Abstract
The oxygen evolution reaction (OER) is a complex multi-step four-electron process showing sluggish kinetics. Layered double hydroxides (LDH) were reported as promising catalysts for the OER, but their low electrical conductivity restricts their widespread applications. To overcome this problem, a composite material containing Mn-Co LDH ultrathin nanosheet and highly conductive graphene was synthesized for the first time. Benefited from the high electrocatalytic activity and the superior charge transfer ability induced by these components, the new material shows superior OER activity. Used as the OER catalyst, a high current density of 461 mA cm−2 at 2.0 V vs. RHE (reversible hydrogen electrode) was measured besides shows a low overpotential of 0.33 V at 10 mA cm−2. Moreover, the new composite also shows a superior bifunctional water splitting performance as catalyst for the OER and HER (hydrogen evolution reaction) catalysts. Our results indicate that the presented material is a promising candidate for water splitting which is cheap and efficient.
Highlights
Growing energy consumption and global environmental concerns have attracted lots of interests in seeking clean and sustainable energy sources
Inspired by the superior oxygen evolution reaction (OER) catalytic activity, the catalytic performance for complete water splitting process was investigated by loading MnCo-G and MnCo onto a nickel foam (NF) substrate
10 mg of Layered double hydroxides (LDH) was dispersed into the deionized water and 2 mL of graphene suspension was added into the dispersion agent
Summary
Growing energy consumption and global environmental concerns have attracted lots of interests in seeking clean and sustainable energy sources. Noble metals and their oxides based on Ir and Ru are the state-of-art OER catalysts Their limited reserve and high price restrict their practical applications [19]. As an ideal 2D conductive material, graphene with its atomic thickness, chemical stability, large surface area, and good conductivity has been regarded as an excellent substrate for LDH [41,42] In this respect, the combination of LDH with highly conductive graphene is expected to realize higher charge-transfer ability and achieve a superior water oxidation performance. The low thickness should reduce the charge transport pathway, improving OER performance Upon this view, the composite containing active ultrathin LDH and highly conductive graphene is assumed to be an ideal candidate to enhance OER performance. The composite shows superior bifunctional water splitting performance as both OER and HER catalysts, exhibiting it as a highly active material for OER
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