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Zhou Y, Gao G, Chu W, Wang LW. Computational screening of transition metal-doped phthalocyanine monolayers for oxygen evolution and reduction. NANOSCALE ADVANCES 2020; 2:710-716. [PMID: 36133246 PMCID: PMC9419810 DOI: 10.1039/c9na00648f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 11/29/2019] [Indexed: 05/13/2023]
Abstract
Rationally designing efficient, low-cost and stable catalysts toward the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) is of significant importance to the development of renewable energy technologies. In this work, we have systematically investigated a series of potentially efficient and stable single late transition metal atom doped phthalocyanines (TM@Pcs, TM = Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ir and Pt) as single-atom catalysts (SACs) for applications toward the OER and ORR through a computational screening approach. Our calculations indicate that TM atoms can tightly bind with Pc monolayers with high diffusion energy barriers to prevent the isolated atoms from clustering. The interaction strength between intermediates and TM@Pc governs the catalytic activities for the OER and ORR. Among all the considered TM@Pc catalysts, Ir@Pc and Rh@Pc were found to be efficient OER electrocatalysts with overpotentials η OER of 0.41 and 0.44 V, respectively, and for the ORR, Rh@Pc exhibits the lowest overpotential η ORR of 0.44 V followed by Ir@Pc (0.55 V), suggesting that Rh@Pc is an efficient bifunctional catalyst for both the OER and ORR. Moreover, it is worth noting that the Rh@Pc catalyst can remain stable against dissolution under the pH = 0 condition. Ab initio molecular dynamic calculations suggest that Rh@Pc could remain stable at 300 K. Our findings highlight a novel family of two-dimensional (2D) materials as efficient and stable SACs and offer a new strategy for catalyst design.
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Affiliation(s)
- Yanan Zhou
- School of Chemical Engineering, Sichuan University Chengdu 610065 Sichuan China
- Materials Science Division, Lawrence Berkeley National Laboratory Berkeley 94720 California USA
| | - Guoping Gao
- Materials Science Division, Lawrence Berkeley National Laboratory Berkeley 94720 California USA
| | - Wei Chu
- School of Chemical Engineering, Sichuan University Chengdu 610065 Sichuan China
| | - Lin-Wang Wang
- Materials Science Division, Lawrence Berkeley National Laboratory Berkeley 94720 California USA
- Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory Berkeley 94720 California USA
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Meng Z, Zhang Y, Shi Q, Liu Y, Du A, Lu R. A remarkable two-dimensional membrane for multifunctional gas separation: halogenated metal-free fused-ring polyphthalocyanine. Phys Chem Chem Phys 2018; 20:18931-18937. [PMID: 29896586 DOI: 10.1039/c8cp01648h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We theoretically explore the structural and mechanical properties of metal-free fused-ring polyphthalocyanine (H2PPc) and halogenated H2PPc (F-H2PPc and Cl-H2PPc) membranes, and the energy profiles for gaseous H2, CO, CH4, CO2 and N2 molecules adsorbing on and passing through these monolayers. Importantly, we reconsider in depth the values of the parameters in the definition of permeance, and corroborate the validity of the model from first-principles theory with the results of H2 diffusion from classic molecular dynamics simulations. With well-defined nanosized pores, halogenated H2PPc monolayers turn out to be multifunctional gas separation membranes, i.e. F-H2PPc for H2/CO, H2/CH4, CO2/N2, CO2/CH4, CO/CH4 and N2/CH4 separation as well as Cl-H2PPc for H2/CO, H2/CH4 and H2/CO2 separation, which should be of great potential in energy and environmental fields.
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Affiliation(s)
- Zhaoshun Meng
- Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.
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Wang Y, Li X, Zheng X, Yang J. Spin switch in iron phthalocyanine on Au(111) surface by hydrogen adsorption. J Chem Phys 2017; 147:134701. [PMID: 28987089 DOI: 10.1063/1.4996970] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The manipulation of spin states at the molecular scale is of fundamental importance for the development of molecular spintronic devices. One of the feasible approaches for the modification of a molecular spin state is through the adsorption of certain specific atoms or molecules including H, NO, CO, NH3, and O2. In this paper, we demonstrate that the local spin state of an individual iron phthalocyanine (FePc) molecule adsorbed on an Au(111) surface exhibits controllable switching by hydrogen adsorption, as evidenced by using first-principles calculations based on density functional theory. Our theoretical calculations indicate that different numbers of hydrogen adsorbed at the pyridinic N sites of the FePc molecule largely modify the structural and electronic properties of the FePc/Au(111) composite by forming extra N-H bonds. In particular, the adsorption of one or up to three hydrogen atoms induces a redistribution of charge (spin) density within the FePc molecule, and hence a switching to a low spin state (S = 1/2) from an intermediate spin state (S = 1) is achieved, while the adsorption of four hydrogen atoms distorts the molecular conformation by increasing Fe-N bond lengths in FePc and thus breaks the ligand field exerted on the Fe 3d orbitals via stronger hybridization with the substrate, leading to an opposite switching to a high-spin state (S = 2). These findings obtained from the theoretical simulations could be useful for experimental manipulation or design of single-molecule spintronic devices.
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Affiliation(s)
- Yu Wang
- Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China
| | - Xiaoguang Li
- Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China
| | - Xiao Zheng
- Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Jinlong Yang
- Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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Mpoutas D, Tsetseris L. Magnetic two-dimensional C3N2 carbonitrides: semiconductors, metals and half-metals. Phys Chem Chem Phys 2017; 19:26743-26748. [PMID: 28948242 DOI: 10.1039/c7cp04934j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using density-functional theory (DFT) calculations we probe the spin polarization of functionalized two-dimensional (2D) phthalo-carbonitrides (pc-C3N2), i.e., 2D polymers of tetra-cyanoethylene.
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Affiliation(s)
- Dimitrios Mpoutas
- Department of Physics
- National Technical University of Athens
- Athens
- Greece
| | - Leonidas Tsetseris
- Department of Physics
- National Technical University of Athens
- Athens
- Greece
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Wang Y, Yuan H, Li Y, Chen Z. Two-dimensional iron-phthalocyanine (Fe-Pc) monolayer as a promising single-atom-catalyst for oxygen reduction reaction: a computational study. NANOSCALE 2015; 7:11633-41. [PMID: 26098266 DOI: 10.1039/c5nr00302d] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Searching for low-cost non-Pt catalysts for oxygen reduction reaction (ORR) has been a key scientific issue in the development of fuel cells. In this work, the potential of utilizing the experimentally available two-dimensional (2D) Fe-phthalocyanine (Fe-Pc) monolayer with precisely-controlled distribution of Fe atoms as a catalyst of ORR was systematically explored by means of comprehensive density functional theory computations. The computations revealed that O2 molecules can be sufficiently activated on the surface of the Fe-Pc monolayer, and the subsequent ORR steps prefer to proceed on the Fe-Pc monolayer through a more efficient 4e pathway with a considerable limiting potential of 0.68 V. Especially, the Fe-Pc monolayer is more stable than the Fe-Pc molecule in acidic medium, and can present good catalytic performance for ORR on the addition of axial ligands. Therefore, the Fe-Pc monolayer is quite a promising single-atom-catalyst with high efficiency for ORR in fuel cells.
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Affiliation(s)
- Yu Wang
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University, Nanjing, Jiangsu 210023, China.
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Zhang S, Li Y, Zhao T, Wang Q. Robust ferromagnetism in monolayer chromium nitride. Sci Rep 2014; 4:5241. [PMID: 24912562 PMCID: PMC4050403 DOI: 10.1038/srep05241] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 05/22/2014] [Indexed: 11/24/2022] Open
Abstract
Design and synthesis of two-dimensional (2D) materials with robust ferromagnetism and biocompatibility is highly desirable due to their potential applications in spintronics and biodevices. However, the hotly pursued 2D sheets including pristine graphene, monolayer BN, and layered transition metal dichalcogenides are nonmagnetic or weakly magnetic. Using biomimetic particle swarm optimization (PSO) technique combined with ab initio calculations we predict the existence of a 2D structure, a monolayer of rocksalt-structured CrN (100) surface, which is both ferromagnetic and biocompatible. Its dynamic, thermal and magnetic stabilities are confirmed by carrying out a variety of state-of-the-art theoretical calculations. Analyses of its band structure and density of states reveal that this material is half-metallic, and the origin of the ferromagnetism is due to p-d exchange interaction between the Cr and N atoms. We demonstrate that the displayed ferromagnetism is robust against thermal and mechanical perturbations. The corresponding Curie temperature is about 675 K which is higher than that of most previously studied 2D monolayers.
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Affiliation(s)
- Shunhong Zhang
- Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, China
| | - Yawei Li
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Tianshan Zhao
- Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, China
| | - Qian Wang
- Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, China
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
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Li Y, Sun Q. The superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet. Sci Rep 2014; 4:4098. [PMID: 24526163 PMCID: PMC3924217 DOI: 10.1038/srep04098] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 01/28/2014] [Indexed: 11/24/2022] Open
Abstract
Two-dimensional organometallic sheets containing regularly and separately distributed transition atoms (TMs) have received tremendous attentions due to their flexibility in synthesis, well-defined geometry and the promising applications in hydrogen storage, electronic circuits, quantum Hall effect, and spintronics. Here for the first time we present a study on the superior catalytic CO oxidation capacity of a Cr-phthalocyanine porous sheet proceeding first via Langmuir-Hinshelwood (LH) mechanism and then via Eley-Rideal (ER) mechanism. Compared to the noble metal based catalysts or graphene supported catalysts, our studied system has following unique features: without poisoning effect and clustering problem, having comparable reaction energy barrier for low-temperature oxidation, and low cost for large-scale catalytic CO oxidation in industry.
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Affiliation(s)
- Yawei Li
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Qiang Sun
- 1] Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China [2] Center for Applied Physics and Technology, Peking University, Beijing 100871, China
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Zhu G, Li Y, Lü K, Sun Q. Phthalocyanine-based organometallic nanocages: properties and gas storage. Chemphyschem 2013; 15:126-31. [PMID: 24288296 DOI: 10.1002/cphc.201300830] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Indexed: 11/09/2022]
Abstract
Phthalocyanine (Pc) molecules are well-known flexible structural units for 1D nanotubes and 2D nanosheets. First-principles calculations combined with grand canonical Monte Carlo simulations are used to obtain the geometries, electronic structures, optical properties, and hydrogen-storage capacities of nanocages consisting of six Pc molecules with six Mg or Ca atoms. The primitive Pc cage has Th symmetry with twofold degeneracy in the highest occupied molecular orbital (HOMO), and threefold degeneracy in the lowest unoccupied molecular orbital (LUMO); the corresponding HOMO-LUMO gap is found to be 0.97 eV. The MgPc and CaPc cages have Oh symmetry with a HOMO-LUMO gap of 1.24 and 1.13 eV, respectively. Optical absorption spectra suggest that the Pc-based cages can absorb infrared light, which is different from the visible-light absorption in Pc molecules. We further show that the excess uptake of hydrogen on MgPc and CaPc cages at 298 K and 100 bar (1 bar=0.1 MPa) is about 3.49 and 4.74 wt%, respectively. The present study provides new insight into Pc-based nanostructures with potential applications.
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Affiliation(s)
- Guizhi Zhu
- Department of Materials Science and Engineering, Peking University, Beijing 100871 (PR China)
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