化学
催化作用
硫黄
中心(范畴论)
还原(数学)
Atom(片上系统)
金属
无机化学
结晶学
有机化学
几何学
数学
计算机科学
嵌入式系统
作者
Guolei Cai,Haifeng Lv,Guikai Zhang,Danqing Liu,Jing Zhang,Jiawen Zhu,Jing Xu,Xianghua Kong,Song Jin,Xiaojun Wu,Hengxing Ji
摘要
Sulfur reduction reaction (SRR) facilitates up to 16 electrons, which endows lithium-sulfur (Li-S) batteries with a high energy density that is twice that of typical Li-ion batteries. However, its sluggish reaction kinetics render batteries with only a low capacity and cycling life, thus remaining the main challenge to practical Li-S batteries, which require efficient electrocatalysts of balanced atom utilization and site-specific requirements toward highly efficient SRR, calling for an in-depth understanding of the atomic structural sensitivity for the catalytic active sites. Herein, we manipulated the number of Fe atoms in iron assemblies, ranging from single Fe atom to diatomic and triatomic Fe atom groupings, all embedded within a carbon matrix. This led to the revelation of a "volcano peak" correlation between SRR catalytic activity and the count of Fe atoms at the active sites. Utilizing
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