Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 45, Pages 38906-38914Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b13542
Keywords
metal-organic framework; hierarchical arrays; Ni-NiO interface; electrolysis; water splitting
Funding
- National Basic Research Program of China [2015CB932304, 2016YFA0202603]
- NSFC [91645104]
- Science and Technology Program of Guangzhou [201704030019]
- Natural Science Foundation of Guangdong Province [2017A010103007]
- Guangdong Science and Technology Innovation Leading Talent Fund [2016TX03N187]
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Searching for an economical and efficient water splitting electrocatalyst is still a huge challenge for hydrogen production. This work reports one-step synthesis of hierarchical porous prism arrays (HPPAs) composed of Ni-NiO nanoparticles embedding uniformly in graphite carbon (Ni-NiO/C HPPAs), which is derived from metal-organic framework (CPO-27-Ni) prism arrays grown on nickel foam (NF). Remarkable features of the prism arrays, synergistic effect of Ni-NiO/C, porous graphite carbon, high conductive NF, and good contact between catalyst and current collector result in excellent electrocatalytic performance of Ni-NiO/C HPPAs@NF. Ni-NiO/C HPPAs@NF shows a small overpotential of similar to 49.48 mV at the current density of 10 mA cm(-2), low Tafel slope of 74 mV dec(-1) and robust stability for hydrogen evolution reaction (HER) in alkaline media. Especially, the overpotential for HER of Ni-NiO/C HPPAs@NF is only similar to 132 mV at the current density of 185 mA cm(-2), almost the same as the value from the Pt/C. Furthermore, for oxygen evolution reaction in basic media, Ni-NiO/C HPPAs@NF shows better catalytic activity, lower Tafel slope and higher durability than precious IrO2. The above finding offers an effective strategy to design the bifunctional electrocatalysts for overall water splitting.
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