Direct comparison of the electrocatalytic oxidation of hydrogen by an enzyme and a platinum catalystElectronic supplementary information (ESI) available: Levich plots at 1% and 10% hydrogen, and a comparison of the effect of carbon monoxide on oxidation currents obtained at platinum and enzyme-modified electrodes. See http://www.rsc.org/suppdata/cc/b2/b201337a/ | doi.page