Acid-Corrosion-Induced Hollow-Structured NiFe-Layered Double Hydroxide Electrocatalysts for Efficient Water Oxidation
Acid-Corrosion-Induced Hollow-Structured NiFe-Layered Double Hydroxide Electrocatalysts for Efficient Water Oxidation
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用于高效水氧化的酸腐蚀中空结构 NiFe 层状双氢氧化物电催化剂
DOI：
10.1021/acsaem.1c01314
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发表时间：
2021-08
影响因子：
6.4
通讯作者：
Wang Baoguo
中科院分区：
文献类型：
--
作者：
Wang Peican;Lin Yuqun;Xu Qin;Xu Ziang;Wan Lei;Xia Yingchun;Wang Baoguo
高活性、高性价比、稳定的析氧反应（OER）电催化剂在电化学水分解中至关重要。虽然活性组分直接生长在基底上是提高催化剂活性的有效策略，但活性组分与基底之间的弱粘附性极大地阻碍了它们在具有优异性能的情况下的长期使用。本文采用酸腐蚀诱导的方法，在NiFe泡沫（NiFe LDH@NiFe）上制备了NiFe-层状双氢氧化物（NiFe LDH）的三维中空结构。通过基于自体NiFe泡沫的工艺获得自支撑电极，其中电极/气体/电解质界面和电催化剂/基底界面被精心设计。值得注意的是，NiFe LDH@NiFe仅需要201 mV的超低过电位，就能在1 M KOH电解液中提供10 mA cm-2的电流密度，从而实现OER，沿着具有极好的稳定性。其高催化活性的原因是纳米片阵列与基底之间的紧密连接、上级的本征活性以及快速的电子转移。更重要的是，NiFe LDH@NiFe优异的亲水性和疏氧性能够显著改善电解质的渗透，快速释放氧气泡，并显著增强电荷转移。因此，所获得的NiFe LDH@NiFe具有用于电催化应用的前景。最后，对NiFe LDH@NiFe的生长机理进行了详细的研究和讨论。
Highly active, cost-effective, and stable electrocatalyst for oxygen evolution reaction (OER) is of primary importance in electrochemical water splitting. Although the direct growth of active components on the substrate is an effective strategy to enhance the catalytic activity, the weak adhesion between active material and substrate tremendously hampers their long-term utilization with excellent performance. Herein, a three-dimensional (3D) hollow structure of NiFe-layered double hydroxide (NiFe LDH) on NiFe foam (NiFe LDH@NiFe) is designed via acid-corrosion-induced strategy. The self-supported electrode was obtained through a process based on an autologous NiFe foam, in which the electrode/gas/electrolyte interface and electrocatalyst/substrate interface are delicately engineered. Remarkably, the NiFe LDH@NiFe only needs an ultralow overpotential of 201 mV to deliver a current density of 10 mA cm–2for OER in 1 M KOH electrolyte, along with superb stability. The high catalytic activity is attributed to the intimate connection between the nanosheet arrays and substrate, superior intrinsic activity, and fast electron transfer. More importantly, the excellent hydrophilicity and aerophobicity of NiFe LDH@NiFe enables significantly improved infiltration of electrolytes, quick release of oxygen bubbles, and remarkably enhanced charge transfer. Thus, the obtained NiFe LDH@NiFe holds promise for electrocatalytic applications. Finally, the growth mechanism of NiFe LDH@NiFe is investigated and discussed in detail.
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影响因子：
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