期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202100586
关键词
bidirectional conversion reactions; graphene chainmail; Li; S batteries; operando X‐ ray diffraction; ternary heterostructure
类别
资金
- National Natural Science Foundation of China [51702225]
- National Key RAMP
- D Program of China [2019YFA0708201, 2016YFA0200103]
- China Post-Doctoral Foundation [7131705619]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
The ternary graphene-TiO2/TiN heterostructure is an efficient and robust electrocatalyst for accelerating sulfur redox kinetics, providing abundant anchoring points and sustained active sites for smooth bi-directional electrocatalysis.
Designing high-performance electrocatalysts for boosting aprotic electrochemistry is of vital importance to drive longevous Li-S batteries. Nevertheless, investigations on probing the electrocatalytic endurance and protecting the catalyst activity yet remain elusive. Here, a ternary graphene-TiO2/TiN (G-TiO2/TiN) heterostructure affording conformal graphene chainmail is presented as an efficient and robust electrocatalyst for expediting sulfur redox kinetics. The G-TiO2/TiN heterostructure synergizes adsorptive TiO2, catalytic TiN, and conductive graphene armor, thus enabling abundant anchoring points for polysulfides and sustained active sites to allow smooth bi-directional electrocatalysis. Encouragingly, in situ crafted graphene chainmail ensures favorable protection of inner TiO2/TiN to retain their catalytic robustness towards durable sulfur chemistry. As expected, sulfur cathodes mediated by ternary G-TiO2/TiN harvest an impressive rate capability (698.8 mAh g(-1) at 5.0 C), favorable cycling stability (a low decay of 0.054% per cycle within 1000 cycles), and satisfactory areal capacity under elevated loading (delivering 8.63 mAh cm(-2) at a sulfur loading of 10.4 mg cm(-2)). The ternary heterostructure design offers an in-depth insight into the electrocatalyst manipulation and protection toward long lifespan Li-S batteries.
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