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N- and S-doped nanoporous carbon framework derived from conjugated microporous polymers incorporation with ionic liquids for efficient oxygen reduction reaction
Materials Today Energy ( IF 9.3 ) Pub Date : 2020-01-28 , DOI: 10.1016/j.mtener.2020.100382
Rui Jiao , Wanli Zhang , Hanxue Sun , Zhaoqi Zhu , Zifeng Yang , Weidong Liang , An Li

The rapid growth of high-performance metal-free electrocatalysts is of great significance for widespread realization of fuel cells since noble metals (e.g. platinum) used as electrocatalysts have long been considered as major bottleneck which limited their commercialization. Herein, we report the creation of a kind of novel porous carbon framework containing dual heteroatoms (N and S, named as C-CMPs-NS), which was fabricated by direct pyrolysis of ionic liquids loaded on conjugated microporous polymers, application of highly efficient metal free electrocatalyst in oxygen reduction reaction (ORR). Due to their large specific surface area, outstanding porosity and, significantly, active sites exposed own to high density doping of S and N, the catalyst showed good oxygen reduction reaction activity in alkaline electrolyte. The C-CMPs-1NP yielded a half-wave potential of 0.82 V, high onset potential (0.98 V vs. RHE), the high diffusion limiting current density of 4.2 mA cm−2 and better methanol tolerance than commercial Pt/C where nearly no ORR polarization curve shift and no change of oxygen reduction peak in cyclic voltammetry (CV) were observed in 3.0 M methanol solution. Based on these merits mentioned above, the C-CMPs-NS may hold great potentials as promising alternative of precious metal catalysts for next generation fuel cells.



中文翻译:

N和S掺杂的纳米多孔碳骨架,由共轭微孔聚合物与离子液体结合而成,可进行有效的氧还原反应

高性能无金属电催化剂的快速增长对于燃料电池的广泛实现具有重要意义,因为长期以来一直将用作电催化剂的贵金属(例如铂)视为限制其商业化的主要瓶颈。在本文中,我们报告了一种新型的含有双杂原子(N和S,分别称为C-CMPs-NS)的多孔碳骨架的创建,该骨架是通过将负载在共轭微孔聚合物上的离子液体直接热解,高效应用而制成的氧还原反应(ORR)中的不含金属的电催化剂。由于它们的大的比表面积,优异的孔隙率以及显着暴露于S和N的高密度掺杂的活性位点,该催化剂在碱性电解质中显示出良好的氧还原反应活性。在市售Pt / C中,其−2值和更好的甲醇耐受性,在3.0 M甲醇溶液中,在循环伏安法(CV)中几乎没有观察到ORR极化曲线移动,也没有观察到氧还原峰的变化。基于上述优点,C-CMPs-NS有望成为下一代燃料电池的有前途的贵金属催化剂替代品。

更新日期:2020-01-28
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