Jae-Hee Jeon , Ji-Eun Kim , Tae-Hyun Kim , Chu-Sik Park , Kwangjin Jung , Jaekyung Yoon , Joonho Kim , Young-Ho Kim , Kyoung-Soo Kang
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引用次数: 0
摘要
本研究通过在 NiO 上电沉积 Ni-Fe 制备了一种具有分层结构的 OER 电催化剂。所制备的电催化剂具有高活性和稳定性。此外,还通过改变镀液中金属(镍和铁)的浓度以及镍铁比,研究了镍铁/氧化镍电极的 OER 特性。随着电镀液浓度的降低,由于局部 pH 值的升高,镍铁层双氢氧化物显著形成。在电流密度为 10 mA/cm2 时,过电位为 245 mV,Tafel 斜坡为 27.6 mV dec-1。调整镀液中的镍铁合金比例后,当电极中的铁含量增加到约 20.9 at.% 时,OER 活性增加;当铁含量超过这一比例时,活性逐渐降低。由于γ-NiOOH 结构中的 Fe3+ 取代作用,Fe 可抑制 Ni 氧化并充当活性位点,从而提高了 OER 活性。然而,当 Fe 含量为 >29 at.% 时,非活性相 γ-FeOOH 显著增加,OER 活性降低。
Enhanced oxygen evolution reaction in hierarchical NiFe/NiO electrocatalysts: Effects of electrodeposition condition on electrode
This study fabricated an OER electrocatalyst with a hierarchical structure by electrodepositing Ni-Fe on NiO. The prepared electrocatalyst exhibited high activity and stability. Furthermore, the OER characteristics of the NiFe/NiO electrode were investigated by changing the metal (Ni and Fe) concentration and Ni:Fe ratio in the plating bath. As the plating bath concentration decreased, NiFe-layered double hydroxide was prominently formed due to an increase in local pH. The electrode obtained using a relatively low plating bath concentration of 130 mM demonstrated high activity with an overpotential of 245 mV and Tafel slope of 27.6 mV dec-1 at a current density of 10 mA/cm2. When the Ni:Fe ratio in the plating bath was adjusted, OER activity increased as the Fe content of the electrode increased to approximately 20.9 at.%, and as the Fe content increased beyond that, the activity gradually decreased. Fe inhibits Ni oxidation and acts as an active site owing to Fe3+ substitution in the γ-NiOOH structure, resulting in increased OER activity. However, when the Fe content was > 29 at.%, the inactive phase γ-FeOOH predominantly grew and the OER activity decreased.
期刊介绍:
Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.