Accelerating hydrogen evolution at neutral pH by destabilization of water with a conducting oxophilic metal oxide

2020 ◽  
Vol 8 (24) ◽  
pp. 12169-12176
Author(s):  
Zhengzhe Xie ◽  
Wugang Wang ◽  
Ding Ding ◽  
Yu Zou ◽  
Yi Cui ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Hydrogen Evolution ◽  
Water Dissociation ◽  
Recombination Site ◽  
Neutral Ph ◽  
Low Overpotential

Self-supporting Ni4Mo–V2O3 nanosheets, which combine oxophilic V2O3 as a water dissociation center with Ni4Mo as a proton recombination site, display an extremely low overpotential (39.3 mV at 10 mA cm−2) for hydrogen evolution at neutral pH.

scholarly journals Accelerating water dissociation in bipolar membranes and for electrocatalysis

Science ◽  
2020 ◽  
Vol 369 (6507) ◽  
pp. 1099-1103 ◽  
Author(s):  
Sebastian Z. Oener ◽  
Marc J. Foster ◽  
Shannon W. Boettcher
Keyword(s):  
Metal Oxide ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Pure Water ◽  
Proton Exchange ◽  
Alkaline Media ◽  
Water Dissociation ◽  
Bipolar Membranes ◽  
Exchange Layer ◽  
Acidic Proton

Catalyzing water dissociation (WD) into protons and hydroxide ions is important both for fabricating bipolar membranes (BPMs) that can couple different pH environments into a single electrochemical device and for accelerating electrocatalytic reactions that consume protons in neutral to alkaline media. We designed a BPM electrolyzer to quantitatively measure WD kinetics and show that, for metal nanoparticles, WD activity correlates with alkaline hydrogen evolution reaction activity. By combining metal-oxide WD catalysts that are efficient near the acidic proton-exchange layer with those efficient near the alkaline hydroxide-exchange layer, we demonstrate a BPM driving WD with overpotentials of <10 mV at 20 mA·cm−2 and pure water BPM electrolyzers that operate with an alkaline anode and acidic cathode at 500 mA·cm−2 with a total electrolysis voltage of ~2.2 V.

Prebiotic studies on the interaction of zirconia nanoparticles and ribose nucleotides and their role in chemical evolution

2021 ◽  
Vol 20 (2) ◽  
pp. 142-149
Author(s):  
Avnish Kumar Arora ◽  
Pankaj Kumar
Keyword(s):  
Electron Microscopy ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Chemical Evolution ◽  
Ribonucleic Acid ◽  
Zirconium Oxide ◽  
Origins Of Life ◽  
Neutral Ph ◽  
Interaction Studies

AbstractStudies on the interaction of biomolecules with inorganic compounds, mainly mineral surfaces, are of great concern in identifying their role in chemical evolution and origins of life. Metal oxides are the major constituents of earth and earth-like planets. Hence, studies on the interaction of biomolecules with these minerals are the point of concern for the study of the emergence of life on different planets. Zirconium oxide is one of the metal oxides present in earth's crust as it is a part of several types of rocks found in sandy areas such as beaches and riverbeds, e.g. pebbles of baddeleyite. Different metal oxides have been studied for their role in chemical evolution but no studies have been reported about the role of zirconium oxide in chemical evolution and origins of life. Therefore, studies were carried out on the interaction of ribonucleic acid constituents, 5′-CMP (cytidine monophosphate), 5′-UMP (uridine monophosphate), 5′-GMP (guanosine monophosphate) and 5′-AMP (adenosine monophosphate), with zirconium oxide. Synthesized zirconium oxide particles were characterized by using vibrating sample magnetometer, X-Ray Diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy. Zirconia particles were in the nanometre range, from 14 to 27 nm. The interaction of zirconium oxide with ribonucleic acid constituents was performed in the concentration range of 5 × 10−5–300 × 10−5 M. Interaction studies were carried out in three mediums; acidic (pH 4.0), neutral (pH 7.0) and basic (pH 9.0). At neutral pH, maximum interaction was observed. The interaction of zirconium oxide with 5′-UMP was 49.45% and with 5′-CMP 67.98%, while with others it was in between. Interaction studies were Langmurian in nature. Xm and KL values were calculated. Infrared spectral studies of ribonucleotides, metal oxide and ribonucleotide–metal oxide adducts were carried out to find out the interactive sites. It was observed that the nitrogen base and phosphate moiety of ribonucleotides interact with the positive charge surface of metal oxide. SEM was also carried out to study the adsorption. The results of the present study favour the important role of zirconium oxide in concentrating the organic molecules from their dilute aqueous solutions in primeval seas.

Immobilization of a Molecular Cobaloxime Catalyst for Hydrogen Evolution on a Mesoporous Metal Oxide Electrode

2012 ◽  
Vol 124 (51) ◽  
pp. 12921-12925 ◽  
Author(s):  
Nicoleta M. Muresan ◽  
Janina Willkomm ◽  
Dirk Mersch ◽  
Yana Vaynzof ◽  
Erwin Reisner
Keyword(s):  
Metal Oxide ◽  
Hydrogen Evolution ◽  
Oxide Electrode ◽  
Mesoporous Metal ◽  
Mesoporous Metal Oxide

scholarly journals Synergistic Interfacial and Doping Engineering of Heterostructured NiCo(OH)x-CoyW as an Efficient Alkaline Hydrogen Evolution Electrocatalyst

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Ruopeng Li ◽  
Hao Xu ◽  
Peixia Yang ◽  
Dan Wang ◽  
Yun Li ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
High Efficiency ◽  
Low Voltage ◽  
Electrochemical Etching ◽  
Synergistic Effects ◽  
Release Kinetics ◽  
Water Electrolysis ◽  
Water Dissociation ◽  
Practical Applications ◽  
Environmentally Friendly Process

AbstractTo achieve high efficiency of water electrolysis to produce hydrogen (H2), developing non-noble metal-based catalysts with considerable performance have been considered as a crucial strategy, which is correlated with both the interphase properties and multi-metal synergistic effects. Herein, as a proof of concept, a delicate NiCo(OH)x-CoyW catalyst with a bush-like heterostructure was realized via gas-template-assisted electrodeposition, followed by an electrochemical etching-growth process, which ensured a high active area and fast gas release kinetics for a superior hydrogen evolution reaction, with an overpotential of 21 and 139 mV at 10 and 500 mA cm−2, respectively. Physical and electrochemical analyses demonstrated that the synergistic effect of the NiCo(OH)x/CoyW heterogeneous interface resulted in favorable electron redistribution and faster electron transfer efficiency. The amorphous NiCo(OH)x strengthened the water dissociation step, and metal phase of CoW provided sufficient sites for moderate H immediate adsorption/H2 desorption. In addition, NiCo(OH)x-CoyW exhibited desirable urea oxidation reaction activity for matching H2 generation with a low voltage of 1.51 V at 50 mA cm−2. More importantly, the synthesis and testing of the NiCo(OH)x-CoyW catalyst in this study were all solar-powered, suggesting a promising environmentally friendly process for practical applications.

Promoted Alkaline Hydrogen Evolution by N-doped Pt-Ru Single Atoms Alloy

2021 ◽  
Author(s):  
Mi Luo ◽  
Jinyan Cai ◽  
Jiasui Zou ◽  
Zheng Jiang ◽  
Gongming Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Surface Adsorption ◽  
Adsorption Behavior ◽  
Water Dissociation ◽  
Desorption Kinetics ◽  
Catalytic Surface ◽  
Single Atoms

Since water dissociation and H desorption kinetics essentially determine the performance of alkaline hydrogen evolution reaction (HER), rationally regulating surface adsorption behavior to achieve superior catalytic surface is always challenging...

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