Kai Zhou, Min Zou, Jingwen Guo, Zhen Xu, Wei Hu, Yuzhou Zhu, Libin Liu, Ligang Gai
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引用次数: 0
摘要
除了表面化学和纹理特性之外,表面原子结构和结晶度对电极材料的电化学储能也有重要影响。我们在此首次报道了氮化镓这种著名的储能电极材料的表面原子结构和结晶度可以通过硝酸钾介导的合成控制退火时间来调整。理论计算揭示了氮化镓微晶具有增强的强度比和优异的速率性能的内在机理。氮化镓电极的储能机制和电极动力学也得到了澄清。此外,基于氮化镓微晶的对称超级电容器由 52 wt% HPO 赋能,在-60 和 60 °C 下工作时,电极材料的比功率为 392.2 W L,输出电压为 1.5 V,体积比能量分别为 11.6 和 40.2 W h L。
Tuning the active plane and crystallinity of GaN microcrystals for high-performance supercapacitors through potassium nitrate-mediated synthesis
The surface atomic structure and crystallinity have an important effect on the electrochemical energy storage of electrode materials, in addition to the surface chemistry and textural properties. We report here for the first time that the surface atomic structure and crystallinity of GaN, a renowned electrode material for energy storage, can be tuned by controlling the annealing time via potassium nitrate-mediated synthesis. The underlying mechanism for GaN microcrystals with enhanced intensity ratios of and manifesting excellent rate performance has been revealed by theoretical computations. The energy storage mechanism and electrode kinetics of the GaN electrodes have been clarified. In addition, the GaN microcrystals-based symmetric supercapacitors empowered by 52 wt% HPO can deliver an output voltage of 1.5 V and volumetric specific energy of 11.6 and 40.2 W h L at a specific power of 392.2 W L when operating at −60 and 60 °C, respectively, with electrode material on a commercial loading level.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems