Sulfur-Vacancy-Rich Pd Metallene Sulfide Nanosheets for the Efficient Electrosynthesis of H₂O₂

It is of great significance to develop electrocatalysts with high activity, selectivity, and stability for the electrosynthesis of H₂O₂. Here, we successfully prepare low-crystalline two-dimensional Pd metallene sulfide with isolated Pd sites and rich sulfur vacancies (L-PdS-V_s metallene) via a solvothermal method. The ultrathin two-dimensional structure, amorphous/crystalline heterophase structure, and plentiful sulfur vacancy of L-PdS-V_s metallene can provide sufficient active sites and a strong electronic effect. Moreover, sulfidation induces the isolation of Pd sites that can inhibit the dissociation of O–O bonds. As such, L-PdS-V_s metallene exhibits excellent electrocatalytic performance with high H₂O₂ selectivity (>90%) under a wide application potential. The average H₂O₂ productivity at 0.3 V is as high as 1.12 mol g_cat^–1 h^–1, and the corresponding FE is over 90%. The sulfidation strategy has multiple advantages and provides an effective strategy for the design of high-performance 2e^– ORR electrocatalysts.