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Huang S, Chen T, Pei X, Sun P, Lv X, Sun X, Liu J, Leo Liu T. FePc Coupled with FeNi/WxC Embeded in Leaf like Multistage Pore Carbon as Highly Efficient Bifunctional Electrocatalyst for Long Life Zinc-air Battery. J Colloid Interface Sci 2025; 682:188-198. [PMID: 39616649 DOI: 10.1016/j.jcis.2024.11.100] [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: 09/21/2024] [Revised: 11/11/2024] [Accepted: 11/14/2024] [Indexed: 01/15/2025]
Abstract
The development of oxygen reduction/evolution reaction (ORR/OER) bifunctional electrocatalysts with excellent electrocatalytic activity and stability is critical for Zinc-air batteries (ZABs), but remains challenging. Herein, NiFe-WNC with abundant multistage pore structure was prepared by chemical bath deposition and pyrolysis. FePc@NiFe-WNC bifunctional electrocatalyst was obtained by coupling dispersed FePc on it at room temperature. Experimental and theoretical calculations indicate that the electron injection from pyridine nitrogen of NiFe-WNC into FePc regulates the electronic structure of FeNx active site and then enhances the ORR catalytic activity. On the other hand, the electronic structure modulation of NiFe alloy by tungsten carbide in NiFe-WNC improves its OER electrocatalytic performance. All these contribute to the excellent ORR/OER electrocatalytic performance of FePc@NiFe-WNC with half-wave potential of 0.911 V, small potential gap (ΔE = 0.67 V), and good durability. The corresponding liquid ZABs delivers a specific capacity of 818 mAh/gZn and a long cycle life of up to 5000 h. Its quasi-solid-state battery shows a peak power density of up to 441 mW/cm2, which can drive some electrical appliances, highlighting its extensive and safe application potential. This work offers a simple and feasible strategy to construct highly active and stable ORR/OER bifunctional electrocatalysts for developing high-performance ZABs.
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Affiliation(s)
- Shijian Huang
- College of Materials and Chemical Engineering, College of Mechanical and Power Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China; Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
| | - Ting Chen
- College of Materials and Chemical Engineering, College of Mechanical and Power Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China; Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
| | - Xinyuan Pei
- College of Materials and Chemical Engineering, College of Mechanical and Power Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China; Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
| | - Panpan Sun
- College of Materials and Chemical Engineering, College of Mechanical and Power Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China; Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
| | - Xiaowei Lv
- College of Materials and Chemical Engineering, College of Mechanical and Power Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China; Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
| | - Xiaohua Sun
- College of Materials and Chemical Engineering, College of Mechanical and Power Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, Yichang, 443002, China; Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China.
| | - Jinlong Liu
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
| | - T Leo Liu
- Department of Chemistry and Biochemistry, Utah State University, Logan, UT 84322, USA.
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2
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Basak A, Karmakar A, Dutta S, Roy D, Paul S, Nishiyama Y, Pathak B, Kundu S, Banerjee R. Metal-Free Electrocatalytic Alkaline Water Splitting by Porous Macrocyclic Proton Sponges. Angew Chem Int Ed Engl 2024:e202419377. [PMID: 39666665 DOI: 10.1002/anie.202419377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2024] [Revised: 12/12/2024] [Accepted: 12/12/2024] [Indexed: 12/14/2024]
Abstract
Macrocycles are unique as they encapsulate and transfer guest molecules or ions and facilitate catalytic processes. Although metalated macrocycles are pivotal in electrocatalytic processes, using metal-free analogs has been rare. Following the strategy of Kanbara et al., we synthesized an azacalixarene macrocycle-N, N', N''-tris(p-aminophenyl)azacalix[3](2,6)pyridine (CalixNH2). The macrocycle encapsulates a proton in its cavity, maintaining the protonation even in highly alkaline media. Notably, it retains almost 50 % protonated form in 1 M KOH (~pH 14)-acting as a proton sponge. As hydrogen evolution is complex in alkaline media owing to sluggish water dissociation, we implemented the proton sponge (CalixNH2) in an alkaline hydrogen evolution reaction. Conjugated Porous polymers, TpCalix and DhaCalix, have been synthesized from the triamine-CalixNH2. The most efficient catalyst, TpCalix, has shown excellent performance in alkaline HER and OER in 1 M KOH (~pH 14), with low overpotentials of only 112(±2) and 290(±2) mV at 10 mA cm-2, respectively, and durable up to 24 hours. A full-cell reaction using TpCalix in both the cathode and anode exhibited a low full-cell voltage of 1.73 V and was stable for 12 hours. DFT calculations verified the tripyridinic core, which acts as the principal site for proton abstraction and binding.
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Affiliation(s)
- Ananda Basak
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Arun Karmakar
- Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu 630003, India
| | - Sayantani Dutta
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Diptendu Roy
- Department of Chemistry, Indian Institute of Technology Indore, Indore, 453552, India
| | - Satyadip Paul
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | | | - Biswarup Pathak
- Department of Chemistry, Indian Institute of Technology Indore, Indore, 453552, India
| | - Subrata Kundu
- Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
- Electrochemical Process Engineering (EPE) Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu 630003, India
| | - Rahul Banerjee
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
- College of Science, Korea University, 145 Anam-ro, 02841, Seongbuk-gu, South Korea
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3
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Zeng T, Chen J, Yu ZH, Tse ECM. CuFe Cooperativity at the Membrane-Electrode Interface Elicits a Tandem 2e -+2e - Mechanism for Exclusive O 2-To-H 2O Electroreduction. J Am Chem Soc 2024; 146:31757-31767. [PMID: 39405398 PMCID: PMC11583977 DOI: 10.1021/jacs.4c10625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2024]
Abstract
High O2 reduction reaction (ORR) kinetics and exclusive 4e- pathway selectivity are keys to realizing a sustainable society. However, nonprecious electrocatalysts at present cannot enhance the ORR turnover frequency and H2O Faradaic efficiency (FE) concurrently. To address these two challenges, hybrid bilayer membrane (HBM) electrodes with earth-abundant metal centers are developed to control proton-coupled electron transfer (PCET) in ORR. Here, an oxidase-inspired CuFe active site is supported on a tris(2-pyridylmethyl)amine HBM and explored as a unique interface for efficient ORR. This bimetallic HBM displayed an ORR activity 1.4 times higher than the monometallic systems and exhibited the highest FE for H2O (∼94%) among Cu-, Fe-, Ni-, and Co-based HBMs. Contrary to previous studies where the ORR current decreases upon embedding the metal center in a hydrophobic lipid environment, here, the incorporation of a nitrile-terminated proton carrier at the HBM interface boosts the ORR current by 1.7 folds relative to the case where the catalytic site is directly exposed to protons in solution. This intriguing dual improvement is supported by density function theory calculations where an additional 2e-+2e- mechanism occurs in parallel to the direct 4e- pathway, highlighting the synergistic effect of the CuFe HBM for facilitating high-performance ORR. A Zn-air battery is constructed using this CuFe HBM for the first time, further demonstrating that the knowledge gained from this HBM technology holds practical values in real-life applications. These findings on interfacial PCET are envisioned to spark new design principles for future catalysts with optimal electrochemical properties for advanced energy conversion schemes.
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Affiliation(s)
- Tian Zeng
- Department of Chemistry, HKU-CAS Joint Laboratory on New Materials, University of Hong Kong, Hong Kong SAR, Hong Kong
| | - Jiu Chen
- Department of Chemistry, HKU-CAS Joint Laboratory on New Materials, University of Hong Kong, Hong Kong SAR, Hong Kong
| | - Zuo Hang Yu
- Department of Chemistry, HKU-CAS Joint Laboratory on New Materials, University of Hong Kong, Hong Kong SAR, Hong Kong
| | - Edmund C M Tse
- Department of Chemistry, HKU-CAS Joint Laboratory on New Materials, University of Hong Kong, Hong Kong SAR, Hong Kong
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4
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Huang Z, Li M, Yang X, Zhang T, Wang X, Song W, Zhang J, Wang H, Chen Y, Ding J, Hu W. Diatomic Iron with a Pseudo-Phthalocyanine Coordination Environment for Highly Efficient Oxygen Reduction over 150,000 Cycles. J Am Chem Soc 2024; 146:24842-24854. [PMID: 39186017 DOI: 10.1021/jacs.4c05111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/27/2024]
Abstract
Atomically dispersed Fe-N-C catalysts emerged as promising alternatives to commercial Pt/C for the oxygen reduction reaction. However, the majority of Fe-N-C catalysts showed unsatisfactory activity and durability due to their inferior O-O bond-breaking capability and rapid Fe demetallization. Herein, we create a pseudo-phthalocyanine environment coordinated diatomic iron (Fe2-pPc) catalyst by grafting the core domain of iron phthalocyanine (Fe-Nα-Cα-Nβ) onto defective carbon. In situ characterizations and theoretical calculation confirm that Fe2-pPc follows the fast-kinetic dissociative pathway, whereby Fe2-pPc triggers bridge-mode oxygen adsorption and catalyzes direct O-O radical cleavage. Compared to traditional Fe-N-C and FePc-based catalysts exhibiting superoxo-like oxygen adsorption and an *OOH-involved pathway, Fe2-pPc delivers a superior half-wave potential of 0.92 V. Furthermore, the ultrastrong Nα-Cα bonds in the pPc environment endow the diatomic iron active center with high tolerance for reaction-induced geometric stress, leading to significantly promoted resistance to demetallization. Upon an unprecedented harsh accelerated degradation test of 150,000 cycles, Fe2-pPc experiences negligible Fe loss and an extremely small activity decay of 17 mV, being the most robust candidate among previously reported Fe-N-C catalysts. Zinc-air batteries employing Fe2-pPc exhibit a power density of 255 mW cm-2 and excellent operation stability beyond 440 h. This work brings new insights into the design of atomically precise metallic catalysts.
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Affiliation(s)
- Zechuan Huang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Mianfeng Li
- School of Materials Science and Engineering, Hainan University, Haikou 570228, China
| | - Xinyi Yang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Tao Zhang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Xin Wang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Wanqing Song
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Jinfeng Zhang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Haozhi Wang
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
- School of Materials Science and Engineering, Hainan University, Haikou 570228, China
| | - Yanan Chen
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Jia Ding
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
| | - Wenbin Hu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300350, China
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
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5
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Dutt S, Kottaichamy AR, Dargily NC, Mukhopadhyay S, Nayak B, Devendrachari MC, Vinod CP, Nimbegondi Kotresh HM, Ottakam Thotiyl M. Switchable molecular electrocatalysis. Chem Sci 2024; 15:13262-13270. [PMID: 39183932 PMCID: PMC11339944 DOI: 10.1039/d4sc01284d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Accepted: 07/04/2024] [Indexed: 08/27/2024] Open
Abstract
We demonstrate a switchable electrocatalysis mechanism modulated by hydrogen bonding interactions in ligand geometries. By manipulating these geometries, specific electrochemical processes at a single catalytic site can be selectively and precisely activated or deactivated. The α geometry enhances dioxygen electroreduction (ORR) while inhibiting protium redox processes, with the opposite effect seen in the β geometry. Intramolecular hydrogen bonding in the α geometry boosts electron density at the catalytic center, facilitating a shift of ORR to a 4-electron pathway. Conversely, the β geometry promotes a 2-electron ORR and facilitates electrocatalytic hydrogen evolution through an extensive proton charge assembly; offering a paradigm shift to conventional electrocatalytic principles. The expectations that ligand geometry induced electron density modulations in the catalytic metal centre would have a comparable impact on both ORR and HER has been questioned due to the contrasting reactivity exhibited by α-geometry and β-geometry molecules. This further emphasizes the complex and intriguing nature of the roles played by ligands in molecular electrocatalysis.
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Affiliation(s)
- Shifali Dutt
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune Dr Homi Bhabha Road, Pashan Pune 411008 Maharashtra India
| | - Alagar Raja Kottaichamy
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune Dr Homi Bhabha Road, Pashan Pune 411008 Maharashtra India
- Department of Chemistry, Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev Beer-Sheva 8410501 Israel
| | - Neethu Christudas Dargily
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune Dr Homi Bhabha Road, Pashan Pune 411008 Maharashtra India
| | - Sanchayita Mukhopadhyay
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune Dr Homi Bhabha Road, Pashan Pune 411008 Maharashtra India
| | - Bhojkumar Nayak
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune Dr Homi Bhabha Road, Pashan Pune 411008 Maharashtra India
| | | | | | | | - Musthafa Ottakam Thotiyl
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Pune Dr Homi Bhabha Road, Pashan Pune 411008 Maharashtra India
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6
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Putnam ST, Rodríguez-López J. Real-time investigation of reactive oxygen species and radicals evolved from operating Fe-N-C electrocatalysts during the ORR: potential dependence, impact on degradation, and structural comparisons. Chem Sci 2024; 15:10036-10045. [PMID: 38966386 PMCID: PMC11220586 DOI: 10.1039/d4sc01553c] [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: 03/05/2024] [Accepted: 05/28/2024] [Indexed: 07/06/2024] Open
Abstract
Improving the stability of platinum-group-metal-free (PGM-free) catalysts is a critical roadblock to the development of economically feasible energy storage and conversion technologies. Fe-N-C catalysts, the most promising class of PGM-free catalysts, suffer from rapid degradation. The generation of reactive oxygen species (ROS) during the oxygen reduction reaction (ORR) has been proposed as a central cause of this loss of activity. However, there is insufficient understanding of the generation and dynamics of ROS under catalytic conditions due to the difficulty of detecting and quantifying short-lived ROS such as the hydroxyl radical, OH˙. To accomplish this, we use operando scanning electrochemical microscopy (SECM) to probe the production of radicals by a commercial pyrolyzed Fe-N-C catalyst in real-time using a redox-active spin trap methodology. SECM showed the monotonic production of OH˙ which followed the ORR activity. Our results were thoroughly backed using electron spin resonance confirmation to show that the hydroxyl radical is the dominant radical species produced. Furthermore, OH˙ and H2O2 production followed distinct trends. ROS studied as a function of catalyst degradation also showed a decreased production, suggesting its relation to the catalytic activity of the sample. The structural origins of ROS production were also probed using model systems such as iron phthalocyanine (FePc) and Fe3O4 nanoparticles, both of which showed significant generation of OH˙ during the ORR. These results provide a comprehensive insight into the critical, yet under-studied, aspects of the production and effects of ROS on electrocatalytic systems and open the door for further mechanistic and kinetic investigation using SECM.
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Affiliation(s)
- Seth T Putnam
- Department of Chemistry, University of Illinois Urbana-Champaign 600 S. Matthews Ave. Urbana IL 61801 USA
| | - Joaquín Rodríguez-López
- Department of Chemistry, University of Illinois Urbana-Champaign 600 S. Matthews Ave. Urbana IL 61801 USA
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Zhang Y, Offenhäusser A, Mourzina Y. A Study on the Mechanism and Properties of a Self-Powered H 2O 2 Electrochemical Sensor Based on a Fuel Cell Configuration with FePc and Graphene Cathode Catalyst Materials. BIOSENSORS 2024; 14:290. [PMID: 38920594 PMCID: PMC11202192 DOI: 10.3390/bios14060290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 05/21/2024] [Accepted: 05/31/2024] [Indexed: 06/27/2024]
Abstract
Conventional electrochemical sensors use voltammetric and amperometric methods with external power supply and modulation systems, which hinder the flexibility and application of the sensors. To avoid the use of an external power system and to minimize the number of electrochemical cell components, a self-powered electrochemical sensor (SPES) for hydrogen peroxide was investigated here. Iron phthalocyanine, an enzyme mimetic material, and Ni were used as a cathode catalyst and an anode material, respectively. The properties of the iron phthalocyanine catalyst modified by graphene nanoplatelets (GNPs) were investigated. Open circuit potential tests demonstrated the feasibility of this system. The GNP-modulated interface helped to solve the problems of aggregation and poor conductivity of iron phthalocyanine and allowed for the achievement of the best analytical characteristics of the self-powered H2O2 sensor with a low detection limit of 0.6 µM and significantly higher sensitivity of 0.198 A/(M·cm2) due to the enhanced electrochemical properties. The SPES demonstrated the best performance at pH 3.0 compared to pH 7.4 and 12.0. The sensor characteristics under the control of external variable load resistances are discussed and the cell showed the highest power density of 65.9 μW/cm2 with a 20 kOhm resistor. The practical applicability of this method was verified by the determination of H2O2 in blood serum.
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Affiliation(s)
| | | | - Yulia Mourzina
- Institute of Biological Information Processing—Bioelectronics (IBI-3), Forschungszentrum Jülich, 52425 Jülich, Germany; (Y.Z.); (A.O.)
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8
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Zhu W, Liu S, Huang R, Su Y, Huang K, He Z. Enhancing CO 2 Electroreduction to C2 Products on Metal-Nitrogen Sites by Regulating H 2O Dissociation. ACS APPLIED MATERIALS & INTERFACES 2024; 16:26316-26324. [PMID: 38717337 DOI: 10.1021/acsami.4c04752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2024]
Abstract
Water dissociation remarkably affects the CO2 reduction to CO and HCOOH, but whether it is effective for two-carbon product formation on M-Nx-containing catalysts is still ambiguous. Herein, by using a fluorinated metal phthalocyanine (MPc-F) as the M-N4-based model electrocatalyst, experimental and theoretical results reveal that the H2O-dissociation-induced active H species decrease the overpotential of the *CO hydrogenation to *CHO and facilitate the C-C coupling between *CHO and neighboring CO. Such an effect is strengthened by an increase in the *CO binding strength on the metal center. By introducing CuPc as the H2O dissociation catalyst into MPc-F (MPc-F/CuPc) to accurately regulate the H2O dissociation, the faradic efficiency of C2 products on FePc-F/CuPc and MnPc-F/CuPc increases from 0% (FePc-F and MnPc-F) to 26 and 36%, respectively. This work develops a novel strategy for enhancing the selectivity of M-Nx-containing catalysts to C2 products and reveals the correlation between H2O dissociation and C2 product formation.
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Affiliation(s)
- Weiwei Zhu
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, P. R. China
| | - Suqin Liu
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, P. R. China
- Hunan Provincial Key Laboratory of Chemical Power Sources, Central South University, Changsha 410083, Hunan, P. R. China
| | - Rongjiao Huang
- School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Yuke Su
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, P. R. China
| | - Kui Huang
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, P. R. China
| | - Zhen He
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, P. R. China
- Hunan Provincial Key Laboratory of Chemical Power Sources, Central South University, Changsha 410083, Hunan, P. R. China
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9
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Shu C, Zhang W, Zhan J, Yu F. Anchoring covalent organic polymers on supports with tunable functional groups boosting the oxygen reduction performance under pH-universal conditions. J Colloid Interface Sci 2024; 661:923-929. [PMID: 38330664 DOI: 10.1016/j.jcis.2024.01.218] [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: 12/15/2023] [Revised: 01/29/2024] [Accepted: 01/31/2024] [Indexed: 02/10/2024]
Abstract
Iron phthalocyanine (FePc) is an attractive nonprecious metal candidate for electrocatalytic oxygen reduction reaction (ORR). However, its low catalytic performance under acidic and neutral conditions limits its practical application. Herein, the FePc-based covalent organic polymers (COPFePc) polymerized in situ on the functionalized multiwalled carbon nanotubes (R-MWCNT) containing different electron-withdrawing or electron-donating groups (COPFePc/R-MWCNT, R = COOH, OH or NH2) were synthesized for ORR. Among them, COPFePc/COOH-MWCNT exhibited the best ORR performance under pH-universal conditions (acidic, neutral, and alkaline). Density-functional theory (DFT) calculations demonstrate that the electron-withdrawing or electron-donating effect of the functional groups in COPFePc/R-MWCNT causes charge redistribution of the active center Fe. The COOH functional group with an electron-withdrawing ability shifts the d-band center of Fe away from the Fermi energy level and reduces the binding strength of oxygen-containing intermediates, accelerating the ORR kinetics and optimizing the catalytic activity.
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Affiliation(s)
- Chonghong Shu
- National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Wenlin Zhang
- National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, PR China.
| | - Jiayu Zhan
- National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Fengshou Yu
- National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, PR China.
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10
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Lv XH, Xu X, Zhao KM, Zhou ZY, Wang YC, Sun SG. The Lifetime of Hydroxyl Radical in Realistic Fuel Cell Catalyst Layer. CHEMSUSCHEM 2024; 17:e202301428. [PMID: 38302692 DOI: 10.1002/cssc.202301428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 01/02/2024] [Accepted: 01/29/2024] [Indexed: 02/03/2024]
Abstract
The lifetime of hydroxyl radicals (⋅OH) in the fuel cell catalyst layer remains uncertain, which hampers the comprehension of radical-induced degradation mechanisms and the development of longevity strategies for proton-exchange membrane fuel cells (PEMFCs). In this study, we have precisely determined that the lifetime of ⋅OH radicals can extend up to several seconds in realistic fuel cell catalyst layers. This finding reveals that ⋅OH radicals are capable of carrying out long-range attacks spanning at least a few centimeters during PEMFCs operation. Such insights hold great potential for enhancing our understanding of radical-mediated fuel cell degradation processes and promoting the development of durable fuel cell devices.
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Affiliation(s)
- Xue-Hui Lv
- College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, 361005, Xiamen, P. R. China
| | - Xia Xu
- College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, 361005, Xiamen, P. R. China
| | - Kuang-Min Zhao
- College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, 361005, Xiamen, P. R. China
| | - Zhi-You Zhou
- College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, 361005, Xiamen, P. R. China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), 361005, Xiamen, P. R. China
| | - Yu-Cheng Wang
- College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, 361005, Xiamen, P. R. China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), 361005, Xiamen, P. R. China
| | - Shi-Gang Sun
- College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, 361005, Xiamen, P. R. China
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