Researchers use operando Raman spectroscopy to study the structures of materials at various length scales from bulk to nanoscale while they are functioning. Materials include catalysts, metals, oxides, carbons and electrodes. This system uses different laser excitations to follow the vibrational fingerprints of the materials to derive the molecular structures while they are functioning.
Science Overview
This Raman system has three unique characters designed for in situ/operando study of functional materials: first, it has up to 10 discrete laser excitations covering from UV Raman to near IR Raman. This allows resonance Raman measurements of the structure dispersion of materials. Second, it has various in situ Raman reactor allowing thermal catalysis, electrocatalysis and photocatalysis measurements. Third, it is coupled with an online mass spectrometer permitting the monitoring both reaction products and structure of catalysts simultaneously.
Applications
Multi-wavelength Raman spectroscopy is powerful in characterizing the structural heterogeneity of functional materials through resonance Raman. The structural information can be both surface adsorbed species and the substrate (catalyst) under operando conditions. Previous work includes monitoring thermal catalysis over oxides, supported metals and electrocatalysis over carbon nanostructures.
Specifications
- Laser excitations from UV to NIR including 229, 244, 264, 325, 442, 488, 532 and 633 nm
- Temperature and pressure ranges for in situ reactor: 80 – 1200 K, up to 4 atm
- Gas flow: various oxidative, reductive and reaction feeds
- Operando thermal catalysis, electrocatalysis and photocatalysis
Recent Publications
Su, T.; Hood, Z. D.; Nagui, M.; Bai, L.; Luo, S.; Rouleau, C. M.; Ivanov, I. N.; Ji, H.; Qin, Z.; Wu, Z., 2d/2d Heterojunction of Ti3c2/G-C3n4 Nanosheets for Enhanced Photocatalytic Hydrogen Evolution. Nanoscale 2019, 11, DOI: 10.1039/C9NR00168A.
Su, T.; Shao, Q.; Qin, Z.; Guo, Z.; Wu, Z., Role of Interfaces in Two-Dimensional Photocatalyst for Water Splitting. ACS Catalysis 2018, 8, 2253-2276.
Su, T.; Peng, R.; Hood, Z. D.; Naguib, M.; Ivanov, I. N.; Keum, J. K.; Qin, Z.; Guo, Z.; Wu, Z., One‐Step Synthesis of Nb2o5/C/Nb2c (Mxene) Composites and Their Use as Photocatalysts for Hydrogen Evolution. ChemSusChem 2018.
Adhikari, S. P.; Hood, Z. D.; Wang, H.; Peng, R.; Krall, A.; Li, H.; Chen, V. W.; More, K. L.; Wu, Z.; Geyer, S., Enhanced Visible Light Photocatalytic Water Reduction from a G-C3n4/Srta2o6 Heterojunction. Applied Catalysis B: Environmental 2017, 217, 448-458.
Wang, H.; Peng, R.; Hood, Z. D.; Naguib, M.; Adhikari, S. P.; Wu, Z., Titania Composites with 2 D Transition Metal Carbides as Photocatalysts for Hydrogen Production under Visible‐Light Irradiation. ChemSusChem 2016, 9, 1490-1497.
Peng, R.; Liang, L.; Hood, Z. D.; Boulesbaa, A.; Puretzky, A.; Ievlev, A. V.; Come, J.; Ovchinnikova, O. S.; Wang, H.; Ma, C., In-Plane Heterojunctions Enable Multiphasic Two-Dimensional (2d) Mos2 Nanosheets as Efficient Photocatalysts for Hydrogen Evolution from Water Reduction. ACS Catalysis 2016, 6, 6723-6729.
Zhang, L.; Wu, Z.; Nelson, N. C.; Sadow, A. D.; Slowing, I. I.; Overbury, S. H., Role of Co2 as a Soft Oxidant for Dehydrogenation of Ethylbenzene to Styrene over a High-Surface-Area Ceria Catalyst. ACS Catalysis 2015, 5, 6426-6435.
Tumuluri, U.; Li, M.; Cook, B. G.; Sumpter, B.; Dai, S.; Wu, Z., Surface Structure Dependence of So2 Interaction with Ceria Nanocrystals with Well-Defined Surface Facets. The Journal of Physical Chemistry C 2015, 119, 28895-28905.
Li, M.; Tumuluri, U.; Wu, Z.; Dai, S., Effect of Dopants on the Adsorption of Carbon Dioxide on Ceria Surfaces. ChemSusChem 2015, 8, 3651-3660.
Wu, Z., Multi-Wavelength Raman Spectroscopy Study of Supported Vanadia Catalysts: Structure Identification and Quantification. Chinese Journal of Catalysis 2014, 35, 1591-1608.
