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Schematic representation of the possible catalytic mechanism of selective CO2 electroreduction to CH4 over shape- and morphology-controlled {hk0} facets of Au@Cu DTP catalysts, and non-shape controlled, spherical/cuboctahedral Au@Cu reference catalyst NPs, respectively, of comparable size. The {hk0} facets are periodically constituted of n(100) as terrace and one (110) as step, i.e. n (100)(110), while the non-shape controlled spherical/cuboctahedral surface composes of differently orientated facets.

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