Home > News > Small: CO and Co9S8 in carbon nanotubes: a three function electrocatalyst for water splitting in zinc air battery

Small: CO and Co9S8 in carbon nanotubes: a three function electrocatalyst for water splitting in zinc air battery

wallpapers News 2020-12-23
With the gradual depletion of "spkds" other fossil energy storage devices more more attention has been paid. However their performance is strongly restricted by the electrocatalysts for oxygen reduction reaction (ORR) oxygen evolution reaction (OER) hydrogen evolution reaction (her). Therefore it is urgent to develop efficient stable three-function electrocatalyst. The composition structure of catalysts (such as the type number of active sites) directly affect the catalytic performance of materials. High specific surface area reasonable pore size distribution are beneficial to the exposure of active sites. Monatomic catalyst is an ideal catalyst for maximizing the atomic efficiency in catalytic reaction due to its high atomic utilization rate can be used as an efficient electrocatalyst. However the performance of monatomic catalysts needs to be further improved. It is difficult for a single kind of monatomic active site to meet the requirements of orr oer her at the same time. The catalytic performance can be further improved by the potential synergy between the single atom active site other active sites. On the other h transition metal sulfides are often used to construct efficient electrocatalysts among which Co9S8 nanoparticles show great potential in electrocatalysis due to their unique structure. The combination of single atom catalyst Co9S8 nanoparticles may broaden the catalytic performance obtain high efficiency three function electrocatalyst. Recently Professor Yuan Kai Professor Chen Yiwang of Nanchang University have developed a self sacrificing template strategy. Zinc sulfide nanorods of zif-67 were coated with polydopamine as precursor carbon nanotubes (COSA Co9S8 / HCNT) enriched with monoatomic kon4 Co9S8 nanoparticles were successfully prepared by one-step pyrolysis. In the pyrolysis process ZnS is used as a self sacrificial template to provide s source which is reduced to Zn vapor to volatilize as pore forming agent creating a hollow structure with rich porosity. The COSA Co9S8 / HCNT catalysts were characterized by X-ray absorption fine structure spectroscopy spherical aberration transmission electron microscopy. The results showed that the prepared catalysts were rich in monatomic con4 Co9S8 nanoparticles. Therefore the unique composition structure of cosa Co9S8 / HCNT give it excellent catalytic performance stability in orr / oer / her. The Δ e of cosa Co9S8 / HCNT was 0.705 V which was lower than that of Pt RuO2 (0.777 V). Theoretical calculation shows that the synergistic effect of Co9S8 nanoparticles single atom con4 can optimize the electronic configuration of the active site of con4 reduce the reaction barrier accelerate the reaction kinetics promote the catalytic performance of orr oer her at the same time. A zinc air battery with high power density (177.33 mW cm − 2) high stability was constructed by using cosa Co9S8 / HCNT as electrode material to drive efficient water splitting (the potential is 1.59 V at a current density of 10 Ma cm-2). This study provides a good reference guidance for the preparation of multifunctional electrocatalyst the research of related energy devices.


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