Surface Functionalization of TiO2 Nanoparticles Influences the Conductivity of Ionic Liquid-Based Composite Electrolytes,ACS Applied Energy Materials

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Surface Functionalization of TiO2 Nanoparticles Influences the Conductivity of Ionic Liquid-Based Composite Electrolytes
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-12-12 00:00:00 , DOI: 10.1021/acsanm.9b01980
Pin Ma _{1,

2} , Yanyan Fang _{1,

2} , Di Zhang _{1,

2} , Hongbo Cheng ₃ , Nianqing Fu ₄ , Xiaowen Zhou ₁ , Shibi Fang ₁ , Yuan Lin _{1,

2}

Affiliation

As one of the main components of ionic liquid-based composite electrolytes, nanoparticles play a major role in determining the performance of such electrolytes. In this study, four different TiO₂-based nanoparticles are introduced into ionic liquid electrolytes to systematically investigate the influence of their conductivities and surface chemistries on the performance of composite electrolytes. Compared with conventional insulating nanoparticles, high-conductivity nanoparticles are free of blocking junctions, and the surface region of the nanoparticles can act as an additional pathway for ionic conduction. Meanwhile, the surface chemistry of the nanoparticle strongly determines the viscosity, network stability, and microscopic morphology of an ionic liquid-based composite electrolyte, thus affecting the ionic conductivity. Therefore, the highest conductivity of 4.29 mS cm^–1 is achieved by the ionic liquid-based composite electrolyte with the SC-HC-TiO₂ nanoparticle at a weight of 10 wt %, which has high conductivity and rich amino functional groups. DSCs using SC-HC-TiO₂ show a high efficiency of 8.12% due to the simultaneous improvement of photocurrent density (J_sc), open-circuit voltage (V_oc), and fill factor (FF).

中文翻译：

TiO ₂纳米粒子的表面功能化影响离子液体基复合电解质的电导率

作为基于离子液体的复合电解质的主要成分之一，纳米颗粒在决定此类电解质的性能方面起着重要作用。在这项研究中，四种不同的TiO ₂基纳米粒子被引入离子液体电解质中，以系统地研究其电导率和表面化学性质对复合电解质性能的影响。与常规绝缘纳米颗粒相比，高导电性纳米颗粒没有阻挡结，并且纳米颗粒的表面区域可以充当离子传导的附加途径。同时，纳米颗粒的表面化学性质强烈地决定了离子液体基复合电解质的粘度，网络稳定性和微观形态，从而影响了离子电导率。因此，具有SC-HC-TiO ₂的离子液体基复合电解质可实现4.29 mS cm ^–1的最高电导率重量为10wt％的纳米颗粒，其具有高电导率和丰富的氨基官能团。使用SC-HC-TiO _2的DSC由于同时提高了光电流密度（J _sc），开路电压（V _oc）和填充系数（FF）而显示出8.12％的高效率。

更新日期：2019-12-12

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