Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2022-10-03 , DOI: 10.1016/j.jallcom.2022.167455 Qiu Zhang , Yuekun Zhang , Tingting Zhang , Fengyan Li , Lin Xu
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The challenge of boosting the efficiency of QDSSCs lies in the rational development and design of economical, stable and efficient counter electrode (CE) catalysts for fast and efficient electron transport at the CE/electrolyte interface. Here, we creatively construct Co9S8/Cu7S4 heterostructure composite CEs using CuCo-Prussian blue analogs (PBA) as precursor by one-step in-situ solvothermal vulcanization method. Work function analysis and systematic electrochemical characterizations reveal that the presence of heterojunctions in the Co9S8/Cu7S4 can increase the interfacial electric field driving force inside the material, thereby reducing the Rct at CE/electrolyte interface, promoting the efficient transfer of electrons. Correspondingly, the Co9S8/Cu7S4 composite CE can improve the stability and compensate for the deficiency of the single component CE through a decent synergistic catalytic effect. Remarkably, the Mn-CdS/CdSe/ZnS co-sensitized QDSSC equipped with Co9S8/Cu7S4 heterostructure composite CE delivers an optimal conversion efficiency of 8.43% with Jsc = 23.42 mA/cm2, Voc = 0.672 V; FF = 0.54, which was significantly superior to physically mixed CE (PM-Co9S8/Cu7S4, 6.55%), single-component CE (Cu7S4, 5.60%; Co9S8, 5.13%) and conventional Brass/Cu2S CE (4.96%). In briefly, the advanced heterostructure engineering and the abundant, tunable chemical elemental composition of PBA provide new views for the purposeful design of economical and outstanding heterostructured composite CEs.
中文翻译:
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用于量子点敏化太阳能电池的高效稳定的异质结构 Co9S8/Cu7S4 复合反电极源自普鲁士蓝类似物
提高 QDSSC 效率的挑战在于合理开发和设计经济、稳定和高效的对电极 (CE) 催化剂,以在 CE/电解质界面实现快速高效的电子传输。在此,我们创造性地以CuCo-普鲁士蓝类似物(PBA)为前驱体,通过一步原位溶剂热硫化法构建了Co 9 S 8 /Cu 7 S 4异质结构复合材料CEs。功函数分析和系统电化学表征表明,Co 9 S 8 /Cu 7 S 4中存在异质结。可以增加材料内部的界面电场驱动力,从而降低CE/电解质界面处的R ct,促进电子的有效转移。相应地,Co 9 S 8 /Cu 7 S 4复合CE可以通过良好的协同催化作用提高稳定性,弥补单组分CE的不足。值得注意的是,配备 Co 9 S 8 /Cu 7 S 4异质结构复合材料 CE 的 Mn-CdS/CdSe/ZnS 共敏化 QDSSC 在 J sc = 23.42 mA/cm 2 , V oc时提供了 8.43% 的最佳转换效率= 0.672 伏;FF = 0.54,明显优于物理混合CE(PM-Co 9 S 8 /Cu 7 S 4,6.55%)、单组分CE(Cu 7 S 4,5.60%;Co 9 S 8,5.13%)和传统的黄铜/Cu 2 S CE (4.96%)。简而言之,PBA先进的异质结构工程和丰富的、可调节的化学元素组成为有目的地设计经济、卓越的异质结构复合材料CE提供了新的视角。