Nickel-Doped La0.8Sr0.2Mn1-xNixO3 Nanoparticles Containing Abundant Oxygen Vacancies as an Optimized Bifunctional Catalyst for Oxygen Cathode in Rechargeable Lithium-Air Batteries
Nickel-Doped La0.8Sr0.2Mn1-xNixO3 Nanoparticles Containing Abundant Oxygen Vacancies as an Optimized Bifunctional Catalyst for Oxygen Cathode in Rechargeable Lithium-Air Batteries
复制标题
含有丰富氧空位的镍掺杂 La0.8Sr0.2Mn1-xNixO3 纳米颗粒作为可充电锂空气电池氧阴极的优化双功能催化剂
DOI：
10.1021/acsami.6b00296
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发表时间：
2016
影响因子：
9.5
通讯作者：
Zhang Dawei
中科院分区：
文献类型：
--
作者：
Wang Zhaodong;You Ya;Yuan Jing;Yin Ya-Xia;Li Yu-Tao;Xin Sen;Zhang Dawei
本文采用溶胶-凝胶法合成了掺镍锰氧化物（La_（0.8）Sr_（0.2）Mn_（1-x）Ni_xO_3，x= 0.2和0.4）和未掺杂的La_（0.8）Sr_（0.2）MnO_3，并将其用作锂空气电池氧阴极的双功能催化剂。结构和成分表征结果表明，与未掺杂的La_（0.8）Sr_（0.2）Mn_（1-x）Ni_xO_3（x= 0.2和0.4）相比，所制备的La_（0.8）Sr_（0.2）Mn_（1-x）Ni_xO_3（x= 0.2和0.4）表面含有更多的氧空位和一定量的Ni ~（3+）（eg= 1）。Ni掺杂的La0.8Sr0.2Mn1-xNixO 3（x= 0.2和0.4）比未掺杂的La0.8Sr0.2MnO3具有更高的双功能催化活性。特别地，La0.8Sr0.2Mn0.6Ni0.4O3具有比La0.8Sr0.2MnO3更低的析氧反应和氧还原反应之间的总过电位，并且该值甚至与商业Pt/C的值相当，而提供的成本大大降低。在锂空气电池中，添加La 0. 8 Sr 0. 2 Mn 0. 6 Ni 0. 4 O3催化剂的氧阴极在比容量和循环寿命方面表现出了最佳的电化学性能，并给出了合理的反应机理来解释性能的改善。
In this work, Ni-doped manganite perovskite oxides (La0.8Sr0.2Mn1–xNixO3,x= 0.2 and 0.4) and undoped La0.8Sr0.2MnO3were synthesized via a general and facile sol–gel route and used as bifunctional catalysts for oxygen cathode in rechargeable lithium–air batteries. The structural and compositional characterization results showed that the obtained La0.8Sr0.2Mn1–xNixO3(x= 0.2 and 0.4) contained more oxygen vacancies than did the undoped La0.8Sr0.2MnO3as well as a certain amount of Ni3+(eg= 1) on their surface. The Ni-doped La0.8Sr0.2Mn1–xNixO3(x= 0.2 and 0.4) was provided with higher bifunctional catalytic activities than that of the undoped La0.8Sr0.2MnO3. In particular, the La0.8Sr0.2Mn0.6Ni0.4O3had a lower total over potential between the oxygen evolution reaction and the oxygen reduction reaction than that of the La0.8Sr0.2MnO3, and the value is even comparable to that of the commercial Pt/C yet is provided with a much reduced cost. In the lithium–air battery, oxygen cathodes containing the La0.8Sr0.2Mn0.6Ni0.4O3catalyst delivered the optimized electrochemical performance in terms of specific capacity and cycle life, and a reasonable reaction mechanism was given to explain the improved performance.