Sr掺杂镧锰氧化物/石墨烯对电极的催化性能研究

Catalytic Properties of Sr-doped Lanthanum Manganite Oxide/RGO Counter Electrode

以商用TiO_2薄膜为光阳极,以溶胶-凝胶法合成的Sr掺杂镧锰氧化物La0.67Sr0.33Mn O3(LSMO)纳米颗粒为对电极,为电解液,组装染料敏化太阳能电池(DSSC)。通过电化学阻抗谱(EIS)、塔菲尔极化曲线(Tafel曲线)、循环伏安曲线(CV曲线)、伏安特性曲线(J-V曲线)对制备的对电极进行光电性能分析。为了进一步提高LSMO纳米颗粒对电极的能量转化效率,在LSMO纳米颗粒中加入还原氧化石墨烯(RGO),通过简单的物理混合法制备了LSMO/RGO纳米复合材料。这种复合材料在还原I-3方面表现出更优异的电催化性能。与Pt对电极(6.942%)相比,其能量转化效率(PCE)达到了6.567%。

Using commercial TiO 2 thin film as photoanodes, the La0.67Sr0.33MnO3 （ LSMO） nanoparticles synthesized by the sol-gel method as the counter electrode （ CE） and electrolyte, the dye-sensitized solar cells （ DSSCs） were assembled. The catalytic property of the as-prepared CE was carried out by the electrochemical impedance spectroscopy （ EIS ） , Tafel polarization curves （ Tafel curves ） , Cyclic voltammetry curves （ CV curves） and photocurrent density-voltage curves （ J - V curves） . In order to improve the power conversion efficiency of the LSMO nanoparticles CE, reduced graphene oxide （ RGO） were added into the LSMO nanoparticles. The nanocomposites of the LSMO nanoparticles with RGO （LSMO/RGO） were prepared through simple physical mixing. This material demonstrates superior electrocatalytic activity for the I3^- reduction. Compared with Pt （6. 942% ） , the power conversion efficiency （PCE） is 6. 567%.