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Biomass-derived highly dispersed Co/Co9S8 nanoparticles encapsulated in S, N-co-doped hierarchically porous carbon as an efficient catalyst for hybrid Na–CO2 batteries
Materials Today Energy ( IF 9.0 ) Pub Date : 2020-11-21 , DOI: 10.1016/j.mtener.2020.100594
C. Xu , J. Zhan , Z. Wang , X. Fang , J. Chen , F. Liang , H. Zhao , Y. Lei

Na–CO2 batteries are prospective in energy storage and CO2 recycling applications; development of a high-efficiency, low-cost electrocatalyst to promote CO2 reduction and carbonate decomposition is extremely vital for practical Na–CO2 batteries. Herein, a highly efficient cathode catalyst for rechargeable hybrid Na–CO2 batteries is successfully synthesized by encapsulating highly dispersed Co/Co9S8 nanoparticles into carbon skeletons, consisting of biomass-derived S, N-co-doped hierarchically porous carbon (Co/Co9S8@SNHC). The conductive and hierarchically porous framework structure of the Co/Co9S8@SNHC can not only accelerate electron transport, electrolyte infiltration, and CO2 diffusion but also can inhibit overgrowth and agglomeration of Co/Co9S8 nanoparticles and expose numerous high density of active sites, as well as offer sufficient space to store discharge products. Benefiting from the synergistic effect among S and N dopants, carbon defects, and Co/Co9S8 nanoparticles in robust porous carbon structure, the hybrid Na–CO2 batteries displayed a low charge overpotential (only ~0.32 V) at 0.2 mA/cm2 and repeatedly charged and discharged over 200 cycles at 0.1 mA/cm2. Besides, an ultrahigh areal capacity of ~18.9 mAh/cm2 was obtained at 0.5 mA/cm2, the highest value to date for Na–CO2 batteries. Meanwhile, the hybrid Na–CO2 battery charging from Na2CO3@C catalytic cathode demonstrated the high catalytic activity of biomass-derived S,N-co-doped hierarchically porous carbon (Co/Co9S8@SNHC) for CO2 reduction and carbonate decomposition. Given this finding, this work might open up a potential avenue for the reasonable design of low-cost and highly efficient catalysts for advanced metal-CO2 batteries systems.



中文翻译:

生物质衍生的高度分散的Co / Co 9 S 8纳米颗粒,包裹在S,N-co掺杂的分级多孔碳中,作为混合Na–CO 2电池的有效催化剂

Na–CO 2电池在能量存储和CO 2回收应用中具有前景。开发高效,低成本的电催化剂以促进CO 2还原和碳酸盐分解对于实用的Na–CO 2电池至关重要。本文中,通过将高度分散的Co / Co 9 S 8纳米颗粒封装到碳骨架中成功地合成了可再充电混合Na-CO 2电池的高效阴极催化剂,碳骨架由生物质衍生的S,N-co掺杂的分级多孔碳(Co / Co 9 S 8 @SNHC)。Co / Co的导电且分层多孔的骨架结构9 S 8 @SNHC不仅可以加速电子传输,电解质渗透和CO 2扩散,而且可以抑制Co / Co 9 S 8纳米粒子的过度生长和聚集,并暴露出大量的高活性位点,并提供足够的空间存放放电产品。得益于强大的多孔碳结构中S和N掺杂剂,碳缺陷和Co / Co 9 S 8纳米粒子之间的协同效应,Na-CO 2混合电池在0.2 mA / cm 2 并以0.1 mA / cm 2重复充电和放电200次。此外, 在0.5 mA / cm 2下获得了约18.9 mAh / cm 2的超高面积容量,这是迄今为止Na-CO 2电池的最高容量。同时,由Na 2 CO 3 @C催化阴极充电的Na-CO 2混合电池表现出生物质衍生的S,N-co掺杂的分级多孔碳(Co / Co 9 S 8 @SNHC)对CO的高催化活性。2还原和碳酸盐分解。鉴于这一发现,这项工作可能为合理设计用于先进金属-CO 2电池系统的低成本和高效催化剂开辟一条潜在途径。

更新日期:2020-12-23
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