利用Mn3O4纳米片调控多孔氮化镓晶体的活性位点用于先进的高温储能

IF 13 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Songyang Lv, Shouzhi Wang, Qirui Zhang, Lin Xu, Ge Tian, Jiaoxian Yu, Guodong Wang, Lili Li, Xiangang Xu, Lei Zhang
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引用次数: 0

摘要

氮化镓单晶具有优异的电子迁移率和耐热性,在高温综合电力系统中具有很大的应用潜力。然而,电荷存储动力学迟缓和能量密度不足是制约其实际应用的瓶颈。在此基础上,开发了一种具有高温环境下能量收集和存储功能的自支撑型GaN/Mn3O4集成电极。实验和理论计算结果表明,这种具有Mn-N异质界面的集成结构带来了丰富的活性位点,重构了高效电荷转移的低能势垒通道,合理优化了离子吸附能力,增强了结构的稳定性。因此,组装的GaN基超级电容器在130°C下循环10,000次后,功率密度为34.0 mW cm−2,电容保持率为81.3%。该工作创新性地将厘米尺度GaN单晶与理想理论容量Mn3O4联系起来,为后续宽带隙半导体储能应用提供了有效途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Regulation Active Sites of Porous GaN Crystal Via Mn3O4 Nanosheets for Advanced High Temperature Energy Storage

Regulation Active Sites of Porous GaN Crystal Via Mn3O4 Nanosheets for Advanced High Temperature Energy Storage

Gallium nitride (GaN) single crystal with prominent electron mobility and heat resistance have great potential in the high temperature integrate electric power systems. However, the sluggish charge storage kinetics and inadequate energy densities are bottlenecks to its practical application. Herein, the self-supported GaN/Mn3O4 integrated electrode is developed for both energy harvesting and storage under the high temperature environment. The experimental and theoretical calculations results reveal that such integrated structures with Mn-N heterointerface bring abundant active sites and reconstruct low-energy barrier channels for efficient charge transferring, reasonably optimizing the ions adsorption ability and strengthening the structural stability. Consequently, the assembled GaN based supercapacitors deliver the power density of 34.0 mW cm−2 with capacitance retention of 81.3% after 10 000 cycles at 130 °C. This work innovatively correlates the centimeter scale GaN single crystal with ideal theoretical capacity Mn3O4 and provides an effective avenue for the follow-up energy storage applications of the wide bandgap semiconductor.

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来源期刊
Energy & Environmental Materials
Energy & Environmental Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
17.60
自引率
6.00%
发文量
66
期刊介绍: Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.
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