Tuning the morphology of β-Ni(OH) 2 for electrocatalytic urea oxidation Maryam Toufani †1a , Hanka Besic †1 , Wenming Tong *2 and Pau Farràs Costa *3 1 PhD Student, school of Biological and Chemical Sciences and Energy Research Centre, Ryan Institute, University of Galway, University Road, Galway, Ireland, H91 TK33, 2 Dr,school of Biological and Chemical Sciences and Energy Research Centre, Ryan Institute, University of Galway, University Road, Galway, Ireland, H91 TK33, 3 Associate Professor,school of Biological and Chemical Sciences and Energy Research Centre, Ryan Institute, University of Galway, University Road, Galway, Ireland, H91 TK33 Ni(OH) 2 , as a multifunctional material, has found its applications in a great number of research areas. In particular, it is an efficient catalyst for urea oxidation reaction (UOR), which is an important alternative for oxygen evolution reaction in electrocatalytic water splitting. This work investigates the effect of materials morphology on the electrocatalytic UOR performance of β-Ni(OH) 2 , Three different morphologies (nanoflowers, nanocubes, and nanosheets) was prepared via a simple hydrothermal approach. The morphology and structure of the as- prepared samples were carefully examined by scanning electron microscopy, transmission electron microscopy, and powder X-ray diffractionThe UOR performance of β−Ni(OH) 2 was evaluated by means of cyclic voltammetry, linear sweep voltammetry, Tafel analysis, and electrochemical surface area. Nanosheet Ni(OH) 2 electrocatalyst exhibits higher current responses and a lower slope in the Tafel plot. Consequently, due to the exposure of more active sites to the reactants, the Ni(OH) 2 electrode with nanosheet morphology displayed higher electrocatalytic performance during UOR compared to the nanoflower and nanocube samples.
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