Thin-Layer Diamond Coating on Si Wafer for Extended Alkaline ATR-SEIRAS Investigations  

作　　者：Wencheng Li Wei-Yi Zhang Baoxin Ni Peng Shen Yu Qiao Xinchang Wang Xian-Yin Ma Wen-Bin Cai Kun Jiang 

机构地区：[1]Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power,College of Environmental and Chemical Engineering,Shanghai University of Electric Power,Shanghai 200090,China [2]School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [3]Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,Collaborative Innovation Center of Chemistry for Energy Materials,Department of Chemistry,Fudan University,Shanghai 200438,China

出　　处：《Chinese Journal of Chemistry》2024年第23期3063-3068,共6页中国化学(英文版)

基　　金：supported by the National Key R&D Program of China(2022YFB4102000,2022YFA1503803 and 2022YFA1505100);National Natural Science Foundation of China(22002088,22272033,22241201 and 52175423);Shanghai Science and Technology Innovation Action Plan(22dz1205500).

摘　　要：Electrochemical attenuated total reflection surface-enhanced infrared absorption spectroscopy(ATR-SEIRAS)plays an important role in deciphering interfacial reaction mechanisms at molecular level.However,the corrosive etching of Si internal reflection element by OH−largely impedes reliable SEIRAS measurements in strong alkaline electrolytes.Herein,a dense and chemically inert nanocrystalline diamond(NCD)film is successfully fabricated at a thickness of~120 nm through hot filament chemical vapor deposition on a micromachined Si wafer to insulate the OH^(−)etching.A reversible interfacial water feature without spectral interference of Si-O band is obtained in 1.0 mol·L^(–1)KOH on Au/NCD/Si film electrode.Afterwards,electrochemical CO reduction reaction on Cu film electrode is explored in different KOH concentrations ranging from 0.1 to 3.0 mol·L^(-1)as a model reaction.A redshift of CO_(L)band,as well as its lower intensity but faster depletion kinetics,is noted with increasing electrolyte pH,whereas CO_(B)is identified as an inert spectator accumulating on Cu surface.Our present work demonstrates the alkaline resistant feature of diamond/Si composite internal reflection element,which could be a powerful platform to study electrocatalytic reactions in strong alkaline media.

关 键 词：ELECTROCHEMISTRY ELECTROCATALYSIS ATR-SEIRAS Thin-layer diamond Strong alkaline Micromachined Si IR spectroscopy 

分 类 号：TN305[电子电信—物理电子学]