期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 6, 页码 4771-4777出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b00153
关键词
Water splitting; Oxygen evolution; Hydrogen evolution; Nickel; Electrocatalyst
资金
- National Natural Science Foundation of China [51572227]
- Sichuan Youth Science and Technology Foundation [2013JQ0012]
- Major Cultivating Foundation of Education, Department of Sichuan Province [17CZ0036]
electrocatalystsThe development of cheap and efficient electrocatalysts for promoting full water splitting is still challenging. Here, we report a composite architecture that consists of onion-like ultrathin graphene shells encapsulating uniform metallic nickel nanoparticles (Ni@graphene) derived by a straightforward thermal treatment of a Ni-based metal organic framework in an inert atmosphere. The resulting Ni@graphene is highly catalytically active for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in 1.0 M KOH solutions. It only requires relatively low overpotentials (OER 370 mV; HER 240 mV) to yield a catalytic current of 10 mA/cm(2), which compares favorably to most previously reported Ni-based elecrocatalysts for water splitting. The excellent performance would be attributed to the catalytic sites of metallic Ni and the intact metal protection effect of the outer graphene layers.
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