Stabilization of Ru NPs over 3D LaCrO₃ Nanostructures for High-Performance HER Catalysts in Acidic Media

Abstract

Hydrogen is considered as one of the best alternatives to carbon-based fossil fuels as energy sources. Electrocatalytic water splitting is one of the finest and eco-friendly methods for the production of hydrogen as compared to all other methods such as stream reforming carbon, hydrolysis of metal hydrides, etc. However, the sluggish kinetics on both the half-cell reactions limits the large-scale production of hydrogen. Hence, to overcome such kind of kinetic issues, designing a catalyst with characteristics of low overpotential and high stability is a matter of prime importance for the research community. Perovskite oxides are one of the welldocumented materials for their excellent electrocatalytic water oxidation activity. But because of the lack of a proper proton adsorption site, these materials are unable to show proper hydrogen evolution reaction (HER) activity. Several strategies have been adopted for improving the HER activity of perovskite materials like cation doping, nanostructuring, etc. Here in this work, we prepared a shape-selective LaCrO 3 (LCO) material. To enhance the electrocatalytic activity, we decorated the LCO with Ru nanoparticles via a hydrothermal method with different concentrations of Ru (Ru@LaCrO 3 ), coined LCO n (n = 1−2.5). The assynthesized RLCO 2.5 showed the highest HER activity by demanding a low overpotential of 150 mV, whereas bare LCO demanded a higher overpotential of 364 mV to reach the benchmark current density of 10 mA/cm 2 . Also, RLCO 2.5 showed a very low R ct value of 15.8 Ω and followed the facile kinetics with a lower Tafel value of 101 mV/dec. It also showed excellent stability over 55 h at a current density of 10 mA/cm 2 in chronoamperometry studies. Acceleration degradation studies of RLCO 2.5 showed comparably good activity with a small hike in overpotential toward HER. Hence, RLCO-based materials are highly helpful to develop efficient electrocatalysts to produce hydrogen in a large scale.

Decoration of Au Nanoparticles over LaFeO3: A High Performance Electrocatalyst for Total Water Splitting

“…Perovskite oxides (ABO 3 ) are extremely desirable among the various materials as electrocatalysts, from the literature, primarily because of their unique physical and chemical characteristics. − These perovskite materials primarily have greater heat resistance than other noble metal-based materials. This perovskite oxide material family exhibits many properties like magnetic, electrical, and optical properties with different structures like cubic, hexagonal, and orthorhombic.…”

Designing AgBi3S5 as an efficient electrocatalyst for hydrogen evolution reaction

“…To conrm the steadiness of the most active catalyst ABS a dynamic stability study was executed through an acceleration degradation (AD) study at 100 mV s −1 cycles 500 times in a 0.5 M H 2 SO 4 solution. 65 Following the AD study, LSV polarization analysis was carried out, and a comparison of the catalytic activity of ABS initially and aer completion of the AD study is given in Fig. 9a.…”

“…To confirm the steadiness of the most active catalyst ABS a dynamic stability study was executed through an acceleration degradation (AD) study at 100 mV s −1 cycles 500 times in a 0.5 M H 2 SO 4 solution. 65…”

Empowering the Water Oxidation Activity of the Bimetallic Metal–Organic Framework by Annexing Gold Nanoparticles over the Catalytic Surface

“…Many reports show that the incorporation of low concentrations of noble metals like Ru, Au, and Ag into the framework as electrocatalysts can enhance the electroactivity toward the OER. − Furthermore, the decoration or incorporation of low concentrations of noble metals would lead to a heterointerface and facilitate electron transfer kinetics via the interface throughout the OER process.…”