Developing non-precious metal catalyst with high activity, good stability and low cost for electrocatalytic oxygen reduction reaction（ORR） is critical for the wide application of energy conversion system. Here, we d...Developing non-precious metal catalyst with high activity, good stability and low cost for electrocatalytic oxygen reduction reaction（ORR） is critical for the wide application of energy conversion system. Here, we developed a cost–effective synthetic strategy via silica assistance to obtain a novel FeC/Fe–N–C（named as COPBP-PB-Fe-900-SiO） catalyst with effective active sites of Fe–Nand FeC from the rational design two-dimensional covalent organic polymer（COPBP-PB）. The nitrogen-rich COP effectively promotes the formation of active Fe–Nsites. Additionally, the silica not only can effectively suppress the formation of large Fe-based particles in the catalysts, but also increases the degree of carbonization of the catalyst.The as-prepared COPBP-PB-Fe-900-SiOcatalyst exhibits high electrocatalytic activity for ORR with a halfwave potential of 0.85 V vs. reversible hydrogen electrode（RHE）, showing comparable activity as compared with the commercial Pt/C catalysts in alkaline media. Moreover, this catalyst also shows a high stability with a nearly constant onset potential and half-wave potential after 10,000 cycles. The present work is highly meaningful for developing ORR electrocatalysts toward wide applications.展开更多
基金supported by the National Key Research and Development Program of China(2017YFA0206500)NSF of China(51502012+8 种基金2167602021620102007)Beijing Natural Science Foundation(2162032)The Start-up fund for talent introduction of Beijing University of Chemical Technology(buctrc201420buctrc201714)Talent cultivation of State Key Laboratory of OrganicInorganic CompositesThe Fundamental Research Funds for the Central Universities(ZD1502)Distinguished scientist program at BUCT(buctylkxj02)the“111”project of China(B14004)
文摘Developing non-precious metal catalyst with high activity, good stability and low cost for electrocatalytic oxygen reduction reaction（ORR） is critical for the wide application of energy conversion system. Here, we developed a cost–effective synthetic strategy via silica assistance to obtain a novel FeC/Fe–N–C（named as COPBP-PB-Fe-900-SiO） catalyst with effective active sites of Fe–Nand FeC from the rational design two-dimensional covalent organic polymer（COPBP-PB）. The nitrogen-rich COP effectively promotes the formation of active Fe–Nsites. Additionally, the silica not only can effectively suppress the formation of large Fe-based particles in the catalysts, but also increases the degree of carbonization of the catalyst.The as-prepared COPBP-PB-Fe-900-SiOcatalyst exhibits high electrocatalytic activity for ORR with a halfwave potential of 0.85 V vs. reversible hydrogen electrode（RHE）, showing comparable activity as compared with the commercial Pt/C catalysts in alkaline media. Moreover, this catalyst also shows a high stability with a nearly constant onset potential and half-wave potential after 10,000 cycles. The present work is highly meaningful for developing ORR electrocatalysts toward wide applications.
