Amine-Functionalized Diamond Electrode for Boosting CO₂ Reduction to CO

Abstract

Carbon capture, utilization, and storage (CCUS) have been attracting much attention as an initiative to achieve carbon neutrality. In the capture and storage strategy, amines are widely used for highly efficient separation and capturing of CO 2 since amines react with CO 2 to form carbamates. In the utilization strategy, CO 2 electroreduction is a promising method to convert CO 2 into value-added compounds because reaction conditions are relatively mild and easily controlled. In this work, toward combining CO 2 capture and storage technologies and CO 2 electroreduction, we focused on amine modification of the electrode surface, in which borondoped diamond (BDD) was chosen as a sustainable electrode material. CO 2 electroreduction using the amine-modified BDD was performed, and an applied potential dependence of the product selectivity was examined. In situ attenuated total reflectance-infrared measurements showed that the peak intensity of the stretching vibration of the carbonyl group at around 1640 cm −1 decreased as applied potentials became more negative. The effect of amine modification of the BDD surface lies in the formation of a C−N bond during CO 2 electroreduction, resulting in the enhancement of the selectivity of CO production up to 8 times compared to the unmodified BDD.

Impact of gate electrode on free chlorine sensing performance in solution-gated graphene field-effect transistors

“…If interfering redox species are present, enhancing the contribution of free chlorine to the electrode potential can be achieved by modifying the gate electrode surface with free chlorine-sensitive substances like amine groups. 15,41 This modication stabilizes the electrode potential by providing moderate redox properties to electrodes with inert surfaces like BDD, thereby decreasing potential uctuations at low free chlorine concentrations and enhancing sensor reproducibility. Moreover, the implementation of a dualgate conguration using materials with different sensitivities and achieving multi-signal integration could effectively incorporate statistical approaches, such as machine learning, thereby enhancing accuracy and robustness.…”

Designing Molecularly Imprinted Polymer-Modified Boron-Doped Diamond Electrodes for Highly Selective Electrochemical Drug Sensors

“…The scanning range was from 0.5 to −3.25 V (vs Ag/AgCl), and the respective number of scan cycles and scan rate were 80 and 0.1 V s −1 . 28,29 Fabrication of MIP-Modified BDD Electrodes. The temperature-responsive MIPs were polymerized onto linker-modified BDD.…”

“…For electrografting onto the hydrogen-terminated BDD (geometric area: 3.40 cm 2 ), cyclic voltammetry (CV) was performed by using an acetonitrile solution containing the N -(4-iodophenyl)­acrylamide linker (10 mM) and LiClO 4 (0.1 M) for surface modification. The scanning range was from 0.5 to −3.25 V (vs Ag/AgCl), and the respective number of scan cycles and scan rate were 80 and 0.1 V s –1 . , …”

Regulation of polyaniline thickness and substitution position on Cu foams to optimize hydrogen evolution and ethanol oxidation performance

“…The particular coordination between polymers and metals has gained increasing interest in the field of hydrogen production via water splitting because of their abundant electrochemical active sites and superior electron transfer capacity. [30][31][32] The schematic of the PANI-modified Cu foam electrodes is presented in Fig. 1a.…”