1
|
Cao L, Fang S, Xu B, Zhang B, Wang C, Xiao Z, Zou G, Hou H, Ou X, Ji X. Enabling Reversible Reaction by Uniform Distribution of Heterogeneous Intermediates on Defect-Rich SnSSe/C Layered Heterostructure for Ultralong-Cycling Sodium Storage. Small 2022; 18:e2202134. [PMID: 35638480 DOI: 10.1002/smll.202202134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/11/2022] [Indexed: 06/15/2023]
Abstract
2D layered Sn-based materials have attracted enormous attention due to their remarkable performance in sodium-ion batteries. Nevertheless, this promising candidate involves a complex Na+ -storage process with multistep conversion-alloying reactions, which induces the uneven dispersion of heterogeneous intermediate accompanied by severe agglomeration of metallic Sn0 , inescapably resulting in poor reaction reversibility with sluggish rate capability and inferior cyclic lifespan. Herein, a delicately layered heterostructure SnSSe/C consisting of defect-rich SnSSe and graphene is designed and successfully achieved via a facile hydrothermal process. The equal anionic substitution of Se in SnSSe crystal can trigger numerous defects, which can not only facilitate Na+ diffusion but also accelerate the nucleation process by inducing quantum-dot-level uniform distribution of heterogeneous intermediates, Na2 Se/Na2 S and Sn0 . Concurrently, in situ formed uniform Na2 Se/Na2 S grain boundaries confined by this unique layered heterostructure may effectively suppress the agglomeration of metallic Sn0 nanograins and boost the reversibility of conversion-alloying reaction. As a result, the SnSSe/C displays significant improvement in Na-storage performance, in terms of remarkable rate capability and ultralong cycling lifespan. This work, focusing on controlling intermediate distribution, provides an effective strategy to boost reaction reversibility, which can be wildly employed in conversion-based electrodes for energy storage regions.
Collapse
Affiliation(s)
- Liang Cao
- Hunan Province Key Laboratory of Chemical Power Source, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
- School of Metallurgy and Environment, Central South University, No.932 South Lushan Road, Changsha, Hunan, 410083, P. R. China
| | - Shaojun Fang
- School of Metallurgy and Environment, Central South University, No.932 South Lushan Road, Changsha, Hunan, 410083, P. R. China
| | - Baohe Xu
- School of Metallurgy and Environment, Central South University, No.932 South Lushan Road, Changsha, Hunan, 410083, P. R. China
| | - Bao Zhang
- School of Metallurgy and Environment, Central South University, No.932 South Lushan Road, Changsha, Hunan, 410083, P. R. China
| | - Chunhui Wang
- School of Metallurgy and Environment, Central South University, No.932 South Lushan Road, Changsha, Hunan, 410083, P. R. China
| | - Zhiming Xiao
- School of Metallurgy and Environment, Central South University, No.932 South Lushan Road, Changsha, Hunan, 410083, P. R. China
| | - Guoqiang Zou
- Hunan Province Key Laboratory of Chemical Power Source, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Hongshuai Hou
- Hunan Province Key Laboratory of Chemical Power Source, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Xing Ou
- School of Metallurgy and Environment, Central South University, No.932 South Lushan Road, Changsha, Hunan, 410083, P. R. China
| | - Xiaobo Ji
- Hunan Province Key Laboratory of Chemical Power Source, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
| |
Collapse
|
2
|
Pandey P, Meena NK, Prakash A, Kumar V, Lynn AM, Ahmad F. Characterization of heterogeneous intermediate ensembles on the guanidinium chloride-induced unfolding pathway of β-lactoglobulin. J Biomol Struct Dyn 2019; 38:1042-1053. [PMID: 30880641 DOI: 10.1080/07391102.2019.1593245] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Folding pathway of β-LgA (β-lactoglobulin) evolves through the conformational α→β transition. The α→β transition is a molecular hallmark of various neurodegenerative diseases. Thus, β-LgA may serve as a good model for understanding molecular mechanism of protein aggregation involved in neurodegenerative diseases. Here, we studied the conformational dynamics of β-LgA in 6 M GdmCl at different temperatures using MD simulations. Structural order parameters such as RMSD, Rg, SASA, native contacts (Q), hydrophobic distal-matrix and free-energy landscape (FEL) were used to investigate the conformational transitions. Our results show that GdmCl destabilizes secondary and tertiary structure of β-LgA by weakening the hydrophobic interactions and hydrogen bond network. Multidimensional FEL shows the presence of different unfolding intermediates at 400 K. I1 is long-lived intermediate which has mostly intact native secondary structure, but loose tertiary structure. I2 is structurally compact intermediate formed after the partial loss of secondary structure. The transiently and infrequently buried evolution of W19 shows that intermediate conformational ensembles are structurally heterogeneous. We observed that the intermediate conformations are largely stabilized by non-native H-bonds. The outcome of this work provides the molecular details of intermediates trapped due to non-native interactions that may be regarded as pathogenic conformations involved in neurodegenerative diseases.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Preeti Pandey
- School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Naveen Kumar Meena
- School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Amresh Prakash
- School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Vijay Kumar
- Amity Institute of Neuropsychology & Neurosciences, Amity University, Noida, India
| | - Andrew M Lynn
- School of Computational & Integrative Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Faizan Ahmad
- Jamia Millia Islamia, Centre for Interdisciplinary Research in Basic Sciences, New Delhi, India
| |
Collapse
|