Yoon, Seok-Woo Van-Duong Dao Larina, Liudmila L. Lee, Joong-Kee Choi, Ho-Suk 2024-01-20T05:03:45Z 2024-01-20T05:03:45Z 2022-01-25 2016-01 0008-6223 https://pubs.kist.re.kr/handle/201004/124523 This study reports on the synthesis of a PtCo alloy/reduce graphene oxide (RGO) nanohybrid materials and their application as an efficient counter electrodes (CEs) in dye-sensitized solar cells (DSCs). Bimetallic Pt0.1Co0.9 nanoparticles (NPs) with average size of similar to 5 nm were successfully and uniformly immobilized on the surface of RGO after co-reduction of metal precursor ions and graphene oxide into bimetallic alloy and RGO, respectively, via dry plasma reduction under an atmospheric pressure and near room temperature. Furthermore, the set of bimetallic PtCo/RGO nanohybrids were also synthesized using various volume ratios of Pt to Co precursors. Uniform and dense distribution of bimetallic PtCo NPs on the RGO surface was obtained. The highest electrocatalytic performance, which corresponded to the lowest charge transfer resistance of 2.26 Omega, was achieved with the Pt0.1Co0.9 NPs/RGO nanohybrid. The application of developed nanohybrid as an alternative CE for DSCs leads to increase in efficiency by 5.7% over that of the Pt/RGO-based DSC, and by 40.6% over the efficiency of the Pt-free device. We believe that this work provides an effective strategy for optimizing Pt utilization in photovoltaic-device targeted nanohybrid, suggesting the decrease of the production cost of DSCs along with the improvement of efficiency. (C) 2015 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD Optimum strategy for designing PtCo alloy/reduced graphene oxide nanohybrid counter electrode for dye-sensitized solar cells Article 10.1016/j.carbon.2015.09.067 1 CARBON, v.96, pp.229 - 236 CARBON 96 229 236 N scie scopus 000366078000029 2-s2.0-84947967698 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article LOW-COST PLATINUM NANOPARTICLES FACILE SYNTHESIS REDUCTION TRANSPARENT HYBRIDS