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Porous perovskite LaNiO3 nanocubes as cathode catalysts for Li-O2 batteries with low charge potential.

Zhang J, Zhao Y, Zhao X, Liu Z, Chen W - Sci Rep (2014)

Bottom Line: The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V).Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery.Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.

ABSTRACT
Developing efficient catalyst for oxygen evolution reaction (OER) is essential for rechargeable Li-O2 battery. In our present work, porous LaNiO3 nanocubes were employed as electrocatalyst in Li-O2 battery cell. The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V). The synergistic effect of porous structure, large specific surface area and high electrocatalytic activity of porous LaNiO3 nanocubes ensured the Li-O2 battery with enchanced capacity and good cycle stability. Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery. Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

No MeSH data available.


Related in: MedlinePlus

(a) XRD pattern of the nanocube-like precursors before(black) and after (blue) annealing; (b)Nitrogen adsorption-desorption isotherms and pore size distribution (inset) of porous LaNiO3 nanocubes catalyst.
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f2: (a) XRD pattern of the nanocube-like precursors before(black) and after (blue) annealing; (b)Nitrogen adsorption-desorption isotherms and pore size distribution (inset) of porous LaNiO3 nanocubes catalyst.

Mentions: The nanocube-like precursors were synthesized via a modified hydrothermal process33, with the pH value of 7.7 and the glycine to metal salt molar ratio of 3:1. Fig. 1a and 1c show the scanning electron microscopy (SEM) and transmission electron microscope (TEM) images of the as-prepared nanocube-like precursors. These precursors had smooth surfaces with the size about 250 nm. After annealing in O2 at 650°C for 2 h, the surface of the annealed products became rough and rich porosity was created (Fig. 1b and 1d). At the same time, the original cubic shape was not significantly changed. As displayed in the high-resolution TEM image in Fig. 1e, the distance of the adjacent fringes was 0.271 nm, corresponding to the lattice spacing of the (110) plane of perovskite-type LaNiO3. The X-ray diffraction (XRD) pattern (Fig. 2a) revealed that the annealed products were perovskite-type LaNiO3 (PDF#34-1028) without any La2O3 or NiO related phase. This indicates that the nanocube-like precursors had completely transformed into LaNiO3 after the 650°C annealing. The BET specific surface area of the annealed products was 35.8 m2 g−1 (Fig. 2b). It was nearly 10 times as high as that of the LaNiO3 particles prepared without glycine (Fig. S1). The average pore diameter of the porous LaNiO3 nanocubes was ~30 nm (Inset in Fig. 2b). However, without glycine, the nanocubic structure and rich porosity could not be obtained (Fig. S1, S2). Herein, glycine not only acted as a pore-forming agent but also a shape-control agent in the formation of porous nanocubic structure3435.


Porous perovskite LaNiO3 nanocubes as cathode catalysts for Li-O2 batteries with low charge potential.

Zhang J, Zhao Y, Zhao X, Liu Z, Chen W - Sci Rep (2014)

(a) XRD pattern of the nanocube-like precursors before(black) and after (blue) annealing; (b)Nitrogen adsorption-desorption isotherms and pore size distribution (inset) of porous LaNiO3 nanocubes catalyst.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4125986&req=5

f2: (a) XRD pattern of the nanocube-like precursors before(black) and after (blue) annealing; (b)Nitrogen adsorption-desorption isotherms and pore size distribution (inset) of porous LaNiO3 nanocubes catalyst.
Mentions: The nanocube-like precursors were synthesized via a modified hydrothermal process33, with the pH value of 7.7 and the glycine to metal salt molar ratio of 3:1. Fig. 1a and 1c show the scanning electron microscopy (SEM) and transmission electron microscope (TEM) images of the as-prepared nanocube-like precursors. These precursors had smooth surfaces with the size about 250 nm. After annealing in O2 at 650°C for 2 h, the surface of the annealed products became rough and rich porosity was created (Fig. 1b and 1d). At the same time, the original cubic shape was not significantly changed. As displayed in the high-resolution TEM image in Fig. 1e, the distance of the adjacent fringes was 0.271 nm, corresponding to the lattice spacing of the (110) plane of perovskite-type LaNiO3. The X-ray diffraction (XRD) pattern (Fig. 2a) revealed that the annealed products were perovskite-type LaNiO3 (PDF#34-1028) without any La2O3 or NiO related phase. This indicates that the nanocube-like precursors had completely transformed into LaNiO3 after the 650°C annealing. The BET specific surface area of the annealed products was 35.8 m2 g−1 (Fig. 2b). It was nearly 10 times as high as that of the LaNiO3 particles prepared without glycine (Fig. S1). The average pore diameter of the porous LaNiO3 nanocubes was ~30 nm (Inset in Fig. 2b). However, without glycine, the nanocubic structure and rich porosity could not be obtained (Fig. S1, S2). Herein, glycine not only acted as a pore-forming agent but also a shape-control agent in the formation of porous nanocubic structure3435.

Bottom Line: The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V).Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery.Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.

ABSTRACT
Developing efficient catalyst for oxygen evolution reaction (OER) is essential for rechargeable Li-O2 battery. In our present work, porous LaNiO3 nanocubes were employed as electrocatalyst in Li-O2 battery cell. The as-prepared battery showed excellent charging performance with significantly reduced overpotential (3.40 V). The synergistic effect of porous structure, large specific surface area and high electrocatalytic activity of porous LaNiO3 nanocubes ensured the Li-O2 battery with enchanced capacity and good cycle stability. Furthermore, it was found that the lithium anode corrosion and cathode passivation were responsible for the capacity fading of Li-O2 battery. Our results indicated that porous LaNiO3 nanocubes represent a promising cathode catalyst for Li-O2 battery.

No MeSH data available.


Related in: MedlinePlus