Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 274, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119091
Keywords
Atomic dispersion; Dual site; Oxygen electrocatalysis; Zinc-air battery
Funding
- National Natural Science Foundation of China (NSFC) [21701101]
- National Key Research and Development Project [2016YFF0204402]
- Fundamental Research Funds for the Central Universities [18CX06063A]
- Long-Term Subsidy Mechanism from the Ministry of Finance
- Ministry of Education of China
- Shandong Scientific Research Awards Foundation for Outstanding Young Scientists [ZR2018JL010]
- Program for the Qingdao scientifific and technological innovation high-level talents project-Aluminum-ion power and energy storage battery [17-2-1-1-zhc]
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Atomically dispersed metal-nitrogen-carbon complexes on carbon supports have drawn tremendous attention in the electrocatalysis fields. Herein, we managed the synthesis of atomically dispersed binary NixFe100-x-NC (x = 0-100) materials with tunable Ni/Fe ratios and investigated their underneath synergy effects for the enhancement of oxygen reduction (ORR) and oxygen evolution reactions (OER). EXAFS revealed the abundant presence of Ni(N-3)-Fe(N-3)-C-n moieties in Ni66Fe34-NC sample. XPS fine scans indicated deep synergy of dual-site Ni/Fe that favored more charge localized over Ni/Fe sites. Electrochemical measurments showed that the Ni66Fe34-NC delivered a very high ORR half-wave potential (E-1/2) of 0.85 V and a low OER overpotential of 467 mV at similar to 10 mA cm(-2) (Ej =10). The Fe site with Ni neighboring, as suggested by DFT simulations and in-situ Raman, was the responsible site for both ORR and OER. Furthermore, the Ni66Fe34-NC-assembled Zn-air battery afforded large specific power density and extraordinary cycling stability.
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