Yi Xing, Yuqian Fan, Junjun Wang, Miao Wang, Qianyu Xuan, Zhipeng Ma, Wenfeng Guo, Liqiang Mai
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引用次数: 0
Abstract
Rechargeable aqueous batteries adopting Fe-based materials are attracting widespread attention by virtue of high-safety and low-cost. However, the present Fe-based anodes suffer from low electronic/ionic conductivity and unsatisfactory comprehensive performance, which greatly restrict their practicability. Concerning the principle of physical chemistry, fabricating electrodes that could simultaneously achieve ideal thermodynamics and fast kinetics is a promising issue. Herein, hierarchical Fe3O4@Fe foam electrode with enhanced interface/grain boundary engineering is fabricated through an in situ self-regulated strategy. The electrode achieves ultrahigh areal capacity of 31.45 mA h cm-2 (50 mA cm-2), good scale application potential (742.54 mA h for 25 cm2 electrode), satisfied antifluctuation capability, and excellent cycling stability. In/ex situ characterizations further validate the desired thermodynamic and kinetic properties of the electrode endowed with accurate interface regulation, which accounts for salient electrochemical reversibility in a two-stage phase transition and slight energy loss. This work offers a suitable strategy in designing high-performance Fe-based electrodes with comprehensive inherent characteristics for high-safety large-scale energy storage.
采用铁基材料的可充电水电池因其安全性高、成本低而受到广泛关注。然而,目前的铁基阳极存在电子/离子电导率低、综合性能不理想等问题,极大地限制了其实用性。根据物理化学原理,制备可同时实现理想热力学和快速动力学的电极是一个很有前景的问题。本文通过原位自调控策略,制备了具有增强界面/晶粒边界工程的分层 Fe3O4@Fe 泡沫电极。该电极实现了 31.45 mA h cm-2 (50 mA cm-2)的超高面积容量、良好的规模应用电位(25 cm2 电极为 742.54 mA h)、满意的抗波动能力和出色的循环稳定性。原位/非原位表征进一步验证了该电极所需的热力学和动力学特性,并赋予其精确的界面调节,从而在两级相变和轻微能量损失中实现了显著的电化学可逆性。这项工作为设计具有全面固有特性的高性能铁基电极提供了合适的策略,可用于高安全性的大规模能量存储。
期刊介绍:
ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.