Kinetic-enhanced carbon fiber for rechargeable zinc-air batteries
Kinetic-enhanced carbon fiber for rechargeable zinc-air batteries
复制标题
用于可充电锌空气电池的动能增强碳纤维
DOI：
10.1063/5.0135513
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Cheng Tang
中科院分区：
文献类型：
--
作者：
Yang Li;Bin Wang;Hao-Fan Wang;Cheng Tang
无金属催化剂是由自然界中储量无限的元素制成的，因此在包括金属-空气电池在内的能源设备中显示出大规模应用的潜力。金属-空气电池的构造更倾向于使用活性好、动力学快的自负载型催化剂。然而，由于无金属催化剂在析氧反应中形成O-─-O键的正电性有限，放氧反应与氧还原反应之间的比例关系受限，以及整体式电极表面难以形成孔洞，这是具有挑战性的。在这一贡献中，通过发展一种简便的在液氮中淬火高温碳布的方法，很好地构建了具有双功能活性石墨烯皮肤和快速动力学的自支撑碳布作为金属-空气电池的空气正极。碳纤维表面具有可调节的氧物种和三维分层孔隙率，具有较高的本征活性和显著的动力学增强，这使得它在水溶液中以及灵活的可充电锌空气电池中具有良好的性能。这项工作为快速动力学整体电极的合理设计和智能合成提供了一种有前景的策略，刷新了先进材料制造的概念和策略，也架起了材料科学和实用能源器件的桥梁。
Metal-free catalysts are made by the elements with infinite reserve in the nature, and therefore showing the potential for large-scale applications in energy devices including metal-air batteries. The construction of metal-air batteries prefer using self-supporting catalysts with favorable activity as well as fast kinetics. However, it is challengeable due to the limited electropositivity of metal-free catalysts for O─O bond formation in oxygen evolution reaction (OER), scaling relationship restrictions between OER and oxygen reduction reaction (ORR), and difficulty in porosity construction on the monolith electrode surface. In this contribution, through developing a facile methodology of quenching high-temperature carbon cloth in liquid nitrogen, a self-supported carbon cloth with bifunctional active graphene skin and fast kinetics is well constructed to serve as the air cathode in metal-air batteries. Regulated oxygen species and three-dimensionally hierarchical porosity are well constructed on the carbon fiber surfaces, contributing high intrinsic activity and prominently enhanced kinetics, which leads to favorable performances in aqueous as well as flexible rechargeable zinc-air batteries. The work proposed a promising strategy in the rational design and smart synthesis of fast-kinetic monolith electrodes, which refreshes concepts and strategies of advanced material fabrication, and also bridges material science and practical energy devices.