Language：English   Publishing type：Research paper (scientific journal)   Publisher：Journal of Physical Chemistry C  

The visible light-response plasmonic photocathodes were established by depositing Au nanorod structures on wide band gap semiconductor electrodes. By using Au nanorods showing multicolor response characteristics, we observed the generations of the photocurrent under multicolor light illuminations. Additionally, we successfully estimated the absolute electrochemical potential of the excited electrons through the photoinduced depositions of metal species. Our important finding is that the electrochemical potential of the reactive electrons changes not only with the wavelength of illuminated light but also with the semiconductor substrates. Insights from our current findings can be used to develop highly efficient systems for converting light into energy.

DOI： 10.1021/acs.jpcc.4c03271

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

Increasing the concentration of carbon dioxide gas (CO2) in the atmosphere is a problem that must be addressed in modern society. A promising alternative solution to overcome this problem is to convert CO2 into fuel and value-added chemical compounds such as formic acid (HCOOH). This study addresses this concern by electrochemical method to reduce CO2 using a boron-doped diamond (BDD) electrode-modified SnO-SnO2/Ti3C2Tx material which acts as a catalyst in improving the performance of the working electrode. The SnO-SnO2/Ti3C2Tx material in this study has three various concentrationsof SnO-SnO2/Ti3C2Tx 0.05 g/mL, SnO-SnO2/Ti3C2Tx 0.1 g/mL, and SnO-SnO2/Ti3C2Tx 0.2 g/mL, which were dropped onto the surface of the BDD electrode and characterized using cyclic voltammetry (CV), scanning electron microscope-energy dispersive X-ray (SEM-EDX), and X-ray photoelectron spectroscopy (XPS). Electroreduction of CO2 in this study was able to produce the highest concentration of HCOOH by using a SnO-SnO2/Ti3C2Tx-BDD 0.2 g/mL electrode at a reduction potential of − 0.903 V (vs. NHE). The resulting HCOOH has a concentration of 21.32 ppm with a faraday efficiency of 94.06%. The SnO-SnO2/Ti3C2Tx-BDD electrode was then compared with the bare-BDD and BDD-MXene electrodes at the same reduction potential of − 0.903 V (vs. NHE). The concentration of HCOOH produced by bare-BDD was 7.63 ppm with a faraday efficiency of 63.28% and for BDD-MXene that is 9.81 ppm with a faraday efficiency of 79.87%. Thus, BDD electrode modified with SnO-SnO2/Ti3C2Tx is effective to reducing the overpotential of CO2 electroreduction and producing a higher efficiency of HCOOH. Graphical Abstract: (Figure presented.)

DOI： 10.1007/s10008-024-05983-7

Web of Science

Scopus

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1039/d3cp06018g

Web of Science

Scopus

PubMed

researchmap

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.sintl.2023.100276

Scopus

researchmap

Language：English   Publishing type：Part of collection (book)  

BDD electrode was utilized as the cathode for the electrochemical CO2 reduction due to its high hydrogen overpotential and high stability. Electroreduction of CO2 is one of the ways to convert CO2 into useful compounds which can be used in industrial fields and can be used as fuels. The efficiency or selectivity for the production of CO2 reduction products can be affected by electrode materials and electrolysis conditions. BDD electrode is inert, so formic acid production was predominant. However, we could also produce various kinds of products from CO2 by optimizing the electrode itself or electrolysis conditions. Many kinds of BDD electrodes were used such as BDD electrodes with various boron doping level, BDD electrodes with sp2 carbon impurities and BDD electrodes modified with metal particles electrochemically. Electrolysis conditions were also optimized such as the applied potential, applied current, catholyte and anolyte. In this chapter, the electrochemical CO2 reduction using BDD electrodes or using metal-modified BDD electrodes was described.

DOI： 10.1007/978-981-16-7834-9_10

Scopus

researchmap