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Vichou E, Adjez Y, Li Y, Gómez-Mingot M, Fontecave M, Sánchez-Sánchez CM. Smart Electrode Surfaces by Electrolyte Immobilization for Electrocatalytic CO 2 Conversion. J Am Chem Soc 2024; 146:2824-2834. [PMID: 38240579 DOI: 10.1021/jacs.3c13315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
The activity and selectivity of molecular catalysts for the electrochemical CO2 reduction reaction (CO2RR) are influenced by the induced electric field at the electrode/electrolyte interface. We present here a novel electrolyte immobilization method to control the electric field at this interface by positively charging the electrode surface with an imidazolium cation organic layer, which significantly favors CO2 conversion to formate, suppresses hydrogen evolution reaction, and diminishes the operating cell voltage. Those results are well supported by our previous DFT calculations studying the mechanistic role of imidazolium cations in solution for CO2 reduction to formate catalyzed by a model molecular catalyst. This smart electrode surface concept based on covalent grafting of imidazolium on a carbon electrode is successfully scaled up for operating at industrially relevant conditions (100 mA cm-2) on an imidazolium-modified carbon-based gas diffusion electrode using a flow cell configuration, where the CO2 conversion to formate process takes place in acidic aqueous solution to avoid carbonate formation and is catalyzed by a model molecular Rh complex in solution. The formate production rate reaches a maximum of 4.6 gHCOO- m-2 min-1 after accumulating a total of 9000 C of charge circulated on the same electrode. Constant formate production and no significant microscopic changes on the imidazolium-modified cathode in consecutive long-term CO2 electrolysis confirmed the high stability of the imidazolium organic layer under operating conditions for CO2RR.
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Affiliation(s)
- Elli Vichou
- Laboratoire de Chimie des Processus Biologiques, Collège de France, UMR 8229 CNRS, Sorbonne Université, PSL Research University, 11 Place Marcelin Berthelot, 75005 Paris, France
- Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, LISE, 4 Place Jussieu, 75005 Paris, France
| | - Yanis Adjez
- Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, LISE, 4 Place Jussieu, 75005 Paris, France
| | - Yun Li
- Laboratoire de Chimie des Processus Biologiques, Collège de France, UMR 8229 CNRS, Sorbonne Université, PSL Research University, 11 Place Marcelin Berthelot, 75005 Paris, France
| | - Maria Gómez-Mingot
- Laboratoire de Chimie des Processus Biologiques, Collège de France, UMR 8229 CNRS, Sorbonne Université, PSL Research University, 11 Place Marcelin Berthelot, 75005 Paris, France
| | - Marc Fontecave
- Laboratoire de Chimie des Processus Biologiques, Collège de France, UMR 8229 CNRS, Sorbonne Université, PSL Research University, 11 Place Marcelin Berthelot, 75005 Paris, France
| | - Carlos M Sánchez-Sánchez
- Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, LISE, 4 Place Jussieu, 75005 Paris, France
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Fajardo-Puerto E, Elmouwahidi A, Bailón-García E, Pérez-Cadenas AF, Carrasco-Marín F. From Fenton and ORR 2e−-Type Catalysts to Bifunctional Electrodes for Environmental Remediation Using the Electro-Fenton Process. Catalysts 2023. [DOI: 10.3390/catal13040674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
Currently, the presence of emerging contaminants in water sources has raised concerns worldwide due to low rates of mineralization, and in some cases, zero levels of degradation through conventional treatment methods. For these reasons, researchers in the field are focused on the use of advanced oxidation processes (AOPs) as a powerful tool for the degradation of persistent pollutants. These AOPs are based mainly on the in-situ production of hydroxyl radicals (OH•) generated from an oxidizing agent (H2O2 or O2) in the presence of a catalyst. Among the most studied AOPs, the Fenton reaction stands out due to its operational simplicity and good levels of degradation for a wide range of emerging contaminants. However, it has some limitations such as the storage and handling of H2O2. Therefore, the use of the electro-Fenton (EF) process has been proposed in which H2O2 is generated in situ by the action of the oxygen reduction reaction (ORR). However, it is important to mention that the ORR is given by two routes, by two or four electrons, which results in the products of H2O2 and H2O, respectively. For this reason, current efforts seek to increase the selectivity of ORR catalysts toward the 2e− route and thus improve the performance of the EF process. This work reviews catalysts for the Fenton reaction, ORR 2e− catalysts, and presents a short review of some proposed catalysts with bifunctional activity for ORR 2e− and Fenton processes. Finally, the most important factors for electro-Fenton dual catalysts to obtain high catalytic activity in both Fenton and ORR 2e− processes are summarized.
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Single-atom nanozymes Co-N-C as an electrochemical sensor for detection of bioactive molecules. Talanta 2023; 254:124171. [PMID: 36495773 DOI: 10.1016/j.talanta.2022.124171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 12/01/2022] [Accepted: 12/03/2022] [Indexed: 12/12/2022]
Abstract
A properly designed sensing interface is crucial for the accurate and sensitive detection of biologically active molecules. Single-atom nanozymes from transition metal and nitrogen-doped carbon materials (M-N-C) have caught attention owing to their large surface area and strong bionic enzyme activity. Herein, a three-dimensional layered electrochemical electrode consisting of a Co-N-C nanoenzyme embedded in a reduced graphene oxide aerogel was prepared for the detection of hydrogen peroxide (H2O2), dopamine (DA) and uric acid (UA). Due to its unique three-dimensional layered structure, rGA has excellent electrical conductivity and high material loading and is used to enhance the electrocatalytic performance of Co-N-C. The combination of single-atom nanozymes and electrochemical detection shows unique advantages in catalytic activity and selectivity. The limit of detection and detection range are 0.74 μM and 3-2991 μM respectively for H2O2. Furthermore, it has been successfully implemented for the in-situ detection of H2O2 in living cells. In addition, their simultaneous detection is also realized by the sensors for DA and UA. And it can accurately capture the signal of UA and DA in the urine. Meanwhile, the electrode displays satisfactory stability and repeatability. Therefore, this paper provides a new detection strategy for a variety of bioactive molecules, showing great potential in cell biology, pathophysiology and diagnostics.
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Zhang W, Li X, Hu X, Li C, Liu S, Ma J, Wang J, Li R, Wang Q, Ding X, Wang Z. A novel electrochemical sensor based on an Fe–N–C/AuNP nanohybrid for rapid and sensitive gallic acid detection. NEW J CHEM 2023. [DOI: 10.1039/d3nj00345k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
An Fe–N–C/AuNP nanohybrid was combined with a glassy carbon electrode to construct a novel electrochemical sensor for rapid detection of gallic acid (GA). The sensor exhibited excellent performance to detect GA with a wide linear response range and low detection limit.
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Affiliation(s)
- Wanqing Zhang
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Xijiao Li
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Xinxin Hu
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Chunxiang Li
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Shanqin Liu
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Jingjing Ma
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Jichao Wang
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Renlong Li
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Qing Wang
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Xiaoman Ding
- School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, 453003, China
| | - Zhiyuan Wang
- China Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, China
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Hao J, Zhang M, Wu C, Wu K. Monodispersed Ni active sites anchored on N-doped porous carbon nanosheets as high-efficiency electrocatalyst for hydrogen peroxide sensing. Anal Chim Acta 2021; 1179:338812. [PMID: 34535246 DOI: 10.1016/j.aca.2021.338812] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 06/27/2021] [Accepted: 06/28/2021] [Indexed: 12/13/2022]
Abstract
Metal active species combined with N-doped porous carbon nanosheets usually own excellent electrochemical activity and sensing performance owing to its unique microstructure and composition. In this work, monodispersed Ni active sites anchored on N-doped porous carbon nanosheets (Ni@N-PCN) were facilely prepared via rational metal-organic frameworks (MOFs) route. Firstly, zeolitic imidazolate frameworks-8 (ZIF-8) was in situ grown on physically-exfoliated graphene nanosheets (GN) with homogeneous sandwich-like structure (ZIF-8@GN). Secondly, nickel bonded ZIF-8@GN hybrids (Ni/ZIF-8@GN) were obtained by ionic exchange reaction, and then transformed into Ni@N-PCN by high-temperature pyrolysis. Benefiting from the monodispersed Ni active sites and highly reactive N-doped porous carbon nanosheets (N-PCN), the as-prepared Ni@N-PCN hybrids displayed superior catalytic performance toward hydrogen peroxide (H2O2) sensing. As a result, a highly sensitive electrochemical sensing platform for H2O2 was fabricated with low detection limit (0.032 μM), wide detection linearity (0.2-2332.8 μM), and high sensitivity (6085 μA cm-2 mM-1). Besides, the as-developed electrochemical sensing platform was successfully applied to detect H2O2 contents in biological medicine and food specimens with satisfied results. This study will provide effective guidance for the preparation of novel metal/N-doped carbon nanomaterials and establishment of high-performance electrochemical sensors.
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Affiliation(s)
- Junxing Hao
- College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China; Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, China
| | - Mengqi Zhang
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Can Wu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, China; School of Materials Science and Engineering, Hubei University, Wuhan, 430062, China.
| | - Kangbing Wu
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
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2‐Methylimidazole‐assisted Morphology Modulation of a Copper‐based Metal‐organic Framework Transducer for Enhanced Electrochemical Peroxidase‐like Activity. ELECTROANAL 2021. [DOI: 10.1002/elan.202100423] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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