Bifunctional electrocatalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are developed with perovskite-type oxide catalyst and antimony-doped tin oxide (ATO) as an oxidation-resistant conductive additive to increase the stability under an oxidizing atmosphere. In conventional carbon-supported catalysts, carbon plays an important role not only in increasing electric conductivity but also in catalyzing the first 2-electron reaction of the ORR. The ATO-mixed catalyst itself requires a perovskite-type oxide (ABO₃) catalyst that is active in the first step of the ORR, such as La_0.6Ca_0.4MnO₃ (LCMO), because of the poor ORR activity of ATO. On the other hand, OER performance strongly depends on the composition of the perovskite oxide and La_0.6Ca_0.4CoO₃ (LCCO) shows high OER activity. Here, La_0.6Ca_0.4Co_0.7Mn_0.3O₃ (LCCMO), in which Co and Mn are mixed at the B site of the perovskite-type oxide, mixed with ATO is proposed as a carbon-free bifunctional catalyst that shows activity for both the ORR and OER. The activity and durability of gas-diffusion air electrodes with the bifunctional catalysts are evaluated in zinc–air batteries, and the results suggest that the catalyst with ATO achieved similar charge-discharge performance and a longer lifetime compared to the conventional catalyst with carbon.

利用钙钛矿型氧化物催化剂和掺锑氧化锡（ATO）作为抗氧化导电添加剂，开发了用于氧还原反应（ORR）和氧释放反应（OER）的双功能电催化剂，以提高氧化稳定性大气层。在常规的碳负载催化剂中，碳不仅在增加电导率方面而且在催化ORR的第一2-电子反应中都起重要作用。ATO混合催化剂本身需要在ORR第一步具有活性的钙钛矿型氧化物（ABO ₃）催化剂，例如La _0.6 Ca _0.4 MnO ₃（LCMO），因为ATO的ORR活性较差。另一方面，OER性能在很大程度上取决于钙钛矿氧化物的组成，并且La _0.6 Ca _0.4 CoO ₃（LCCO）显示出高的OER活性。在此，La _0.6 Ca _0.4 Co _0.7 Mn _0.3 O ₃（LCCMO），其中Co和Mn在钙钛矿型氧化物的B位混合，建议与ATO混合作为无碳双功能催化剂，对ORR和OER均具有活性。在锌-空气电池中评估了具有双功能催化剂的气体扩散空气电极的活性和耐久性，结果表明，与传统的含碳催化剂相比，含ATO的催化剂具有相似的充放电性能和更长的使用寿命。