Journal
APPLIED SURFACE SCIENCE
Volume 532, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147381
Keywords
Dual-metal material system; Ni-Co alloy; NiCo boride; B doping graphitization structure; Oxygen evolution reaction
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Funding
- National Natural Science Foundation of China [51262027]
- State Key Laboratory of Solidification Processing of northwest normal university [SKLSP201754]
- Science and Technology Project [17YF1GA017, 17JR5RA082]
- Research Project of Higher Education of Gansu Province [2017A002]
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Designing and construction of efficient and robust non-noble-metal electrocatalysts for oxygen evolution reaction (OER) is a pivotal approach in water splitting process. This work developed the dual-metal material system of Ni-Co nanoparticles wrapped in B-doped carbon (Ni1Co3@BC) through simple and economical pyrolysis process for nanosheets NiCo metal-organic framework (Ni1Co3-BDC) precursor. The constitution and structure of characterization were characterized by X-ray diffraction, X-ray photoelectron spectroscopy scanning electron microscope and transmission electron microscope, indicating the homogeneous alloy and less metal boride phase and B doped graphitization structure for Ni1Co3@BC. An optimized Ni1Co3@BC exhibited extraordinary OER performance, providing an overpotential as small as 309 mV at a current density of 10 mA cm(-2), a low Tafel slope of 62 mV dec(-1) and excellent stability in 1.0 M KOH solution, which attributed to the synergistic effect of inner NiCo alloy, NiCo boride nanoparticles and external B doping carbon structure. The formation of B doped carbon layer not only provides additional active sites but also protects inner metal alloys. This work clearly stated the design and synthesis of desired-morphology features catalysts from controlled MOFs for energy conversation and storage.
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