Design of 3-Dimensional Hierarchical Architectures of Carbon and Highly Active Transition Metals (Fe, Co, Ni) as Bifunctional Oxygen Catalysts for Hybrid Lithium - Air Batteries
Design of 3-Dimensional Hierarchical Architectures of Carbon and Highly Active Transition Metals (Fe, Co, Ni) as Bifunctional Oxygen Catalysts for Hybrid Lithium - Air Batteries
复制标题
碳和高活性过渡金属（Fe、Co、Ni）的三维分层结构设计作为混合锂-空气电池的双功能氧催化剂
DOI：
10.1021/acs.chemmater.6b05056
复制
发表时间：
2017-02-28
影响因子：
8.6
通讯作者：
Ramakrishna, Seeram
中科院分区：
文献类型：
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作者：
Ji, Dongxiao;Peng, Shengjie;Ramakrishna, Seeram
灵活的电源和高能量密度的高效储能设备是未来可持续发展社区的迫切需求。从理论上讲，可充电金属空气电池是下一代电源的有希望的候选者。合理设计高催化活性的氧还原反应（ORR）和析氧反应（OER）催化剂是开发高效耐用金属空气电池的关键。在此，我们提出了一种新的策略，通过简单的自由表面静电纺丝技术和原位生长碳化技术，在碳纳米纤维薄膜（MNO-CNT-CNFFs, M = Fe, Co, Ni）上大量合成非贵重过渡金属基氮/氧共掺杂碳纳米管（CNTs）。结合铁催化的高催化活性和3D碳纤维膜的高效质量传递特性，由此制备的柔性且坚固的fno - cnt - cnff在ORR的正半波电位（0.87 V）和OER的低过电位（430 mV @ 10 mA cm(-2)）方面表现出最高的双功能氧催化活性。作为概念验证，新设计的以fno - cnt - cnff为空气电极制造的混合锂-空气电池在实际的露天测试中表现出高电压（约3.4 V）、低过电位（0.15 V）和长循环寿命（超过120 h），证明了独立催化剂的优越性及其在燃料电池和柔性储能设备中的应用前景。
Flexible power sources and efficient energy storage devices with high energy density are highly desired to power a future sustainable community. Theoretically, rechargeable metal air batteries are promising candidates for the next-generation power sources. The rational design of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts with high catalytic activity is critical to the development of efficient and durable metal air batteries. Herein, we propose a novel strategy to mass synthesize nonprecious transition-metal-based nitrogen/oxygen codoped carbon nanotubes (CNTs) grown on carbon-nanofiber films (MNO-CNT-CNFFs, M = Fe, Co, Ni) via a facile free-surface electrospinning technique followed by in situ growth carbonization. With a combination of the high catalytic activity of Fe-catalyzed CNTs and the efficient mass-transport characteristics of 3D carbon fiber films, the resultant flexible and robust FeNO-CNT-CNFFs exhibit the highest bifunctional oxygen catalytic activities in terms of a positive half-wave potential (0.87 V) for ORR and low overpotential (430 mV @ 10 mA cm(-2)) for OER. As proof-of-concept, newly designed hybrid Li-air batteries fabricated with FeNO-CNT-CNFFs as air electrode present high voltage (similar to 3.4 V), low overpotential (0.15 V), and long cycle life (over 120 h) in practical open-air tests, demonstrating the superiority of the freestanding catalysts and their promising potential for the applications in fuel cells and flexible energy storage devices.