One-dimensional CoS2–MoS2 nano-flakes decorated MoO2 sub-micro-wires for synergistically enhanced hydrogen evolution

Nanoscale ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 3500-3505 ◽  
Author(s):  
Yang Wang ◽  
Yinlong Zhu ◽  
Sepideh Afshar ◽  
Meng Wai Woo ◽  
Jing Tang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Adsorption ◽  
Water Dissociation ◽  
Excellent Performance ◽  
One Dimensional

CoS2–MoS2–MoO2 (CoMoOS) can synergistically catalyze alkaline HER with excellent performance, where MoO2 promotes water dissociation and CoS2–MoS2 nano-flakes facilitate the hydrogen adsorption.

scholarly journals Anomalous hydrogen evolution behavior in high-pH environment induced by locally generated hydronium ions

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Xuesi Wang ◽  
Chaochen Xu ◽  
Mietek Jaroniec ◽  
Yao Zheng ◽  
Shi-Zhang Qiao
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Adsorption ◽  
Water Dissociation ◽  
In Situ Raman Spectroscopy ◽  
Kinetic Measurements ◽  
High Ph ◽  
Hydronium Ions ◽  
Adsorption Processes ◽  
Bulk Model ◽  
Evolution Behavior

Abstract Most fundamental studies of electrocatalysis are based on the experimental and simulation results obtained for bulk model materials. Some of these mechanistic understandings are inapplicable for more active nanostructured electrocatalysts. Herein, considering the simplest and most typical electrocatalytic process, the hydrogen evolution reaction, an alternative reaction mechanism is proposed for nanomaterials based on the identification of a new intermediate, which differs from those commonly known for the bulk counterparts. In-situ Raman spectroscopy and electrochemical thermal/kinetic measurements were conducted on a series of nanomaterials under different conditions. In high-pH electrolytes with negligible hydronium (H3O+) concentration in bulk phase, massive H3O+ intermediates are found generating on the catalytic surface during water dissociation and hydrogen adsorption processes. These H3O+ intermediates create a unique acid-like local reaction environment on nanostructured catalytic surfaces and cut the energy barrier of the overall reaction. Such phenomena on nanostructured electrocatalysts explain their widely observed anomalously high activity under high-pH conditions.

scholarly journals RuxSe@MoS2 hybrid as a highly efficient electrocatalyst toward hydrogen evolution reaction

RSC Advances ◽  
2019 ◽  
Vol 9 (24) ◽  
pp. 13486-13493 ◽  
Author(s):  
Qi Chen ◽  
Kefeng Wang ◽  
Jingjing Qin ◽  
Songzhu Wang ◽  
Wei Wei ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Hydrogen Adsorption ◽  
Water Dissociation ◽  
Highly Efficient

The bifunctionality mechanism of RuxSe@MoS2 greatly enhances the alkaline HER performance, in which Ru promotes water dissociation and the nearby Se atoms, unsaturated Mo and/or S atoms act as active sites for the intermediate hydrogen adsorption.

Synergistically enhanced hydrogen evolution electrocatalysis by in situ exsolution of metallic nanoparticles on perovskites

2018 ◽  
Vol 6 (28) ◽  
pp. 13582-13587 ◽  
Author(s):  
Yinlong Zhu ◽  
Jie Dai ◽  
Wei Zhou ◽  
Yijun Zhong ◽  
Huanting Wang ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Hydrogen Evolution ◽  
Metallic Nanoparticles ◽  
High Efficiency ◽  
Hydrogen Adsorption ◽  
Water Dissociation

The metal nanoparticles (NPs)/perovskite hybrid prepared by in situ exsolution can synergistically catalyze the alkaline HER with high efficiency whereby the perovskite promotes water dissociation and metal NPs enable favorable hydrogen adsorption.

Enhanced alkaline hydrogen evolution performance of ruthenium by synergetic doping of cobalt and phosphorus

2020 ◽  
Vol 4 (9) ◽  
pp. 4637-4643
Author(s):  
Chun Hu ◽  
Wei Zhao ◽  
Fuqiang Huang ◽  
Jiacheng Wang
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Adsorption ◽  
Water Dissociation ◽  
Dissociation Barrier

The synergistic doping of Co and P into Ru could reduce the water dissociation barrier and optimize the hydrogen adsorption strength.

scholarly journals Theoretical Insights into the Hydrogen Evolution Reaction on the Ni3N Electrocatalyst

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 716
Author(s):  
Russell W. Cross ◽  
Sachin R. Rondiya ◽  
Nelson Y. Dzade
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Hydrogen Adsorption ◽  
Water Dissociation ◽  
Metallic Nickel ◽  
Surface Stability ◽  
Adsorption Sites ◽  
Surface Energies

Ni-based catalysts are attractive alternatives to noble metal electrocatalysts for the hydrogen evolution reaction (HER). Herein, we present a dispersion-corrected density functional theory (DFT-D3) insight into HER activity on the (111), (110), (001), and (100) surfaces of metallic nickel nitride (Ni3N). A combination of water and hydrogen adsorption was used to model the electrode interactions within the water splitting cell. Surface energies were used to characterise the stabilities of the Ni3N surfaces, along with adsorption energies to determine preferable sites for adsorbate interactions. The surface stability order was found to be (111) < (100) < (001) < (110), with calculated surface energies of 2.10, 2.27, 2.37, and 2.38 Jm−2, respectively. Water adsorption was found to be exothermic at all surfaces, and most favourable on the (111) surface, with Eads = −0.79 eV, followed closely by the (100), (110), and (001) surfaces at −0.66, −0.65, and −0.56 eV, respectively. The water splitting reaction was investigated at each surface to determine the rate determining Volmer step and the activation energies (Ea) for alkaline HER, which has thus far not been studied in detail for Ni3N. The Ea values for water splitting on the Ni3N surfaces were predicted in the order (001) < (111) < (110) < (100), which were 0.17, 0.73, 1.11, and 1.60 eV, respectively, overall showing the (001) surface to be most active for the Volmer step of water dissociation. Active hydrogen adsorption sites are also presented for acidic HER, evaluated through the ΔGH descriptor. The (110) surface was shown to have an extremely active Ni–N bridging site with ΔGH = −0.05 eV.

Polyvinylpyrrolidone Gel Based Pt/Ni(OH)2 Heterostructures with Redistributing Charges for Enhanced Alkaline Hydrogen Evolution Reaction

2021 ◽  
Author(s):  
Jin Li ◽  
Bo Li ◽  
He Huang ◽  
Shuo Yan ◽  
Changzhou Yuan ◽  
...  
Keyword(s):  
Free Energy ◽  
Hydrogen Evolution ◽  
Gibbs Free Energy ◽  
Hydrogen Evolution Reaction ◽  
Dissociation Energy ◽  
Active Sites ◽  
Hydrogen Adsorption ◽  
Water Dissociation ◽  
Promising Strategy

Optimizing water dissociation energy and hydrogen adsorption Gibbs free energy of active sites through redistributing charges in heterostructures are a promising strategy for improving alkaline hydrogen evolution reaction (HER). Herein,...

Selective phosphidation: an effective strategy toward CoP/CeO2 interface engineering for superior alkaline hydrogen evolution electrocatalysis

2018 ◽  
Vol 6 (5) ◽  
pp. 1985-1990 ◽  
Author(s):  
Rong Zhang ◽  
Xiang Ren ◽  
Shuai Hao ◽  
Ruixiang Ge ◽  
Zhiang Liu ◽  
...  
Keyword(s):  
Free Energy ◽  
Hydrogen Evolution ◽  
Hydrogen Adsorption ◽  
Water Dissociation ◽  
Effective Strategy ◽  
Interface Engineering ◽  
Adsorption Free Energy ◽  
Ti Mesh

In 1.0 M KOH, CoP–CeO2 nanosheets film on Ti mesh (CoP–CeO2/Ti) attains 10 mA cm−2 at overpotential of 43 mV due to its lower water dissociation free energy and more optimal hydrogen adsorption free energy than CoP.

Flower-like tungsten-doped Fe–Co phosphides as efficient electrocatalysts for hydrogen evolution reaction

CrystEngComm ◽  
2021 ◽  
Author(s):  
Qian Zhang ◽  
Shuihua Tang ◽  
Lieha Shen ◽  
Weixiang Yang ◽  
Zhen Tang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Adsorption Energy ◽  
High Performance ◽  
Hydrogen Adsorption ◽  
Cost Effective

Developing cost-effective and high-performance electrocatalysts for hydrogen evolution reaction (HER) are imperative thanks to rapid increase of fuel-cell driven vehicles. Tungsten (W) possesses advantages of optimized hydrogen adsorption energy and...

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