Abstract
Ni,Co-MOFs have been synthetized by a simple hydrothermal method. Subsequently, Co,Ni/N-doped porous carbon have been prepared by pyrolysis method using the Ni,Co-MOFs as precursor. The results show that the samples present high degree of graphitization. The Co-1–Ni-0.5/NC possesses the largest BET surface area (94.73 m2/g) and pore volume (0.456 cm3/g). The Co-1–Ni-0.5/NC presents the smallest HER overpotential (179 mV) and the best electrocatalytic activity for HER. The Co-0.5–Ni-0.5/NC and Co-1–Ni-0.5/NC have the relatively low overpotential for OER, which are about 348 mV and 383 mV, respectively. The smallest Tafel slope value indicates that Co-1–Ni-0.5/NC presents the best electrocatalytic reactive kinetics. Excellent electrocatalytic performance may be attributed to the more active sites, the higher specific surface area and mesopores as well as the lower charge-transfer resistance. The excellent HER and OER of Co-1–Ni-0.5/NC make its potential to be used on overall water splitting.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Nos. 51701001, 61804039, 51802145), Academic funding projects for Top Talents in Subjects (Majors) of Universities (No. gxbjZD31), Natural Science Foundation of Anhui Higher Education Institution of China (KJ2019A0734, KJ2017A924, KJ2017A002, KJ2019A0735), Natural Science Foundation of Anhui Province (No. 1808085QE126) and Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province(Grant No. 2020GDTCZD01), Provincial quality engineering project of colleges and universities in Anhui Province (2020jxtd210).
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Shen, X., Tan, W., Wei, Z. et al. Co-modified Ni/N-doped carbon as electrocatalysts for HER and OER. J Mater Sci: Mater Electron 32, 22974–22983 (2021). https://doi.org/10.1007/s10854-021-06782-w
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DOI: https://doi.org/10.1007/s10854-021-06782-w