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首页> 外文期刊>RSC Advances >La1?xAgxMnO3 electrocatalyst with high catalytic activity for oxygen reduction reaction in aluminium air batteries
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La1?xAgxMnO3 electrocatalyst with high catalytic activity for oxygen reduction reaction in aluminium air batteries

机译：La 1？ x Ag x MnO 3 对氧具有高催化活性的电催化剂铝空气电池的还原反应

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摘要

The LaMnO3 (LMO) perovskite catalyst has been proposed as one of the best oxygen reduction reaction catalysts (ORRCs) to substitute noble metals. However, its ORR catalytic activity needs to be further improved. Here, La1?xAgxMnO3 (LAM) perovskites doped with Ag are synthesized by a facile improved sol–gel method. The structures, morphologies and valence states of Mn and oxygen adsorption behaviors of these LAM samples are characterized, and their catalytic activities toward ORR are studied by the rotating ring-disk electrode (RRDE) and aluminum air battery technologies. The results demonstrate that the doping of 30% Ag in the A-site of LMO (LAM-30) can effectively improve its ORR catalytic activity due to the regulation of the manganese valence and improvement of the oxygen adsorption capacity. Besides the remarkable ORR catalytic activity, the LAM-30 catalyst exhibits good durability. The current retention is as high as 98% after the aging test for 10?000 seconds. In addition, the maximum power density of the aluminum air battery using LAM-30 as the ORRC can reach 230.2 mW cm?2, which indicates that LAM-30 can be used as a promising ORRC in aluminum air batteries.
机译：有人提出将LaMnO 3 （LMO）钙钛矿催化剂用作替代贵金属的最佳氧还原反应催化剂（ORRC）之一。但是，其ORR催化活性需要进一步提高。在这里，La 1？ x Ag x 锰掺杂的MnO 3 （LAM）钙钛矿是通过一种改进的溶胶-凝胶法合成的。表征了这些LAM样品的Mn的结构，形态和价态以及氧的吸附行为，并通过旋转圆盘电极（RRDE）和铝空气电池技术研究了它们对ORR的催化活性。结果表明，由于调节了锰的化合价并提高了氧的吸附能力，在LMO（LAM-30）的A位上掺杂30％的Ag可以有效地提高其ORR催化活性。除了出色的ORR催化活性外，LAM-30催化剂还具有良好的耐久性。老化测试10？000秒后，电流保持率高达98％。另外，使用LAM-30作为ORRC的铝制空气电池的最大功率密度可以达到230.2 mW cm ？2 ，表明可以使用LAM-30。作为有希望的铝制空气电池ORRC。

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