Yan-Bo Cao,Yan-Peng Ye,Wei-wei Dong,Zhi-biao Li,Yi Ding,Wei-li Kong,Xi Wang
Hydrogen, a new energy source that emits no carbon and has a high energy content, has recently attracted significant attention. The CoS 2 /MoS 2 catalyst was produced using a one-step hydrothermal synthesis process. With a current density of 10 mA cm −2 , the CoS 2 /MoS 2 catalyst shows an overpotential of 116.8 mV for the HER under the 300 W Xe lamp's solar simulation, a 23 % improvement over the dark condition. Both the properly prohibited bandwidths of CoS 2 and MoS 2 , which promote the creation of photogenerated carriers and the existence of a p-n junction between them, are responsible for improving the photo-enhanced HER performance. The photoinduced electro-hole pairs' separation is improved by this p-n junction, reducing their likelihood of recombination and thereby enhancing the electrocatalytic ability of the system. This work demonstrates the possibility of photoelectric synergistic enhancement of the electrocatalytic performance of transition metal sulfides.
Yanjun Guo,Chuan Cao,Lixia Zheng,Yuxiang Zhong,Pingzhou Duan,Xiang Hu
A MOF-derived carbon/metal oxide composite (Fe/Ce@NPC-600) by doping Ce into NH 2 -MOF-101(Fe) precursor and simple one-step carbonization was fabricated. Fe/Ce@NPC-600 as a floating cathode was innovatively applied to the solar photoelectro-Fenton (SPEF) process to increase the yield of H 2 O 2 and activate it for degradation tetracycline (TC). The characterizations showed that the presence of Ce greatly increased the content of Fe 2+ and photoresponse ability in the material. Thanks to the synergistic effect of Fe and Ce, Fe/Ce@NPC-600 cathode could efficiently degrade TC by 98.2 % within 30 min, and the removal rate of total organic carbon (TOC) was 68.2 %, and the photoelectric synergistic enhancement factor ( f PEF ) was 1.4. Besides, based on machine learning, a XGB model was established to predict electrode performance. The degradation mechanism and pathway of TC were also proposed. Our results inspired the application of floating cathodes, MOF-derived materials and artificial intelligence for advanced oxidation processes for efficient removal of emerging contaminants.
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