Abstract: The present disclosure relates to a membrane-free alkaline electrolyzer (MFAEL) system for converting nitrogen (N)-containing waste into ammonia (NH3). The system includes a reaction medium comprising H2O—NaOH—KOH; a pair of electrodes, wherein the electrodes are in contact with the reaction medium; and a power supply operably connected to the electrodes. Also disclosed is a method for converting nitrogen (N)-containing waste into ammonia (NH3). This method involves introducing nitrogen (N)-containing waste into a membrane-free alkaline electrolyzer (MFAEL) system and applying current between the electrodes to perform oxidative and reductive transformation of the nitrogen (N)-containing waste into ammonia (NH3).

Abstract: The present application relates to a system for removal of nitrate from water. The system includes a first reactor comprising a porous oxide-derived silver electrode (OD-Ag) for electrocatalytic reduction of nitrate (NO3?) to nitrite (NO2?) and a second reactor comprising a Pd-based catalyst for catalytic reduction of nitrite (NO2?). Also disclosed is a method of removing nitrate from water.

Abstract: The present disclosure relates to a system for generating hydrogen (H2) from an aldehyde, where the system comprises an anode comprising a metal-based alloy catalyst, a cathode comprising Ni2P or Pt/C, and a separator positioned between the anode and the cathode. Also disclosed is a method of producing hydrogen (H2). This method involves providing a system described herein and adding an aldehyde to the system under conditions effective to produce hydrogen (H2) from electrocatalytic oxidative dehydrogenation of the aldehyde at the anode and water reduction at the cathode.

Abstract: The present application relates to a system for removal of nitrate from water. The system includes a first reactor comprising a porous oxide-derived silver electrode (OD-Ag) for electrocatalytic reduction of nitrate (NO3?) to nitrite (NO2?) and a second reactor comprising a Pd-based catalyst for catalytic reduction of nitrite (NO2?). Also disclosed is a method of removing nitrate from water.