Transition group metal catalysts showing atomic dispersion are on the rise as affordable electrocatalysts for the oxygen reduction reaction (ORR) in fuel cell batteries, but their activity in acidic media remains constrained. In this work, we present a new catalyst (Fe₂–S₁N₅/SNC) for the ORR. The active site of catalysis composed of two charge-asymmetric iron atoms can regulate the adsorption energy of intermediate species (OH*) in the ORR, thereby enhancing the kinetics of the ORR. Furthermore, the use of hollow porous carbon spheres as a support for the catalysis enhances substance transport during the ORR. Fe₂–S₁N₅/SNC exhibits remarkable electrochemical activity in the ORR, displaying a remarkably high half-wave potential of 0.829 V vs. RHE, and it also demonstrates impressive stability, as the half-wave potential only decreases by 26 mV after 5000 cycles in a 0.1 M HClO₄ solution. Therefore, this study offers valuable insights into the low-cost metal catalyst design for the ORR, specifically the precise construction of active sites.

中文翻译：

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精确构建空心多孔碳球负载的电荷不对称双原子 Fe 位点以实现高效氧还原


显示出原子分散性的过渡族金属催化剂作为燃料电池中氧还原反应（ORR）的经济型电催化剂正在兴起，但它们在酸性介质中的活性仍然受到限制。在这项工作中，我们提出了一种用于 ORR 的新型催化剂 (Fe ₂ –S ₁ N ₅ /SNC)。由两个电荷不对称铁原子组成的催化活性位点可以调节ORR中中间物种(OH*)的吸附能，从而增强ORR的动力学。此外，使用中空多孔碳球作为催化载体增强了 ORR 过程中的物质传输。 Fe ₂ –S ₁ N ₅ /SNC 在 ORR 中表现出显着的电化学活性，相对于 RHE 表现出 0.829 V 的极高半波电位，它还表现出令人印象深刻的稳定性，在 0.1 M HClO ₄ 溶液中循环 5000 次后，半波电位仅降低 26 mV。因此，这项研究为 ORR 的低成本金属催化剂设计，特别是活性位点的精确构建提供了宝贵的见解。