This work reports the fabrication of a Co3O4/CoS2 heterostructure using a facile and
low-temperature
hydrothermal technique for overall hydrazine-assisted water splitting
(OHzWS). The structural analyses using physical characterization techniques
confirm the coexistence of Co3O4 and CoS2 phases with a significant interfacial interaction. The developed
Co3O4/CoS2 heterostructure shows
superior electrochemical HzOR performance compared to individual Co3O4 and CoS2 phases. It could deliver
a current densities of 10 and 100 mA/cm2 at 240 and 340
mV, respectively. In addition, it delivers a high current density
of 300 mA/cm2 @ 480 mV without using any electrochemically
active and expensive metallic substrate such as nickel foam, cobalt
foam, etc. Furthermore, overall hydrazine-assisted water splitting
by the Co3O4/CoS2 heterostructure
required a low cell potential of 0.49 V, which is 1.35 V less than
that for the overall conventional water splitting (10 mA/cm2 @ 1.84 V). Additionally, the heterostructured catalyst is electrochemically
stable for 3000 continuous cycles.
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