请用专业的学术英语润色这段话Subsequently the AAOR performance by different metal-based Fe Mn Co Ni Cu catalysts with the same mass loadings are tested We found that 25FeKJ catalyst exhibited the best catalytic perf

Subsequently, the AAOR performance of various metal-based catalysts (Fe, Mn, Co, Ni, Cu) with identical mass loadings was evaluated. The results indicated that the 2.5%Fe@KJ catalyst exhibited the highest catalytic activity, achieving an ultra-high current density of 1 A/cm2 at a potential of only 0.75 V (vs. RHE) at room temperature (RT) (Fig. 3c). Conversely, the AAOR performance catalyzed by pure KJ was significantly inferior to that of metal-based catalysts, implying that transition metals served as the active centers for catalytic AA oxidation. To determine the optimal loading, the AAOR performance of catalysts with varying Fe contents@KJ was tested, revealing that the ideal Fe wt.% loading (@KJ) was approximately 2.5 wt.% (Fig. S4). Electrochemical impedance spectroscopy (EIS) and Bode plot were conducted at different potentials to investigate the kinetic process of AAOR (Fig. 3d and Fig. S5). Notably, in the low-frequency region, the Nyquist plot exhibited a dramatic change as the potential increased, gradually splitting from a straight line to two semicircular curves when the potential exceeded 0.6 V vs. RHE, indicating the occurrence of AAOR. As the operating potential increased, the semicircular curve of AAOR became smaller, indicating a decrease in impedance and faster reaction kinetics of AA electrocatalytic oxidation. Moreover, EIS analysis was performed for various metals (Fig. S6), showing that the charge transfer impedance of Fe single-atom catalyst was the smallest at the same potential compared to other metals, indicating faster kinetics of Fe reaction with AA, consistent with the LSV results. The long-term stability of catalysts under acidic conditions is a significant challenge, particularly for non-precious metal electrocatalysts. Therefore, the durability of the 2.5%Fe@KJ catalyst for AA oxidation was evaluated by chronopotentiometry assays at 100 mA/cm2. The results indicated that the Fe activity did not exhibit significant degradation for more than 100 h (Fig. 3e), surpassing the long-term stability of the presently reported hydrogen production system coupled with biomass electrooxidation. Additionally, the Fe ions in AA solution were measured at different reaction times by ICP-OES, revealing that the corrosion rate of Fe ions was approximately 0.0042 ug/(L h) (Fig. S7), indicating that the catalyst demonstrated excellent stability.