The State University of New York

Gastech, Inc.

Xiao Xu

Israel Cabasso

Youxin Yuan

An electrochemical gas sensor comprising a sensing electrode, a counter electrode, an electrolyte reservoir, an upwardly extending projection disposed within the reservoir that supports the counter electrode, and a wick interposed between, and in contact with, the sensing and counter electrodes. The wick includes an overhang partially disposed in the electrolyte reservoir. The sensor may further include a reference electrode coplanar with and adjacent to the counter electrode. The sensor is accurate and sensitive, while also compact, reliable, and relatively simple to manufacture.

Electrochemical gas sensor

All electrocatalytic gas diffusion electrode for fuel cells and a process for its preparation is disclosed. The electrode comprises an anistropic gas diffusion layer and a catalytic layer. The gas diffusion layer is made of a porous carbon matrix through which carbon particles and poly(vinylidene) fluoride are distributed so that the matrix is homogeneously porous in a direction lateral to gas flow and asymmetrically porous to gases in the direction of the gas flow. The porosity of the gas diffusion layer decreases in the direction of gas flow. The catalytic layer is made of a coagulated ink suspension containing catalytic carbon particles and a thermoplastic polymer selected from polyethersulfone, poly(vinylidene fluoride) and sulfonated polysulfone and covers the small pore surface of the gas diffusion layer. The gas diffusion layer has a thickness between 50 .mu.m and 300 .mu.m. The catalytic layer has thickness between 7 .mu.m and 50 .mu.m and a metal catalyst loading between 0.2 mg/cm.sup.2 and 0.5 mg/cm.sup.2.

Growing community of inventors

Fremont, CA, United States of America

Xiao Xu