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For the sake of illustration, let the number of epicatalytically active surface sites on S1 and S2 be and the reaction energy be , typical of hydrogen-bonded dimers like methanol and formic acid . Let the average cycling time be the thermal transit time for room-temperature 100 amu molecules (typical for volatile species) to cross the S1–S2 gap of thickness 10−6 m, that is, . With these, the areal power density for the STG device is estimated to be . This, of course, will be reduced by unavoidable convective, radiative, and conductive backflows.
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Published Online: 2018-06-21