Nanoarchitecture of variable sized graphene nanosheets incorporated into three-dimensional graphene network for dye sensitized solar cells |
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| Affiliation: | 1. Joint Lab with Wuhu Token for Graphene Electrical Materials and Application, Department of Physics, Shanghai Normal University, Guilin Road 100, Shanghai 200234, China;2. Department of Opto-electric Information Materials and Quantum Devices, School of Materials Science and Engineering, Harbin Institute of Technology, 150001 Harbin, China;1. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou, 215123 Jiangsu, PR China;3. Jiangsu United Chemical Co., Ltd., East of Yangzhong Bridge, 212212 Yangzhong, PR China;1. Department of Organic and Nano Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea;2. Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea;3. Department of Chemical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea;1. National Laboratory Astana, Nur-Sultan, 010000, Kazakhstan;2. School of Engineering, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan;3. Department of Chemistry, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan;1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 100 Hai Quan Road, Shanghai, 201418, PR China;2. College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, PR China;3. Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China;4. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, PR China |
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| Abstract: | A novel three-dimensional (3D) nanoarchitecture consisting of hybrid graphene nanosheets (GNs)/graphene foam (GF) was fabricated on the FTO conducting substrate as a high efficient counter electrode (CE) for dye sensitized solar cells (DSSCs). The GNs with various sized such as large-sized heat-reduced graphene nanosheets (H-GNs) and small-sized laser-reduced graphene quantum dots (L-GQDs) were synthesized and used as catalytic materials incorporated into a 3D GF network, respectively. In this design, the aggregations and restacking of GNs were efficiently reduced, which is beneficial for increasing the amount of the active defective sites at the edges of graphene to the electrolyte solution. Especially, L-GQDs with smaller dimension less than 100 nm have more active defective sites at edges, providing superiority over the large-sized H-GNs in terms of electrocatalytic activity. Meanwhile, the GF network with high conductivity provides fast electron transport channels for charge injection between the GNs and FTO. The DSSC with this hybrid CE exhibited energy conversion efficiency (η) of 7.70% with an open circuit voltage (VOC), short circuit photocurrent density (JSC) and fill factor (FF) of 760 mV, 15.21 mA cm−2, and 72.0%, respectively, which is comparable to that of the conventional Pt CE (7.68%). |
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