Qingyun Lv , Weiwei Zhang , Zhipeng Long , Jiantao Wang , Xingli Zou , Wei Ren , Long Hou , Xionggang Lu , Yufeng Zhao , Xing Yu , Xi Li
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引用次数: 0
摘要
镍铁基(氧)氢氧化物是氧进化反应(OER)中最高效的电催化剂之一。然而,OER 过程中铁的大量泄漏导致其稳定性不尽人意。本文采用大电流(1.5 A cm-2)电静电重构法制备了具有固定铁位点和外露高指数晶面(HIF)的 FeOOH@NiOOH(eFNOL)。与低指数晶面的 FeNiOOH 相比,相分离的 FeOOH@NiOOH 显示出更高的铁结合能,HIF 显著提高了 FeOOH 的催化活性。优化后的 eFNOL 催化剂显示出 234 和 272 mV 的超低过电位,产生的可观电流密度分别为 100 和 500 mA cm-2,塔菲尔斜率较小,为 35.2 mV dec-1。此外,由于铁位点的稳定,该催化剂在 500 mA cm-2 电流下 100 小时内的稳定性惊人,衰减率仅为 1.5%,优于最近报道的大多数镍铁基 OER 催化剂。这项研究为通过大电流电化学重构开发高活性、高稳定性催化剂提供了一种有效的策略。
Large-current polarization-engineered FeOOH@NiOOH electrocatalyst with stable Fe sites for large-current oxygen evolution reaction
NiFe-based (oxy)hydroxides are among the most efficient electrocatalysts for the oxygen evolution reaction (OER). However, significant Fe leakage during the OER results in unsatisfactory stability. Herein, a large-current (1.5 A cm–2) galvanostatic reconstruction was used to fabricate FeOOH@NiOOH (eFNOL) with both fixed Fe sites and exposed high-index crystal facets (HIFs). Compared to FeNiOOH with low-index crystal facets, the phase-separated FeOOH@NiOOH showed a higher binding energy towards Fe, and the HIFs significantly improved the catalytic activity of FeOOH. The optimized eFNOL catalyst exhibits ultralow overpotentials of 234 and 272 mV, yielding substantial current densities of 100 and 500 mA cm–2, respectively, with a small Tafel slope of 35.2 mV dec–1. Moreover, due to the stabilized Fe sites, its striking stability over 100 h at 500 mA cm–2 with 1.5% decay outperforms most NiFe-based OER catalysts reported recently. This study provides an effective strategy for developing highly active and stable catalysts via large-current electrochemical reconstruction.
期刊介绍:
The journal covers a broad scope, encompassing new trends in catalysis for applications in energy production, environmental protection, and the preparation of materials, petroleum chemicals, and fine chemicals. It explores the scientific foundation for preparing and activating catalysts of commercial interest, emphasizing representative models.The focus includes spectroscopic methods for structural characterization, especially in situ techniques, as well as new theoretical methods with practical impact in catalysis and catalytic reactions.The journal delves into the relationship between homogeneous and heterogeneous catalysis and includes theoretical studies on the structure and reactivity of catalysts.Additionally, contributions on photocatalysis, biocatalysis, surface science, and catalysis-related chemical kinetics are welcomed.