Atomically dispersed oxide‐on‐metal inverse nanocatalysts provide a blueprint to amplify the strong oxide–metal interactions for heterocatalysis but remain a grand challenge in fabrication. Here we report a 2D inverse nanocatalyst, RuOx‐on‐Pd nanosheets, by in situ creating atomically dispersed RuOx/Pd interfaces densely on ultrathin Pd nanosheets via a one‐pot synthesis. The product displays unexpected performance toward the oxygen reduction reaction (ORR) in alkaline medium, which represents 8.0‐ and 22.4‐fold enhancement in mass activity compared to the state‐of‐the‐art Pt/C and Pd/C catalysts, respectively, showcasing an excellent Pt‐alternative cathode electrocatalyst for fuel cells and metal–air batteries. Density functional theory calculations validate that the RuOx/Pd interface can accumulate partial charge from the 2D Pd host and subtly change the adsorption configuration of O2 to facilitate the O−O bond cleavage. Meanwhile, the d‐band center of Pd nanosubstrates is effectively downshifted, realizing weakened oxygen binding strength.
Carbon cloth, an inexpensive and conductive textile, holds great promise as substrate for constructing electrical double-layer capacitors due to its mechanical and electrochemical superiority. However, its widespread application is significantly hampered by the intrinsic low specific capacity. In this work, we demonstrate that the areal capacitance of commercial carbon cloth is raised for 800-folds by a direct thermal activation strategy. When evaluated as the symmetric supercapacitor electrodes, thermally activated carbon cloth (TACC) displays the outstanding performance with areal capacitance up to 3291 mF cm À 2 and the energy density of 740 μW h cm À 2 at a power density of 9000 μW cm À 2 . In addition, the TACC-based electrode reserves 95.2 % capacitance after 10,000 chargedischarge cycles in a neutral NaBF 4 electrolyte, showing outstanding cycle durability of the material. This work offers a foolproof and scalable method to prepare flexible electrode materials for wearable energy storage devices.
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