築

To achieve the goal of a hydrogen society, a safer, more mass- and volume-efficient, and less expensive method of hydrogen storage is essential. The metal hydride alloys (MH alloys) are a safer alternative to high-pressure tanks, and the first step in using MH alloy systems is to increase the filling and releasing rates from MH alloy tanks. To this end, we will comprehensively examine the processes from the surface of MH alloy particles to the internal diffusion and phase change processes and clarify the rate-limiting factors of the MH alloy system. Then, we optimize the filling and releasing time to minimize the representative times for solid-phase diffusion, gas-phase diffusion, and heat transfer.

本研究は、水素社会実現に向けた安全かつ効率的な水素貯蔵方法の開発を目指しています。水素吸蔵合金（MH合金）を利用した場合、表面反応から内部拡散、相変化に至る各プロセスを総合的に解析し、システムの速度律速因子を明確化します。その上で、固相拡散、気相拡散、伝熱の時間スケールを最適化することで、充放出時間の短縮を実現します。