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Molecular Linking Stabilizes Bi Nanoparticles for Efficient Electrochemical Carbon Dioxide Reduction

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journal contribution
posted on 02.06.2021, 19:36 by Li-Bing Zhang, Tang Tang, Jiaju Fu, Shuai Niu, Chao He, Jin-Song Hu, Li-Jun Wan
The electrochemical carbon dioxide reduction (ECR) into high-value-added chemicals is a promising approach to alleviate the energy crisis and greenhouse effect. However, the lack of efficient, highly selective, and durable electrocatalysts limits the further application of ECR. Herein, a molecular linking strategy is developed to anchor the monodispersed Bi nanoparticles on a carbon matrix, enabling the durable and efficient CO2 reduction into formate. Systematic characterizations and experimental measurements reveal that tetra-aminophenyl porphyrin (TAPP) can act as an effective molecular linker to secure Bi nanoparticles on porous carbon matrix (Bi NPs/TAPP-PC) via its strong interaction with both the support and nanoparticles, resolving the issues of their peel-off and agglomeration during ECR. Benefiting from the linkage of TAPP molecules, Bi NPs/TAPP-PC exhibits significantly improved ECR performance with a Faradaic efficiency of 92.1% and partial current density of 55.8 mA cm–2 as well as a long-term durability of over 20 h, compared with Bi NPs/PC without TAPP. This strategy using a molecular linker to enhance the activity and durability of the host catalyst provides new insights for developing applicable catalysts for diverse electrocatalytic applications.

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