In this study, we developed a membrane-free
electrochemical
reactor
by directionally regulating the electron storage release of the NiCoP
array electron reservoir, which realized high-efficiency removal of
ammonia and simultaneous hydrogen purification. In the ammonia removal
cell, indirect oxidation based on electrocatalytic chlorine evolution
achieved effective removal of ammonia, while electrons were stored
by the NiCoP array auxiliary electrode in the oxidation state at the
cathode. In the hydrogen production cell, the electrons released from
NiCoP arrays in the reduction state were obtained at the cathode to
produce hydrogen with a purity of nearly 100% and a Faraday efficiency
of 90.8%. The reactor maintained stable operation during 30 cycles
of reversing the position of the two auxiliary electrodes, which was
owing to the excellent circulating electron storage release ability
of NiCoP arrays. Our proof-of-concept reactor provides a new development
idea for energy recovery from wastewater.