As known, the potential always deviated from the balanced potential to ensure the spontaneous reaction of ORR/OER catalytic process , in this work, E is defined to represent the lowest deviated potential. Typically, for ORR process, the 𝐸 𝑂𝑅𝑅 is lower than the standard potential of 1.23 V vs. RHE at 298 K, while the 𝐸 𝑂𝐸𝑅 is higher than that. Moreover, previous study has reported that the potential gap ( ∆𝐸 = 𝐸 𝑂𝐸𝑅 -𝐸 𝑂𝑅𝑅 ) is effectively suitable to present the bifunctional catalytic activity , and the smaller ∆𝐸 suggests the better bifunctional catalytic performance. The calculated polarization curves (describing detailly in the support information) for OER/ORR, as shown in Figure , exhibit the same principle, i.e. the smaller ∆𝐸 corresponds to the higher ORR/OER catalytic efficiency. Therefore, for us, exploring novel catalysts with the lowest ∆𝐸 is still on the road.