Živalj Edin, Belec Blaž, Valant Matjaz
Materials Research Laboratory, University of Nova Gorica, Vipavska 13, 5000 Nova Gorica, Slovenia.
ACS Omega. 2025 Jul 3;10(27):29143-29153. doi: 10.1021/acsomega.5c01711. eCollection 2025 Jul 15.
Thermochemical cycles for hydrogen production involve a series of reactions, with water decomposition as the net result. One of the reactions frequently encountered in these cycles is the reverse Deacon reaction, where chlorine reacts with water vapor to form hydrogen chloride at high temperatures. An alternative, lower-temperature approach involves introducing chlorine to liquid water, yielding hydrochloric acid and hypochlorous acid. The hypochlorous acid can be further decomposed to hydrochloric acid and oxygen by catalytically induced reaction. The catalytic activity of ruthenium and iridium oxide nanopowders, along with UV light, was investigated for the decomposition of hypochlorous acid. Using Raman spectroscopy and mass spectrometry, we demonstrated that both catalysts facilitate decomposition to oxygen, while UV light promotes decomposition to chlorate ions. Ruthenium-(IV) oxide exhibited superior catalytic activity compared to iridium-(IV) oxide in both alkaline and acidic media. Both catalysts showed excellent recyclability, maintaining consistent activity after five consecutive tests. Structural stability was confirmed via XRD, Raman spectroscopy, and TEM analysis.
用于制氢的热化学循环涉及一系列反应，最终结果是水分解。这些循环中经常遇到的反应之一是逆迪肯反应，即氯在高温下与水蒸气反应生成氯化氢。另一种较低温度的方法是将氯引入液态水，生成盐酸和次氯酸。次氯酸可通过催化诱导反应进一步分解为盐酸和氧气。研究了钌和氧化铱纳米粉末以及紫外光对次氯酸分解的催化活性。通过拉曼光谱和质谱，我们证明了两种催化剂都有助于分解为氧气，而紫外光促进分解为氯酸根离子。在碱性和酸性介质中，二氧化钌（IV）均表现出优于氧化铱（IV）的催化活性。两种催化剂均表现出优异的可回收性，在连续五次测试后保持一致的活性。通过X射线衍射、拉曼光谱和透射电子显微镜分析证实了结构稳定性。
