Sequential self-reconstruction of localized Mo species in hierarchical carbon/Co–Mo oxide heterostructures for boosting alkaline hydrogen evolution kinetics and durability

2022 ◽  
Author(s):  
Quan Quan ◽  
Xiuming Bu ◽  
Dong Chen ◽  
Fei Wang ◽  
Xiaolin Kang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Oxide Heterostructures ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Localized Mo ◽  
Hierarchical Carbon

Surface self-reconstruction processes in alkaline hydrogen evolution reaction (HER), especially regarding the explicit structure-activity relationships, remain elusive. Here, we first design a hierarchical Co@NCNT/CoMoOx precatalyst constituted by the defective CoMoOx...

scholarly journals Electronic metal–support interaction modulates single-atom platinum catalysis for hydrogen evolution reaction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yi Shi ◽  
Zhi-Rui Ma ◽  
Yi-Ying Xiao ◽  
Yun-Chao Yin ◽  
Wen-Mao Huang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Structure Activity Relationship ◽  
Atomic Level ◽  
Single Atom ◽  
Activity Relationship ◽  
Support Interaction ◽  
Structure Activity ◽  
Metal Support Interaction ◽  
Metal Support

AbstractTuning metal–support interaction has been considered as an effective approach to modulate the electronic structure and catalytic activity of supported metal catalysts. At the atomic level, the understanding of the structure–activity relationship still remains obscure in heterogeneous catalysis, such as the conversion of water (alkaline) or hydronium ions (acid) to hydrogen (hydrogen evolution reaction, HER). Here, we reveal that the fine control over the oxidation states of single-atom Pt catalysts through electronic metal–support interaction significantly modulates the catalytic activities in either acidic or alkaline HER. Combined with detailed spectroscopic and electrochemical characterizations, the structure–activity relationship is established by correlating the acidic/alkaline HER activity with the average oxidation state of single-atom Pt and the Pt–H/Pt–OH interaction. This study sheds light on the atomic-level mechanistic understanding of acidic and alkaline HER, and further provides guidelines for the rational design of high-performance single-atom catalysts.

Heterogeneous Co–N/C Electrocatalysts with Controlled Cobalt Site Densities for the Hydrogen Evolution Reaction: Structure–Activity Correlations and Kinetic Insights

ACS Catalysis ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 83-97 ◽  
Author(s):  
Young Jin Sa ◽  
Sung O Park ◽  
Gwan Yeong Jung ◽  
Tae Joo Shin ◽  
Hu Young Jeong ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Structure Activity

Hierarchical carbon–silicon nanowire heterostructures for the hydrogen evolution reaction

Nanoscale ◽  
2018 ◽  
Vol 10 (29) ◽  
pp. 13936-13941 ◽  
Author(s):  
Joonhee Moon ◽  
Uk Sim ◽  
Dong Jin Kim ◽  
Hyo-Yong Ahn ◽  
Junghyun An ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Vapor Deposition ◽  
Silicon Nanowire ◽  
Direct Synthesis ◽  
Chemical Vapor ◽  
Cu Foil ◽  
Hierarchical Carbon ◽  
Carbon Nanowires

A facile method for the direct synthesis of carbon nanowires (CNWs) on a SiNW electrode using a chemical vapor deposition (CVD) system with copper (Cu) vapor obtained from a floating Cu foil has been developed.

scholarly journals Theoretical evaluation of the structure–activity relationship in graphene-based electrocatalysts for hydrogen evolution reactions

RSC Advances ◽  
2017 ◽  
Vol 7 (43) ◽  
pp. 27033-27039 ◽  
Author(s):  
Chi Ho Lee ◽  
Byeongsun Jun ◽  
Sang Uck Lee
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrocatalytic Activity ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Theoretical Evaluation ◽  
Structure Activity ◽  
Hydrogen Evolution Reactions ◽  
The Relationship

We systematically analyzed the relationship between structure and electrocatalytic activity of heteroatom-doped graphenes (GXs, where G and X represent graphene and the heteroatom dopant) for the hydrogen evolution reaction (HER).

Ru nanoparticles encapsulated in ZIFs-derived porous N-doped hierarchical carbon nanofibers for enhanced hydrogen evolution reaction

2020 ◽  
Vol 10 (21) ◽  
pp. 7302-7308
Author(s):  
Libing Fan ◽  
Tian Meng ◽  
Qun Li ◽  
Dewen Wang ◽  
Zhicai Xing ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Carbon Nanofibers ◽  
Hydrogen Evolution Reaction ◽  
Ru Nanoparticles ◽  
Hierarchical Carbon

Ru nanoparticles, encapsulated in ZIFs-derived porous N-doped hierarchical carbon nanofibers with excellent HER performance, were achieved.

scholarly journals Increasing the rate of the hydrogen evolution reaction in neutral water with protic buffer electrolytes

2020 ◽  
Vol 117 (52) ◽  
pp. 32947-32953
Author(s):  
Kayla E. Clary ◽  
Metin Karayilan ◽  
Keelee C. McCleary-Petersen ◽  
Haley A. Petersen ◽  
Richard S. Glass ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Sodium Phosphate ◽  
Primary Source ◽  
Phosphate Solution ◽  
Catalytic Current ◽  
Structure Activity ◽  
Proton Source ◽  
Sodium Phosphate Solution ◽  
Current Densities

Electrocatalytic generation of H2 is challenging in neutral pH water, where high catalytic currents for the hydrogen evolution reaction (HER) are particularly sensitive to the proton source and solution characteristics. A tris(hydroxymethyl)aminomethane (TRIS) solution at pH 7 with a [2Fe-2S]-metallopolymer electrocatalyst gave catalytic current densities around two orders of magnitude greater than either a more conventional sodium phosphate solution or a potassium chloride (KCl) electrolyte solution. For a planar polycrystalline Pt disk electrode, a TRIS solution at pH 7 increased the catalytic current densities for H2 generation by 50 mA/cm2 at current densities over 100 mA/cm2 compared to a sodium phosphate solution. As a special feature of this study, TRIS is acting not only as the primary source of protons and the buffer of the pH, but the protonated TRIS ([TRIS-H]+) is also the sole cation of the electrolyte. A species that is simultaneously the proton source, buffer, and sole electrolyte is termed a protic buffer electrolyte (PBE). The structure–activity relationships of the TRIS PBE that increase the HER rate of the metallopolymer and platinum catalysts are discussed. These results suggest that appropriately designed PBEs can improve HER rates of any homogeneous or heterogeneous electrocatalyst system. General guidelines for selecting a PBE to improve the catalytic current density of HER systems are offered.

scholarly journals Understanding structure-activity relationships in linear polymer photocatalysts for hydrogen evolution

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Michael Sachs ◽  
Reiner Sebastian Sprick ◽  
Drew Pearce ◽  
Sam A. J. Hillman ◽  
Adriano Monti ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Linear Polymer ◽  
Structure Activity Relationships ◽  
Structure Activity
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