期刊
CHEMICAL ENGINEERING JOURNAL
卷 390, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124525
关键词
Layered double hydroxides; Fullerene quantum dot; Electrocatalyst; Overall water splitting; Urea oxidation reaction
资金
- National Natural Science Foundation of China [21603243, 21701107, 21103224, 21878227]
- Beijing National Laboratory for Molecular Sciences [BNLMS201805]
- Natural Science Foundation of Shaanxi Province [2019JQ-203]
- Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry [KFKT2019-06]
- National Key R&D Program of China [2017YFB0308300]
- Natural Science Foundation of Hebei Province of China [B2019202210]
- Natural Science Foundation of Shaanxi Provincial Department of Education [17JK0093]
- Xi'an Key Laboratory of green manufacture of ceramic materials Foundation [2019220214SYS017CG039]
- 1000 Youth Talents Plan of Shaanxi Province
- Platform Construction Fund for Imported Talent of Shaanxi University of Science and Technology [134080038]
- Youth Talents of Shaanxi University of Science and Technology [2016QNBJ-14]
The design and construction of noble-metal-free electrocatalysts with superior activity, high efficiency and robust stability is still a big challenge for overall water and urea splitting. Herein, a novel hybrid electrocatalyst comprising fullerene quantum dot (FQD)-decorated CoNi layered double hydroxides (CoNi-LDH) nanosheet arrays anchored on porous Ni foam (NF) is elaborately fabricated. Beneficial from the synergetic effect between FQD and CoNi-LDH, the obtained FQD/CoNi-LDH/NF exhibits superior electrocatalytic activity for hydrogen and oxygen evolution as well as urea oxidation under ambient atmosphere. Impressively, to drive a current density of 10 mA cm(-2), it requires cell voltages of only 1.59 and 1.45 V for overall water and urea electrolysis, respectively, in a two-electrode electrolyzer consisting of FQD/CoNi-LDH/NF as both anode and cathode. Furthermore, this catalyst also displays outstanding reaction kinetics and favorable catalytic stability. Both experimental and density functional theory (DFT) calculation results demonstrate that the charge transfer from FQD to CoNi-LDH could account for the excellent catalytic performance of the newly-synthesized catalyst, and the decorated FQD finely modulates the electronic structure of CoNi-LDH, favoring the adsorption of active hydrogen atom, and thus promote the catalytic process. The present work would provide useful guidance for designing and developing multifunctional and efficient electrocatalysts for hydrogen production.
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