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Carbon adsorption on the CuNi alloy surfaces. a) The most favorable adsorption sites of a single C atom on CuNi alloy surfaces with Ni composition of 0%, 12.5%, 25%, 50%, 75%, and 100%, respectively (Cu, orange; Ni, blue; C, gray). b) Formation energies of the adsorbed C atom versus to the Ni composition of CuNi alloys.
