Trimetallic Ni-Fe-Co selenides (NiFeCoSex) anchored on carbon fiber cloth (CFC) as efficient electrocatalyst for oxygen evolution reaction (OER) in alkaline medium have been synthesized via a facile two-step method. Firstly, trimetallic Ni-Fe-Co (oxy) hydroxides have been electrodeposited on CFC support (NiFeCo/CFC). Secondly, a solvothermal selenization process has been used to convert NiFeCo/CFC into NiFeCoSex/CFC using N, N-dimethylformamide (DMF) as solvent. The composition and homogeneous distribution of NiFeCoSex/CFC nanoparticles are determined by XRD, XPS, SEM elemental mapping and EDX images. Furthermore, SEM images reveal that NiFeCoSex/CFC has volcano-shaped morphology with rough surface and homogenously distributed on the surface of CFC, which may provide more active sites for OER. The electrochemical measurements show that trimetallic NiFeCoSex/CFC possesses the better electrocatalytic activity with the lower overpotential (150 mV at 10 mA cm(-2)), Tafel slope (85 mV dec(-1)), larger double-layer capacitance (200 mF cm(-2)) and long-term stability than unary or binary metal selenides. The enhanced activity of NiFeCoSex/CFC may be attributed to the trimetallic Ni-Fe-Co selenides and selenides-CFC synergistic interaction. It may offer a promising way to design transition multimetallic selenides supported on conductive support as electrocatalysts for OER. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.