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Effect of the interfacial electric field on the HER on Pt(111)modified with iron adatoms in alkaline media

Chinese Journal of Catalysis 2022年第11期43卷 2826-2836页

作者： Francisco J.Sarabia Víctor Climent Juan M.Feliu Instituto Universitario de Electroquímica Universidad de AlicanteCarretera San Vicente del Raspeig s/nE-03690 San Vicente del RaspeigAlicanteSpain

The study of the hydrogen evolution reaction(HER)aimed to reach a deeper understanding of the parameters that control the rate of this reaction is of great importance given the technical relevance of hydrogen production as an energy vector in the so-called hydrogen *** previous works,laser-induced temperature jump(LITJ)experiments on Pt(111)modified with Ni(OH)_(2)in alkaline media have revealed the importance of the interfacial electric field in the rate of the *** was hypothesised that small amounts of Ni(OH)_(2)cause a decrease of the electric field because of a negative shift of the pzfc toward the onset of the hydrogen *** this work,to test the validity of this hypothesis,the study has been extended to Pt(111)surfaces modified with Fe(OH)_(2).The modified surfaces have been studied voltammetrically,and the voltammetric charges have been *** voltammograms show a peak in the hydrogen evolution region that suggest the transformation in the adlayer from Fe(II)to Fe(0).In agreement with the coulometric analysis,the voltammetric features in the OH adsorption region would be related with the oxidation to the+3 valence *** results obtained with LITJ method reflect the existence of a strong interaction of the Fe oxophilic species with the water molecules,shifting the potential of maximum entropy away from the onset of the ***,the most catalytic surface is the one with the lowest Fe coverage.

关键词： Hydrogen evolution reaction Iron adatoms Platinum single crystal Pt(111) laser induced temperature jump Interfacial electric field Potential of zero charge

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Transitional Process of Ploy（N-isopropylacrylamide） in Deuterated Solution

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Chinese Journal of Chemical Physics 2009年第5期22卷 447-452,I0001页

作者： Shao-hua Zhang Yang Chen Heng Li Yu-xiang Weng Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemical PhysicsUniversity of Science and Technology of China Hefei 230026 China Laboratory of Soft Matter Physics Institute of Physics Chinese Academy of Sciences Beijing National Laboratory of Condensed Matter Physics Beijing 100080 China

The fast phase-transitional process of ploy（N-isopropylacrylamide）（PNIPAM） in deuterated solution was studied by laser induced temperature jump technique combined with time-resolved mid-infrared absorbance difference spectroscopy on nanosecond level. The multi-peaks of amide I＇band of PNIPAM among the energy range of 1565-1700 cm^-1 was experimentally resolved to three groups （i, ii, iii） for the first time, while the distinct threestage procedure in the phase transitional process of long-chain PNIPAM was observed firstly too. Furthermore, proper assignments were also made for the three group peaks in amide I＇band and the three steps in the kinetics process of long-chain PNIPAM.

关键词： Poly(N-isopropylacrylamide) laser induced temperature jump Kinetic Transient mid-infrared absorbance difference spectroscopy Multistage Transitional process

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