An Efficient Oxygen Evolution Catalyst for Hybrid Lithium Air Batteries: Almond Stick Type Composite of Perovskite and Cobalt Oxide

Abstract

We investigated the electrochemical composite effect between cobalt oxide and Nd0.5Sr0.5CoO3-δ (Co-NSC). A double phase Co-NSC composite was successfully synthesized by a new synthesis process rather than a single phase Nd0.5Sr0.5Co1.1O3-δ perovskite. The composite has good catalytic activity, high number of transferred electrons (3.9) compatible with Pt/C, and low concentration of the peroxide species (HO−2) yields (<5%). Also, it shows the outperformed onset potential (0.576 V vs. Hg/HgO) of the oxygen evolution reaction (OER) at −2.0 mA cm−2, indicating higher current density than perovskite related catalysts such as Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF), La1.7Sr0.3NiO4 (LSN), LaNiO3 (LNO) and the state-of-the-art rutile IrO2. The good catalytic activity of Co-NSC is ascribed to the higher amount of Co3+ cations and higher Oad/Olattice ratio. Interestingly, the cyclic performance of the composite is also remarkably stable without observable degradation in a hybrid lithium air cell.

Synergistic Coupling Derived Cobalt Oxide with Nitrogenated Holey Two-Dimensional Matrix as an Efficient Bifunctional Catalyst for Metal–Air Batteries

“…20 This increased ratio of oxidation Co state is consistent with the specific interaction between Co 3 O 4 and C 2 N from the XPS spectrum of N 1s. Therefore, the higher ratio of Co 3+ /Co 2+ provides more donor−acceptor reduction sites, which is an important factor for the ORR and OER, and is expected to increase the catalytic activities of NP Co 3 O 4 / Fe@C 2 N. 4,40 The O 1s spectra show three main peaks representing lattice oxygen (O lattice ), adsorbed oxygen species (O ad ), and adsorbed H 2 O (H 2 O ad ), as shown in Figure 5f. Based on the fitted results, the relative contents (O lattice /O ad ) of NP Co 3 O 4 /Fe@C 2 N and composite Co 3 O 4 +Fe@C 2 N are 1.94 and 2.93, respectively.…”

Strategies toward High‐Performance Cathode Materials for Lithium–Oxygen Batteries

“…Perovskite oxides with a general formula of ABO 3 (A: alkaline‐ or rare‐earth cations, B: transition metal cations) have many attractive physical/chemical properties, such as rich composition chemistry, tunable catalytic activity, high electronic/ionic conductivity, and good electrochemical stability . As an important family of functional materials, perovskite oxides have also been employed as low‐cost and stable bifunctional cathode catalysts for Li–O 2 batteries . Perovskite Sr 0.95 Ce 0.05 CoO 3− δ particles with surface‐loaded copper nanoparticles have been prepared and used as a cathode catalyst for Li–O 2 batteries .…”

“…When employed as electrocatalysts in Li–O 2 batteries, these oxides show enhanced electrochemical performance. Recently, Gwon et al prepared a double‐phase cobalt oxide and Nd 0.5 Sr 0.5 CoO 3− δ (Co‐NSC) composite to investigate the composite effect on the electrochemical performance . The Co‐NSC composite shows higher catalytic activity for OER than single‐phase perovskite catalysts, such as Nd 1− x Sr x CoO 3− δ , La 1− x Sr x CoO 3− δ , and Ba x Sr 1− x Co y Fe 1− y O 3− δ .…”

“…Recently, Gwon et al prepared a double‐phase cobalt oxide and Nd 0.5 Sr 0.5 CoO 3− δ (Co‐NSC) composite to investigate the composite effect on the electrochemical performance . The Co‐NSC composite shows higher catalytic activity for OER than single‐phase perovskite catalysts, such as Nd 1− x Sr x CoO 3− δ , La 1− x Sr x CoO 3− δ , and Ba x Sr 1− x Co y Fe 1− y O 3− δ . The additional cobalt in Co‐NSC, resulted from the formation of cobalt oxide, increases the concentration of Co 3+ cations and adsorbed oxygen ratio, and consequently the catalytic active sites.…”

Advanced Electrochemical Properties of PrBa0.5Sr0.5Co1.9Ni0.1O5+δ as a Bifunctional Catalyst for Rechargeable Zinc‐Air Batteries

“…Therefore, the development of efficient electrocatalysts for these reactions is of immediate interest. A variety of materials including precious and non-precious metals, [12][13][14] their alloys, [15][16][17] and oxides, [18,19] carbon-based nanoparticles, [20,21] and composite materials [22][23][24] have been extensively studied as electrocatalysts due to their high catalytic activities towards ORR and OER reactions.…”