Sulfur, Nitrogen and Fluorine Triple‐Doped Metal‐Free Carbon Electrocatalysts for the Oxygen Reduction Reaction,ChemElectroChem

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Sulfur, Nitrogen and Fluorine Triple‐Doped Metal‐Free Carbon Electrocatalysts for the Oxygen Reduction Reaction
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-12-05 , DOI: 10.1002/celc.201801433
Yanlong Lv ₁ , Liu Yang ₁ , Dapeng Cao ₁

Affiliation

Currently, the development of low‐cost catalysts for replacing the precious Pt‐based catalysts for the oxygen reduction reaction (ORR) used in fuel cells is one of the major challenges. The high cost, scarcity and poor durability of the Pt‐based catalysts severely hinder the practical application of fuel cells. Here, we synthesize a S, N, F triple‐doped porous carbon material as efficient metal‐free electrocatalyst for ORR by using cheap superfine polytetrafluoroethylene powder and thiourea as precursors. Results indicate that the as‐synthesized SNF‐Carbon‐1000 under optimized condition not only shows the same onset potential (0.98 V vs. RHE) and half‐wave potential (0.86 V vs. RHE) as commercial 20 % Pt/C in alkaline media, but also a better long‐term stability and higher crossover resistance. The excellent electrocatalytic activity of SNF‐Carbon‐1000 is attributed to the successful doping of heteroatoms of S, N, and F into the carbon matrix and their synergetic effects in charge redistribution caused by N, F‐doping and the polarizability of C−S caused by S‐doping. This work provides a new approach for the synthesis of S, N, and F triple‐doped porous carbons as highly efficient metal‐free electrocatalyst for ORR.

中文翻译：

硫，氮和氟三掺杂无金属碳电极用于氧还原反应

当前，开发低成本催化剂以替代用于燃料电池的氧气还原反应（ORR）的贵重Pt基催化剂是主要挑战之一。铂基催化剂的高成本，稀缺性和耐用性严重阻碍了燃料电池的实际应用。在这里，我们使用廉价的超细聚四氟乙烯粉末和硫脲作为前体，合成了S，N，F三掺杂多孔碳材料，作为ORR的有效无金属电催化剂。结果表明，在优化条件下合成的SNF-Carbon-1000不仅显示出与商用20％Pt / C碱性相同的起始电势（0.98 V vs. RHE）和半波电势（0.86 V vs. RHE）介质，但具有更好的长期稳定性和更高的抗交叉性。SNF-Carbon-1000出色的电催化活性归因于S，N和F杂原子成功地掺杂到碳基质中，以及它们在N，F掺杂和C-S极化作用引起的电荷再分布中的协同作用。由S掺杂引起的。这项工作为合成S，N和F三掺杂多孔碳提供了一种新方法，可作为ORR的高效无金属电催化剂。

更新日期：2018-12-05

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