Abstract
Electrospinning, atomic layer deposition and then coating with enzyme extract yield an electrode, the hydrogen evolution activity of which is tunable.
Highlights
Against the background of our society's need to capture and store renewable energy, molecular hydrogen provides a promising ‘energy currency’ which could be obtained via electrolytic or photoelectrolytic conversion of water and later release energy in fuel cells
In addition to their exorbitant cost, noble metals are plagued by their intolerance to carbon monoxide (CO) and sul des.[1,2,3]
The samples to be tested electrochemically are generated by the following steps: (1) a mat of PAN bers is electrospun onto an Al substrate, annealed; (2) a conformal, electrically conducting layer of TiO2 is generated by atomic layer deposition (ALD) around the PAN bers, annealed; (3) the bers are coated with the enzyme-containing membrane fraction
Summary
An electrochemically functional layer of hydrogenase extract on an electrode of large and tunable specific surface area†. Stefanie Schlicht,a Loıc Assaud,‡a Moritz Hansen,b Markus Licklederer,a Mikhael Bechelany,c Mirjam Pernerb and Julien Bachmann*a. Electrode supports are generated by electrospinning of polyacrylonitrile fibers and subsequent coating of a thin electrically conductive TiO2 layer by atomic layer deposition. The supports are functionalized with a [NiFe]-hydrogenase-containing membrane fraction from Escherichia coli and are characterized structurally and electrochemically. The hydrogenase suspension generates a micron-thick organic film around the fiber mat, which exhibits electrocatalytic activity for hydrogen evolution. The electrode geometric surface area is varied systematically via the electrospinning procedure, which reduces the charge transfer resistance and increases the hydrogen evolution current density to >500 mA cmÀ2 at 0.3 V overpotential
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