Electrochemical water splitting offers a simple route to make hydrogen and it is of great importance but still remains a big challenge to develop cost-effective electrocatalysts for catalyzing the hydrogen evolution reaction over the whole pH range. In this work, molybdenum sulfide nanosheet arrays are hydrothermally grown on Ti plate as an integrated 3D hydrogen-evolving cathode. This electrode exhibits high catalytic activity in acidic media, displaying 10 and 100 mA cm(-2) at overpotentials of 108 and 205 mV, respectively, and it operates stably within 55 h of operation. Moreover, this electrode is also capable of efficiently catalyzing the HER under neutral and strongly basic conditions. (C) 2015 Elsevier Ltd. All rights reserved.