熔融盐辅助的自组装：介孔LiCoO2和LiMn2O4薄膜的合成及钴酸锂的电催化水氧化性能研究,Small

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熔融盐辅助的自组装：介孔LiCoO2和LiMn2O4薄膜的合成及钴酸锂的电催化水氧化性能研究
Small ( IF 13.0 ) Pub Date : 2017-11-17 , DOI: 10.1002/smll.201701913
Gülbahar Saat ₁ , Fadime Mert Balci ₁ , Elif Pınar Alsaç ₁ , Ferdi Karadas _{1,

2} , Ömer Dag _{1,

2}

Affiliation

过渡金属锂酸盐（TML）的中孔薄膜属于促进电化学系统发展的重要材料组。这项研究表明了一种简单的一锅法来合成介孔LiCoO ₂和LiMn ₂ O ₄薄膜的第一个实例。熔融盐辅助的自组装可用于建立生产中孔TML薄膜的简便方法。盐（LiNO ₃和[Co（H ₂ O）₆ ]（NO ₃）₂或[Mn（H ₂ O）₄ ]（NO ₃）₂）和两种表面活性剂（10-月桂基醚和溴化乙基三甲基铵（CTAB）或硝酸乙基三甲基铵（CTAN））形成稳定的液晶中间相。在中间相的亲水域中组装必要量的盐时，需要使用带电的表面活性剂，以在煅烧时产生稳定的金属锂酸盐孔壁。所述膜具有大的孔径和高的表面积，其可以增加至82m ² g ^-1。可以采用所描述的方法来合成其他金属氧化物和金属锂酸盐。LiCoO ₂的介孔薄膜在pH 7和14的条件下，作为水氧化催化剂表现出令人鼓舞的性能。使用CTAN作为辅助表面活性剂制备的电极在其他LiCoO ₂系统中显示出最低的过电势，在10 mA cm ^–2时低至376 mV，在1 mA cm ^–2时低至282 mV 。

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Molten Salt Assisted Self‐Assembly: Synthesis of Mesoporous LiCoO2 and LiMn2O4 Thin Films and Investigation of Electrocatalytic Water Oxidation Performance of Lithium Cobaltate

Mesoporous thin films of transition metal lithiates (TML) belong to an important group of materials for the advancement of electrochemical systems. This study demonstrates a simple one pot method to synthesize the first examples of mesoporous LiCoO₂ and LiMn₂O₄ thin films. Molten salt assisted self‐assembly can be used to establish an easy route to produce mesoporous TML thin films. The salts (LiNO₃ and [Co(H₂O)₆](NO₃)₂ or [Mn(H₂O)₄](NO₃)₂) and two surfactants (10‐lauryl ether and cethyltrimethylammonium bromide (CTAB) or cethyltrimethylammonium nitrate (CTAN)) form stable liquid crystalline mesophases. The charged surfactant is needed for the assembly of the necessary amount of salt in the hydrophilic domains of the mesophase, which produces stable metal lithiate pore‐walls upon calcination. The films have a large pore size with a high surface area that can be increased up to 82 m² g⁻¹. The method described can be adopted to synthesize other metal oxides and metal lithiates. The mesoporous thin films of LiCoO₂ show promising performance as water oxidation catalysts under pH 7 and 14 conditions. The electrodes, prepared using CTAN as the cosurfactant, display the lowest overpotentials in the literature among other LiCoO₂ systems, as low as 376 mV at 10 mA cm^–2 and 282 mV at 1 mA cm^–2.

更新日期：2017-11-17

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