Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: unknown
Published: Jan. 1, 2024
The synergistic effect of hierarchically porous structures, advanced mass and charge transport abilities, abundant active centers in self-supported carbonized wood electrodes is beneficial for boosting both the OER HER.
Language: Английский
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 27, 2024
Abstract Controlling the electronic structure based on valence state is key for effective electrocatalysis, and challenge lies in attaining optimal metal states. Here, a new approach called valence‐elastic control introduced to create intermediate‐valence Ru species within a‐RuO x /C catalyst matrices. By utilizing hetero‐interfaces between RuO C, pathways efficient electron transfer precise adjustment are activated through switchable bonding at interfaces. The demonstrates exceptional performance hydrogen evolution reaction with an unprecedentedly low overpotential of 4.1 mV KOH + seawater electrolytes 10 mA cm −2 . Furthermore, two‐electrode electrolyzer improved stability voltage efficiency compared commercial Pt/C‐based system. situ tests combined theoretical analysis reveal water dissociation *H adsorption optimized by interface tailored species. This study showcases transformative design framework next‐generation high‐efficiency catalysts variable valence.
Language: Английский
Citations
1
Catalysts, Journal Year: 2024, Volume and Issue: 14(8), P. 491 - 491
Published: July 31, 2024
Tuning the chemical and structural environment of Ru-based nanomaterials is a major challenge for achieving active stable hydrogen evolution reaction (HER) electrocatalysis. Here, we anchored ultrafine Ru nanoparticles (with size ~4.2 nm) on hierarchical Ni2P array (Ru/Ni2P) to enable highly efficient HER. The promoter weakened adsorption proton sites by accepting electrons from nanoparticles. Moreover, endowed catalysts with large surface area open structure. Consequently, as-fabricated Ru/Ni2P electrode displayed low overpotential 57 164 mV at HER current densities 10 50 mA cm−2, respectively, comparable state-of-the-art Pt catalysts. can operate stably 96 h cm−2 without performance degradation. After pairing commercial RuO2 anode, anode catalyzed overall water splitting 1.73 V density which was 0.16 lower than its Ni counterpart. In situ Raman studies further revealed optimized Ru-active promoter, thus enhancing electrocatalytic performance.
Language: Английский
Citations
0
Nanoscale, Journal Year: 2024, Volume and Issue: 16(37), P. 17519 - 17526
Published: Jan. 1, 2024
The manipulation of rectifying contact between metal and semiconductor represents a powerful strategy to modify the electronic configuration active sites for improved electrocatalytic performance. Herein, we present an NaCl template-assisted approach rationally construct Schottky electrocatalyst consisting honeycomb-like N-doped carbon matrix decorated with uniformly ultrasmall Ru nanoparticles average diameter 2.5 nm (hereafter abbreviated as NPs@HNC). It is found that Fermi level difference HNC can cause self-driven migration electrons from NPs substrate, which leads generation built-in electric field directional flow electrons, thereby enhancing intrinsic activity. In addition, immobilization ultrafine on skeleton effectively inhibit undesired migration, agglomeration detachment sites, thus ensuring remarkable structural stability. As result, NPs@HNC optimal delivers superior electrochemical activity small overpotential 28 mV at 10 mA cm
Language: Английский
Citations
0
Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: unknown
Published: Jan. 1, 2024
The synergistic effect of hierarchically porous structures, advanced mass and charge transport abilities, abundant active centers in self-supported carbonized wood electrodes is beneficial for boosting both the OER HER.
Language: Английский
Citations
0