10.1002/anie.201908274
Angewandte Chemie International Edition
RESEARCH ARTICLE
high rate performance. The H-Ni-BTA electrodes showed the
lowest resistance of only ~1 Ω. Additionally, the resistance of L-
Ni-BTA and M-Ni-BTA electrodes increased during cycling,
which may be the reason that L-Ni-BTA and M-Ni-BTA
electrodes showed inferior cycling stability than that of H-Ni-BTA.
The capacity contribution[71-73] from diffusion-control or capacitive
effect was then analyzed by scanning the CV curves at different
scan rates. Clearly, all the three samples showed capacitive
effects (>70%, Figure S42 and Table S6). And the 2D nanosheet
morphologies of L-Ni-BTA gave higher contribution of capacitive
effects (Figure S43). Galvanostatic intermittent titration
technique (GITT) method was further used to investigate the
reaction kinetics. The results indicated that the calculated Na+
diffusion coefficient of three samples typically increased with the
quality of the materials (Figure S44), although the grain size of
H-Ni-BTA is larger than those of M-Ni-BTA and L-Ni-BTA. The
higher Na-ion diffusivity of H-Ni-BTA can probably be ascribed to
the high quality and the high crystallinity of H-Ni-BTA (ordered
ionic diffusion channel). These results indicated that the high
electrochemical performance of H-Ni-BTA is originated from the
high quality and high crystallinity of the samples and the
corresponding high Na-ion diffusivity.
(2017010201010141), Innovation Fund of WNLO and the
Fundamental Research Funds for the Central Universities
(HUST: 2017KFYXJJ023, 2017KFXKJC002, 2018KFYXKJC018,
2019kfyRCPY099). The authors sincerely appreciate Prof.
Daoben Zhu (ICCAS), Prof. Zhenxing Wang (HUST), Prof.
Liming Zheng (NJU) and Prof. Songsong Bao (NJU) for the
fruitful discussions and Ms. Fan Jiang (HUST) for language
polishing.
Keywords: π-d conjugated coordination polymers • organic
sodium-ion batteries • mechanism • Negishi cross-coupling •
single-atom catalyst
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In conclusion, we reported the 1D π-d conjugated
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Acknowledgements
This work was supported by the National Natural Science
Foundation of China (51773071), the National 1000-Talents
Program, Wuhan Municipal Science and Technology Bureau
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