Ilaiyaraja Periyaiah , M. Praveen Kumar , Natesan Kumaresan , R.V. Mangalaraja , Francisco V. Herrera Diaz , Saeed Farhang Sahlevani , S. Sasikala , G. Murugadoss , Ilaiyaraja Perumal , Moorthy Sasikumar
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引用次数: 0
Abstract
The rapid development of superior, highly stable, alkaline-medium-compatible, and nonprecious earth-abundant bifunctional electrocatalysts has garnered significant research interest. This interest aims to replace the costliest noble metals (Pt, Ir/IrO2, and Ru/RuO2) in renewable and green energy technologies for overall water splitting. However, there are still important limitations, such as lower stability and higher energy consumption. In this work, we report the synthesis of Cu-Co metal-organic frameworks (MOFs) as a bifunctional electrocatalyst using a simple chemical precipitation technique. Especially, when 11.5 mM of Co is combined with Cu MOF, it exhibits excellent bifunctional activity for overall water splitting with a lower overpotential of 0.21 V (OER) and -0.71 V (HER) at a current density of 10 mA cm−2, which exhibits nearly several times more enhancement than that of pristine Cu and Co MOFs in a 1 M KOH electrolyte solution. The Tafel slope value of 130 mV/dec and the lower charge transfer resistance, along with relatively high stability for up to 12 h at the onset potential of OER and HER, are observed for the 11.5 mM Cu-Co MOF electrocatalyst. The present results open an alternative pathway for developing a novel design of highly efficient and scalable bifunctional electrocatalysts for overall water splitting.
性能优越、高度稳定、碱介质兼容、非贵重土富集的双功能电催化剂的快速发展引起了人们的极大研究兴趣。这种兴趣旨在取代可再生能源和绿色能源技术中成本最高的贵金属(铂、Ir/IrO2 和 Ru/RuO2),实现整体水分离。然而,该技术仍存在一些重要的局限性,如稳定性较差和能耗较高。在这项工作中,我们利用简单的化学沉淀技术合成了 Cu-Co 金属有机框架 (MOF),作为一种双功能电催化剂。特别是当 11.5 mM 的 Co 与 Cu MOF 相结合时,在 10 mA cm-2 的电流密度下,Cu-Co MOFs 的过电位为 0.21 V(OER),而 HER 为-0.71 V(HER)。11.5 mM Cu-Co MOF 电催化剂的塔菲尔斜率值为 130 mV/dec,电荷转移电阻较低,而且在 OER 和 HER 的起始电位下具有长达 12 小时的相对高稳定性。本研究结果为开发新型高效、可扩展的双功能电催化剂开辟了另一条途径,可用于整体水分离。