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Han L, Yu H, Xiang Z. Asymmetric Active Sites for Boosting Oxygen Evolution Reaction. Small 2023; 19:e2304108. [PMID: 37317013 DOI: 10.1002/smll.202304108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/06/2023] [Indexed: 06/16/2023]
Abstract
Transition metal-nitrogen-carbon materials with atomically dispersed active sites are promising catalysts for oxygen evolution reaction (OER) since they combine the strengths of both homogeneous and heterogeneous catalysts. However, the canonically symmetric active site usually exhibits poor OER intrinsic activity due to its excessively strong or weak oxygen species adsorption. Here, a catalyst with asymmetric MN4 sites based on the 3-s-triazine of g-C3 N4 (termed as a-MN4 @NC) is proposed. Compared to symmetric, the asymmetric active sites directly modulate the oxygen species adsorption via unifying planar and axial orbitals (dx2 -y2 , dz2 ), thus enabling higher OER intrinsic activity. In Silico screening suggested that cobalt has the best OER activity among familiar nonprecious transition metal. These experimental results suggest that the intrinsic activity of asymmetric active sites (179 mV overpotential at onset potential) is enhanced by 48.4% compared to symmetric under similar conditions. Remarkably, a-CoN4 @NC showed excellent activity in alkaline water electrolyzer (AWE) device as OER catalyst, the electrolyzer only required 1.7 V and 2.1 V respectively to reach the current density of 150 mA cm-2 and 500 mA cm-2 . This work opens an avenue for modulating the active sites to obtain high intrinsic electrocatalytic performance including, but not limited to, OER.
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Affiliation(s)
- Linkai Han
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Haifeng Yu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China
| | - Zhonghua Xiang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China
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Li H, Sun M, Gu H, Huang J, Wang G, Tan R, Wu R, Zhang X, Liu S, Zheng L, Chen W, Chen Z. Peroxidase-Like FeCoZn Triple-Atom Catalyst-Based Electronic Tongue for Colorimetric Discrimination of Food Preservatives. Small 2023; 19:e2207036. [PMID: 36599617 DOI: 10.1002/smll.202207036] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 12/09/2022] [Indexed: 06/17/2023]
Abstract
Recently, single-atom catalysts are attracting much attention in sensor field due to their remarkable peroxidase- or oxidase-like activities. Herein, peroxidase-like FeCoZn triple-atom catalyst supported on S- and N-doped carbon derived from ZIF-8 (FeCoZn-TAC/SNC) serves as a proof-of-concept nanozyme. In this paper, a dual-channel nanozyme-based colorimetric sensor array is presented for identifying seven preservatives in food. Further experiments reveal that the peroxidase-like activity of the FeCoZn TAzyme enables it to catalyze the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) and o-phenylenediamine (OPD) in the presence of H2 O2 , yielding the blue oxTMB and yellow oxOPD, respectively. However, food preservatives are adsorbed on the nanozyme surface through π-π stacking interaction and hydrogen bond, and the reduction in catalytic activity of FeCoZn TAzyme causes differential colorimetric signal variations, which provide unique "fingerprints" for each food preservative.
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Affiliation(s)
- Heng Li
- Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Mengru Sun
- Energy & Catalysis Center, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Hongfei Gu
- Energy & Catalysis Center, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Juan Huang
- Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Guo Wang
- Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Renjian Tan
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H0AJ, UK
| | - Rufen Wu
- Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Xinyu Zhang
- Department of Chemistry, Capital Normal University, Beijing, 100048, China
| | - Shuhu Liu
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Lirong Zheng
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Wenxing Chen
- Energy & Catalysis Center, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China
| | - Zhengbo Chen
- Department of Chemistry, Capital Normal University, Beijing, 100048, China
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