Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 11, Issue 11, Pages 3201-3211Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ee01046c
Keywords
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Funding
- State Key Program of National Natural Science of China [51532005]
- National Nature Science Foundation of China [51532005, 51472148, 51272137]
- Tai Shan Scholar Foundation of Shandong Province
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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 AlCI(4)(- )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.
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