Self-assembled acicular CuCo-MOF for enhancing oxygen evolution reaction
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ORIGINAL PAPER
Self-assembled acicular CuCo-MOF for enhancing oxygen evolution reaction Jie Zhang 1 & Chen Zhang 1 & Xiaoxiao Duo 1 & Zhongxiang Liu 1 & Chenyang Liu 1 & Linyang Guo 1 & Aijuan Xie 1 Shiping Luo 1
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Received: 15 February 2020 / Revised: 29 May 2020 / Accepted: 5 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Metal-organic framework (MOF) materials have a topological structure, which helps the reactants to fully contact the active sites. This structure can effectively increase the number of active sites participating in the reaction and enhance their catalytic properties. Therefore, in this work, single metal MOF (Co-MOF), single metal MOF with Cu through electrodeposition (Cu/ Co-MOF), and double metal MOF (CuCo-MOF) in the case of the same ligand and metal ion were prepared by a hydrothermal method and electrodeposition, which were then applied in the electrocatalytic oxygen evolution reaction (OER). A group of electrochemical tests showed that as-prepared CuCo-MOF exhibited lowest Rct value, highest electron transfer capability, and the best catalytic performance among the three catalysts. When the current density was 10 mA cm−2, the overpotential of CuCoMOF was 0.38 V, and the slope of Tafel curve was 118 mV dec−1. Moreover, the CuCo-MOF had larger TOF values and better electrocatalytic property as compared with the other two MOF materials. Therefore, the self-assembled acicular CuCo-MOF material prepared in this work has the advantages of low overpotential, small initial potential, and good stability. Keywords Metal-organic framework . Oxygen evolution reaction . Electrocatalytic property . Overpotential
Introduction How to realize the harmonious coexistence between human and nature, ensuring the sustainable development of the economy is still a global problem [1]. With the rapid development of technology and the increasing demand for energy, fossil fuels are being sharply consumed, and their heavy use has caused a huge damage to human living environments such as global warming, melting glaciers, and rising sea levels. Hydrogen production by electrolyzing water can relieve the above problem. However, the oxygen evolution reaction (OER) in the process of electrolyzing water is slow and requires a high overpotential [2]. Hence, it is imperative to develop effective catalysts for OER. Currently, most of the OER
* Aijuan Xie [email protected] * Shiping Luo [email protected] 1
School of Petrochemical Engineering, Changzhou University, Changzhou 213164, People’s Republic of China
catalysts are precious metal materials, but they cannot be used for large-scale commercial applications due to the shortcomings of precious metal storage [3–5]. Therefore, it is of great practical significance to seek catalysts that can replace precious metals for efficient catalysis [6–12]. Metal-organic framework (MOF) materials have been widely used in drug delivery, gas storage, catalysis, sensing, and other fields because of its characteristics such as large specific surface ar
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