The electrocatalytic oxygen evolution reaction is a crucial means to support the conversion and storage of the sustainable renewable energy. Low-crystallinity can offer short-range structural ordering and high active site density. In this work, an efficient self-supported oxygen evolution reaction (OER) electrocatalyst, cobalt iron layered double hydroxide (LDH) grown on TiC modified nickel foam (NF) heterostructure anode (CoFe-LDH/TiC/NF) was prepared using electrodeposition. The exceptional electrocatalytic OER performance is ensured by in situ decorating monolayer TiC/NF (s-TiC/NF) with low-crystallinity CoFe nanospheres. By harnessing the low crystallinity, well-chosen composition and reasonable heterostructure, the overpotential of CoFe-LDH/TiC/NF decreases to 246 mV at a current density of 10 mA·cm in alkaline media. After 3000 cyclic voltammograms cycles, the ignorable increase in overpotential of 14 mV suggest the excellent long circular stability. Moreover, an accelerated reaction kinetics is implied by the smaller Tafel slope (28.76 mV·dec) and higher double-layer specific capacitance (2.33 mF·cm), which surpassed the counterparts CoFe-LDH grown on NF (CoFe-LDH/NF) and s-TiC/NF. This work paves a new way to fabricate the low-crystallinity materials for electrocatalysis and energy storage.

中文翻译：

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单层 Ti3C2 电极上自支撑低结晶度 CoFe 层状双氢氧化物纳米球用于析氧反应

电催化析氧反应是支持可持续可再生能源转化和储存的重要手段。低结晶度可以提供短程结构有序性和高活性位点密度。在这项工作中，采用电沉积法制备了一种高效的自支撑析氧反应（OER）电催化剂，即在 TiC 改性泡沫镍（NF）异质结构阳极（CoFe-LDH/TiC/NF）上生长的钴铁层状双氢氧化物（LDH）。用低结晶度 CoFe 纳米球原位装饰单层 TiC/NF (s-TiC/NF) 确保了卓越的电催化 OER 性能。利用低结晶度、精心选择的成分和合理的异质结构，CoFe-LDH/TiC/NF在碱性介质中电流密度为10 mA·cm时过电势降至246 mV。经过 3000 次循环伏安图循环后，过电位增加了 14 mV，可忽略不计，表明具有出色的长循环稳定性。此外，较小的塔菲尔斜率（28.76 mV·dec）和较高的双层比电容（2.33 mF·cm）意味着加速的反应动力学，超过了在 NF 上生长的对应 CoFe-LDH (CoFe-LDH/NF)和 s-TiC/NF。这项工作为制造用于电催化和储能的低结晶度材料开辟了一条新途径。