A platinum-reduced graphene oxide thin film composite (Pt@rGO, 100 nm) was prepared on a fluorine-doped tin oxide(FTO-) coated glass substrate by a screen printing method using a Pt@rGO screen printing paste (0.12% Pt; Pt/rGO = 1:5w/w). The asprepared electrode (denoted as Pt@rGO/FTO) was used as the cathode for the assembly of dye-sensitized solar cells (DSSCs). It showed a well-dispersed and high loading of Pt on rGO surface with a particle size distributed around 10 nm. The redox behavior of ferrocene was performed at Pt/FTO, Pt@rGO/FTO, and rGO/FTO electrodes by a cyclic voltammetry (CV) method. The kinetic parameters, in particular, the standard reduction potential (E0, V), the transfer coefficient (α), the heterogeneous rate constant (k0, cm·s ), and the diffusion coefficient (D, cm s), were determined by CV data treatment using convolutiondeconvolution and fitting methods. The values of E0, α, k0, and D at Pt@rGO/FTO electrode were, respectively, 326mV, 0.471, 3.33 cm·s, and 4.19 cm·s, equivalent to those of Pt/FTO electrode (340mV, 0.474, 3.18 cm·s, and 4.19 cm·s). The Pt@rGO/FTO electrode exhibited excellent electrocatalytic activity compared to that of Pt thin film (Pt/FTO electrode) prepared from Pt commercial paste. The heterogeneous electron transfer rate constant k0 (cm·s ) for I3 /I at Pt@rGO/FTO is 1.3 times faster than that at Pt/FTO. The energy conversion efficiency of the DSSCs assembled from Pt@rGO-DSSC cathode reached 7.0%, an increase of 20.7% over the commercial Pt-based cathode (Pt-DSSC, 5.8%). The rGO component in the Pt@rGO composite plays two important roles: (i) facilitating the electron transfer between Pt NPs catalyst and the FTO substrate via the bandgap effect and (ii) the enlargement catalytic surface area of Pt NPs via the loading effect. The rGO material has, therefore, potential to replace the Pt content and improve the performance of the DSSC device.

中文翻译：

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载铂还原氧化石墨烯复合材料 (Pt@rGO) 作为染料敏化太阳能电池的高性能阴极的制备和电化学行为研究

使用Pt@rGO丝网印刷浆料（0.12% Pt），通过丝网印刷法在掺氟氧化锡（FTO-）涂层玻璃基板上制备铂还原氧化石墨烯薄膜复合材料（Pt@rGO，100 nm） ; Pt/rGO = 1:5w/w)。所制备的电极（表示为 Pt@rGO/FTO）用作组装染料敏化太阳能电池（DSSC）的阴极。它在 rGO 表面显示出良好分散和高负载的 Pt，粒径分布在 10 nm 左右。通过循环伏安法 (CV) 方法在 Pt/FTO、Pt@rGO/FTO 和 rGO/FTO 电极上进行二茂铁的氧化还原行为。动力学参数，特别是标准还原电位 (E0, V)、转移系数 (α)、异质速率常数 (k0, cm·s) 和扩散系数 (D, cm·s)，由使用卷积反卷积和拟合方法的 CV 数据处理确定。Pt@rGO/FTO 电极的 E0、α、k0 和 D 值分别为 326mV、0.471、3.33 cm·s 和 4.19 cm·s，相当于 Pt/FTO 电极的值（340mV、0.474、 3.18 厘米·s 和 4.19 厘米·s）。与由 Pt 商业浆料制备的 Pt 薄膜（Pt/FTO 电极）相比，Pt@rGO/FTO 电极表现出优异的电催化活性。Pt@rGO/FTO 处 I3 /I 的异质电子转移速率常数 k0 (cm·s ) 比 Pt/FTO 处快 1.3 倍。由 Pt@rGO-DSSC 正极组装而成的 DSSCs 的能量转换效率达到 7.0%，比商用 Pt 基正极（Pt-DSSC，5.8%）提高了 20.7%。Pt@rGO 复合材料中的 rGO 组件起着两个重要的作用：(i) 通过带隙效应促进 Pt NPs 催化剂和 FTO 底物之间的电子转移和 (ii) 通过负载效应扩大 Pt NPs 的催化表面积。因此，rGO 材料有可能取代 Pt 含量并提高 DSSC 设备的性能。