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| 1 | 超低浓度电解液助力K0.486V2O5高性能质子存储显示文摘高浓度电解液被认为是一种很有前景的拓宽电解液电化学稳定窗口和提高水系电池电化学性能的方法.但是高浓度电解液也存在高成本、高粘度、低电导率等棘手问题.因为特殊的Grotthuss机制,质子电池能够在低浓度电解液中获得足够的动力学性能.基于此,我们采用罕见的超低浓度硫酸电解液(0.01 mol L^(-1))助力K~+预嵌的VO(KVO,KVO)电化学稳定性.在50 mA g^(-1)的低电流密度下,KVO电极具有129 mA h g^(-1)的比容量;在1 A g^(-1)的电流密度下,循环20,000圈的容量保持率为78%.超低浓度电解液策略为开拓耐用的、低成本的水系能源存储系统提供了一种新的路径. | 董升阳 吕南 任睿祺 吴雨琳 刘品 朱国银 王文军 张一洲 董晓臣 | 2022 | Science China Materials2022，65，11： | 0 |
| 2 | Efficient oxygen electrocatalysts with highly-exposed Co-N4 active sites on N-doped graphene-like hierarchically porous carbon nanosheets enhancing the performance of rechargeable Zn-air batteries显示文摘Designing bifunctional oxygen electrocatalysts with high activity,lasting stability,and low-cost for rechargeable zinc-air batteries(RZABs)is a tough challenge.Herein,an advanced electrocatalyst is prepared by anchoring atomically dispersed Co atoms on Ndoped graphene-like hierarchically porous carbon nanosheets(SA-Co-N4-GCs)and thereby forming Co-N4-C architecture.Its unique structure with excellent conductivity,large surface area,and three dimensional(3D)interconnected hierarchically porous architecture exposes not only more Co-N4 active sites to accelerate the kinetics of both oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),but also provides an efficient charge/mass transport environment to reduce diffusion barrier.Consequently,SA-Co-N4-GCs exhibits excellent ORR/OER bifunctional activities and durability,surpassing noble-metal catalysts.Liquid RZABs using SA-Co-N4-GCs cathodes display a high open-circuit voltage of 1.51 V,a remarkable power density of 149.3 mW·cm−2,as well as excellent stability and rechargeability with faint increase in polarization even at a large depth of charge–discharge cycle with 16 h per cycle over an entire 600 h long-term test.Moreover,flexible quasi-solid-state RZABs with SA-Co-N4-GCs cathodes also deliver a considerable power density of 124.5 mW·cm−2,which is even higher than that of liquid batteries using noble-metal catalysts.This work has thrown new insight into development of high-performance and low-cost electrocatalysts for energy conversion and storage. | Nengfei Yu Hui Chen Jingbiao Kuang Kailin Bao Wei Yan Jilei Ye Zhongtang Yang Qinghong Huang Yuping Wu Shigang Sun | 2022 | Nano Research2022，15，8： | 0 |
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