Perovskites are a challenging new class of highly efficient bifunctional catalysts that hold huge significance in advanced batteries and water electrolysis. The surface chemistry and surface electronic structures of the La_0.6Sr_0.4CoO_3−δ (LSC) perovskite is greatly modified upon postsynthesis sintering. Herein, a new strategy has been demonstrated by intense pulsed light technology to accomplish the sintering process in milliseconds, and is comparatively explored with conventionally sintered LSC. The optimized sintering conditions rejuvenated a new class of a highly active bifunctional LSC electrocatalyst. The electrochemical activity and surface characteristics are orders of magnitude superior to those of the thermally sintered LSC. The best performing LSC catalyst known as LSC 30 exhibits outstanding bifunctionality with a low overpotential (∼0.89 V). Furthermore, LSC 30 shows a positively shifted onset potential of 0.92 V and a high limiting current of −6.1 mA cm^–2 at 20 mV s^–1, during the oxygen reduction reaction in alkaline medium. When tested as the air cathode of a zinc–air battery, LSC 30 delivered a steady performance for 200 cycles. This study highlights the role of the new concept in the agile synthesis of perovskite oxides for oxygen catalysis and possible application as the air cathode in metal air batteries.

中文翻译：

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利用快速闪光烧结技术优化La _0.6 Sr _0.4 CoO _3−δ钙钛矿氧化物的表面特性，以使其易于制备并在碱性介质中具有快速反应动力学

钙钛矿是具有挑战性的新型高效双功能催化剂，在高级电池和水电解中具有重要意义。La _0.6 Sr _0.4 CoO _3−δ的表面化学和表面电子结构（LSC）钙钛矿在合成后的烧结过程中被大大改性。本文中，强脉冲光技术已经证明了一种新的策略，可以在几毫秒内完成烧结过程，并且已与传统的烧结LSC进行了比较研究。优化的烧结条件使新型的高活性双功能LSC电催化剂焕发出新的活力。电化学活性和表面特性比热烧结的LSC要好几个数量级。性能最佳的LSC催化剂LSC 30表现出出色的双功能性，且低电势（〜0.89 V）。此外，LSC 30在20 mV s ^–1时显示出0.92 V的正向偏移起始电位和−6.1 mA cm ^–2的高极限电流，在碱性介质中进行氧还原反应期间。当作为锌-空气电池的空气阴极进行测试时，LSC 30可提供200次循环的稳定性能。这项研究强调了新概念在钙钛矿氧化物的敏捷合成中的作用，以进行氧催化，并可能将其用作金属空气电池中的空气阴极。