Although the results have shown that qualitative predictions of trends in adsorption energies will not be heavily affected by the choice of dc-XC functional, it is clear that one will usually strive to employ an approach that gives reasonably "accurate" absolute values. In this context, the term "accurate" is not meant to reflect the "chemical accuracy" that is often the goal in highlevel benchmarking studies, but to reflect a performance that is largely free from systematic over-or underestimations. Compared to gas-phase adsorption, where sophisticated approaches to derive adsorption energies from experimentally measured adsorption enthalpies have been developed, the situation is more complex for species adsorbed from the liquid phase, and a direct comparison to experimental values does not, at present, appear as a feasible strategy to gauge the performance of DFT approaches. To obtain higher-level reference values, DLPNO-CCSD(T) calculations were carried out for a few cluster models.