Reversible hydrogen spillover in Ru-WO3-x enhances hydrogen evolution activity in neutral pH water splitting

Abstract

Noble metal electrocatalysts (e.g., Pt, Ru, etc.) suffer from sluggish kinetics of water dissociation for the electrochemical reduction of water to molecular hydrogen in alkaline and neutral pH environments. Herein, we found that an integration of Ru nanoparticles (NPs) on oxygen-deficient WO3-x manifested a 24.0-fold increase in hydrogen evolution reaction (HER) activity compared with commercial Ru/C electrocatalyst in neutral electrolyte. Oxygen-deficient WO3-x is shown to possess large capacity for storing protons, which could be transferred to the Ru NPs under cathodic potential. This significantly increases the hydrogen coverage on the surface of Ru NPs in HER and thus changes the rate-determining step of HER on Ru from water dissociation to hydrogen recombination.

Constructing asymmetric active sites on defective Ru/W18O49for photocatalytic nitrogen fixation

“…More importantly, an additional absorption is observed on Ru/W 18 O 49 , ranging from 500 nm to 800 nm, which is due to the LSPR effect between Ru and defective W 18 O 49 via plasmon hybridization. 23,27,32 Thus, the localized electrons within defect states on W 18 O 49 may transfer to Ru via the LSPR effect, further accelerating the N 2 activation on Ru/W 18 O 49 for efficient ammonia synthesis.…”

Progress of electrochemical Synthesis of Nitric Acid: Catalyst Design-Mechanistic insights-Protocol-Challenges

“…[37,38] Then comes the second generation where the hydrogen evaluation reaction (HER) predominates and the hydrogen produced reacts with nitrogen to form ammonia. [39,40] But third generation ammonia production where air nitrogen is directly converted to ammonia is using a satiable electrocatalyst catalyst under ambient conditions without applying any temperature and pressure this process is call electrochemical nitrogen reduction reaction (ENRR). [41,42] Thus, from an economically sustainable point of view an alternative process would be required which could replace the Birkeland-Eyde process as well as the Ostwald process for the formation of nitric acid.…”

Phosphorus vacancies improve the hydrogen evolution of MoP electrocatalysts

“…[4][5][6][7][8] Thereinto, the generation of hydrogen by electrochemically splitting water using renewable electricity is a clean and renewable process. [9][10][11][12] As the cathodic half reaction, the hydrogen evolution reaction (HER) requires efficient and cheap electrocatalysts. As a state-of-the-art electrocatalyst, Pt/C presents an excellent catalytic performance.…”