Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 38, Pages 18378-18383Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta04615h
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Funding
- National Natural Science Foundation of China [21671030, 21531001]
- 111 Project [B16008]
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Generation of doping induced defects in electrocatalysts is becoming an effective strategy for the highly efficient electrocatalytic oxygen evolution reaction (OER). Herein, Mg doped Ni layered double hydroxides (NiMg-LDHs) were prepared by a novel 2-methyl-imidazole-assisted solvothermal route. Mg-induced generation of oxygen vacancies in the NiMg-LDH host layers during the synthetic process is accountable for the improvement of electron transfer and OH- anion adsorption during electrolysis. Thus NiMg-LDHs exhibit an enhanced performance for the electrocatalytic OER with a low over-potential (eta(10): 254 mV) at a current density of 10 mA cm(-2) and high mass activity (56.3 A g(-1)) at an overpotential of 321 mV. The electro-catalytic activity was further improved after introducing reduced graphene oxide (rGO) to form hybrid composites of NiMg-LDHs/Go with decreasing of eta(10) to 232 mV. This finding highlights the promise of s-block metals in regulating electrocatalytic activity for the OER, which is helpful for extending the scope of superior electrocatalysts in energy-related fields.
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