Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 1, Pages 923-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b02183
Keywords
Mg doped LaNiO3 nanofibers; electrospinning; bifunctional catalyst; density functional theory calculation; zinc-air batteries
Funding
- National Key RAMP
- D Project from Ministry of Science and Technology, China [2016YFA0202702]
- National Science Foundation of China [51372271, 51672029, 51602025, 51474009]
- Beijing Municipal Science AMP
- Technology Commission [Z171100000317001]
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Rational design of efficient and durable bifunctional catalysts toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is important for rechargeable zinc-air batteries. Herein, Mg doped perovskite LaNiO3 (LNO) nanofibers (LNMO NFs) were prepared by a facile electrospinning method combined with subsequent calcination. LNMO NFs show a more positive half-wave potential of 0.69 V and a lower overpotential of 0.45 V at a current density of 10 mA cm(-2) than those of the pristine LNO NFs. As an air electrode for zinc-air battery, the cell with LaNi0.85Mg0.15O3 NFs catalyst is able to deliver a high specific capacity of 809.9 mAh g(-1) at a current density of 5 mA cm(-2). It also shows an excellent cycling stability over 110 h at a current density of 10 mA cm(-2). DFT calculation results demonstrate that the LNMO surface binds oxygen stronger than LNO, which contributes to enhanced OER activity as observed in our experiments. The results indicate that LNMO NFs are an efficient and durable bifunctional catalyst for zinc-air batteries.
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