26
|
Kosmala T, Bibent N, Sougrati MT, Dražić G, Agnoli S, Jaouen F, Granozzi G. Stable, Active, and Methanol-Tolerant PGM-Free Surfaces in an Acidic Medium: Electron Tunneling at Play in Pt/FeNC Hybrid Catalysts for Direct Methanol Fuel Cell Cathodes. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01288] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
27
|
Sgarbi R, Ticianelli EA, Maillard F, Jaouen F, Chatenet M. Oxygen Reduction Reaction on Metal and Nitrogen–Doped Carbon Electrocatalysts in the Presence of Sodium Borohydride. Electrocatalysis (N Y) 2020. [DOI: 10.1007/s12678-020-00602-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
28
|
Sibul R, Kibena‐Põldsepp E, Ratso S, Kook M, Sougrati MT, Käärik M, Merisalu M, Aruväli J, Paiste P, Treshchalov A, Leis J, Kisand V, Sammelselg V, Holdcroft S, Jaouen F, Tammeveski K. Iron‐ and Nitrogen‐Doped Graphene‐Based Catalysts for Fuel Cell Applications. ChemElectroChem 2020. [DOI: 10.1002/celc.202000011] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
29
|
Kumar K, Dubau L, Mermoux M, Li J, Zitolo A, Nelayah J, Jaouen F, Maillard F. On the Influence of Oxygen on the Degradation of Fe‐N‐C Catalysts. Angew Chem Int Ed Engl 2020; 59:3235-3243. [DOI: 10.1002/anie.201912451] [Citation(s) in RCA: 93] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Indexed: 12/18/2022]
|
30
|
Kumar K, Dubau L, Mermoux M, Li J, Zitolo A, Nelayah J, Jaouen F, Maillard F. On the Influence of Oxygen on the Degradation of Fe‐N‐C Catalysts. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912451] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
31
|
Li J, Jiao L, Wegener E, Richard LL, Liu E, Zitolo A, Sougrati MT, Mukerjee S, Zhao Z, Huang Y, Yang F, Zhong S, Xu H, Kropf AJ, Jaouen F, Myers DJ, Jia Q. Evolution Pathway from Iron Compounds to Fe1(II)–N4 Sites through Gas-Phase Iron during Pyrolysis. J Am Chem Soc 2019; 142:1417-1423. [DOI: 10.1021/jacs.9b11197] [Citation(s) in RCA: 124] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
32
|
Li J, Pršlja P, Shinagawa T, Martín Fernández AJ, Krumeich F, Artyushkova K, Atanassov P, Zitolo A, Zhou Y, García-Muelas R, López N, Pérez-Ramírez J, Jaouen F. Volcano Trend in Electrocatalytic CO2 Reduction Activity over Atomically Dispersed Metal Sites on Nitrogen-Doped Carbon. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02594] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
33
|
Karapinar D, Huan NT, Ranjbar Sahraie N, Li J, Wakerley D, Touati N, Zanna S, Taverna D, Galvão Tizei LH, Zitolo A, Jaouen F, Mougel V, Fontecave M. Electroreduction of CO
2
on Single‐Site Copper‐Nitrogen‐Doped Carbon Material: Selective Formation of Ethanol and Reversible Restructuration of the Metal Sites. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907994] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
34
|
Karapinar D, Huan NT, Ranjbar Sahraie N, Li J, Wakerley D, Touati N, Zanna S, Taverna D, Galvão Tizei LH, Zitolo A, Jaouen F, Mougel V, Fontecave M. Electroreduction of CO
2
on Single‐Site Copper‐Nitrogen‐Doped Carbon Material: Selective Formation of Ethanol and Reversible Restructuration of the Metal Sites. Angew Chem Int Ed Engl 2019; 58:15098-15103. [DOI: 10.1002/anie.201907994] [Citation(s) in RCA: 215] [Impact Index Per Article: 43.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 08/02/2019] [Indexed: 12/18/2022]
|
35
|
Mineva T, Matanovic I, Atanassov P, Sougrati MT, Stievano L, Clémancey M, Kochem A, Latour JM, Jaouen F. Understanding Active Sites in Pyrolyzed Fe–N–C Catalysts for Fuel Cell Cathodes by Bridging Density Functional Theory Calculations and 57Fe Mössbauer Spectroscopy. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02586] [Citation(s) in RCA: 118] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
36
|
Sun Y, Silvioli L, Sahraie NR, Ju W, Li J, Zitolo A, Li S, Bagger A, Arnarson L, Wang X, Moeller T, Bernsmeier D, Rossmeisl J, Jaouen F, Strasser P. Activity-Selectivity Trends in the Electrochemical Production of Hydrogen Peroxide over Single-Site Metal-Nitrogen-Carbon Catalysts. J Am Chem Soc 2019; 141:12372-12381. [PMID: 31306016 DOI: 10.1021/jacs.9b05576] [Citation(s) in RCA: 230] [Impact Index Per Article: 46.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Nitrogen-doped carbon materials featuring atomically dispersed metal cations (M-N-C) are an emerging family of materials with potential applications for electrocatalysis. The electrocatalytic activity of M-N-C materials toward four-electron oxygen reduction reaction (ORR) to H2O is a mainstream line of research for replacing platinum-group-metal-based catalysts at the cathode of fuel cells. However, fundamental and practical aspects of their electrocatalytic activity toward two-electron ORR to H2O2, a future green "dream" process for chemical industry, remain poorly understood. Here we combined computational and experimental efforts to uncover the trends in electrochemical H2O2 production over a series of M-N-C materials (M = Mn, Fe, Co, Ni, and Cu) exclusively comprising atomically dispersed M-Nx sites from molecular first-principles to bench-scale electrolyzers operating at industrial current density. We investigated the effect of the nature of a 3d metal within a series of M-N-C catalysts on the electrocatalytic activity/selectivity for ORR (H2O2 and H2O products) and H2O2 reduction reaction (H2O2RR). Co-N-C catalyst was uncovered with outstanding H2O2 productivity considering its high ORR activity, highest H2O2 selectivity, and lowest H2O2RR activity. The activity-selectivity trend over M-N-C materials was further analyzed by density functional theory, providing molecular-scale understandings of experimental volcano trends for four- and two-electron ORR. The predicted binding energy of HO* intermediate over Co-N-C catalyst is located near the top of the volcano accounting for favorable two-electron ORR. The industrial H2O2 productivity over Co-N-C catalyst was demonstrated in a microflow cell, exhibiting an unprecedented production rate of more than 4 mol peroxide gcatalyst-1 h-1 at a current density of 50 mA cm-2.
Collapse
|
37
|
Luo F, Choi CH, Primbs MJ, Ju W, Li S, Leonard ND, Thomas A, Jaouen F, Strasser P. Accurate Evaluation of Active-Site Density (SD) and Turnover Frequency (TOF) of PGM-Free Metal–Nitrogen-Doped Carbon (MNC) Electrocatalysts using CO Cryo Adsorption. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00588] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
38
|
Kumar K, Gairola P, Lions M, Ranjbar-Sahraie N, Mermoux M, Dubau L, Zitolo A, Jaouen F, Maillard F. Physical and Chemical Considerations for Improving Catalytic Activity and Stability of Non-Precious-Metal Oxygen Reduction Reaction Catalysts. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02934] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
39
|
Davydova ES, Mukerjee S, Jaouen F, Dekel DR. Electrocatalysts for Hydrogen Oxidation Reaction in Alkaline Electrolytes. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00689] [Citation(s) in RCA: 211] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
|
40
|
Jaouen F, Jones D, Coutard N, Artero V, Strasser P, Kucernak A. Toward Platinum Group Metal-Free Catalysts for Hydrogen/Air Proton-Exchange Membrane Fuel Cells. JOHNSON MATTHEY TECHNOLOGY REVIEW 2018. [DOI: 10.1595/205651318x696828] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
41
|
Chung MW, Chon G, Kim H, Jaouen F, Choi CH. Electrochemical Evidence for Two Sub-families of FeN
x
C
y
Moieties with Concentration-Dependent Cyanide Poisoning. ChemElectroChem 2018. [DOI: 10.1002/celc.201800067] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
42
|
Zitolo A, Ranjbar-Sahraie N, Mineva T, Li J, Jia Q, Stamatin S, Harrington GF, Lyth SM, Krtil P, Mukerjee S, Fonda E, Jaouen F. Identification of catalytic sites in cobalt-nitrogen-carbon materials for the oxygen reduction reaction. Nat Commun 2017; 8:957. [PMID: 29038426 PMCID: PMC5715157 DOI: 10.1038/s41467-017-01100-7] [Citation(s) in RCA: 236] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Accepted: 08/17/2017] [Indexed: 11/09/2022] Open
Abstract
Single-atom catalysts with full utilization of metal centers can bridge the gap between molecular and solid-state catalysis. Metal-nitrogen-carbon materials prepared via pyrolysis are promising single-atom catalysts but often also comprise metallic particles. Here, we pyrolytically synthesize a Co-N-C material only comprising atomically dispersed cobalt ions and identify with X-ray absorption spectroscopy, magnetic susceptibility measurements and density functional theory the structure and electronic state of three porphyrinic moieties, CoN4C12, CoN3C10,porp and CoN2C5. The O2 electro-reduction and operando X-ray absorption response are measured in acidic medium on Co-N-C and compared to those of a Fe-N-C catalyst prepared similarly. We show that cobalt moieties are unmodified from 0.0 to 1.0 V versus a reversible hydrogen electrode, while Fe-based moieties experience structural and electronic-state changes. On the basis of density functional theory analysis and established relationships between redox potential and O2-adsorption strength, we conclude that cobalt-based moieties bind O2 too weakly for efficient O2 reduction.Nitrogen-doped carbon materials with atomically dispersed iron or cobalt are promising for catalytic use. Here, the authors show that cobalt moieties have a higher redox potential, bind oxygen more weakly and are less active toward oxygen reduction than their iron counterpart, despite similar coordination.
Collapse
|
43
|
Choi CH, Choi WS, Kasian O, Mechler AK, Sougrati MT, Brüller S, Strickland K, Jia Q, Mukerjee S, Mayrhofer KJJ, Jaouen F. Unraveling the Nature of Sites Active toward Hydrogen Peroxide Reduction in Fe-N-C Catalysts. Angew Chem Int Ed Engl 2017; 56:8809-8812. [PMID: 28570025 PMCID: PMC5519930 DOI: 10.1002/anie.201704356] [Citation(s) in RCA: 149] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Indexed: 11/17/2022]
Abstract
Fe-N-C catalysts with high O2 reduction performance are crucial for displacing Pt in low-temperature fuel cells. However, insufficient understanding of which reaction steps are catalyzed by what sites limits their progress. The nature of sites were investigated that are active toward H2 O2 reduction, a key intermediate during indirect O2 reduction and a source of deactivation in fuel cells. Catalysts comprising different relative contents of FeNx Cy moieties and Fe particles encapsulated in N-doped carbon layers (0-100 %) show that both types of sites are active, although moderately, toward H2 O2 reduction. In contrast, N-doped carbons free of Fe and Fe particles exposed to the electrolyte are inactive. When catalyzing the ORR, FeNx Cy moieties are more selective than Fe particles encapsulated in N-doped carbon. These novel insights offer rational approaches for more selective and therefore more durable Fe-N-C catalysts.
Collapse
|
44
|
Choi CH, Choi WS, Kasian O, Mechler AK, Sougrati MT, Brüller S, Strickland K, Jia Q, Mukerjee S, Mayrhofer KJJ, Jaouen F. Unraveling the Nature of Sites Active toward Hydrogen Peroxide Reduction in Fe‐N‐C Catalysts. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704356] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
45
|
Huan TN, Ranjbar N, Rousse G, Sougrati M, Zitolo A, Mougel V, Jaouen F, Fontecave M. Electrochemical Reduction of CO2 Catalyzed by Fe-N-C Materials: A Structure–Selectivity Study. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03353] [Citation(s) in RCA: 290] [Impact Index Per Article: 41.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
46
|
Armel V, Hindocha S, Salles F, Bennett S, Jones D, Jaouen F. Structural Descriptors of Zeolitic–Imidazolate Frameworks Are Keys to the Activity of Fe–N–C Catalysts. J Am Chem Soc 2016; 139:453-464. [DOI: 10.1021/jacs.6b11248] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
47
|
Choi CH, Baldizzone C, Polymeros G, Pizzutilo E, Kasian O, Schuppert AK, Ranjbar Sahraie N, Sougrati MT, Mayrhofer KJJ, Jaouen F. Minimizing Operando Demetallation of Fe-N-C Electrocatalysts in Acidic Medium. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00643] [Citation(s) in RCA: 150] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
48
|
Sougrati MT, Goellner V, Schuppert AK, Stievano L, Jaouen F. Probing active sites in iron-based catalysts for oxygen electro-reduction: A temperature-dependent 57 Fe Mössbauer spectroscopy study. Catal Today 2016. [DOI: 10.1016/j.cattod.2015.10.017] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
49
|
Zitolo A, Goellner V, Armel V, Sougrati MT, Mineva T, Stievano L, Fonda E, Jaouen F. Identification of catalytic sites for oxygen reduction in iron- and nitrogen-doped graphene materials. NATURE MATERIALS 2015; 14:937-42. [PMID: 26259106 DOI: 10.1038/nmat4367] [Citation(s) in RCA: 874] [Impact Index Per Article: 97.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 06/05/2015] [Indexed: 05/22/2023]
Abstract
While platinum has hitherto been the element of choice for catalysing oxygen electroreduction in acidic polymer fuel cells, tremendous progress has been reported for pyrolysed Fe-N-C materials. However, the structure of their active sites has remained elusive, delaying further advance. Here, we synthesized Fe-N-C materials quasi-free of crystallographic iron structures after argon or ammonia pyrolysis. These materials exhibit nearly identical Mössbauer spectra and identical X-ray absorption near-edge spectroscopy (XANES) spectra, revealing the same Fe-centred moieties. However, the much higher activity and basicity of NH3-pyrolysed Fe-N-C materials demonstrates that the turnover frequency of Fe-centred moieties depends on the physico-chemical properties of the support. Following a thorough XANES analysis, the detailed structures of two FeN4 porphyrinic architectures with different O2 adsorption modes were then identified. These porphyrinic moieties are not easily integrated in graphene sheets, in contrast with Fe-centred moieties assumed hitherto for pyrolysed Fe-N-C materials. These new insights open the path to bottom-up synthesis approaches and studies on site-support interactions.
Collapse
|
50
|
Choi CH, Baldizzone C, Grote JP, Schuppert AK, Jaouen F, Mayrhofer KJJ. Stability of Fe-N-C Catalysts in Acidic Medium Studied by Operando Spectroscopy. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504903] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|