Unveiling the Role of Electrocatalysts Activation for Iron-Doped Ni Oxyhydroxide in Enhancing the Catalytic Performance of Oxygen Evolution Reaction

IF 13 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Energy & Environmental Materials Pub Date : 2024-09-09 DOI:10.1002/eem2.12827

Jiyoung Kim, JeongEun Yoo, Kiyoung Lee

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Abstract

Water electrolysis using renewable electricity is a promising strategy for high-purity hydrogen production. To realize the practical application of water electrolysis, an electrocatalyst with high redox properties and low cost is essential for enhancing the sluggish oxygen evolution reaction. Herein, we fabricated Fe-doped nickel oxalate (Fe-NiC₂O₄) directly grown on nickel (Ni) foam as an efficient electrocatalyst for the alkaline oxygen evolution reaction using a facile one-step hydrothermal method. Fe-NiC₂O₄ served as a precursor for obtaining highly active Fe-doped Ni oxyhydroxide (Fe-NiOOH) via in situ electrochemical oxidation. Consequently, 0.75Fe-NiOOH was demonstrated to be the optimal electrocatalyst, exhibiting outstanding oxygen evolution reaction activity with a low overpotential of 220 mV at a current density of 100 mA cm⁻² and a Tafel slope of 20.5 mV dec⁻¹. Furthermore, Fe-NiOOH maintained its oxygen evolution reaction activity without performance decay during long-term electrochemical measurements, owing to the phase transformation from nickel oxyhydroxide (NiOOH) to γ-NiOOH (gamma nickel oxyhydroxide). These performances significantly surpass those of recently reported transition-metal-based electrocatalysts.

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揭示掺铁氢氧化镍的电催化剂活化在提高氧气进化反应催化性能中的作用

利用可再生能源电解水是一种前景广阔的高纯度制氢策略。要实现水电解的实际应用，必须有一种具有高氧化还原特性且成本低廉的电催化剂来增强缓慢的氧进化反应。在此，我们采用简便的一步水热法，在镍泡沫上直接生长出掺杂铁的草酸镍（Fe-NiC2O4），作为碱性氧进化反应的高效电催化剂。以 Fe-NiC2O4 为前驱体，通过原位电化学氧化法获得高活性的掺杂铁的氢氧化镍（Fe-NiOOH）。结果表明，0.75Fe-NiOOH 是最佳的电催化剂，在 100 mA cm-2 的电流密度和 20.5 mV dec-1 的塔菲尔斜率条件下，过电位低至 220 mV，表现出卓越的氧进化反应活性。此外，由于从氢氧化镍（NiOOH）到γ-NiOOH（伽马氢氧化镍）的相变，Fe-NiOOH 在长期电化学测量中保持了氧进化反应活性，而没有出现性能衰减。这些性能大大超过了最近报道的过渡金属基电催化剂。

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来源期刊

Energy & Environmental Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

17.60

自引率

6.00%

发文量

期刊介绍： Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.