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Efficient organic photovoltaic (OPV) materials are constructed by attaching completely planar, symmetric end‐groups to donor‐acceptor electroactive small molecules. Appending C2‐pyrene as the small molecule end‐group to a diketopyrrolopyrrole core leads to materials with a tight, aligned crystal packing and favorable morphology dictated by π–π interactions, resulting in high power conversion efficiencies...
We demonstrate that the power output from a PEM fuel cell can be directly regulated by limiting the hydrogen feed to the fuel cell. Regulation is accomplished by varying the internal resistance of the membrane–electrode assembly in a self-draining fuel cell with the effluents connected to water reservoirs. The fuel cell functionally operates as a dead-end design where no gas flows out of the cell...
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