Spinel and perovskite with distinctive crystal structures are two of the most popular material families in electrocatalysis, which, however, usually show poor conductivity, causing a negative effect on the charge transfer process during electrochemical reactions. Herein, a highly conductive inverse spinel (Fe₃O₄) and anti‐perovskite (Ni₃FeN) hetero‐structured nanocomposite is reported as a superior oxygen evolution electrocatalyst, which can be facilely prepared based on a one‐pot synthesis strategy. Thanks to the strong hybridization between Ni/Fe 3d and N 2p orbitals, the Ni₃FeN is easily transformed into NiFe (oxy)hydroxide as the real active species during the oxygen evolution reaction (OER) process, while the Fe₃O₄ component with low O‐p band center relative to Fermi level is structurally stable. As a result, both high surface reactivity and bulk electronic transport ability are reached. By directly growing Fe₃O₄/Ni₃FeN heterostructure on freestanding carbon fiber paper and testing based on the three‐electrode configuration, it requires only 160 mV overpotential to deliver a current density of 30 mA cm⁻² for OER. Also, negligible performance decay is observed within a prolonged test period of 100 h. This work sheds light on the rational design of novel heterostructure materials for electrocatalysis.

中文翻译：

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自组装的异结构反尖晶石和抗钙钛矿纳米复合材料，用于超快水氧化。

具有独特晶体结构的尖晶石和钙钛矿是电催化中最受欢迎的两个材料家族，然而，它们通常显示出较差的电导率，从而对电化学反应期间的电荷转移过程产生负面影响。在本文中，据报道，高导电性的尖晶石反型（Fe ₃ O ₄）和抗钙钛矿型（Ni ₃ FeN）杂化纳米复合材料是一种优异的析氧电催化剂，可以基于单罐合成策略轻松制备。由于Ni / Fe 3d和N 2p轨道之间的强杂交，Ni ₃ FeN在氧析出反应（OER）过程中很容易转变为NiFe（氧）氢氧化物作为真正的活性物种，而Fe ₃相对于费米能级的低O-p带中心的O ₄组分在结构上稳定。结果，达到了高表面反应性和体电子传输能力。通过在独立碳纤维纸上直接生长Fe ₃ O ₄ / Ni ₃ FeN异质结构并基于三电极配置进行测试，仅需要160 mV的超电势即可为OER输送30 mA cm ^-2的电流密度。同样，在延长的100小时测试时间内观察到的性能衰减可忽略不计。这项工作为新型的电催化异质结构材料的合理设计提供了启示。