화학공학소재연구정보센터
Applied Catalysis B: Environmental, Vol.241, 95-103, 2019
Novel and multifunctional inorganic mixing salt-templated 2D ultrathin Fe/Co-N/S-carbon nanosheets as effectively bifunctional electrocatalysts for Zn-air batteries
2D bimetallic and bi-nonmetallic codoping porous carbon nanosheets with more accessible surface area and active sites are especially potential electrocatalyst for oxygen reduction and oxygen evolution reaction (ORR and OER) of Zn-air batteries but the synthesis of this material has been rarely reported owing to excessively harsh requirements. Here, bimetallic (Fe/Co) and bi-nonmetallic (N/S) codoping porous carbon nanosheets (Fe/Co-N/S-Cs) with uniform and ultrathin thickness of about 4.63 nm were first synthesized by a novel and multifunctional inorganic mixing salt-template (FeCl3 and CoSO4). Fe/Co-N/S-Cs exhibit ultrahigh specific surface area (SSA: 1589 m(2) g(-1)), total pore volume (TPV: 0.92 cm(3) g(-1)), homogeneous distribution of heteroatom dopants, as well as an appropriate amount of carbon defects. Fe/Co-N/S-Cs show high half-wave potential (E-1/2 = 0.832 V) for ORR and extremely low overpotential of 285 mV at 10 mA cm(-2) for OER, exceeding most reported electrocatalysts. Furthermore, assembled Zn-air batteries employing Fe/Co-N/S-Cs as cathode catalyst exhibit high power density (102.63 mW cm(-2)) and excellent stability. This investigation sheds light on syntheses of superior but cheap electrocatalysts for developing next energy-related storage technology.