Industrial femtosecond laser induced construction of micro/nano wettability electrodes with outstanding hydrogen evolution performance

To realize an efficient hydrogen production in industrial water electrolysis, the development of catalytic systems with excellent hydrogen evolution performance, cost-effectiveness, high mechanical strength, and an easily applicable manufacturing process is essential. This paper describes a novel electrode preparation method, which allows constructing a micro-/nano-structured electrode surface composed of an NiO/Ni catalytic material using an industrial femtosecond laser in one step. This electrode combines a fast charge transfer caused by the synergistic effect of Ni and NiO and a rapid dynamic cycle of bubble desorption and water replenishment induced by a high wettability to obtain an excellent and efficient hydrogen evolution performance. Electrochemical tests show that a very low overpotential of 57 mV is sufficient to deliver a current of 10 mA cm-2 in alkaline environment, and the activity is maintained for more than 144 h without decay, demonstrating the high stability of the system. Benefiting from the advantages of the industrial laser microfabrication technology, this work paves the way for the design and development of more efficient industrial electrocatalysts.