Co–NiFe layered double hydroxide nanosheets as an efficient electrocatalyst for the electrochemical evolution of oxygen
Co–NiFe layered double hydroxide nanosheets as an efficient electrocatalyst for the electrochemical evolution of oxygen
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Co-NiFe层状双氢氧化物纳米片作为电化学析氧的高效电催化剂
DOI：
10.1016/j.ijhydene.2020.01.241
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发表时间：
2020-03
影响因子：
7.2
通讯作者：
Yuan-Yuan Feng
中科院分区：
文献类型：
--
作者：
Si Si;Hua-Shuai Hu;Liu Ruijie;Zi-Xiang Xu;Chong-Bin Wang;Yuan-Yuan Feng
摘要电化学析氧反应（OER）非贵金属催化剂的开发对水电解过程尤为重要。本文采用水热法合成了二维Co-NiFe层状双氢氧化物（LDH）。在1.0M KOH电解液中，Co-NiFe LDH具有显著的OER活性。在10 mAcm −2的电流密度下，它只需要278 mV的过电位，这是大约。比NiFe LDH催化剂（328 mV）和RuO_2催化剂（298 mV）分别低50 mV和20 mV。此外，Co-NiFe LDH还显示出令人印象深刻的OER长期稳定性。在20 h的耐久性试验中，除形貌和晶体结构稳定外，电位始终保持在1.50V，几乎没有衰减。Co离子的引入改变了LDH的电子结构，使其具有较大的比表面积，有利于传质/电子传递和氧气泡的释放，从而提高了LDH的OER催化性能。这些工作不仅对理解物理和电子结构对OER的作用，而且对设计高性能非贵金属OER电催化剂具有参考价值。
Abstract The development of non-precious metal catalysts for the electrochemical oxygen evolution reaction (OER) is especially important for the water electrolysis process. Herein, a two-dimensional (2D) ultrathin hybrid Co–NiFe layered double hydroxide (LDH) is synthesized via a facile hydrothermal method. In 1.0M KOH electrolyte, Co–NiFe LDH exhibits remarkable activities for OER. At the current density of 10mAcm−2, it only needs an overpotential of 278mV, which is ca. 50mV and 20mV lower than those for NiFe LDH (328mV) and RuO2 catalysts (298mV), respectively. In addition, Co–NiFe LDH also shows impressive long-term stability for OER. Besides the stable morphology and crystal structure, the potential is always kept at 1.50V and shows almost no attenuation during the 20h of durability test. Changes in the electronic structure of LDH due to introduction of Co ions, as well as the large specific surface area facilitate the mass/electron transfer and the oxygen bubbles release, and thus lead to the enhanced catalytic properties for OER. This work can be informative not only for understanding the role of physical and electronic structures on OER but also for designing high-performance non-precious metal OER electrocatalysts.
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影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
Science China Chemistry
影响因子：
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作者：
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