Highly Active Trimetallic NiFeCr Layered Double Hydroxide Electrocatalysts for Oxygen Evolution Reaction,Advanced Energy Materials

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Highly Active Trimetallic NiFeCr Layered Double Hydroxide Electrocatalysts for Oxygen Evolution Reaction
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2018-02-01 , DOI: 10.1002/aenm.201703189
Yang Yang _{1,

2} , Lianna Dang ₁ , Melinda J. Shearer ₁ , Hongyuan Sheng ₁ , Wenjie Li ₁ , Jie Chen _{1,

3} , Peng Xiao ₂ , Yunhuai Zhang ₂ , Robert J. Hamers ₁ , Song Jin ₁

Affiliation

The development of efficient and robust earth‐abundant electrocatalysts for the oxygen evolution reaction (OER) is an ongoing challenge. Here, a novel and stable trimetallic NiFeCr layered double hydroxide (LDH) electrocatalyst for improving OER kinetics is rationally designed and synthesized. Electrochemical testing of a series of trimetallic NiFeCr LDH materials at similar catalyst loading and electrochemical surface area shows that the molar ratio Ni:Fe:Cr = 6:2:1 exhibits the best intrinsic OER catalytic activity compared to other NiFeCr LDH compositions. Furthermore, these nanostructures are directly grown on conductive carbon paper for a high surface area 3D electrode that can achieve a catalytic current density of 25 mA cm⁻² at an overpotential as low as 225 mV and a small Tafel slope of 69 mV dec⁻¹ in alkaline electrolyte. The optimized NiFeCr catalyst is stable under OER conditions and X‐ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and elemental analysis confirm the stability of trimetallic NiFeCr LDH after electrochemical testing. Due to the synergistic interactions among the metal centers, trimetallic NiFeCr LDH is significantly more active than NiFe LDH and among the most active OER catalysts to date. This work also presents general strategies to design more efficient metal oxide/hydroxide OER electrocatalysts.

中文翻译：

高活性三金属NiFeCr层状双氢氧化物氧分解反应电催化剂

开发用于氧释放反应（OER）的高效，耐用的富地球电催化剂是一项持续的挑战。在此，合理地设计和合成了一种新颖稳定的三金属NiFeCr层状双氢氧化物（LDH）电催化剂，以改善OER动力学。在相似的催化剂负载和电化学表面积下，一系列三金属NiFeCr LDH材料的电化学测试表明，与其他NiFeCr LDH组成相比，Ni：Fe：Cr = 6：2：1的摩尔比表现出最佳的固有OER催化活性。此外，这些纳米结构直接生长在用于高表面积3D电极的导电碳纸上，该电极可在低至225 mV的过电势和69 mV dec的小Tafel斜率下实现25 mA cm ^-2的催化电流密度^-1在碱性电解液中。经过优化的NiFeCr催化剂在OER条件下是稳定的，X射线光电子能谱，电子顺磁共振谱和元素分析证实了电化学测试后三金属NiFeCr LDH的稳定性。由于金属中心之间的协同相互作用，三金属NiFeCr LDH的活性明显高于NiFe LDH，并且是迄今为止活性最强的OER催化剂。这项工作还提出了设计更有效的金属氧化物/氢氧化物OER电催化剂的一般策略。

更新日期：2018-02-01

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