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Li J, Yang X, Ma D, Liu J, Ma C, Liu N, Lu L, Wang T, Pang X, Yang Y, Zhang Q, Li X. Multi-layered carbon accommodation of MnO 2 enabling fast kinetics for highly stable zinc ion batteries. J Colloid Interface Sci 2024; 676:927-936. [PMID: 39068837 DOI: 10.1016/j.jcis.2024.07.186] [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: 04/30/2024] [Revised: 07/12/2024] [Accepted: 07/21/2024] [Indexed: 07/30/2024]
Abstract
Large-scale durable aqueous zinc ion batteries for stationary storage are realized by spray-coating conductive PEDOT(Poly(3,4-ethylenedioxythiophene)) wrapping MnO2/carbon microspheres hybrid cathode in this work. The porous carbon microspheres with multiple layers deriving from sucrose provide suitable accommodation for MnO2 active materials, exposing more redox active sites and enhancing the contact surface between electrolyte and active materials. As a result, MnO2/microspheres are adhered to the current collector by a conductive PEDOT coating without any binder. The ternary design retards the structural degradation during cycling and shortens the electron and ion transport path, rendering the full batteries high capacity and long cycle stability. The resulting batteries perform the capacity of 277, 227, 110, 85 and 50 mAh/g at 0.2, 0.5, 1, 2 and 5 A/g, respectively. After 3000 cycles the initial capacity retains 86%, and 80% after 5000 cycles. GITT indicates PEDOT wrapping MnO2/microspheres cathode enables better ion intercalating kinetics than conventional MnO2. The work could represent a novel and significant step forward in the studies on the large-scale application of zinc ion batteries.
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Affiliation(s)
- Junpeng Li
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | - Xubo Yang
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | - Dongxin Ma
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | | | - Chunjie Ma
- Xi'an XD Power Capacitor Co., Ltd., Xi'an, Shaanxi 710018, China
| | - Nailiang Liu
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | - Leilei Lu
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | - Tingxia Wang
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | - Xiufen Pang
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | - Yihui Yang
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China
| | - Qian Zhang
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China.
| | - Xifei Li
- Xi'an University of Technology, Xi'an, Shaanxi 710048, China.
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Wang T, Zhang X, Yu X, Liu Y, Li J, Liu Z, Zhao N, Zhang J, Niu J, Feng Q. Modulating the electronic structure of VS 2via Ru decoration for an efficient pH-universal electrocatalytic hydrogen evolution reaction. NANOSCALE 2024; 16:11250-11261. [PMID: 38780439 DOI: 10.1039/d4nr01414f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
High-efficiency water electrolysis over a broad pH range is desirable but challenging. Herein, Ru-decorated VS2 on carbon cloth (Ru-VS2/CC) has been in situ synthesized, which features the regulated electronic structure of VS2 by introducing Ru. It is remarkable that the optimal Ru-VS2/CC displays excellent electrocatalytic hydrogen evolution activity with overpotentials of 89 and 87 mV at -10 mA cm-2 in 0.5 M H2SO4 and 1.0 M KOH, respectively. Theoretical calculations and electrocatalytic measurements have demonstrated that introducing Ru induces an enhanced charge density around the Fermi level, facilitating charge transfer and speeding up the electrocatalytic HER kinetics. The Gibbs free energy of the hydrogen intermediate (ΔGH*) of Ru-VS2/CC (0.23 eV) is much closer to zero than that of pure VS2 (0.51 eV) and Ru (-0.37 eV), demonstrating an easier hydrogen adsorption and desorption process for Ru-VS2/CC. The more favorable ΔGH*, differential charge density and the d-band center endow Ru-VS2 with enhanced intrinsic electrocatalytic activity. This study presents a feasible strategy for enhancing electrocatalytic HER activity by the regulation of the electronic structure and the rational integration of dual active components.
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Affiliation(s)
- Tingxia Wang
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Xu Zhang
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Xiaojiao Yu
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Yun Liu
- Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China.
| | - Junpeng Li
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Zongbin Liu
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Ningning Zhao
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Jian Zhang
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Jinfen Niu
- School of Science, Xi'an University of Technology, Xi'an, Shaanxi, 710054, China.
| | - Qingliang Feng
- Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China.
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Wang T, Zhang X, Yu X, Li J, Wang K, Niu J. Interfacial Interaction in NiFe LDH/NiS 2/VS 2 for Enhanced Electrocatalytic Water Splitting. Molecules 2024; 29:951. [PMID: 38474464 DOI: 10.3390/molecules29050951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/16/2024] [Accepted: 02/17/2024] [Indexed: 03/14/2024] Open
Abstract
A bifunctional electrocatalyst with high efficiency and low costs for overall water splitting is critical to achieving a green hydrogen economy and coping with the energy crisis. However, developing robust electrocatalysts still faces huge challenges, owing to unsatisfactory electron transfer and inherent activity. Herein, NiFe LDH/NiS2/VS2 heterojunctions have been designed as freestanding bifunctional electrocatalysts to split water, exhibiting enhanced electron transfer and abundant catalytic sites. The optimum NiFe LDH/NiS2/VS2 electrocatalyst exhibits a small overpotential of 380 mV at 10 mA cm-2 for overall water splitting and superior electrocatalytic performance in both hydrogen and oxygen evolution reactions (HER/OER). Specifically, the electrocatalyst requires overpotentials of 76 and 286 mV at 10 mA cm-2 for HER and OER, respectively, in alkaline electrolytes, which originate from the synergistic interaction among the facilitated electron transfer and increasingly exposed active sites due to the modulation of interfaces and construction of heterojunctions.
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Affiliation(s)
- Tingxia Wang
- School of Science, Xi'an University of Technology, Xi'an 710054, China
| | - Xu Zhang
- School of Science, Xi'an University of Technology, Xi'an 710054, China
| | - Xiaojiao Yu
- School of Science, Xi'an University of Technology, Xi'an 710054, China
| | - Junpeng Li
- School of Science, Xi'an University of Technology, Xi'an 710054, China
| | - Kai Wang
- School of Science, Xi'an University of Technology, Xi'an 710054, China
| | - Jinfen Niu
- School of Science, Xi'an University of Technology, Xi'an 710054, China
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