Matter ( IF 17.3 ) Pub Date : 2020-03-17 , DOI: 10.1016/j.matt.2020.02.020 Yi Xing , Kai Wang , Na Li , Dong Su , Wing-Tak Wong , Bolong Huang , Shaojun Guo
The aprotic Li-CO2 battery with high energy density is an attractive energy-storage technology. However, its development is largely impeded by the sluggish kinetics of CO2 reduction and evolution reactions. Here, we demonstrate a class of ultrathin triangular RuRh alloy nanosheets as an exceptionally active catalyst for greatly accelerating the kinetics of CO2 reduction and evolution reactions and achieving a high-performance Li-CO2 battery. The RuRh alloy nanosheets-based battery can achieve the lowest voltage gap of 1.35 V during the charge-discharge process and stably cycle for 180 cycles with a cutoff capacity of 1,000 mAh g−1 at 1,000 mA g−1. Density functional theory calculations demonstrate the pivotal roles of Rh introduction in RuRh alloy nanosheets, which evidently activate the electron-transfer ability of surface Ru and balance the CO2 binding near Ru sites. We find that the d-d correlation between Rh and Ru contributes to the energetically favorable cycle of the Li-CO2 battery.
中文翻译:
超薄RuRh合金纳米片可实现高性能锂CO 2电池
具有高能量密度的非质子Li-CO 2电池是一种有吸引力的能量存储技术。然而,CO 2还原和析出反应的缓慢动力学极大地阻碍了其发展。在这里,我们展示了一类超薄三角形RuRh合金纳米片,作为一种极活泼的催化剂,可极大地加速CO 2还原和析出反应的动力学并实现高性能的Li-CO 2电池。RuRh合金纳米片基电池可在充电和放电过程中实现1.35 V的最低电压间隙,并在1,000 mA g -1时的截止容量为1,000 mAh g -1的情况下稳定循环180个循环。密度泛函理论计算证明了Rh引入RuRh合金纳米片中的关键作用,这显然激活了表面Ru的电子转移能力并平衡了Ru部位附近的CO 2结合。我们发现,Rh和Ru之间的dd相关性有助于Li-CO 2电池在能量上有利的循环。