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Issue 11, 2018
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Heteroatomic interface engineering in MOF-derived carbon heterostructures with built-in electric-field effects for high performance Al-ion batteries

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Abstract

Confronted with challenges in promoting fast AlxCly anion diffusion and intercalation for aluminum ion batteries (AIBs), it is of vital importance to rationally design gradient hetero-interfaces with an ideal built-in interfacial electric potential to enhance charge diffusion and transfer kinetics. Herein, we demonstrate an effective strategy to realize accurate tuning gradient heteroatom N and P doping in MOF-derived porous carbon in C@N-C@N,P-C graded heterostructures. Importantly, gradient N and P doping could modify the electronic structure of MOF-derived carbon as certified by DFT calculations, and lead to charge redistribution to induce graded energy levels and a built-in electric field in the C@N-C@N,P-C graded heteroatomic interface, thus boosting interfacial charge transfer and accelerating reaction kinetics. Furthermore, the large surface area and high porosity of C@N-C@N,P-C graded heterostructures could efficiently absorb electrolyte and enhance anion transport kinetics. As expected, the designed gradiently N,P-doped C@N-C@N,P-C heterostructure with a built-in interfacial electric field could facilitate electron and AlCl4 anion transfer spontaneously between N,P-C, N-C and C gradient components, exhibiting a superior capacity of 98 mA h g−1 at a high current density of 5 A g−1 after 2500 cycles. This strategy reveals new insights about the gradient energy band for designing high-performance electrochemical energy storage devices.

Graphical abstract: Heteroatomic interface engineering in MOF-derived carbon heterostructures with built-in electric-field effects for high performance Al-ion batteries

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Supplementary files

Article information


Submitted
09 Apr 2018
Accepted
15 Jun 2018
First published
16 Jun 2018

Energy Environ. Sci., 2018,11, 3201-3211
Article type
Paper

Heteroatomic interface engineering in MOF-derived carbon heterostructures with built-in electric-field effects for high performance Al-ion batteries

C. Li, S. Dong, R. Tang, X. Ge, Z. Zhang, C. Wang, Y. Lu and L. Yin, Energy Environ. Sci., 2018, 11, 3201
DOI: 10.1039/C8EE01046C

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