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yexuqing木虫之王 (文学泰斗)
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通过弛豫时间调制实现人工异质结构的高能量密度
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通过弛豫时间调制实现人工异质结构的高能量密度 ▲ 作者：SANGMOON HAN, JUSTIN S. KIM, EUGENE PARK, YUAN MENG, ZHIHAO XU, ALEXANDRE C. FOUCHER, ET AL. ▲ 链接： https://www.science.org/doi/10.1126/science.adl2835 ▲ 摘要： 静电电容器因其超快的充放电能力成为先进电子器件和大功率电气系统的基础元件。铁电材料具有较高的最大极化，但高残余极化阻碍了其在储能应用中的有效部署。先前方法由于铁电材料结晶度退化而遭遇瓶颈。 研究组介绍了一种利用二维（2D）材料控制弛豫时间的方法，同时通过使用2D/3D/2D异质结构来最小化能量损失，并保持铁电3D材料的结晶度。使用该方法可实现191.7 J/cm3的能量密度，效率超过90%。 这种对弛豫时间的精确控制有望促进广泛应用，并有潜力加速高效储能系统的发展。 ▲ Abstract： Electrostatic capacitors are foundational components of advanced electronics and high-power electrical systems owing to their ultrafast charging-discharging capability. Ferroelectric materials offer high maximum polarization, but high remnant polarization has hindered their effective deployment in energy storage applications. Previous methodologies have encountered problems because of the deteriorated crystallinity of the ferroelectric materials. We introduce an approach to control the relaxation time using two-dimensional (2D) materials while minimizing energy loss by using 2D/3D/2D heterostructures and preserving the crystallinity of ferroelectric 3D materials. Using this approach, we were able to achieve an energy density of 191.7 joules per cubic centimeter with an efficiency greater than 90%. This precise control over relaxation time holds promise for a wide array of applications and has the potential to accelerate the development of highly efficient energy storage systems. |
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