Well-designed dual metal Nb/Ta co-modified nitrogen doped carbon: An active sites-enriched catalyst

• 作 者: Xi Wang Jiaoe Dang Lishan Zhang Menglong Sun Shuanngxi Yuan Yinhao Wang Changwei Dang Yingying Deng Zhuolei Liu Sining Yun
• 机 构: Functional Materials Laboratory (FML), School of Materials science and Engineering,Xi'an University
• 出 处: 第八届新型太阳能材料科学与技术学术研讨会
• 发表日期: 2021年8期
• 关键词: Bimetal co-modification Triiodide reduction reaction Counter electrode Nitrogen-

　　The development of advanced catalysts with excellent catalytic ability and stability is critical for improving energy conversion efficiency in triiodide reduction reaction (IRR).To fabricate high-quality catalysts with abundant active sites,a series of transition-metal-modified nitrogen-doped carbon catalysts (Ta-N-C,Nb-N-C,and Nb/Ta-N-C) was successfully fabricated via pyrolysis and ion exchange.Owing to the high conductivity and ion transport capacity of its unique nitrogen-carbon structure and synergistic effect of dual-metal active sites on modulating electronic structure,Nb/Ta-N-C catalyst exhibited excellent catalytic performance and remarkable electrochemical stability.Nb/Ta-N-C catalyst achieved an ideal conversion efficiency of 8.45% in solar cells,which was higher than that of Pt electrode (7.63%).This work provided a new approach for the rational design of the active-sites-rich electrocatalysts for energy conversion applications.