Zhang Huihui, Lin Han, Lin Keng-Te, Su Dawei, Ma Tianyi, Jia Baohua
Centre for Atomaterials and Nanomanufacturing, RMIT University, Melbourne, VIC, 3000, Australia.
Technological and Higher Education Institute of Hong Kong, Hong Kong, China.
Small. 2024 Sep;20(39):e2304530. doi: 10.1002/smll.202304530. Epub 2024 Feb 28.
Elevating the working temperature delivers a simple and universal approach to enhance the energy storage performances of supercapacitors owing to the fundamental improvements in ion transportation kinetics. Among all heating methods, introducing green and sustainable photothermal heating on supercapacitors (SCs) is highly desired yet remains an open challenge, especially for developing an efficient and universal photothermal heating strategy that can be generally applied to arbitrary SC devices. Flash-enabled graphene (FG) absorbers are produced through a simple and facile flash reduction process, which can be coated on the surface of any SC devices to lift their working temperature via a photothermal effect, thus, improving their overall performance, including both power and energy densities. With the systematic temperature-dependent investigation and the in-depth numerical simulation of SC performances, an evident enhancement in capacitance up to 65% can be achieved in photothermally enhanced SC coin cell devices with FG photo-absorbers. This simple, practical, and universal enhancement strategy provides a novel insight into boosting SC performances without bringing complexity in electrode fabrication/optimization. Also, it sheds light on the highly efficient utilization of green and renewable photothermal energies for broad application scenarios, especially for energy storage devices.
提高工作温度提供了一种简单通用的方法来增强超级电容器的储能性能，这归因于离子传输动力学的根本改善。在所有加热方法中，在超级电容器（SCs）上引入绿色可持续的光热加热是非常可取的，但仍然是一个悬而未决的挑战，特别是对于开发一种可普遍应用于任意SC器件的高效通用光热加热策略而言。通过简单便捷的快速还原工艺制备了具有快速响应能力的石墨烯（FG）吸收体，其可涂覆在任何SC器件表面，通过光热效应提高其工作温度，从而改善其整体性能，包括功率密度和能量密度。通过对SC性能进行系统的温度依赖性研究和深入的数值模拟，在带有FG光吸收体的光热增强型SC纽扣电池器件中，电容可显著提高达65%。这种简单、实用且通用的增强策略为提升SC性能提供了新的思路，而不会给电极制造/优化带来复杂性。此外，它还为绿色可再生光热能在广泛应用场景中的高效利用提供了启示，特别是对于储能设备。
