High-Performance A-Site Deficient Perovskite Electrocatalyst for Rechargeable Zn–Air Battery

Abstract

Zinc–air batteries are one of the most excellent of the next generation energy devices. However, their application is greatly hampered by the slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) of air electrode. It is of great importance to develop good oxygen electrocatalysts with long durability as well as low cost. Here, A-site deficient (SmSr)0.95Co0.9Pt0.1O3 perovskites have been studied as potential OER electrocatalysts prepared by EDTA–citrate acid complexing method. OER electrocatalytic performance of (SmSr)0.95Co0.9Pt0.1O3 was also evaluated. (SmSr)0.95Co0.9Pt0.1O3 electrocatalysts exhibited good OER activities in 0.1 M KOH with onset potential and Tafel slope of 1.50 V and 87 mV dec−1, similar to that of Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF-5582). Assembled rechargeable Zn–air batteries exhibited good discharge potential and charge potential with high stability, respectively. Overall, all results illustrated that (SmSr)0.95Co0.9Pt0.1O3 is an excellent OER electrocatalyst for zinc–air batteries. Additionally, this work opens a good way to synthesize highly efficient electrocatalysts from A-site deficient perovskites.

Promoting Bifunctional Oxygen Catalyst Activity of Double-Perovskite-Type Cubic Nanocrystallites for Aqueous and Quasi-Solid-State Rechargeable Zinc-Air Batteries

“…In addition, such integration in perovskite oxides can be easily achieved by facile one-step preparation in an ambient atmosphere, which is promising for practical production. In previous research, different single perovskite oxides (e.g., LaNiO 3 [18], La 1−x Sr x Co 1−y Mn y O 3−δ [19,20], LaMn 1−y Co y O 3−δ [21], Sr x Co 1−y Fe y O 3−δ [22,23], Sr(Co 0.8 Fe 0.2 ) 0.95 P 0.05 O 3−δ [24]) and double perovskite oxides (e.g., Sr 2 TiMnO 6 [25], Pr 0.5 Ba 0.5 Mn 1.8−x Nb x Co 0.2 O 6−δ [26], (PrBa 0.5 Sr 0.5 ) 0.95 Co 1.5 Fe 0.5 O 5+δ [27,28]) were developed and they showed promising capability for facilitating oxygen redox as catalysts for air cathodes in Zn-air batteries [29][30][31][32][33][34][35][36][37][38].…”

Perovskite Catalysts for Oxygen Evolution and Reduction Reactions in Zinc-Air Batteries

“…Generally, perovskite oxides are presented in the structural formula of ABO 3−δ which has shown the advantages of cheap prices, simple synthesis, controllable morphologies, optimal stability, and durability [30][31][32][33][34]. The A-site ions are usually alkaline/rare earth ions with ionic radius r A > 0.090 nm (like La, Pr, Nd, Ca, Sr, Ba, Ce, etc); and the B-site ions are transition metal ions with ionic radius r B > 0.051 nm (like Fe, Cr, Co, etc.).…”