Polarized Ultrathin BN Induced Dynamic Electron Interactions for Enhancing Acidic Oxygen Evolution

Abstract

Developing ruthenium‐based heterogeneous catalysts with an efficient and stable interface is essential for enhanced acidic oxygen evolution reaction (OER). Herein, we report a defect‐rich ultrathin boron nitride nanosheet support with relatively independent electron donor and acceptor sites, which serves as an electron reservoir and receiving station for RuO2, realizing the rapid supply and reception of electrons. Through precisely controlling the reaction interface, a low OER overpotential of only 180 mV (at 10 mA cm−2) and long‐term operational stability (350 h) are achieved, suggesting potential practical applications. In‐situ characterization and theoretical calculations have validated the existence of a localized electronic recycling between RuO2 and BNNS. The electron‐rich Ru sites accelerate the adsorption of water molecules and the dissociation of intermediates, while the interconnection between the O‐terminal and B‐terminal edge establishes electronic back‐donation, effectively suppressing the over‐oxidation of lattice oxygen. This study provides a new perspective for constructing a stable and highly active catalytic interface.

Constructing Adjustable Heterointerface for Enhancing Acidic Oxygen Evolution Performances of RuO2@CoMnO3 Nanosheets Electrocatalysts

“…Evidently, a distinct straight line with a negative slope (−0.44) suggests that the labeled 18 O content drops rapidly with the extension of the CV test. As for CMR-2, its relative content of 18 O/ 16 O is lower than that of RuO 2 , and the relative content of 18 O/ 16 O descends by ∼1.2% after the four CV runs, which is far lower than ∼10% of RuO 2 (Figure S14). The result represents the high-proportion AEM mechanism in CMR-2, thereby implying its higher stability compared to RuO 2 .…”

“…Two distinctive absorption peaks at 1027 and 1248 cm −1 are ascribed to the bending vibrations of *OOH and Si−O−Si, respectively. 10,18,29 Synchronously, the peak strength of *OOH presents a growing trend with an increasing potential. This corresponds to the fast formation and accretion of massive *OOH, implying that deprotonation of *OOH is probably a rate-determining step.…”

“…The low content of 34 O 2 represents a minimal participation of lattice oxygen, indicating the dominant AEM mechanism for CMR-2. To facilitate a deeper comparison of engagement depths between the LOM and AEM, the content ratio of 18 O/ 16 O is displayed in Figure 3h. Evidently, a distinct straight line with a negative slope (−0.44) suggests that the labeled 18 O content drops rapidly with the extension of the CV test.…”

“…To facilitate a deeper comparison of engagement depths between the LOM and AEM, the content ratio of 18 O/ 16 O is displayed in Figure 3h. Evidently, a distinct straight line with a negative slope (−0.44) suggests that the labeled 18 O content drops rapidly with the extension of the CV test. As for CMR-2, its relative content of 18 O/ 16 O is lower than that of RuO 2 , and the relative content of 18 O/ 16 O descends by ∼1.2% after the four CV runs, which is far lower than ∼10% of RuO 2 (Figure S14).…”

“…3e). Notably, 34 O 2 originates from the combination of 18 O in the lattice and 16 O in the water. The relative contents of 32 O 2 , 34 O 2 , and 36 O 2 are calculated and summarized in Figure 3f,g.…”