  The high-throughput scalable production of cheap, efficient and durable
electrocatalysts that work well at high current densities demanded by industry
is a great challenge for the large-scale implementation of electrochemical
technologies. Here we report the production of a 2D MoS2-based ink-type
electrocatalyst by a scalable top-down exfoliation technique followed by a
simple heat treatment. The catalyst shows a high current density of 1000 mA
cm^-2 at an overpotential of 454 mV for the hydrogen evolution reaction (HER)
without the need of iR correction, as well as good stability over 24 hours.
Using the same method, we have, for the first time, produced a cheap MoS2
mineral-based catalyst and found that it had an excellent performance for
high-current-density HER. Noteworthy, production rate of this MoS2-based
catalyst is one to two orders of magnitude higher than those previously
reported. In addition, the price of the MoS2 mineral is five orders of
magnitude lower than commercial Pt catalysts, making the MoS2 mineral-based
catalyst cheap, and the ink-type catalyst dispersions can be easily integrated
with other technologies for large-scale catalyst electrode preparation. These
advantages indicate the huge potentials of this method and mineral-based cheap
and abundant natural resources as catalysts in the electrochemical
technologies.
