The electrochemical conversion of carbon dioxide into valuable chemicals is a feasible way to mitigate the negative impacts of overmuch carbon dioxide emissions. Porphyrin-based metal organic frameworks (MOFs) are expected to be used for selective and efficient electrochemical carbon dioxide reduction (ECR) with porous structure and ordered active sites. Herein, we report the synthesis of a monodispersed and spherical organic/inorganic hybrid Cu-TCPP@Cu2O electrocatalyst composed of Cu-TCPP (TCPP=tetrakis (4-carboxyphenyl) porphyrin) and Cu2O, where TCPP play significant roles in regulating the morphology. In-situly formed Cu during ECR process in combination with Cu-TCPP (Cu-TCPP@Cu) can suppress hydrogen evolution, enrich CO intermediate and promote C-C coupling towards C2 products. Cu-TCPP@Cu supported on porous carbon (PC) show ultrafine Cu nanoclusters on PC and displays high ECR activity and selectivity towards C2 products, with a C2 faradaic efficiency of 62.3% at –1.0 V versus the reversible hydrogen electrode (RHE) and a C2 partial current density of 83.4 mA cm–2, which is 7.6 times and 13.1 times that of pure Cu2O and TCPP. In this paper, the morphology and hybrid structure of the catalyst were studied to improve the selectivity of ECR to produce C2 products, which provided a new idea for the design of high-performance ECR catalyst.
organic/inorganic hybrid electrocatalysts, TCPP, cuprous oxide, cascade electrocatalysts
Zi-xuan Wan, Aidar Kuchkaev, Dmitry Yakhvarov, Xiong-wu Kang.
Monodispersed Cu-TCPP/Cu2O hybrid microspheres: a superior cascade electrocatalyst towards CO2 reduction to C2 products[J]. Journal of Electrochemistry, doi: 10.13208/j.electrochem.2303271.