Noble-metal-free cobalt hydroxide nanosheets for efficient electrocatalytic oxidation
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RESEARCH ARTICLE
Noble-metal-free cobalt hydroxide nanosheets for efficient electrocatalytic oxidation Jie Lan, Daizong Qi, Jie Song (✉), Peng Liu, Yi Liu, Yun-Xiang Pan (✉) Institute of Nano Biomedicine and Engineering, Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment Instrument, Department of Instrument Science and Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Cobalt hydroxide has been emerging as a promising catalyst for the electrocatalytic oxidation reactions, including the oxygen evolution reaction (OER) and glucose oxidation reaction (GOR). Herein, we prepared cobalt hydroxide nanoparticles (CoHP) and cobalt hydroxide nanosheets (CoHS) on nickel foam. In the electrocatalytic OER, CoHS shows an overpotential of 306 mV at a current density of 10 mA$cm–2. This is enhanced as compared with that of CoHP (367 mV at 10 mA$cm–2). In addition, CoHS also exhibits an improved performance in the electrocatalytic GOR. The improved electrocatalytic performance of CoHS could be due to the higher ability of the two-dimensional nanosheets on CoHS in electron transfer. These results are useful for fabricating efficient catalysts for electrocatalytic oxidation reactions. Keywords electrocatalytic oxidation, cobalt hydroxide, nanosheet, water, glucose
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Introduction
The electrocatalytic oxidation reactions have attracted great attentions in many research fields including energy, environment and biology [1–8]. For example, the oxygen evolution reaction (OER) plays a crucial role in the electrocatalytic water splitting to produce hydrogen, metalair batteries and fuel cells [6,9,10]. Another example, the electrocatalytic glucose oxidation reaction (GOR) is an low-cost but efficient way to detect the level of the glucose in human blood [8,11]. Yet, to date, the electrocatalytic oxidation reaction still suffer from the problems like high Received October 16, 2019; accepted December 23, 2019 E-mails: [email protected] (Song J), [email protected] (Pan Y-X)
overpotentials and sluggish kinetics. Noble-metal-based catalysts (e.g., Ir-based and Ru-based catalysts) show good catalytic performances for the electrocatalytic oxidation reactions. However, the low abundance and high cost make the noble metals unsuitable for wide-ranging commercial applications [12–14]. Recently, cobalt-based materials have emerged as promising materials for fabricating electrocatalysts [6,13,15–17]. The natural abundance, intrinsic high catalytic activity and low production cost make the cobalt-based materials be good alternatives to the noble metals [18–20]. Through a hydrothermal process and phosphorization, Tong et al. [21] prepared highly efficient NiCoP nanosheets catalyst for the electrocatalytic OER. Ji et al. [22] reported a space-confined phosphidation strategy to prepare CoP nanosheets catalyst to achieve highly enhanced electrocatalytic oxidatio
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