Dual metal-Nx active sites co-modified ZIF-derived porous carbon: Effective catalysts for boosting triiodide reduction reaction
作者单位：云斯宁西安建筑科技大学材料科学与工程学院功能材料研究所
会议名称：《2021全国太阳能电池材料器件与技术大会》
会议日期：2021年
学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
关 键 词：Electrocatalyst Dual meta-Nx sites Triiodide reduction reaction DFT calculation Dye-sensitized solar cells
摘 要：Triiodide reduction(IRR) is an important chemical reaction in dye-sensitized solar cells(DSSCs), and the reaction rate will greatly affects the photovoltaic performance of devices. The counter electrode(CE) is an important component to catalyze IRR in DSSC. Using a CE with high catalytic activity can boost the IRR performance. In this work, Cu/Ni-Nx and Mo/Ni-Nx active sites co-modified Cu/Ni-N-C and Mo/Ni-N-C catalysts are prepared through modifying ZIF-derived porous carbon and used as the CE for catalyzing IRR in *** from the high specific surface area, modified the electronic structure of carbon substrate, as well as the synergistic effect between different metal heteroatoms, the Cu/Ni-N-C and Mo/Ni-N-C exhibit enhanced catalytic activity compare with Ni-N-C. As a result, the DSSCs based on Cu/Ni-N-C and Mo/Ni-N-C CEs yield power conversion efficiencies of 7.62% and 7.93%, exceeding that of Pt(7.29%) and Ni-N-C(7.16%). In addition, Cu/Ni-N-C and Mo/Ni-N-C show superior stability in a corrosive electrolyte. The catalytic mechanism of Cu/Ni-N-C and Mo/Ni-N-C catalysts for IRR is unveiled by DFT calculations. This work provides a guidance for preparing other metal-Nx active sites modified carbon-based catalysts in new energy fields.