  Water electrolysis is promising for industrial hydrogen production to achieve
a sustainable and green hydrogen economy, but the high cost of the technology
limits its market share. Developing efficient yet economic electrocatalysts is
crucial to decrease the cost of electricity and electrolytic cell. Meanwhile,
electrolysis in seawater electrolyte can further reduce feedstock cost. Here we
synthesize a type of electrocatalyst where trace precious metals are strongly
anchored on corrosion-resistive matrix. As an example, the produced Pt/Ni-Mo
electrocatalyst only needs an overpotential of 113 mV to reach an ultrahigh
current density of 2000 mA cm-2 in saline-alkaline electrolyte, standing as the
best performance so far. It shows high activity and long durability in various
electrolytes and under harsh conditions, including strong alkaline and
simulated seawater electrolytes, and under elevated temperatures up to 80
degree Celsius). This electrocatalyst is produced on a large scale at low cost
and shows good performance in a commercial membrane electrode assembly stack,
demonstrating its feasibility for practical water electrolysis
