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New insight into effect of potential on degradation of Fe-N-C catalyst for ORR
Frontiers in Energy ( IF 2.9 ) Pub Date : 2021-03-08 , DOI: 10.1007/s11708-021-0727-2
Yanyan Gao , Ming Hou , Manman Qi , Liang He , Haiping Chen , Wenzhe Luo , Zhigang Shao

In recent years, Fe-N-C catalyst is particularly attractive due to its high oxygen reduction reaction (ORR) activity and low cost for proton exchange membrane fuel cells (PEMFCs). However, the durability problems still pose challenge to the application of Fe-N-C catalyst. Although considerable work has been done to investigate the degradation mechanisms of Fe-N-C catalyst, most of them are simply focused on the active-site decay, the carbon oxidation, and the demetalation problems. In fact, the 2e pathway in the ORR process of Fe-N-C catalyst would result in the formation of H2O2, which is proved to be a key degradation source. In this paper, a new insight into the effect of potential on degradation of Fe-N-C catalyst was provided by quantifying the H2O2 intermediate. In this case, stability tests were conducted by the potential-static method in O2 saturated 0.1 mol/L HClO4. During the tests, H2O2 was quantified by rotating ring disk electrode (RRDE). The results show that compared with the loading voltage of 0.4 V, 0.8 V, and 1.0 V, the catalysts being kept at 0.6 V exhibit a highest H2O2 yield. It is found that it is the combined effect of electrochemical oxidation and chemical oxidation (by aggressive radicals like H2O2/radicals) that triggered the highest H2O2 release rate, with the latter as the major cause.



中文翻译:

电位对ORR的Fe-NC催化剂降解的影响的新见解

近年来,Fe-NC催化剂由于其高的氧还原反应(ORR)活性和质子交换膜燃料电池(PEMFC)的低成本而特别吸引人。然而,耐久性问题仍然对Fe-NC催化剂的应用提出挑战。尽管已经进行了大量工作来研究Fe-NC催化剂的降解机理,但其中大多数仅集中于活性部位的衰变,碳氧化和脱金属问题。事实上,2E -通路中的Fe-NC催化剂的ORR过程将导致形成为h 2 ö 2,其被证明是一个关键的降解源。本文通过对H进行定量分析,提供了对电势对Fe-NC催化剂降解的影响的新见解。2 O 2中间体。在这种情况下,通过电位-静电法在O 2饱和的0.1 mol / L HClO 4中进行稳定性测试。在测试过程中,通过旋转环形盘电极(RRDE)对H 2 O 2进行定量。结果表明,与0.4 V,0.8 V和1.0 V的加载电压相比,保持在0.6 V的催化剂具有最高的H 2 O 2产率。发现是电化学氧化和化学氧化(通过像H 2 O 2 /自由基这样的侵蚀性自由基)的联合作用触发了最高的H 2 O 2。 释放率,后者是主要原因。

更新日期:2021-03-01
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