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.
Herein, a facile synthesis protocol for the development of directional alignment of CdSe quantum dots (QDs) on the surface of Copper benzene-1, 3, 5-tricarboxylate (CuBTC) metal-organic frameworks (MOFs) was proposed. The sensitization of CdSe QDs with MOFs offered enhancement of light-harvesting
properties in the visible region of the solar spectrum due to the broad absorption band of CdSe QDs. As a photo-anode, it has generated current density of ˜20 mA/cm2 at 1.70 V (vs. Reversible hydrogen electrode (RHE)) during the photo-electrochemical water splitting in 1 M
Na2S electrolyte. The present investigation demonstrates the directional attachment of CdSe QDs on CuBTC is beneficial in facilitating light-harvesting and photo-electrochemical properties of CuBTC MOFs.
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