No abstract

Poly(thiophene) as a kind of n-doped conjugated polymer with reversible redox behavior can be employed as anode material for lithium-ion batteries (LIBs). However, the low redox activity and poor rate performance for the poly(thiophene)-based anodes limit its further development. Herein, a structure-design strategy is reported for thiophene-containing conjugated microporous polymers (CMPs) with extraordinary electrochemical performance as anode materials in LIBs. The comparative study on the electrochemical performance of the structure-designed thiophene-containing CMPs reveals that high redox-active thiophene content, highly crosslinked porous structure, and improved surface area play significant roles for enhancing electrochemical performances of the resulting CMPs. The all-thiophenebased polymer of poly(3,3′-bithiophene) with crosslinked structure and a high surface area of 696 m 2 g −1 exhibits a discharge capacity of as high as 1215 mAh g −1 at 45 mA g −1 , excellent rate capability, and outstanding cycling stability with a capacity retention of 663 mAh g −1 at 500 mA g −1 after 1000 cycles. The structure-performance relationships revealed in this work offer a fundamental understanding in the rational design of CMPs anode materials for high performance LIBs.

No abstract

No abstract

No abstract

No abstract

Rational design and controllable synthesis of multiple metal components according to chemical composition and morphology are essential for obtaining desirable electrochemical performance for efficient hydrogen production because of the morphology and synergistic effects of different components. Herein, we report an approach to facilely fabricate bimetal compounds with a well-defined hollow nanoprism structure using a self-templated strategy to synthesize novel hierarchical NiCo-layered double hydroxide (NiCo-LDH) nanosheets as precursors followed by in situ phosphorization. Among the as-synthesized products of different mole ratios of Ni/Co, the NiCo 2 −B−P nanoprisms that integrate the advantages of a hollow structure, an optimal Ni−Co synergistic effect, and a unique Bdoped CoP/Ni 2 P bimetallic phosphide derived from NiCo-LDH nanosheets exhibit excellent hydrogen evolution reaction (HER) activity in an alkaline solution at 10 mA cm −2 with the lowest overpotential of 78 mV and long-term stability. This study may offer an appropriate structure and compositional design of bimetallic alkaline HER catalysts.

No abstract