A catheter for ablating tissue is provided. The catheter comprises an elongated generally-tubular catheter body having proximal and distal ends. An electrode assembly is provided at the distal end of the catheter body. The electrode assembly including a porous electrode arrangement that is generally transverse to the catheter body. The porous electrode arrangement comprises one or more electrodes electrically connected to a suitable energy source and a porous sleeve mounted in surrounding relation to the one or more electrodes and defining an open space between the porous sleeve and the one more electrodes. One or more irrigation openings fluidly connect the open space to a lumen extending through the catheter through which fluid can pass. In use, fluid passes through the lumen in the catheter, through the one or more irrigation openings, into the open space and through the porous sleeve.