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A facile route to fabricate double atom catalysts with controllable atomic spacing for the r-WGS reaction

Four double atom catalysts (DACs) with controllable interatomic distances were achieved via solventless ball-milling, among which double-atom Ni2/N–C showed good selectivity and superior catalytic activity to single-atom Ni1/N–C for r-WGS reactions. The modular character of the synthesis provides a facile route to construct diverse atomic spacings of homo- and hetero-DACs.