Nikitenko Sergey I, Chave Tony
Institut de Chimie Separative de Marcoule, ICSM, Univ. Montpellier, CEA, CNRS, ENSCM, 30207, Marcoule, France.
ChemSusChem. 2025 Sep 23;18(18):e202500627. doi: 10.1002/cssc.202500627. Epub 2025 Jul 9.
Green hydrogen is a pillar for achieving global decarbonization and the reduction of greenhouse gas emissions. Here, a new, nature-inspired process for green hydrogen production using virtually unlimited natural resources is reported. Olivine, the most abundant mineral in the Earth's upper mantle, is key to this process. It is found that 20 kHz ultrasound accelerates hydrogen production from olivine suspensions in seawater under near-ambient conditions by almost 3000 times compared to the hydrothermal process. Strong mechanical stirring does not lead to hydrogen evolution in the temperature range of 40-90 °C. The striking effect of ultrasound is attributed to acoustic cavitation, which provides depassivation of the olivine surface, fragmentation of olivine particles, and local transient heating caused by collapsing bubbles. In principle, ultrasonic activation of the olivine/seawater system enables on-demand hydrogen production.
绿色氢能是实现全球脱碳和减少温室气体排放的支柱。在此，报道了一种受自然启发的新型绿色制氢工艺，该工艺使用几乎无限的自然资源。橄榄石是地球上地幔中最丰富的矿物，是此工艺的关键。研究发现，与水热法相比，20kHz的超声波在近环境条件下能使海水中橄榄石悬浮液的产氢速度加快近3000倍。在40-90°C的温度范围内，强力机械搅拌不会产生氢气。超声波的显著效果归因于声空化，它能使橄榄石表面去钝化、使橄榄石颗粒破碎，并使气泡坍塌引起局部瞬态加热。原则上，橄榄石/海水系统的超声活化能够按需制氢。
