1
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Ezhov R, Bury G, Maximova O, Grant ED, Kondo M, Masaoka S, Pushkar Y. Pentanuclear iron complex for water oxidation: spectroscopic analysis of reactive intermediates in solution and catalyst immobilization into the MOF-based photoanode. J Catal 2024; 429:115230. [PMID: 38187083 PMCID: PMC10769158 DOI: 10.1016/j.jcat.2023.115230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Photoelectrochemical water splitting can produce green hydrogen for industrial use and CO2-neutral transportation, ensuring the transition from fossil fuels to green, renewable energy sources. The iron-based electrocatalyst [FeII4FeIII(μ-3-O)(μ-L)6]3+ (LH = 3,5-bis(2-pyridyl)pyrazole) (1), discovered in 2016, is one of the fastest molecular water oxidation catalysts (WOC) based on earth-abundant elements. However, its water oxidation reaction mechanism has not been yet fully elucidated. Here, we present in situ X-ray spectroscopy and electron paramagnetic resonance (EPR) analysis of electrochemical water oxidation reaction (WOR) promoted by (1) in water-acetonitrile solution. We observed transient reactive intermediates during the in situ electrochemical WOR, consistent with a coordination sphere expansion prior to the onset of catalytic current. At a pre-catalytic (~+1.1 V vs. Ag/AgCl) potential, the distinct g~2.0 EPR signal assigned to FeIII/FeIV interaction was observed. Prolonged bulk electrolysis at catalytic (~+1.6 V vs. Ag/AgCl) potential leads to the further oxidation of Fe centers in (1). At the steady state achieved with such electrolysis, the formation of hypervalent FeV=O and FeIV=O catalytic intermediates was inferred with XANES and EXAFS fitting, detecting a short Fe=O bond at ~1.6 Å. (1) was embedded into MIL-126 MOF with the formation of (1)-MIL-126 composite. The latter was tested in photoelectrochemical WOR and demonstrated an improvement of electrocatalytic current upon visible light irradiation in acidic (pH=2) water solution. The presented spectroscopic analysis gives further insight into the catalytic pathways of multinuclear systems and should help the subsequent development of more energy- and cost-effective catalysts of water splitting based on earth-abundant metals. Photoelectrocatalytic activity of (1)-MIL-126 confirms the possibility of creating an assembly of (1) inside a solid support and boosting it with solar irradiation towards industrial applications of the catalyst.
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Affiliation(s)
- Roman Ezhov
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 USA
| | - Gabriel Bury
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 USA
| | - Olga Maximova
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 USA
| | - Elliot Daniel Grant
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 USA
| | - Mio Kondo
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shigeyuki Masaoka
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yulia Pushkar
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 USA
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2
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Taseska T, Yu W, Wilsey MK, Cox CP, Meng Z, Ngarnim SS, Müller AM. Analysis of the Scale of Global Human Needs and Opportunities for Sustainable Catalytic Technologies. Top Catal 2023; 66:338-374. [PMID: 37025115 PMCID: PMC10007685 DOI: 10.1007/s11244-023-01799-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/20/2023] [Indexed: 03/13/2023]
Abstract
AbstractWe analyzed the enormous scale of global human needs, their carbon footprint, and how they are connected to energy availability. We established that most challenges related to resource security and sustainability can be solved by providing distributed, affordable, and clean energy. Catalyzed chemical transformations powered by renewable electricity are emerging successor technologies that have the potential to replace fossil fuels without sacrificing the wellbeing of humans. We highlighted the technical, economic, and societal advantages and drawbacks of short- to medium-term decarbonization solutions to gauge their practicability, economic feasibility, and likelihood for widespread acceptance on a global scale. We detailed catalysis solutions that enhance sustainability, along with strategies for catalyst and process development, frontiers, challenges, and limitations, and emphasized the need for planetary stewardship. Electrocatalytic processes enable the production of solar fuels and commodity chemicals that address universal issues of the water, energy and food security nexus, clothing, the building sector, heating and cooling, transportation, information and communication technology, chemicals, consumer goods and services, and healthcare, toward providing global resource security and sustainability and enhancing environmental and social justice.
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Affiliation(s)
- Teona Taseska
- Department of Chemical Engineering, University of Rochester, 14627 Rochester, NY USA
| | - Wanqing Yu
- Department of Chemical Engineering, University of Rochester, 14627 Rochester, NY USA
| | | | - Connor P. Cox
- Materials Science Program, University of Rochester, 14627 Rochester, NY USA
| | - Ziyi Meng
- Materials Science Program, University of Rochester, 14627 Rochester, NY USA
| | - Soraya S. Ngarnim
- Department of Chemistry, University of Rochester, 14627 Rochester, NY USA
| | - Astrid M. Müller
- Department of Chemical Engineering, University of Rochester, 14627 Rochester, NY USA
- Materials Science Program, University of Rochester, 14627 Rochester, NY USA
- Department of Chemistry, University of Rochester, 14627 Rochester, NY USA
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3
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Keane TP, Veroneau SS, Hartnett AC, Nocera DG. Generation of Pure Oxygen from Briny Water by Binary Catalysis. J Am Chem Soc 2023; 145:4989-4993. [PMID: 36848225 DOI: 10.1021/jacs.3c00176] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Whereas the emphasis of water splitting is typically on hydrogen generation, there is value in the oxygen produced, especially in the undersea environment and for medicinal applications in the developing world. The generation of pure and breathable oxygen from abundant and accessible sources of water, such as brine and seawater, is challenging owing to the prevalence of the competing halide oxidation reaction to produce halogen and hypohalous acids. We show here that pure O2 may be generated from briny water by using an oxygen evolution catalyst with an overlayer that fulfills the criteria of (i) possessing a point of zero charge that results in halide anion rejection and (ii) promoting the disproportionation of hypohalous acids.
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Affiliation(s)
- Thomas P Keane
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Samuel S Veroneau
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Alaina C Hartnett
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
| | - Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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Komiya H, Shinagawa T, Takanabe K. Electrolyte Engineering for Oxygen Evolution Reaction Over Non-Noble Metal Electrodes Achieving High Current Density in the Presence of Chloride Ion. CHEMSUSCHEM 2022; 15:e202201088. [PMID: 35921042 PMCID: PMC9804667 DOI: 10.1002/cssc.202201088] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/17/2022] [Indexed: 06/15/2023]
Abstract
Direct seawater electrolysis potentially simplifies the electrolysis process and leads to a decrease in the cost of green hydrogen production. However, impurities present in the seawater, especially chloride ions (Cl- ), cause corrosion of the electrode material, and its oxidation competes with the anodic oxygen evolution reaction (OER). By carefully tuning electrode substrate and electrolyte solutions, the CoFeOx Hy /Ti electrode with high double-layer capacitance actively and stably electro-catalyzed the OER in potassium borate solutions at pH 9.2 in the presence of 0.5 mol kg-1 Cl- . The electrode possesses an active site motif composed of either a Co- or Fe-domain and benefits from an enlarged surface area. Selective OER was demonstrated in Cl- -containing electrolyte solutions at an elevated reaction temperature, stably achieving 500 mA cm-2 at a mere potential of 1.67 V vs. reversible hydrogen electrode (RHE) at 353 K for multiple on-off and long-term testing processes with a faradaic efficiency of unity toward the OER.
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Affiliation(s)
- Hiroki Komiya
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyoJapan
| | - Tatsuya Shinagawa
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyoJapan
| | - Kazuhiro Takanabe
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyoJapan
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5
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Liu J, Duan S, Shi H, Wang T, Yang X, Huang Y, Wu G, Li Q. Rationally Designing Efficient Electrocatalysts for Direct Seawater Splitting: Challenges, Achievements, and Promises. Angew Chem Int Ed Engl 2022; 61:e202210753. [DOI: 10.1002/anie.202210753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Jianyun Liu
- State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China
- Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000 China
| | - Shuo Duan
- State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China
| | - Hao Shi
- State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China
| | - Tanyuan Wang
- State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China
- Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000 China
| | - Xiaoxuan Yang
- Department of Chemical and Biological Engineering University at Buffalo The State University of New York Buffalo NY 14260 USA
| | - Yunhui Huang
- State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China
| | - Gang Wu
- Department of Chemical and Biological Engineering University at Buffalo The State University of New York Buffalo NY 14260 USA
| | - Qing Li
- State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China
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6
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Capilli G, Chen Y, Szkopek T, Cerruti M. Selective Catalytic Electro-Oxidation of Water with Cobalt Oxide in Ion Impermeable Reduced Graphene Oxide Porous Electrodes. ACS NANO 2022; 16:12488-12499. [PMID: 35921169 DOI: 10.1021/acsnano.2c03877] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The direct electrolysis of seawater is greatly inhibited by the oxidation of Cl- to free chlorine, an undesirable, corrosive byproduct. To suppress the parasitic interference of Cl- and any other ion, we developed a freestanding, electrically conducting, 3D macroporous reduced graphene oxide (rGO) scaffold with cobalt oxide particles selectively deposited on the internal walls of its closed pores (with an average diameter of ∼180 μm). The pore walls act as membranes composed of stacked rGO flakes; the nanochannels between rGO layers (size <1 nm) are permeable to water and gases while preventing the diffusion of dissolved ions such as Cl-. Due to this, the catalytic particles are selectively accessible to water molecules but not to ions, allowing electrolysis to occur without chlorine evolution. The electrodes developed exhibit a stable generation of O2 from simulated seawater at pH 14, reaching a specific current density of up to 25 A g-1 during continuous electrolysis with 89-98% Faradaic efficiency, while chlorine generation is below 6 ppm h-1, the sensitivity limit of the detection method employed. The strategy here proposed can be generalized to build electrodes that are inherently selective thanks to their architecture, with catalytically active particles loaded into closed pores with selective ion transport properties.
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Affiliation(s)
- Gabriele Capilli
- Department of Materials Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
| | - Yiwen Chen
- Department of Materials Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
| | - Thomas Szkopek
- Department of Electrical and Computer Engineering, McGill University, Montreal, Québec H3A 0E9, Canada
| | - Marta Cerruti
- Department of Materials Engineering, McGill University, Montreal, Québec H3A 0C5, Canada
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7
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Liu J, Duan S, Shi H, Wang T, Yang X, Huang Y, Wu G, Li Q. Rationally Designing Efficient Electrocatalysts for Direct Seawater Splitting: Challenges, Achievements, and Promises. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202210753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jianyun Liu
- Huazhong University of Science and Technology School of Materials Science and Engineering CHINA
| | - Shuo Duan
- Huazhong University of Science and Technology School of Materials Science and Engineering CHINA
| | - Hao Shi
- Huazhong University of Science and Technology School of Materials Science and Engineering CHINA
| | - Tanyuan Wang
- Huazhong University of Science and Technology School of Materials Science and Engineering CHINA
| | - Xiaoxuan Yang
- State University of New York at Buffalo: University at Buffalo Department of Chemical and Biological Engineering UNITED STATES
| | - Yunhui Huang
- Huazhong University of Science and Technology School of Materials Science and Engineering CHINA
| | - Gang Wu
- State University of New York at Buffalo: University at Buffalo Department of Chemical and Biological Engineering 309 Furnas Hall 14260 Buffalo UNITED STATES
| | - Qing Li
- Huazhong University of Science and Technology School of Materials Science and Engineering CHINA
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8
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Seawater electrolysis technologies for green hydrogen production: challenges and opportunities. Curr Opin Chem Eng 2022. [DOI: 10.1016/j.coche.2022.100827] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Xiao X, Yang L, Sun W, Chen Y, Yu H, Li K, Jia B, Zhang L, Ma T. Electrocatalytic Water Splitting: From Harsh and Mild Conditions to Natural Seawater. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2105830. [PMID: 34878210 DOI: 10.1002/smll.202105830] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/20/2021] [Indexed: 06/13/2023]
Abstract
Electrocatalytic water splitting is regarded as the most effective pathway to generate green energy-hydrogen-which is considered as one of the most promising clean energy solutions to the world's energy crisis and climate change mitigation. Although electrocatalytic water splitting has been proposed for decades, large-scale industrial hydrogen production is hindered by high electricity cost, capital investment, and electrolysis media. Harsh conditions (strong acid/alkaline) are widely used in electrocatalytic mechanism studies, and excellent catalytic activities and efficiencies have been achieved. However, the practical application of electrocatalytic water splitting in harsh conditions encounters several obstacles, such as corrosion issues, catalyst stability, and membrane technical difficulties. Thus, the research on water splitting in mild conditions (neutral/near neutral), even in natural seawater, has aroused increasing attention. However, the mechanism in mild conditions or natural seawater is not clear. Herein, different conditions in electrocatalytic water splitting are reviewed and the effects and proposed mechanisms in the three conditions are summarized. Then, a comparison of the reaction process and the effects of the ions in different electrolytes are presented. Finally, the challenges and opportunities associated with direct electrocatalytic natural seawater splitting and the perspective are presented to promote the progress of hydrogen production by water splitting.
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Affiliation(s)
- Xue Xiao
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Lijun Yang
- Institute of Clean Energy Chemistry, Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, 66 Chongshan Middle Road, Shenyang, 110036, China
| | - Wenping Sun
- School of Materials Science and Engineering, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
| | - Yu Chen
- Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (MOE), Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, Shaanxi, 710062, China
| | - Hai Yu
- CSIRO Energy, 10 Murray Dwyer Circuit, Mayfield West, NSW, 2304, Australia
| | - Kangkang Li
- CSIRO Energy, 10 Murray Dwyer Circuit, Mayfield West, NSW, 2304, Australia
| | - Baohua Jia
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
| | - Lei Zhang
- College of Chemistry, Liaoning University, 66 Chongshan Middle Road, Shenyang, 110036, China
| | - Tianyi Ma
- Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia
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10
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Nocera DG. Proton-Coupled Electron Transfer: The Engine of Energy Conversion and Storage. J Am Chem Soc 2022; 144:1069-1081. [PMID: 35023740 DOI: 10.1021/jacs.1c10444] [Citation(s) in RCA: 52] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Proton-coupled electron transfer (PCET) underpins energy conversion in chemistry and biology. Four energy systems are described whose discoveries are based on PCET: the water splitting chemistry of the Artificial Leaf, the carbon fixation chemistry of the Bionic Leaf-C, the nitrogen fixation chemistry of the Bionic Leaf-N and the Coordination Chemistry Flow Battery (CCFB). Whereas the Artificial Leaf, Bionic Leaf-C, and Bionic Leaf-N require strong coupling between electron and proton to reduce energetic barriers to enable high energy efficiencies, the CCFB requires complete decoupling of the electron and proton so as to avoid parasitic energy-wasting reactions. The proper design of PCET in these systems facilitates their implementation in the areas of (i) centralized large scale grid storage of electricity and (ii) decentralized energy storage/conversion using only sunlight, air and any water source to produce fuel and food within a sustainable cycle for the biogenic elements of C, N and P.
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Affiliation(s)
- Daniel G Nocera
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, United States
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11
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Hegner FS, Garcés-Pineda FA, González-Cobos J, Rodríguez-García B, Torréns M, Palomares E, López N, Galán-Mascarós JR. Understanding the Catalytic Selectivity of Cobalt Hexacyanoferrate toward Oxygen Evolution in Seawater Electrolysis. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03502] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Franziska S. Hegner
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Felipe A. Garcés-Pineda
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Jesús González-Cobos
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Barbara Rodríguez-García
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Mabel Torréns
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - Emilio Palomares
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | - Núria López
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
| | - José-Ramón Galán-Mascarós
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology (BIST), Avinguda Països Catalans 16, 43007 Tarragona, Spain
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
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12
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Chang J, Wang G, Yang Y. Recent Advances in Electrode Design for Rechargeable Zinc–Air Batteries. SMALL SCIENCE 2021. [DOI: 10.1002/smsc.202100044] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Jinfa Chang
- NanoScience Technology Center University of Central Florida 12424 Research Parkway Suite 423 Orlando FL 32826 USA
| | - Guanzhi Wang
- NanoScience Technology Center University of Central Florida 12424 Research Parkway Suite 423 Orlando FL 32826 USA
- Department of Materials Science and Engineering University of Central Florida Orlando FL 32826 USA
| | - Yang Yang
- NanoScience Technology Center University of Central Florida 12424 Research Parkway Suite 423 Orlando FL 32826 USA
- Department of Materials Science and Engineering University of Central Florida Orlando FL 32826 USA
- Department of Chemistry Renewable Energy and Chemical Transformation Cluster University of Central Florida Orlando FL 32826 USA
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13
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Abe H, Murakami A, Tsunekawa S, Okada T, Wakabayashi T, Yoshida M, Nakayama M. Selective Catalyst for Oxygen Evolution in Neutral Brine Electrolysis: An Oxygen-Deficient Manganese Oxide Film. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05496] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hikaru Abe
- Nakabohtec Corrosion Protecting Co., Ltd., Ageo 362-0052, Japan
| | - Ai Murakami
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | - Shun Tsunekawa
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | - Takuya Okada
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | | | - Masaaki Yoshida
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
- Blue Energy Center for SGE Technology (BEST), Ube 755-8611, Japan
| | - Masaharu Nakayama
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
- Blue Energy Center for SGE Technology (BEST), Ube 755-8611, Japan
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14
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Continuous electrochemical water splitting from natural water sources via forward osmosis. Proc Natl Acad Sci U S A 2021; 118:2024855118. [PMID: 33619109 DOI: 10.1073/pnas.2024855118] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Electrochemical water splitting stores energy as equivalents of hydrogen and oxygen and presents a potential route to the scalable storage of renewable energy. Widespread implementation of such energy storage, however, will be facilitated by abundant and accessible sources of water. We describe herein a means of utilizing impure water sources (e.g., saltwater) for electrochemical water splitting by leveraging forward osmosis. A concentration gradient induces the flow of water from an impure water source into a more concentrated designed electrolyte. This concentration gradient may subsequently be maintained by water splitting, where rates of water influx (i.e., forward osmosis) and effective outflux (i.e., water splitting) are balanced. This approach of coupling forward osmosis to water splitting allows for the use of impure and natural sources without pretreatment and with minimal losses in energy efficiency.
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16
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Okada T, Abe H, Murakami A, Shimizu T, Fujii K, Wakabayashi T, Nakayama M. A Bilayer Structure Composed of Mg|Co-MnO 2 Deposited on a Co(OH) 2 Film to Realize Selective Oxygen Evolution from Chloride-Containing Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5227-5235. [PMID: 32347730 DOI: 10.1021/acs.langmuir.0c00547] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A fluorine-doped tin oxide-coated glass electrode modified with a bilayer film of underlying α-Co(OH)2 and overlying Mg-intercalated and Co-doped δ-type (layered) MnO2 (Mg|Co-MnO2) preferentially yielded oxygen with a Faradaic efficiency as high as 79% in the presence of chloride ions at high concentration (0.5 M). This noble metal-free electrode was fabricated by cathodic electrolysis of aqueous Co(NO3)2 followed by anodic electrolysis of a mixture of Mn2+, Co2+, and cetyltrimethylammonium (CTA+) ions in water. The CTA+ ions accommodated in the interlayer spaces of Co-doped δ-MnO2 were replaced with Mg2+ by ion exchange. The upper Mg|Co-MnO2 could effectively block the permeation of Cl- ions and allow only H2O and O2, while the under α-Co(OH)2 acted as an oxidation catalyst for the H2O penetrated through the upper coating. Thus, the oxygen evolution reaction (OER) was preferred to the chlorine evolution reaction (CER). In artificial seawater (pH 8.3), the blocking effect against Cl- decreased because of ion exchange of the intercalated Mg2+ ions with Na+ in solution, but the OER efficiency still remained at 57%, much higher than that (28%) without the upper Mg|Co-MnO2. This demonstrates that the interlayer spaces between MnO2 layers acted as pathways for H2O molecules to reach the active sites of the underlying Co(OH)2. Density functional theory (DFT) calculations revealed that the most stable structure of hydrated Mg2+ ion, in which a part of coordinated H2O molecules is hydrolyzed, has less affinity toward Cl- ion than that of hydrated Na+ ion.
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Affiliation(s)
- Takuya Okada
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | - Hikaru Abe
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
- Nakabohtec Corrosion Protecting Co., Ltd, Ageo 362-0052, Japan
| | - Ai Murakami
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | - Tomohito Shimizu
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | - Kenta Fujii
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | | | - Masaharu Nakayama
- Department of Applied Chemistry, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
- Blue Energy Center for SGE Technology (BEST), Ube 755-8611, Japan
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de Palo A, La Ganga G, Nastasi F, Guelfi M, Bortoluzzi M, Pampaloni G, Puntoriero F, Campagna S, Marchetti F. Ru(ii) water oxidation catalysts with 2,3-bis(2-pyridyl)pyrazine and tris(pyrazolyl)methane ligands: assembly of photo-active and catalytically active subunits in a dinuclear structure. Dalton Trans 2020; 49:3341-3352. [PMID: 32103210 DOI: 10.1039/c9dt04815d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two mononuclear Ru(ii) complexes, i.e. [RuCl(κ3N-terpy)(κ2N-dpp)]PF6 ([1]PF6; terpy = 2,2':6',2''-terpyridine; dpp = 2,3-bis(2'-pyridyl-pyrazine) and [RuCl(κ3N-tpm)(κ2N-dpp)]Cl ([2]Cl; tpm = tris(1-pyrazolyl)methane), and one dinuclear complex, i.e. [Ru2Cl(κ3N-tpm)(μ-κ2N:κ2N-dpp)Ru(κ2N-bpy)2][PF6]3 ([3][PF6]3; bpy = 2,2'-bipyridine), have been synthesized and their water oxidation catalytic properties have been investigated. A combined DFT and experimental (35Cl NMR and conductivity measurements) study aimed to elucidate the nature of [1]+ and [2]+ in aqueous solution has also been performed, indicating that one water molecule is allowed to enter the first coordination sphere of [2]+ in the ground state, replacing one tpm nitrogen. Conversely, in the case of [1]+, water coordination, assumed to be needed for the water oxidation process, presumably occurs following the oxidation of the metal. For all complexes, a catalytic wave has been detected in acetonitrile/water 1 : 1 (v/v) solution in the range 1.4-1.7 V vs. SCE. In all cases, water oxidation (investigated at pH < 8) takes place initially via a proton-coupled two-electron, two-proton process with the formation of an Ru(iv)[double bond, length as m-dash]O moiety, followed by one electron oxidation and water nucleophilic attack. The TON and TOF values (within the range of 16-33 and 1.3-2.2 h-1, respectively) of the complexes are higher than those of the benchmark [Ru(LLL)(LL)(OH2)]2+-type species (LLL and LL are tridentate and bidentate polypyridine ligands, respectively), which is [Ru(terpy)(bpm)(OH2)]2+.
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Affiliation(s)
- Alice de Palo
- Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
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