In Situ Vertical Growth of Fe–Ni Layered Double-Hydroxide Arrays on Fe–Ni Alloy Foil: Interfacial Layer Enhanced Electrocatalyst with Small Overpotential for Oxygen Evolution Reaction,ACS Energy Letters

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In Situ Vertical Growth of Fe–Ni Layered Double-Hydroxide Arrays on Fe–Ni Alloy Foil: Interfacial Layer Enhanced Electrocatalyst with Small Overpotential for Oxygen Evolution Reaction
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-09-10 00:00:00 , DOI: 10.1021/acsenergylett.8b01466
Qian Xiang ₁ , Fan Li ₁ , Wenlong Chen ₁ , Yanling Ma ₁ , Yi Wu ₁ , Xin Gu ₁ , Yong Qin ₁ , Peng Tao ₁ , Chengyi Song ₁ , Wen Shang ₁ , Hong Zhu _{1,

2,

3} , Tao Deng _{1,

4} , Jianbo Wu _{1,

3,

4}

Affiliation

Layer double hydroxide (LDH) has been widely applied to electrocatalysis, especially toward the oxygen evolution reaction (OER), owing to its flexible layered structure and multifunctionality. Herein, FeNi LDH nanosheet arrays are directly synthesized on various metal foils by a facile hydrothermal method. Compared with single Fe or Ni substrates, the obtained FeNi LDH/FeNi foil exhibited an ultrasmall onset overpotential of ∼90 mV, high catalytic activity (overpotential of 130 mV @ 10 mA/cm²), and durable stability in 0.1 M KOH electrolyte. We also demonstrate, by utilizing density functional theory calculations, that the growth of the hydroxide interfacial layer between LDH and FeNi foil makes the LDH possess more favorable adsorption to the OH intermediate during OER than the pure LDH. This reveals that the vertical FeNi LDH arrays on the FeNi alloy substrate are prone to be an efficient catalyst toward OER.

中文翻译：

Fe-Ni合金箔上Fe-Ni层状双氢氧化物阵列的原位垂直生长：界面层增强的电催化剂，具有过高的氧析出反应电势

层状双氢氧化物（LDH）由于其灵活的层状结构和多功能性，已广泛应用于电催化，特别是在氧释放反应（OER）中。在此，通过简便的水热法在各种金属箔上直接合成FeNi LDH纳米片阵列。与单一的Fe或Ni衬底相比，所获得的FeNi LDH / FeNi箔表现出约90 mV的超小起始超电势，高催化活性（10 mA / cm ^2时130 mV的超电势））和在0.1 M KOH电解液中的持久稳定性。我们还通过利用密度泛函理论计算证明，LDH和FeNi箔之间的氢氧化物界面层的生长使LDH在OER期间比纯LDH对OH中间体具有更有利的吸附。这表明，FeNi合金基体上的垂直FeNi LDH阵列易于成为OER的有效催化剂。

更新日期：2018-09-10

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