Graphene wrapped Fe7C3 nanoparticles supported on N-doped graphene nanosheets for efficient and highly methanol-tolerant oxygen reduction reaction.
Graphene wrapped Fe7C3 nanoparticles supported on N-doped graphene nanosheets for efficient and highly methanol-tolerant oxygen reduction reaction.
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DOI：
10.1016/j.jcis.2019.08.064
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发表时间：
2019-11
影响因子：
9.9
通讯作者：
Guilan Wen;Hua‐Jie Niu;Ai-Jun Wang;Zheng-Zhi Yin;Qian-Li Zhang;Jiu-Ju Feng
中科院分区：
文献类型：
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作者：
Guilan Wen;Hua‐Jie Niu;Ai-Jun Wang;Zheng-Zhi Yin;Qian-Li Zhang;Jiu-Ju Feng
为了满足日益增长的清洁、安全和可持续能源的需求，制备了绿色高效的非贵金属氧还原反应电催化剂。在本文中，我们报道了一种新的、环境友好的方法，通过对三聚氰胺、铁(II)、酞菁(FePc)和Fe2O3的混合物进行简单的热处理，在具有开孔-介孔结构的分级纤维氮掺杂石墨烯(Fe7C3/NG)上制备了石墨烯包裹的碳化铁(Fe7C3)纳米颗粒。在对照组中，严格检查了热解温度和FePc与三聚氰胺的摩尔比的影响。值得注意的是，在800 °C下得到的Fe_7C_3/NG(即Fe_7C_3/NG-800)在0.1 M KOH中的起始电位(0.98 V)和半波电位(0.85 V)与商用的Pt/C(50wt%)相比发生了前移，同时其耐久性(即使在40,000 S后仍保持其初始电流密度的92.11%)和较强的耐甲醇能力得到了极大的提高。这项研究为开发燃料电池中无铂、非贵重、高效的ORR电催化剂提供了一种有前途的策略。
Green and efficient non-precious metal electrocatalysts for oxygen reduction reaction (ORR) are prepared to meet the increasing demand for clean, secure and sustainable energy. Herein, we report a novel and environmentally friendly strategy for synthesis of graphene-wrapped iron carbide (Fe7C3) nanoparticles supported on hierarchical fibrous N-doped graphene with open-mesoporous structures (Fe7C3/NG) by simply annealing the mixture of melamine, iron (II) phthalocyanine (FePc) and Fe2O3. The effects of the pyrolysis temperature and the molar ratio of FePc to melamine were critically examined in the controls. Remarkably, the Fe7C3/NG obtained at 800 °C (i.e. Fe7C3/NG-800) manifested the forward shifts in the onset potential (0.98 V) and half-wave potential (0.85 V) with respective to commercial Pt/C (50wt%) in 0.1 M KOH, coupled with the great enhancement in the durability (still remained 92.11% of its initial current density even after 40,000 s) and strong methanol tolerance. This research presents a promising strategy for developing Pt-free non-precious efficient ORR electrocatalysts in fuel cells.