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Li H, Chen Y, Huang H, Cheng Z, Bai S, Lai F, Zhang N, Liu T. Amorphous ZnSnO x Hollow Spheres Enable Highly Efficient CO 2 Reduction. CHEMSUSCHEM 2024; 17:e202301694. [PMID: 38470947 DOI: 10.1002/cssc.202301694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 03/08/2024] [Accepted: 03/12/2024] [Indexed: 03/14/2024]
Abstract
Carbon dioxide (CO2) adsorption and electron transport play an important role in CO2 reduction reaction (CO2RR). Herein, we have demonstrated a new class of diverse hollow ZnSnOx (ZSO) through the amorphization of hydroxides to enhance CO2 adsorption and accelerate electron transport. The amorphization is occurred by calcination process, as indicated by Fourier transform infrared spectroscopy and Raman spectra. In particular, the ZnSnOx hollow spheres (ZSO HSs) achieve a high Faradaic efficiency (FE) of HCOOH up to 92.7 % at best, outperforming the commercial ZSO (Comm. ZSO, 85.7 %). ZSO HSs also exhibit durable stability with negligible activity decay after 10 h of successive electrolysis. In-situ attenuated total reflectance infrared absorption spectroscopy further reveals strong adsorption of CO2 and rapid intermediate configuration transformation in amorphous ZSO HSs. This work demonstrates the practical application of ZSO for CO2RR and provides a new insight to create efficient CO2RR electrocatalysts.
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Affiliation(s)
- Hanjun Li
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Yao Chen
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Honggang Huang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Zijing Cheng
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Shuxing Bai
- College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, 266071, China
| | - Feili Lai
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Nan Zhang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
| | - Tianxi Liu
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China
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Hao Q, Zhen C, Tang Q, Wang J, Ma P, Wu J, Wang T, Liu D, Xie L, Liu X, Gu MD, Hoffmann MR, Yu G, Liu K, Lu J. Universal Formation of Single Atoms from Molten Salt for Facilitating Selective CO 2 Reduction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2406380. [PMID: 38857899 DOI: 10.1002/adma.202406380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Revised: 06/07/2024] [Indexed: 06/12/2024]
Abstract
Clarifying the formation mechanism of single-atom sites guides the design of emerging single-atom catalysts (SACs) and facilitates the identification of the active sites at atomic scale. Herein, a molten-salt atomization strategy is developed for synthesizing zinc (Zn) SACs with temperature universality from 400 to 1000/1100 °C and an evolved coordination from Zn-N2Cl2 to Zn-N4. The electrochemical tests and in situ attenuated total reflectance-surface-enhanced infrared absorption spectroscopy confirm that the Zn-N4 atomic sites are active for electrochemical carbon dioxide (CO2) conversion to carbon monoxide (CO). In a strongly acidic medium (0.2 m K2SO4, pH = 1), the Zn SAC formed at 1000 °C (Zn1NC) containing Zn-N4 sites enables highly selective CO2 electroreduction to CO, with nearly 100% selectivity toward CO product in a wide current density range of 100-600 mA cm-2. During a 50 h continuous electrolysis at the industrial current density of 200 mA cm-2, Zn1NC achieves Faradaic efficiencies greater than 95% for CO product. The work presents a temperature-universal formation of single-atom sites, which provides a novel platform for unraveling the active sites in Zn SACs for CO2 electroreduction and extends the synthesis of SACs with controllable coordination sites.
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Affiliation(s)
- Qi Hao
- School of Materials Science & Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
- School of Engineering, Westlake University, Hangzhou, Zhejiang, 310030, China
| | - Cheng Zhen
- Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
- Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang, 315200, China
| | - Qi Tang
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China
- School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Jiazhi Wang
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Peiyu Ma
- Key Laboratory of Precision and Intelligent Chemistry, National Synchrotron Radiation Laboratory, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Junxiu Wu
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
| | - Tianyang Wang
- School of Engineering, Westlake University, Hangzhou, Zhejiang, 310030, China
| | - Dongxue Liu
- Key Laboratory of Automobile Materials Ministry of Education and College of Materials Science and Engineering, Jilin University, Changchun, Jilin, 130022, China
| | - Linxuan Xie
- School of Engineering, Westlake University, Hangzhou, Zhejiang, 310030, China
| | - Xiao Liu
- School of Engineering, Westlake University, Hangzhou, Zhejiang, 310030, China
| | - M Danny Gu
- Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang, 315200, China
| | - Michael R Hoffmann
- Department of Environmental Science and Engineering, California Institute of Technology, 1200 E California Blvd, Pasadena, CA, 91125, USA
| | - Gang Yu
- Merging Contaminants Research Center, Beijing Normal University, Zhuhai, Guangdong, 519087, China
| | - Kai Liu
- School of Engineering, Westlake University, Hangzhou, Zhejiang, 310030, China
| | - Jun Lu
- College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China
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Wang Z, Xu L, Zhou Y, Liang Y, Yang J, Wu D, Zhang S, Han X, Shi X, Li J, Yuan Y, Deng P, Tian X. Stabilizing the oxidation state of catalysts for effective electrochemical carbon dioxide conversion. Chem Soc Rev 2024; 53:6295-6321. [PMID: 38722208 DOI: 10.1039/d3cs00887h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
In the electrocatalytic CO2 reduction reaction (CO2RR), metal catalysts with an oxidation state generally demonstrate more favorable catalytic activity and selectivity than their corresponding metallic counterparts. However, the persistence of oxidative metal sites under reductive potentials is challenging since the transition to metallic states inevitably leads to catalytic degradation. Herein, a thorough review of research on oxidation-state stabilization in the CO2RR is presented, starting from fundamental concepts and highlighting the importance of oxidation state stabilization while revealing the relevance of dynamic oxidation states in product distribution. Subsequently, the functional mechanisms of various oxidation-state protection strategies are explained in detail, and in situ detection techniques are discussed. Finally, the prevailing and prospective challenges associated with oxidation-state protection research are discussed, identifying innovative opportunities for mechanistic insights, technology upgrades, and industrial platforms to enable the commercialization of the CO2RR.
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Affiliation(s)
- Zhitong Wang
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Lizhi Xu
- Hainan Provincial Ecological and Environmental Monitoring Centre, Haikou 571126, China
| | - Yansong Zhou
- State Key Laboratory of Photovoltaic Science and Technology, Institute for Electric Light Sources, School of Information Science and Technology, Fudan University, Shanghai, 200433, China
| | - Ying Liang
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Jinlin Yang
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Daoxiong Wu
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Shuyu Zhang
- State Key Laboratory of Photovoltaic Science and Technology, Institute for Electric Light Sources, School of Information Science and Technology, Fudan University, Shanghai, 200433, China
| | - Xingqi Han
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Xiaodong Shi
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Jing Li
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Yuliang Yuan
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Peilin Deng
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
| | - Xinlong Tian
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China.
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4
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Wang M, Chen C, Jia S, Han S, Dong X, Zhou D, Yao T, Fang M, He M, Xia W, Wu H, Han B. Enhancing C 2+ product selectivity in CO 2 electroreduction by enriching intermediates over carbon-based nanoreactors. Chem Sci 2024; 15:8451-8458. [PMID: 38846399 PMCID: PMC11151859 DOI: 10.1039/d4sc01735h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Accepted: 04/30/2024] [Indexed: 06/09/2024] Open
Abstract
Electrochemical CO2 reduction reaction (CO2RR) to multicarbon (C2+) products faces challenges of unsatisfactory selectivity and stability. Guided by finite element method (FEM) simulation, a nanoreactor with cavity structure can facilitate C-C coupling by enriching *CO intermediates, thus enhancing the selectivity of C2+ products. We designed a stable carbon-based nanoreactor with cavity structure and Cu active sites. The unique geometric structure endows the carbon-based nanoreactor with a remarkable C2+ product faradaic efficiency (80.5%) and C2+-to-C1 selectivity (8.1) during the CO2 electroreduction. Furthermore, it shows that the carbon shell could efficiently stabilize and highly disperse the Cu active sites for above 20 hours of testing. A remarkable C2+ partial current density of-323 mA cm-2 was also achieved in a flow cell device. In situ Raman spectra and density functional theory (DFT) calculation studies validated that the *COatop intermediates are concentrated in the nanoreactor, which reduces the free energy of C-C coupling. This work unveiled a simple catalyst design strategy that would be applied to improve C2+ product selectivity and stability by rationalizing the geometric structures and components of catalysts.
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Affiliation(s)
- Min Wang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Chunjun Chen
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Shuaiqiang Jia
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Shitao Han
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Xue Dong
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Dawei Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Ting Yao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Minghui Fang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Mingyuan He
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Wei Xia
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Haihong Wu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
| | - Buxing Han
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, State Key Laboratory of Petroleum Molecular & Process Engineering, School of Chemistry and Molecular Engineering, East China Normal University Shanghai 200062 China
- Institute of Eco-Chongming 20 Cuiniao Road, ChenjiaTown, Chongming District Shanghai 202162 China
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China
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5
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Zhang J, Wang Y, Li Y. Not One, Not Two, But at Least Three: Activity Origin of Copper Single-Atom Catalysts toward CO 2/CO Electroreduction to C 2+ Products. J Am Chem Soc 2024; 146:14954-14958. [PMID: 38804682 DOI: 10.1021/jacs.4c05669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Copper (Cu) single-atom catalysts (SACs) exhibit great potential for generating multicarbon (C2+) products, but the intrinsic activity of single-atom Cu (Cu1) under realistic conditions remains controversial. Herein, we perform extensive calculations with explicit solvation to investigate the underlying mechanism of Cu SACs, disclosing the absence of C2+ activity in Cu1 sites regardless of the different substrates. The original Cu1 sites (first taking Cu1 stably anchored on carbon nitride as an example) cannot facilitate *CO hydrogenation and CO-CO coupling due to the lack of active sites nearby, and they are unstable under operation, causing leaching and aggregation to form small Cu clusters. The derived Cu clusters composed of at least three Cu atoms can efficiently promote CO-CO coupling, as revealed by kinetic analyses. We extend the modeling to other typical Cu SACs and reveal that all of the Cu1 sites are inactive, while the C2+ performance of the derived Cu-cluster catalysts is substrate-dependent. This study offers mechanistic insights into Cu SACs and provides practical guidance for their rational optimization.
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Affiliation(s)
- Juan Zhang
- Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Wenyuan Road No. 1, Nanjing 210023, People's Republic of China
| | - Yu Wang
- Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Wenyuan Road No. 1, Nanjing 210023, People's Republic of China
| | - Yafei Li
- Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Wenyuan Road No. 1, Nanjing 210023, People's Republic of China
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6
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Pan F, Fang L, Li B, Yang X, O'Carroll T, Li H, Li T, Wang G, Chen KJ, Wu G. N and OH-Immobilized Cu 3 Clusters In Situ Reconstructed from Single-Metal Sites for Efficient CO 2 Electromethanation in Bicontinuous Mesochannels. J Am Chem Soc 2024; 146:1423-1434. [PMID: 38171910 DOI: 10.1021/jacs.3c10524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Cu-based catalysts hold promise for electrifying CO2 to produce methane, an extensively used fuel. However, the activity and selectivity remain insufficient due to the lack of catalyst design principles to steer complex CO2 reduction pathways. Herein, we develop a concept to design carbon-supported Cu catalysts by regulating Cu active sites' atomic-scale structures and engineering the carbon support's mesoscale architecture. This aims to provide a favorable local reaction microenvironment for a selective CO2 reduction pathway to methane. In situ X-ray absorption and Raman spectroscopy analyses reveal the dynamic reconstruction of nitrogen and hydroxyl-immobilized Cu3 (N,OH-Cu3) clusters derived from atomically dispersed Cu-N3 sites under realistic CO2 reduction conditions. The N,OH-Cu3 sites possess moderate *CO adsorption affinity and a low barrier for *CO hydrogenation, enabling intrinsically selective CO2-to-CH4 reduction compared to the C-C coupling with a high energy barrier. Importantly, a block copolymer-derived carbon fiber support with interconnected mesopores is constructed. The unique long-range mesochannels offer an H2O-deficient microenvironment and prolong the transport path for the CO intermediate, which could suppress the hydrogen evolution reaction and favor deep CO2 reduction toward methane formation. Thus, the newly developed catalyst consisting of in situ constructed N,OH-Cu3 active sites embedded into bicontinuous carbon mesochannels achieved an unprecedented Faradaic efficiency of 74.2% for the CO2 reduction to methane at an industry-level current density of 300 mA cm-2. This work explores effective concepts for steering desirable reaction pathways in complex interfacial catalytic systems via modulating active site structures at the atomic level and engineering pore architectures of supports on the mesoscale to create favorable microenvironments.
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Affiliation(s)
- Fuping Pan
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
- Chongqing Innovation Center, Northwestern Polytechnical University, Chongqing 401135, China
| | - Lingzhe Fang
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, United States
| | - Boyang Li
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Xiaoxuan Yang
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Thomas O'Carroll
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Haoyang Li
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Tao Li
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, United States
- Chemistry and Material Science Group, X-ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Guofeng Wang
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States
| | - Kai-Jie Chen
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Gang Wu
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
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Zhu HL, Huang JR, Zhang MD, Yu C, Liao PQ, Chen XM. Continuously Producing Highly Concentrated and Pure Acetic Acid Aqueous Solution via Direct Electroreduction of CO 2. J Am Chem Soc 2024; 146:1144-1152. [PMID: 38164902 DOI: 10.1021/jacs.3c12423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
It is crucial to achieve continuous production of highly concentrated and pure C2 chemicals through the electrochemical CO2 reduction reaction (eCO2RR) for artificial carbon cycling, yet it has remained unattainable until now. Despite one-pot tandem catalysis (dividing the eCO2RR to C2 into two catalytical reactions of CO2 to CO and CO to C2) offering the potential for significantly enhancing reaction efficiency, its mechanism remains unclear and its performance is unsatisfactory. Herein, we selected different CO2-to-CO catalysts and CO-to-acetate catalysts to construct several tandem catalytic systems for the eCO2RR to acetic acid. Among them, a tandem catalytic system comprising a covalent organic framework (PcNi-DMTP) and a metal-organic framework (MAF-2) as CO2-to-CO and CO-to-acetate catalysts, respectively, exhibited a faradaic efficiency of 51.2% with a current density of 410 mA cm-2 and an ultrahigh acetate yield rate of 2.72 mmol m-2 s-1 under neutral conditions. After electrolysis for 200 h, 1 cm-2 working electrode can continuously produce 20 mM acetic acid aqueous solution with a relative purity of 95+%. Comprehensive studies revealed that the performance of tandem catalysts is influenced not only by the CO supply-demand relationship and electron competition between the two catalytic processes in the one-pot tandem system but also by the performance of the CO-to-C2 catalyst under diluted CO conditions.
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Affiliation(s)
- Hao-Lin Zhu
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jia-Run Huang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510275, China
| | - Meng-Di Zhang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510275, China
| | - Can Yu
- Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
| | - Pei-Qin Liao
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510275, China
| | - Xiao-Ming Chen
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510275, China
- Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515021, China
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8
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Chang X, Xiong H, Lu Q, Xu B. Mechanistic Implications of Low CO Coverage on Cu in the Electrochemical CO and CO 2 Reduction Reactions. JACS AU 2023; 3:2948-2963. [PMID: 38034971 PMCID: PMC10685414 DOI: 10.1021/jacsau.3c00494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 10/05/2023] [Accepted: 10/05/2023] [Indexed: 12/02/2023]
Abstract
Electrochemical CO or CO2 reduction reactions (CO(2)RR), powered by renewable energy, represent one of the promising strategies for upgrading CO2 to valuable products. To design efficient and selective catalysts for the CO(2)RR, a comprehensive mechanistic understanding is necessary, including a comprehensive understanding of the reaction network and the identity of kinetically relevant steps. Surface-adsorbed CO (COad) is the most commonly reported reaction intermediate in the CO(2)RR, and its surface coverage (θCO) and binding energy are proposed to be key to the catalytic performance. Recent experimental evidence sugguests that θCO on Cu electrode at electrochemical conditions is quite low (∼0.05 monolayer), while relatively high θCO is often assumed in literature mechanistic discussion. This Perspective briefly summarizes existing efforts in determining θCO on Cu surfaces, analyzes mechanistic impacts of low θCO on the reaction pathway and catalytic performance, and discusses potential fruitful future directions in advancing our understanding of the Cu-catalyzed CO(2)RR.
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Affiliation(s)
- Xiaoxia Chang
- College
of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Haocheng Xiong
- Department
of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Qi Lu
- Department
of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Bingjun Xu
- College
of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
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