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-Vs metallene) via a solvothermal method. The ultrathin two-dimensional structure, amorphous/crystalline heterophase structure, and plentiful sulfur vacancy of L-PdS-Vs 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-Vs 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 gcat–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.