The development of efficient transition metal oxygen reduction reaction(ORR)catalysts as substitutes for platinumbased catalysts has served as a key strategy in advancing the commercialization of fuel cells.Herein,an ...The development of efficient transition metal oxygen reduction reaction(ORR)catalysts as substitutes for platinumbased catalysts has served as a key strategy in advancing the commercialization of fuel cells.Herein,an effective Fe-N-C catalyst for the ORR was fabricated with hemin as the iron source of Fe-NX active sites through a simple precipitation-pyrolysis method.With the aid of hemin,the leaf-like ZIF-8 synthesized in an aqueous environment can be driven to transform into a stable three-dimensional dodecahedral structure,resulting in a substantial increase in the yield of Fe-N-C materials.Meanwhile,the influence of hemin loading in the precursors and pyrolysis temperature on the oxygen reduction catalytic activity of the final product Fe-N-C was investigated.Concretely,the optimal Fe100-N-C950 displays an onset potential of 1.054 V(vs.RHE)and a half-wave potential of 0.847 V(vs.RHE).Additionally,the direct ethanol fuel cell(DEFC)with Fe100-N-C950 as the cathode catalyst demonstrated a higher power density than the one with the commercial Pt-C catalyst.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.52106110,52306099)the Frontier Interdisciplinary Field Cultivation Special Fund of Xi’an University of Architecture and Technology(Grant No.X20240114)+1 种基金the Shaanxi Province Technical Innovation Guidance Special Project(Grant No.2023GXLH-051)the Youth Innovation Team of Shaanxi Universities.
文摘The development of efficient transition metal oxygen reduction reaction(ORR)catalysts as substitutes for platinumbased catalysts has served as a key strategy in advancing the commercialization of fuel cells.Herein,an effective Fe-N-C catalyst for the ORR was fabricated with hemin as the iron source of Fe-NX active sites through a simple precipitation-pyrolysis method.With the aid of hemin,the leaf-like ZIF-8 synthesized in an aqueous environment can be driven to transform into a stable three-dimensional dodecahedral structure,resulting in a substantial increase in the yield of Fe-N-C materials.Meanwhile,the influence of hemin loading in the precursors and pyrolysis temperature on the oxygen reduction catalytic activity of the final product Fe-N-C was investigated.Concretely,the optimal Fe100-N-C950 displays an onset potential of 1.054 V(vs.RHE)and a half-wave potential of 0.847 V(vs.RHE).Additionally,the direct ethanol fuel cell(DEFC)with Fe100-N-C950 as the cathode catalyst demonstrated a higher power density than the one with the commercial Pt-C catalyst.
