Foam–like Co9S8/Ni3S2 heterostructure nanowire arrays for efficient bifunctional overall water–splitting

Foam–like nanowire arrays composed of the Co9S8/Ni3S2 heterostructure possess huge electrochemical surface areas and rich lattice defects. The value of double–layer capacitance for Co9S8/Ni3S2 is detected to be 81.4 m F·cm−2, which is four times more than the precursor (NixCo1-x(CO3)0.5OH). This enhancement greatly produces a large number of catalytic reaction sites for contacting with electrolyte ions. The method of in–situ vulcanization growth...