Abstract:
A conductivity sensor comprising: a plurality of boron doped diamond electrodes including a first set of boron doped diamond electrodes having a first surface area and a first electrode spacing and a second set of boron doped diamond electrodes having a second surface area and a second electrode spacing, wherein the first surface area is larger than the second surface area and the second electrode spacing is larger than the first electrode spacing, and wherein the plurality of boron doped diamond electrodes is configured such that in use the conductivity sensor can measure conductivity of a solution at 25°C over at least a range of 1 x 10 -4 Sm -1 to 1 x 10 -1 Sm -1 .
Abstract:
A diamond electrochemical sensor head comprising: a planar sensing surface; a rear surface through which electrical connections are provided; one or more boron doped diamond electrodes which are disposed within trenches in an electrically insulating diamond support matrix at the planar sensing surface, the one or more boron doped diamond electrodes extending partially through the electrically insulating diamond support matrix from the planar sensing surface towards the rear surface of the electrically insulating diamond support matrix; one or more vias extending from the rear surface of the electrically insulating diamond support matrix to a rear surface of the one or more boron doped diamond electrodes within the electrically insulating diamond support matrix; one or more ohmic contacts disposed on the rear surface of the one or more boron doped diamond electrodes within the vias in the electrically insulating diamond support matrix; and one or more electrical connectors extending through the one or more vias to the one or more ohmic contacts disposed on the rear surface of the one or more boron doped diamond electrodes within the vias in the electrically insulating diamond support matrix, wherein the diamond electrochemical sensor head has a thickness from the planar sensing surface in which the one or more boron doped diamond electrodes are disposed to the rear surface of the electrically insulating diamond support matrix in a range 50 micrometres to 1.5millimetres, wherein the one or more boron doped diamond electrodes extend through the electrically insulating diamond support matrix from the planar sensing surface towards the rear surface of the electrically insulating diamond support matrix with a depth in a range 20 micrometres to 500 micrometres, and wherein the one or more ohmic contacts within the one or more vias on the rear surface of the one or more boron doped diamond electrodes each have a resistance which is sufficiently low that an ohmic drop in a faradaic electrochemical experiment is no greater than 10 mV, where the ohmic drop is defined by I x R with I being current and R being total resistance.
Abstract:
An electrochemical cell for treating a fluid, the electrochemical cell comprising: a plurality of electrodes comprising solid sheets of electrically conductive diamond material; and a support structure for supporting the plurality of electrodes with a fluid flow path defined between the plurality of electrodes, wherein the plurality of electrodes includes at least a first set of electrodes at a first point along the fluid flow path and at least a second set of electrodes at a second point along the fluid flow path, wherein the second point lies downstream from the first point along the fluid flow path, wherein the first and second set of electrodes have separate electrical connections, and wherein the electrical connections for each of the first and second sets of electrodes are configured to periodically switch polarity.