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.

Enhancing the hydrogen evolution activity of MoS2 basal planes and edges using tunable carbon-based supports

Nanoscale ◽  
2020 ◽  
Author(s):  
Charlie Ruffman ◽  
Calum Keith Gordon ◽  
James Thomas Alan Gilmour ◽  
Frank Donald Mackenzie ◽  
Anna L. Garden
Keyword(s):  
Density Functional Theory ◽  
Free Energy ◽  
Hydrogen Evolution ◽  
Basal Plane ◽  
Density Functional ◽  
Hydrogen Adsorption ◽  
Two Dimensional ◽  
Functional Theory ◽  
Adsorption Free Energy ◽  
Carbon Based

The hydrogen adsorption free energy (ΔGHads) on the basal plane and edges of MoS2 is studied using periodic density functional theory, with the catalyst supported by a range of two-dimensional...

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,...

(002) facets exposed and controllable thickness of CdS nanobelts drive desirable hydrogen-adsorption free energy (△GH) for boosting visible-light photocatalytic performance

2021 ◽  
Author(s):  
Dejian Yan ◽  
Zhiyong Xue ◽  
Feng Chen ◽  
Xia Liu ◽  
Zhenhua Yang ◽  
...  
Keyword(s):  
Free Energy ◽  
Visible Light ◽  
Environmental Pollution ◽  
Economically Disadvantaged ◽  
Photocatalytic Performance ◽  
Hydrogen Adsorption ◽  
Co Catalysts ◽  
Adsorption Free Energy ◽  
Cds Nanobelts ◽  
Visible Light Photocatalytic

In order to obtain the high photocatalytic performance, co-catalysts loading is the most commonly used, which is economically disadvantaged and environmental pollution. Here, we combine the strategy of controllable thickness...

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 Transition-metal single atoms in nitrogen-doped graphenes as efficient active centers for water splitting: a theoretical study

2019 ◽  
Vol 21 (6) ◽  
pp. 3024-3032 ◽  
Author(s):  
Yanan Zhou ◽  
Guoping Gao ◽  
Yan Li ◽  
Wei Chu ◽  
Lin-Wang Wang
Keyword(s):  
Free Energy ◽  
Theoretical Study ◽  
Hydrogen Adsorption ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Active Centers ◽  
Nitrogen Doped ◽  
Single Atoms ◽  
Adsorption Free Energy ◽  
Excellent Catalytic Performance

A triple-coordinated Co exhibits high catalytic activity toward HER with a calculated hydrogen adsorption free energy of −0.01 eV, and a quadruple-coordinated Co shows excellent catalytic performance toward OER with a low computed overpotential of −0.39 V.

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.

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.

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