Ock Il Woo, Zhao Xun, Tat Trinny, Xu Jing, Chen Jun
Department of Bioengineering, University of California, Los Angeles, Los Angeles, California90095, United States.
ACS Nano. 2022 Oct 25;16(10):16816-16823. doi: 10.1021/acsnano.2c06540. Epub 2022 Oct 6.
Energy consumption and the resulting climate change are the two major challenges to human sustainability. Hydrogen (H) is a form of environmentally friendly renewable energy with an extremely high energy density of 143 MJ kg. Water splitting is a practical and cost-effective approach to generate H through the decomposition of HO by electrolysis with an external power supply. Herein, we introduce a compelling platform technology for self-powered water splitting by using a soft magnetoelastic generator to convert hydropower into electricity as a sustainable power supply for electrolysis. At a rotating speed of 469 rpm, the hydropower harvester is able to convert flowing kinetic energy into electricity and produce a high current density of 2.99 mA cm at a low resistance of 60 Ω. The magnetoelastic generator is intrinsically waterproof since the magnetic field can penetrate the water molecules. As a demonstration, the device maintained a stable electrical output even in underwater situations after over 7,000 cyclic operations. The generated electricity from hydropower could produce H at a rate of 1.93 × 10 mL min. In conclusion, this work provides a compelling method for self-powered water splitting by using flowing kinetic energy.
能源消耗以及由此引发的气候变化是人类可持续发展面临的两大挑战。氢（H）是一种环境友好型可再生能源，其能量密度极高，达143兆焦/千克。水分解是一种实用且经济高效的制氢方法，即通过外部电源电解分解水（H₂O）来产生氢气。在此，我们介绍一种引人注目的平台技术，该技术利用软磁弹性发电机将水能转化为电能，作为电解的可持续电源，实现自供电水分解。在469转/分钟的转速下，水能收集器能够将流动的动能转化为电能，并在60Ω的低电阻下产生2.99毫安/平方厘米的高电流密度。磁弹性发电机本质上是防水的，因为磁场可以穿透水分子。作为一个实例，该装置在超过7000次循环操作后，即使在水下环境中也能保持稳定的电输出。水能产生的电能可以以1.93×10毫升/分钟的速率产生氢气。总之，这项工作提供了一种利用流动动能进行自供电水分解的引人注目的方法。
