期刊
JOURNAL OF POWER SOURCES
卷 441, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227177
关键词
Co3Fe7 alloy; Carbon nanotubes; Oxygen electrocatalysts; Zinc-air batteries; Energy conversion
资金
- Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology [201805056ZD7CG40]
- National Natural Science Foundation of China [21405119]
- Natural Science Basic Research Plan in Shaanxi Province of China [2015JQ2046]
- China Postdoctoral Science Foundation [2014M562392]
- Fundamental Research Funds for the Central Universities [08143099]
Rational design and development of non-precious metal-based electrocatalysts for bifunctional oxygen reduction/evolution reactions (ORR/OER) are essential to realize the dischargeable Zinc-air batteries (ZABs). Herein, for the first time we synthesize CoFe-alloy nanoparticles enveloped by N, P co-doped carbon nanotubes (NPMC/CoFe), through a simple route by pyrolyzing dicyandiamide complex in the presence of phytic acid. The obtained electrocatalysts possess excellent ORR (a half wave potential of 0.896 V in 0.1 M KOH) and OER (eta(10) mA cm(-2) = 310 mV in 1 M KOH) performance, respectively. The liquid-state ZABs based on the NPMC/CoFe air-cathode demonstrates a high peak power density of 146.34 mW cm(-2) and excellent durability. Specifically, flexible and button-like ZABs with impressive performances are both realized, which could power light-emitting diodes. This work offers an attractive approach to develop the nonprecious metal-based ORR/OER catalysts, and modulators for the design of performance oriented electrocatalysts for wider electrochemical energy applications.
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