期刊
ENERGY STORAGE MATERIALS
卷 27, 期 -, 页码 514-521出版社
ELSEVIER
DOI: 10.1016/j.ensm.2019.12.013
关键词
Metal-free; Active nitrogen; Bifunctional oxygen electrocatalyst; Zinc-air batteries
资金
- National Natural Science Foundation of China, China [51702180, 51572136, 51772162]
- Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology
- Scientific and Technical Development Project of Qingdao, China [18-2-2-52jch]
The availability of efficient, low-cost and durable oxygen electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is the prerequisites for large-scale,practical application of rechargeable zinc (Zn)-air batteries. Thus, stable electrocatalysts with high oxygen electrocatalytic activity are in highly demand. Low-cost and metal-free carbon-based bifunctional oxygen electrocatalysts are regarded as promising alternatives to the commercially used noble metals which suffer from multiple drawbacks, including poor stability, high cost and susceptibility to methanol. Here, a facile and scalable strategy was introduced to fabricate porous carbon matrix doped with high content of active nitrogen species as efficient bifunctional oxygen electrocatalyst for superior Zn-air battery. Notably, the obtained electrocatalysts exhibit an ultrahigh surface area of 1200.3 m(2) g(-1) and abundant defects, both of which are capable to facilitate the accessibility and formation of catalytic sites. The as-fabricated Zn-air batteries achieve significantly large peak power density of similar to 160 mW cm(-3) and excellent cycling performance (nearly 1000 cycles) with small voltage gap of 0.97 V. This research opens novel avenue for the design and fabrication of affordable high-performance oxygen electrocatalyst and durable energy storage systems.
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