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Chen H, Li Y, Li X, Gao X, Chen J, Han B, Gao Q, Hu R, Zhou C, Xia K, Zhu M. Boric acid templating synthesis of highly-dense yet ultramicroporous carbons for compact capacitive energy storage. J Colloid Interface Sci 2024; 662:986-994. [PMID: 38387367 DOI: 10.1016/j.jcis.2024.02.041] [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: 12/02/2023] [Revised: 01/30/2024] [Accepted: 02/04/2024] [Indexed: 02/24/2024]
Abstract
Carbon-based supercapacitors have shown great promise for miniaturized electronics and electric vehicles, but are usually limited by their low volumetric performance, which is largely due to the inefficient utilization of carbon pores in charge storage. Herein, we develop a reliable and scalable boric acid templating technique to prepare boron and oxygen co-modified highly-dense yet ultramicroporous carbons (BUMCs). The carbons are featured with high density (up to 1.62 g cm-3), large specific surface area (up to 1050 m2 g-1), narrow pore distribution (0.4-0.6 nm) and exquisite pore surface functionalities (mainly -BC2O, -BCO2, and -COH groups). Consequently, the carbons show exceptionally compact capacitive energy storage. The optimal BUMC-0.5 delivers an outstanding volumetric capacitance of 431 F cm-3 and a high-rate capability in 1 M H2SO4. In particular, an ever-reported high volumetric energy density of 32.6 Wh L-1 can be harvested in an aqueous symmetric supercapacitor. Our results demonstrate that the -BC2O and -BCO2 groups on the ultramicropore walls can facilitate the internal SO42- ion transport, thus leading to an unprecedented high utilization efficiency of ultramicropores for charge storage. This work provides a new paradigm for construction and utilization of dense and ultramicroporous carbons for compact energy storage.
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Affiliation(s)
- Haoran Chen
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China
| | - Yudie Li
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China
| | - Xin Li
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China
| | - Xue Gao
- School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou 510640, China
| | - Jingyu Chen
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China
| | - Bo Han
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China
| | - Qiang Gao
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China
| | - Renzong Hu
- School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou 510640, China
| | - Chenggang Zhou
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China.
| | - Kaisheng Xia
- Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430078, China.
| | - Min Zhu
- School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou 510640, China.
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Sumathirathne L, Hasselbrink CL, Hayes D, Euler WB. Catalytic Thermal Decomposition of NO 2 by Iron(III) Nitrate Nonahydrate-Doped Poly(Vinylidene Difluoride). ACS OMEGA 2022; 7:43839-43846. [PMID: 36506204 PMCID: PMC9730309 DOI: 10.1021/acsomega.2c04970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 11/07/2022] [Indexed: 06/17/2023]
Abstract
The products of thermal decomposition of iron nitrate nonahydrate doped into poly(vinylidene difluoride) are examined using Mössbauer spectroscopy. Very little of the expected nitrogen dioxide product is observed, which is attributed to Fe3+ catalysis of the decomposition of NO2. The active site of the catalysis is shown to be Fe(OH)3 in the polymer matrix, which is, unexpectedly, reduced to Fe(OH)2. Thermodynamic calculations show that the reduction of Fe3+ is exergonic at sufficiently high temperatures. A reaction sequence, including a catalytic cycle for decomposition of NO2, is proposed that accounts for the observed reaction products. The role of the polymer matrix is proposed to inhibit transport of gas-phase products, which allows them to interact with Fe(OH)3 doped in the polymer.
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Pang S, Hu Z, Fan C, Zhang W, Cai Y, Han S, Liu J, Liu J. Insights into the sodium storage mechanism of Bi 2Te 3 nanosheets as superior anodes for sodium-ion batteries. NANOSCALE 2022; 14:1755-1766. [PMID: 35060588 DOI: 10.1039/d1nr07960c] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Although bismuth-based anode materials for sodium-ion batteries (SIBs) have attracted wide attention, their large volume variation hinders their actual applications, especially in Bi2Te3 systems. In this study, Bi2Te3 nanosheets (BT-Ns) are fabricated by a novel strategy via a solvent reductive reaction. The elements Bi and Te are spontaneously grown into ultrathin nanosheets because the hexagonal crystal of Bi2Te3 has a strong tendency to grow horizontally. The crystal structure of the BT-Ns is well developed and the thickness is about 1.42 nm, which can not only offer more active sites but also promote electrical conductivity and the diffusion of Na ions and electrons. It exhibits excellent rate and long-term cyclic performance, delivering 364.0 mA h g-1 at 5 A g-1 after 1200 cycles. The high rate and long-term cyclic performance of the Bi2Te3 anodes is attributed to the facile design of the 2D nanosheet structure, presenting an effective strategy to construct anodes for SIBs. The sodium storage mechanism of Bi2Te3 follows a three-step crystallographic phase change of Bi2Te3, discovered by an in situ X-ray diffraction analysis. The applicability of BT-N anodes in full cells via pairing with Na3V2(PO4)3 cathodes delivers excellent performance (energy density of 107.2 W h kg-1) and satisfactory practical applied prospects.
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Affiliation(s)
- Simeng Pang
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
| | - Zhuang Hu
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
| | - Changling Fan
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
- Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, Hunan, 410082, China
- Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University, Changsha, Hunan, 410082, China
| | - Weihua Zhang
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
| | - Yan Cai
- College of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410018, China
| | - Shaochang Han
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
| | - Jinshui Liu
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
- Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, Hunan, 410082, China
| | - Jilei Liu
- College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
- Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University, Changsha, Hunan, 410082, China
- Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, Hunan, 410082, China
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