Researchers create stereodefined N and S atom-codoped graphdiyne for oxygen evolution

The oxygen evolution reaction (OER) is of extraordinary hugeness in energy-related methods, for example, metal-air batteries and water splitting. Chinese researchers have doped site-characterized sp-N and S atoms into graphdiyne, which empowers exceedingly active catalysis of OER. Their discoveries were published in J. Am. Chem. Soc.

Traditional OER catalysts, for example RuO2 and IrO2, are constrained by high expense and declining dependability. Heteroatom-doped carbon materials, particularly double doping, have shown fascinating potential for very proficient electrocatalysis owing from the synergistic impact. In any case, the doping sites for various atoms are highly uncontrollable, which makes the structure-property study troublesome.

The synergistic impact can just occur inside a specific separation between the double atoms, and 7.5 Å is the upper limit for N and S atoms to obtain a strong synergistic effect.

Researchers from the Institute of Process Engineering (IPE) of the Chinese Academy of Sciences effectively arranged “stereodefined” N and S atoms codoped graphdiyne, and the relative positions of the N and S atoms were well controlled.

“N-, S-codoped graphdiyne presented higher catalytic activity than those catalysts with individual-element doping (N or S atom) and commercial RuO2 in catalyzing the OER, possessing lower overpotential (299 mV) and higher current density (47.2 mA/cm2, 1.6 V), ” said WANG Dan, who led this research.

This study opens an avenue for understanding the synergistic impacts in heteroelement-doped metal-free catalysts, and for further directing the rational design and preparation of highly efficient catalysts for energy conversion and storage.

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