Abstract: An exposed electrode negative air ion device, either stand-alone or mounted in an exposed environment 56 as part of a negative air ion panel system 50. Each device comprises: (a) an electronics module 22, the electronics module 22 including a negative voltage generator 22B; and (b) an exposed electrode 10, the exposed electrode 10 including a mat surface 11 of intertwined individual fibres electrically connected to the negative voltage generator 22B. The mat surface 11 has a minimum mean resistance of RMIN to restrict a maximum capacitive current discharge below a capacitive current discharge detection threshold. The negative voltage generator 22B is configured to generate a negative voltage source 23 from a power supply 21 within a set of electrical parameters. The set of electrical parameters includes a maximum preset negative voltage of VMAX and a maximum operating current, the maximum operating current set below or equal to a direct current detection threshold.

Abstract: The present invention relates to a system for air purification. The system comprises at least a first plant and a second plant, and a voltage pulse device connectable to a power source for generating and transmitting a voltage pulse to the first plant, wherein the second plant is connected to the first plant using at least one voltage pulse transmission unit, and the first plant and the second plant are arranged to form one or more contact areas at a leaf portion. The system may also comprise a plurality of plants mounted on a support structure in accordance with some embodiments. The present invention also relates to a voltage pulse device for use with the system for air purification.

Abstract: The present disclosure relates to an apparatus for producing negative air ions from a plant, comprising: —a power supply module; a voltage pulse module connectable to the power supply module, the power supply module being configured to provide a pre-determined input voltage VIN to the voltage pulse module for generating a negative voltage pulse, and to adjust a reflected voltage pulse from the voltage pulse module; and a stimulating probe connected to the voltage pulse module and configured to transmit the negative voltage pulse to a root portion of the plant. The present disclosure also relates to a power supply device for use with the apparatus for producing negative air ions from a plant.