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Xue D, Yuan Y, Yu Y, Xu S, Wei Y, Zhang J, Guo H, Shao M, Zhang JN. Spin occupancy regulation of the Pt d-orbital for a robust low-Pt catalyst towards oxygen reduction. Nat Commun 2024; 15:5990. [PMID: 39013873 PMCID: PMC11252259 DOI: 10.1038/s41467-024-50332-x] [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: 12/16/2023] [Accepted: 07/05/2024] [Indexed: 07/18/2024] Open
Abstract
Disentangling the limitations of O-O bond activation and OH* site-blocking effects on Pt sites is key to improving the intrinsic activity and stability of low-Pt catalysts for the oxygen reduction reaction (ORR). Herein, we integrate of PtFe alloy nanocrystals on a single-atom Fe-N-C substrate (PtFe@FeSAs-N-C) and further construct a ferromagnetic platform to investigate the regulation behavior of the spin occupancy state of the Pt d-orbital in the ORR. PtFe@FeSAs-N-C delivers a mass activity of 0.75 A mgPt-1 at 0.9 V and a peak power density of 1240 mW cm-2 in the fuel-cell, outperforming the commercial Pt/C catalyst, and a mass activity retention of 97%, with no noticeable current drop at 0.6 V for more than 220 h, is attained. Operando spectroelectrochemistry decodes the orbital interaction mechanism between the active center and reaction intermediates. The Pt dz2 orbital occupation state is regulated to t2g6eg3 by spin-charge injection, suppressing the OH* site-blocking effect and effectively inhibiting H2O2 production. This work provides valuable insights into designing high-performance and low-Pt catalysts via spintronics-level engineering.
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Affiliation(s)
- Dongping Xue
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yifang Yuan
- Key Laboratory of Materials Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China
| | - Yue Yu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Siran Xu
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yifan Wei
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Jiaqi Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Haizhong Guo
- Key Laboratory of Materials Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China
| | - Minhua Shao
- Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong
| | - Jia-Nan Zhang
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
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Zhang S, Chang X, Zhou L, Liu X, Zhang J. Stabilizing Single-Atom Pt on Fe 2O 3 Nanosheets by Constructing Oxygen Vacancies for Ultrafast H 2 Sensing. ACS Sens 2024; 9:2101-2109. [PMID: 38574240 DOI: 10.1021/acssensors.4c00162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Single-atom catalysts (SACs) hold great promise in highly sensitive and selective gas sensors due to their ultrahigh atomic efficiency and excellent catalytic activity. However, due to the extremely high surface energy of SACs, it is still a huge challenge to synthesize a stable single-atom metal on sensitive materials. Here, we report an atomic layer deposition (ALD) strategy for the elaborate synthesis of single-atom Pt on oxygen vacancy-rich Fe2O3 nanosheets (Pt-Fe2O3-Vo), which displayed ultrafast and sensitive detection to H2, achieving the stability of Pt single atoms. Gas-sensing investigation showed that the Pt-Fe2O3-Vo materials enabled a significantly enhanced response of 26.5-50 ppm of H2, which was 17-fold higher than that of pure Fe2O3, as well as ultrafast response time (2 s), extremely low detection limit (86 ppb), and improved stability. The experimental and density functional theory (DFT) studies revealed that the abundant oxygen vacancy sites of Fe2O3 contributed to stabilizing the Pt atoms via electron transfer. In addition, the stabilized Pt atoms also greatly promote the electron transfer of H2 molecules to Fe2O3, thereby achieving an excellent H2 sensing performance. This work provides a potential strategy for the development of highly selective and stable chemical sensors.
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Affiliation(s)
- Songchen Zhang
- College of Physics, Qingdao University, Qingdao 266071, China
| | - Xiao Chang
- College of Physics, Qingdao University, Qingdao 266071, China
| | - Lihao Zhou
- College of Physics, Qingdao University, Qingdao 266071, China
| | - Xianghong Liu
- College of Physics, Qingdao University, Qingdao 266071, China
| | - Jun Zhang
- College of Physics, Qingdao University, Qingdao 266071, China
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Zhang E, Dong A, Yin K, Ye C, Zhou Y, Tan C, Li M, Zheng X, Wang Y, Gao X, Li H, Wang D, Guo S. Electron Localization in Rationally Designed Pt 1Pd Single-Atom Alloy Catalyst Enables High-Performance Li-O 2 Batteries. J Am Chem Soc 2024; 146:2339-2344. [PMID: 38237055 DOI: 10.1021/jacs.3c12734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
Li-O2 batteries (LOBs) are considered as one of the most promising energy storage devices due to their ultrahigh theoretical energy density, yet they face the critical issues of sluggish cathode redox kinetics during the discharge and charge processes. Here we report a direct synthetic strategy to fabricate a single-atom alloy catalyst in which single-atom Pt is precisely dispersed in ultrathin Pd hexagonal nanoplates (Pt1Pd). The LOB with the Pt1Pd cathode demonstrates an ultralow overpotential of 0.69 V at 0.5 A g-1 and negligible activity loss over 600 h. Density functional theory calculations show that Pt1Pd can promote the activation of the O2/Li2O2 redox couple due to the electron localization caused by the single Pt atom, thereby lowering the energy barriers for the oxygen reduction and oxygen evolution reactions. Our strategy for designing single-atom alloy cathodic catalysts can address the sluggish oxygen redox kinetics in LOBs and other energy storage/conversion devices.
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Affiliation(s)
- Erhuan Zhang
- Future Battery Research Center, Global Institute of Future Technology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Anqi Dong
- School of Materials Science & Engineering, Anhui University, Hefei 230601, China
| | - Kun Yin
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
- Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Chenliang Ye
- Department of Power Engineering, North China Electric Power University, Baoding 071003, Hebei, China
| | - Yin Zhou
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Chuan Tan
- Future Battery Research Center, Global Institute of Future Technology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Menggang Li
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
| | - Xiaobo Zheng
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yu Wang
- Shanghai Synchrotron Radiation Facilities, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
| | - Xiangwen Gao
- Future Battery Research Center, Global Institute of Future Technology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hongbo Li
- Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Dingsheng Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Shaojun Guo
- School of Materials Science and Engineering, Peking University, Beijing 100871, China
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Wang Y, Wang Y, Lee LYS, Wong KY. An emerging direction for nanozyme design: from single-atom to dual-atomic-site catalysts. NANOSCALE 2023; 15:18173-18183. [PMID: 37921779 DOI: 10.1039/d3nr04853e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2023]
Abstract
Nanozymes, a new class of functional nanomaterials with enzyme-like characteristics, have recently made great achievements and have become potential substitutes for natural enzymes. In particular, single-atomic nanozymes (Sazymes) have received intense research focus on account of their versatile enzyme-like performances and well-defined spatial configurations of single-atomic sites. More recently, dual-atomic-site catalysts (DACs) containing two neighboring single-atomic sites have been explored as next-generation nanozymes, thanks to the flexibility in tuning active sites by various combinations of two single-atomic sites. This minireview outlines the research progress of DACs in their synthetic approaches and the latest characterization techniques highlighting a series of representative examples of DAC-based nanozymes. In the final remarks, we provide current challenges and perspectives for developing DAC-based nanozymes as a guide for researchers who would be interested in this exciting field.
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Affiliation(s)
- Ying Wang
- Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.
| | - Yong Wang
- Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.
| | - Lawrence Yoon Suk Lee
- Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.
- Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China
| | - Kwok-Yin Wong
- Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chemical Biology and Drug Discovery, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.
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