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A flow field for an electrochemical cell such as a fuel cell is provided, having micro-flow channels having a width or depth of less than 800 μm, a pitch of less than 800 μm, or a proportion of inter-channel land area of less than 25%. The channels may further comprise micro-features within the chan

A flow field for an electrochemical cell such as a fuel cell is provided, having micro-flow channels having a width or depth of less than 800 μm, a pitch of less than 800 μm, or a proportion of inter-channel land area of less than 25%. The channels may further comprise micro-features within the channels. A flow field plate comprising the subject flow field is provided.

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1. A flow field plate for use in an electrochemical cell comprising a flow field comprising a plurality of channels having a pitch of less than 250 μm. 2. The flow field plate according to claim 1 wherein said channels have a depth of less than 800 μm and a width of less than 250 μm. 3. The flow fie

1. A flow field plate for use in an electrochemical cell comprising a flow field comprising a plurality of channels having a pitch of less than 250 μm. 2. The flow field plate according to claim 1 wherein said channels have a depth of less than 800 μm and a width of less than 250 μm. 3. The flow field plate according to claim 1 having an active area comprising a plurality of channels separated by land areas, wherein the land area is less than 25% of the active area of the flow field. 4. The flow field plate according to claim 3 having a thickness of 1 mm or less. 5. A fuel cell comprising a flow field plate according to claim 3. 6. The fuel cell according to claim 5 which include diffuser-current collector layers of less than 25 μm in thickness. 7. A flow field plate for use in an electrochemical cell comprising a flow field comprising one or more channels having a depth of less than 800 μm and a width of less than 250 μm, said flow field plate having a thickness of 1 mm or less. 8. A fuel cell comprising a flow field plate for use in an electrochemical cell comprising a flow field comprising one or more channels having a depth of less than 3 mm and a width of less than 3 mm wherein said channels additionally comprise microfeatures having a depth of less than 80% of the depth of said channels and having a width of less than 80% of the width of said channels. 9. The fuel cell according to claim 8 which includes diffuser-current collector layers of less than 25 μm in thickness. 10. A diffuser-current collector for use in an electrochemical cell comprising a flow field comprising one or more channels having a depth of less than 3 mm and a width of less than 3 mm wherein said channels additionally comprise microfeatures having a depth of less than 80% of the depth of said channels and having a width of less than 80% of the width of said channels.