首页|双金属Co/Fe-N-C催化剂合成及氧还原性能研究

双金属Co/Fe-N-C催化剂合成及氧还原性能研究

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质子交换膜燃料电池(PEMFC)因其铂基催化剂昂贵和资源稀缺,未能得到大规模应用,过渡金属氮掺杂碳(M-N-C,M=Fe,Ni,Mn,Co)单原子催化剂被认为是有潜力的氧还原反应(ORR)催化剂,其中Fe-N-C催化剂在酸性介质下具有较高的氧还原催化活性,成本低,受到广泛关注,被认为是最具有前途替代铂基催化剂的燃料电池催化剂,然而,大多数报道的Fe-N-C催化剂在燃料电池中的性能仍不如铂基催化剂,并且在酸性介质下稳定性差,而不能被广泛应用,在此,我们报道了一种以ZIF-67为前驱体,在具有稳定高石墨化NC载体上构建Fe-Nx和Co-Nx双活性位点,得到的Co/Fe-N-C双原子催化剂实现了 0.96V(vs.RHE)的起始电位(Eoneset)和0.79 V(vs.RHE)的半波电位(E1/2),对比Fe-N-C和Co-N-C催化剂有着更显著的稳定性和更优异的ORR活性,为提高Fe-N-C催化活性和耐久性提供一条新思路.
Synthesis and oxygen reduction performance study of bimetallic Co/Fe-N-C catalysts
Proton exchange membrane fuel cells(PEMFCs)have not been applied on a large scale due to their expensive platinum-based catalysts and scarce resources.Metal-nitrogen doped carbon(M-N-C,M=Fe,Ni,Mn,Co)monoatom-ic catalysts have been considered as promising catalysts for oxygen reduction reaction(ORR),among which Fe-N-C cat-alysts have high catalytic activity for oxygen reduction in acidic media with low cost.However,most of the reported Fe-N-C catalysts are still not as good as the platinum-based catalysts in fuel cells and have poor stability in acidic media rather than being widely used.Here,we reported a method for constructing Fe-Nx and Co-N,catalysts on a stable and highly graphitic NC support pyrolyzed from ZIF-67.The obtained Co/Fe-N-C diatomic catalyst achieved an onset poten-tial(Eoneset)of 0.96 V(vs.RHE)and a half-wave potential(E1/2)of 0.79 V(vs.RHE),with more remarkable stabili-ty and superior ORR activity compared with the Fe-N-C and Co-N-C catalysts,providing a new insight into enhance the activity and durability of Fe-N-C catalysts.

Proton exchange membrane fuel celloxygen reduction reactionbimetallic catalystnitrogen-doped carbonactive site

张俊、龙涛、李广环、侯亚庆、许春乾、武云

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广东石油化工学院材料科学与工程学院,广东茂名 525000

质子交换膜燃料电池 氧还原反应 双金属催化剂 氮掺杂碳 活性位点

广东省科技创新战略项目茂名市高层次人才创新项目广东石油化工学院人才引进项目广东石油化工学院人才引进项目大学生创新创业项目

2023S0050499233000075201077210000314573322192

2024

10.3969/j.issn.1001-9731.2024.08.019

功能材料
重庆材料研究院 中国仪器仪表学会仪表材料学会

功能材料

CSTPCD北大核心
影响因子：0.918
ISSN：1001-9731
年,卷(期)：2024.55(8)