Hameed Arslan, Zulfiqar Faiza, Iqbal Waheed, Ali Hassan, Ahmad Shah Syed Shoaib, Nadeem Muhammad Arif
Department of Chemistry, Quaid-i-Azam University Islamabad 45320 Pakistan
Department of Chemistry, School of Natural Sciences, National University of Science and Technology Islamabad 44000 Pakistan
RSC Adv. 2022 Oct 11;12(45):28954-28960. doi: 10.1039/d2ra05036f.
Layered double hydroxides (LDH) are potential electrocatalysts to address the sluggish oxygen evolution reaction (OER) of water splitting. In this work, copper oxide (CuO/CuO) nanoparticles are integrated with cobalt-manganese layered double hydroxide (CoMn-LDH) to enhance their performance towards OER. The catalyst is synthesized by growing CoMn-LDH nanosheets in the presence of CuO/CuO nanoparticles that were obtained by the calcination of the copper containing metal-organic framework (HKUST-1). The synthesized CoMn-LDH@CuO/CuO electrocatalyst shows excellent activity towards OER with an overpotential of 297 mV at a catalytic current density of 10 mA cm and have a Tafel slope value of 89 mV dec. Moreover, a slight decrease in the performance parameters is observed until the 15 h of continuous operation. We propose that the conductive strength of CuO/CuO and its synergistic effect with the CoMn-LDH are responsible for the improved OER performance of the desired electrocatalyst.
层状双氢氧化物（LDH）是解决水分解中缓慢析氧反应（OER）的潜在电催化剂。在这项工作中，氧化铜（CuO/CuO）纳米颗粒与钴锰层状双氢氧化物（CoMn-LDH）结合，以提高它们对OER的性能。该催化剂是通过在由含铜金属有机框架（HKUST-1）煅烧得到的CuO/CuO纳米颗粒存在下生长CoMn-LDH纳米片来合成的。合成的CoMn-LDH@CuO/CuO电催化剂对OER表现出优异的活性，在催化电流密度为10 mA cm时过电位为297 mV，塔菲尔斜率值为89 mV dec。此外，在连续运行15小时之前，性能参数略有下降。我们认为CuO/CuO的导电强度及其与CoMn-LDH的协同效应是所需电催化剂OER性能提高的原因。
