Abstract
Due to the large Gibbs free energy of metal telluride for hydrogen generation, tellurium (Te) based materials are rarely reported as catalysts for overall water splitting. Herein, a facile hydrothermal method is used to engineer the stacked flower-like NiTe-NiSe nanosheets, thus nearing the application of transition metal telluride in clean and renewable energy field. Thanks to the hollow flower-shaped catalyst assembled with nanosheets, the active surface area of the optimized electrode material is 20 times larger than that of a single NiTe/NFF or NiSe/NFF, causing low overpotentials for delivering a current density of 10 mA cm−2 (j10) in the hydrogen (HER, 76 mV) and oxygen (OER, 164 mV) evolution processes. The OER activity of NiTe-NiSe/NFF exceeds that of benchmarked RuO2 even at moderate current densities above j115. Based on the results of experiments and DFT calculations, the unexpected high catalytic performance of NiTe-NiSe/NFF is attributed to the formed heterointerfaces and mismatched crystal lattice of NiTe, which effectively optimize the electronic structure through the phase synergy and cause a low adsorption free energy for the reactive intermediates.
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