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Water electrolysis to form hydrogen as a solar fuel requires its catalysts to be highly effective. Ni-Mo is known as such a material. In this work, we perform theoretical and experimental studies on the activity and stability of Ni-Mo cathodes. Density functional theory studies show various Ni-Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long-term stability of Ni-Mo cathodes have been determined. We compared Ni-Mo before and after up to 100 h of continuous operation. We show that Ni-Mo is unstable in alkaline media due to Mo leaching in the form of MoO42-, ultimately leading to a decrease in absolute overpotential. We found that the electrolyte, the alkali cations and pH all influence Mo leaching. Changing from Li to Na to K influences the surface segregation of Mo, and pushes the reaction towards Mo dissolution. Decreasing the pH decreases the OH- concentration and in this manner inhibits Mo leaching. Of the electrolytes studied, in terms of stability, the best to use is LiOH at a pH of 13. Thus, we present a mechanism for Mo leaching as well as ways to influence the stability and make the Ni-Mo material more viable for renewable energy storage in chemical bonds.
This article was published in the following journal.
In this work, we reported a comprehensive first-principles study on the hydrogen evolution reaction (HER) catalytic activity of Cu based core-shell nanoparticles (CSNPs). Cu nanoparticle (NP) and M@Cu...
Water splitting is an important method for producing clean and sustainable hydrogen to replace finite fossil fuels in future energy systems. MoS2 is reported as a promising catalyst without noble meta...
Developing efficient and earth-abundant electrocatalysts for electrochemical water splitting is greatly desired due to growing energy demands. Herein, we develop a promising hierarchical nickel-iron-c...
Synergistic integration of two active metal-based compounds can lead to much higher electrocatalytic activity than either of the two individually, due to the interfacial effects. Herein, a proof-of-co...
Fe and N functionalized hollow carbon spheres (Fe/N-HCS) with hierarchically porous structure are constructed. Remarkably, it is discovered that the pyrolysis temperature effects the chemical composit...
This study suggested that hydrogen has a potential as an effective and safe therapeutic agent on cGVHD.
There have been many adjunctive treatments for the additional clinical benefits to scaling and root planing (SRP) in the treatment of chronic periodontitis. Topical hydrogen peroxide (HP) ...
To determine the effectiveness of combining different concentrations of hydrogen peroxide and carbamide used during tooth bleaching.
The overall aim of the study is to investigate the Ponto wide implant considering; initial implant stability, stability over time, skin reaction and long term success when loaded at 3 week...
The purpose of this research study is to test the safety of an oxygen producing gel (produced by combining baking soda and hydrogen peroxide) and see what effects (good and bad) it has on ...
The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life.
An oxidoreductase that catalyzes the reaction between superoxide anions and hydrogen to yield molecular oxygen and hydrogen peroxide. The enzyme protects the cell against dangerous levels of superoxide. EC 126.96.36.199.
Evolution at the molecular level of DNA sequences and proteins. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)
An intra-extracellular electrolyte exchange agent with a variety of effects.
The techniques used to produce molecules exhibiting properties that conform to the demands of the experimenter. These techniques combine methods of generating structural changes with methods of selection. They are also used to examine proposed mechanisms of evolution under in vitro selection conditions.