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Article Abstract
NiCr-LDH and its partial selenization as NiSe@NiCr-LDH heterostructure is established here as an alkaline water electrolyzer for achieving enhanced overall water splitting efficiency. The hydrothermally synthesized optimized batch of NiSe@NiCr-LDH is thoroughly characterized to elucidate its structure, morphology, and composition. Compared to pristine NiCr-LDH, the batch of NiSe@NiCr-LDH exhibits exceptional alkaline OER and HER activity with low overpotentials of 258 and 85 mV at 10 mA cm, respectively. Besides, NiSe@NiCr-LDH also exhibits excellent acidic HER with an overpotential of only 61 mV at 10 mA cm, indicating that NiSe@NiCr-LDH can operate effectively across a wide pH range. The excellent electrochemical stability of NiSe@NiCr-LDH for 24 h operation is attributed to the formation of a thin layer of SeO during OER operation. The role of selenization and the effect of Cr in the LDH lattice toward enhanced electrocatalytic water splitting is discussed. The outstanding OER and HER performances of NiSe@NiCr-LDH are attributed to the higher electrochemical active surface area, favorable conditions for adsorption of HER/OER intermediates, low charge transfer resistance, and improved conductivity. The practical application of NiSe@NiCr-LDH as a bifunctional electrocatalyst for overall water splitting is reflected from the low cell voltage of 1.548 V at 10 mA cm.
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