材料科学
双功能
催化作用
析氧
杂原子
氮化碳
氮化物
电解质
兴奋剂
碳纤维
化学工程
吡啶
无机化学
纳米技术
电极
电化学
化学
有机化学
复合数
光电子学
复合材料
物理化学
工程类
图层(电子)
戒指(化学)
光催化
作者
Hao Lei,Mangwei Cui,Yan Huang
标识
DOI:10.1021/acsami.2c09019
摘要
The efficient operation of Zn-air batteries (ZABs) requires highly active and stable reversible air catalysts. Studies have shown that heteroatom-doped carbonaceous nanomaterials are effective metal-free electrocatalysts for the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). Herein, we design a facile and scalable catalyst doping scheme to manufacture S-doped carbon nitride (S-C3N4). Surprisingly, this metal-free catalyst exhibits excellent OER and ORR electrocatalytic activities in alkaline electrolytes, being comparable to those of commercial Pt/C. For the first time, it is proved by experiments that S doping can not only effectively increase the lattice defects of C3N4 but also promote the conversion of pyrrolic nitrogen to pyridine nitrogen, thereby enhancing the bifunctional catalytic activity (OER and ORR). When the catalyst is used as an air electrode for rechargeable ZABs, its performance is obviously better than that provided by commercial Pt/C. Our findings and material design strategies are expected to provide new ideas for the synthesis of various high-performance carbon-based electrocatalysts.
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