In combination with Brønsted-Evans-Polanyi (BEP) relations which resemble the often linear correlations of activation energies with intermediate adsorption energies, this results in activity curves as a function of a single or two adsorption energies. According to the Sabatier principle 9,10 these take the form of activity volcanos with the best catalyst binding the descriptor intermediate neither too weak nor too strong. This has allowed the highthroughput screening of catalysts and a simplified discussion of experimental findings by a single or two adsorption energies. On the down-side, the scaling relations have made it impossible to independently vary the kinetic barriers of all elementary steps which would be needed to achieve the optimal catalyst. The breaking of scaling relations to go beyond the dimensionality and thus limiting activity shown in the activity volcano has therefore been a key obstacle for the development of more active solid catalysts. In contrast to thermocatalysis, electrocatalysis involves the transfer of electrons and protons which electrochemical potentials needs to be calculated. The Computational Hydrogen Electrode (CHE) approach considers entirely proton-coupled electron transfer (PCET) steps and derives these electrochemical potentials simply from reference to the Standard Hydrogen Electrode (SHE) at which these are in equilibrium with Hydrogen gas. By again considering scaling and BEP relations for PCET steps, the full potential and pH dependence of all intermediate's formation energies is accessible from often only a single or two formation energies. Again, this descriptor-based approach has been used from high-throughput screening using machine learning or interpretation of experimental findings. Due to the origination of this approach from surface science, the formation energies of reaction intermediates even in electrochemistry have been calculated on simple solid surface-vacuum model systems. Recently, this simplistic picture has been increasingly doubted, mostly due to the neglect of the electric double layer. At applied potentials away from the Potential of Zero Charge (PZC), all metal electrodes build up surface charge density which is compensated by counter charge in the solution creating a significant interfacial electric double layer field. This surface charge density and corresponding electric field has been shown to strongly affect the stability of key reaction intermediates and with that the catalyst's performance and product selectivity. The electric double layer effect is particularly critical in the electrochemical reduction of CO 2 (CO 2 RR). Here, the formation of intermediates like * CO 2 and * OCCO is rate-limiting which give rise to a significant electric dipole that is stabilized by the surrounding double layer field. Despite this recently discovered significance of the electric double layer, a correspondingly corrected descriptorpicture or activity volcano has not been derived so far. Instead, the community has mostly relied on the surface chemical approach resulting in one-dimensional (e.g. CO adsorption energy in CO 2 RR to CO ) or two-dimensional (e.g. C and CO adsorption energies for CO 2 RR to higher reduced products ) activity volcano plots.