Energy storage system based on supercapacitors has recently received lots of attention as a complementary technology to batteries to meet the different requirement for energy usage in practice. Herein we demonstrate a new battery-type electrode material for supercapacitors which is based on free-standing amorphous nanoporous nickel-cobalt-phosphide (np-Ni-Co-P) prepared by electrochemical dealloying of Ni-Co-P precursor.
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