Patent ID: 8613842

Claim:
A sensor for detecting ammonia, ethanol, or combinations thereof, the sensor comprising: a layered electrocatalyst comprising: a carbon support integrated with a conductive metal; at least one first metal plating layer at least partially deposited on the carbon support, wherein the at least one first metal plating layer has a thickness ranging from 10 nanometers to 10 microns, and wherein the at least one first metal plating layer is active to OH adsorption and inactive to the ammonia, ethanol, or combinations thereof; and at least one second metal plating layer at least partially deposited on the carbon support, wherein the at least one second metal plating layer does not completely cover the at least one first metal plating layer and has regions of varying thickness with at least one region having a thickness ranging from 10 nanometers to 10 microns, and wherein the at least one second metal plating layer is active to ammonia, ethanol, or combinations thereof, and detects the ammonia, ethanol, or combinations thereof; and a counter electrode.