Local Initiative Hydrogen Production by Aluminum Waste-Hot Spring Water Reaction

在研究活动方面，我们在实验室和现场设计中进行了铝废料和酸性地热温泉水反应产生氢气的基础研究。研究表明，强酸性、高温和含氯较高的温泉有效地破坏了铝表面的氧化层。因此，铝的表面形貌变得更加粗糙和孔洞，这使得水可以深入渗透，大大增强了铝与水的反应释放氢的活性。我们还进行了生命周期评估，以评估所研究体系的环境影响。因此，与使用汽油和原铝相比，使用来自铝废料的氢燃料-酸性温泉反应-减少了对环境的影响(即碳排放和能源消耗)。负的二氧化碳排放结果反映了温泉中和(取代石灰石投入)导致的减排。在研究成果方面，我们已经发表了期刊文章，开展了与未来研究方向相关的合作工作，并在学术会议上发表了演讲。目前，我们正在探索铝(和一些潜在金属)的处理方法，以有效地产生更多氢气，澄清可能的杂质，对系统进行技术经济评估，并准备演示文稿和相关出版物。

In terms of research activities, we have undertaken a fundamental study of aluminum waste and acidic geothermal hot spring water reactions for producing hydrogen in both lab-scale and onsite designs. The study revealed that strong acidity, elevated temperature, and higher chloride-containing hot springs effectively disrupted the aluminum surface's oxide layer. Therefore, aluminum's surface morphology became rougher and pitted, which allowed water to penetrate deeply and drastically enhanced aluminum reactivity with water to release hydrogen.We have also conducted a life cycle assessment to evaluate the environmental impact of the system studied. As a result, hydrogen fuel use from aluminum waste materials-acidic hot spring reactions reduced environmental impacts (i.e., carbon emission and energy consumption) compared to gasoline and primary aluminum use. The negative CO2 emission results reflected emission reduction due to hot spring neutralization (replacing limestone input).As for research output, we have published the journal article, performed collaborative work relevant to the future research direction, and made presentations at academic meetings.We are currently exploring treatments on aluminum (and some potential metals) to generate more hydrogen effectively, clarifying the possible impurities, working on a techno-economic assessment of the system, and preparing for presentations and relevant publications.