Restructuring highly electron-deficient metal-metal oxides for boosting stability in acidic oxygen evolution reaction

Abstract

The poor catalyst stability in acidic oxidation evolution reaction (OER) has been a long-time issue. Herein, we introduce electron-deficient metal on semiconducting metal oxides-consisting of Ir (Rh, Au, Ru)-MoO3 embedded by graphitic carbon layers (IMO) using an electrospinning method. We systematically investigate IMO’s structure, electron transfer behaviors, and OER catalytic performance by combining experimental and theoretical studies. Remarkably, IMO with an electron-deficient metal surface (Irx+; x > 4) exhibit a low overpotential of only ~156 mV at 10 mA cm−2 and excellent durability in acidic media due to the high oxidation state of metal on MoO3. Furthermore, the proton dissociation pathway is suggested via surface oxygen serving as proton acceptors. This study suggests high stability with high catalytic performance in these materials by creating electron-deficient surfaces and provides a general, unique strategy for guiding the design of other metal-semiconductor nanocatalysts.

Efficient Nitrate Conversion to Ammonia on f-Block Single-Atom/Metal Oxide Heterostructure via Local Electron-Deficiency Modulation

“…22 The durability of Gd SA -D-NiO 400 for the NitRR was further accessed by 15 consecutive electrolysis cycling tests at −0.1 V vs RHE (Figure 4h and Figure S35). 3,34,35 The NH 3 yield rate and FE remained stable with slight fluctuations, suggesting the excellent stability and robustness of the Gd SA stabilized on the defective NiO. Additionally, the in situ/operando Raman spectrum of Gd SA -D-NiO 400 during NitRR was tested.…”

A Facile Synthesis of a Fusiform-Shaped Three-Dimensional Co/Mn@CNDs-MOF Nanocomposite as an Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline Medium

“…These findings show that the Co/Mn@ CNDs-MOF outperformed other current catalysts in terms of OER catalytic activity, owing to its intrinsically high catalyst surface and hierarchical porous structure, which allows for a large surface area and easy carriage of gaseous products. 42 Electrochemical impedance spectroscopy (EIS) was used to further examine the kinetics of charge transfer in OER processes. Figure 7d shows the EIS plots for all the synthesized samples.…”

Coupling Amorphous Ni Hydroxide Nanoparticles with Single-Atom Rh on Cu Nanowire Arrays for Highly Efficient Alkaline Seawater Electrolysis

“…Although the nanostructured noble metal-based catalyst has been generally used in electrocatalyst hydrogen evolution, its widespread application is still hampered by the high cost and natural scarcity. − The platinum-based catalyst also suffers from inferior durability in alkaline seawater electrolysis. , Therefore, it is urgent to design earth-abundant, cost-effective, efficient, and durable electrocatalysts for renewable and sustainable energy using hydrogen. In the past decade, numerous studies have been obtained for seawater electrolysis based on various earth-abundant transition metal compounds such as oxides, sulfides, phosphides, selenides, carbides, nitrides, etc. − However, most of these catalysts exhibit dwarfed activity and stability in large-scale application.…”

“…8−10 The platinum-based catalyst also suffers from inferior durability in alkaline seawater electrolysis. 11,12 Therefore, it is urgent to design earth-abundant, cost-effective, efficient, and durable electrocatalysts for renewable and sustainable energy using hydrogen. In the past decade, numerous studies have been obtained for seawater electrolysis based on various earth-abundant transition metal compounds such as oxides, sulfides, phosphides, selenides, carbides, nitrides, etc.…”