Zhang Yan, Khanbareh Hamideh, Dunn Steve, Bowen Chris R, Gong Hanyu, Duy Nguyen Phuc Hoang, Phuong Pham Thi Thuy
State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.
Department of Mechanical Engineering, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
Adv Sci (Weinh). 2022 Mar;9(9):e2105248. doi: 10.1002/advs.202105248. Epub 2022 Jan 27.
To date, a number of studies have reported the use of vibrations coupled to ferroelectric materials for water splitting. However, producing a stable particle suspension for high efficiency and long-term stability remains a challenge. Here, the first report of the production of a nanofluidic BaTiO suspension containing a mixture of cubic and tetragonal phases that splits water under ultrasound is provided. The BaTiO particle size reduces from approximately 400 nm to approximately 150 nm during the application of ultrasound and the fine-scale nature of the particulates leads to the formation of a stable nanofluid consisting of BaTiO particles suspended as a nanofluid. Long-term testing demonstrates repeatable H evolution over 4 days with a continuous 24 h period of stable catalysis. A maximum rate of H evolution is found to be 270 mmol h g for a loading of 5 mg l of BaTiO in 10% MeOH/H O. This work indicates the potential of harnessing vibrations for water splitting in functional materials and is the first demonstration of exploiting a ferroelectric nanofluid for stable water splitting, which leads to the highest efficiency of piezoelectrically driven water splitting reported to date.
迄今为止，已有多项研究报道了利用与铁电材料耦合的振动来进行水分解。然而，制备用于高效和长期稳定性的稳定颗粒悬浮液仍然是一项挑战。在此，首次报道了一种含有立方相和四方相混合物的纳米流体BaTiO悬浮液的制备，该悬浮液在超声作用下可分解水。在施加超声过程中，BaTiO颗粒尺寸从约400nm减小至约150nm，颗粒的精细尺度性质导致形成了由悬浮的BaTiO颗粒组成的稳定纳米流体。长期测试表明，在连续24小时的稳定催化过程中，4天内可实现可重复的氢气析出。对于在10%甲醇/水中5mg/L的BaTiO负载量，发现最大氢气析出速率为270mmol h g。这项工作表明了利用振动在功能材料中进行水分解的潜力，并且是首次证明利用铁电纳米流体实现稳定水分解，这导致了迄今为止报道的压电驱动水分解的最高效率。
