Journal
CHEMICAL ENGINEERING JOURNAL
Volume 409, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.128184
Keywords
Carbon dot; Photocatalytic hydrogen evolution; Hydrogen peroxide production; Electron storage; Normal pressure
Categories
Funding
- National MCF Energy RD Program [2018YFE0306105]
- National Key Research and Development Project of China [2020YFA0406104]
- National Natural Science Foundation of China [51725204, 21771132, 51972216, 52041202, 51821002]
- Natural Science Foundation of Jiangsu Province [BK20190041]
- Key-Area Research and Development Program of GuangDong Province [2019B010933001]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
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This study demonstrates that carbon dots can stabilize and store photogenerated electrons, promote effective charge separation, and improve the activity and stability of photocatalysts. The Ni2P/CDs composite photocatalyst synthesized in this work can simultaneously produce H-2 and H2O2 under atmospheric conditions with high yields.
Photo-production of hydrogen (H-2) and hydrogen peroxide (H2O2) simultaneously from water catalytic-splitting has received widespread attention. Most photocatalysts suffer from H2O2 poisoning and rapid recombination of photogenerated electrons and holes. Although photocatalysts against H2O2 poisoning have been prepared, the long-time stability of photogenerated electrons is still a great challenge. Here, we demonstrate that carbon dots (CDs) can stabilize and store the photogenerated electrons, promote the effective separation of photo-generated charges, and improve the photocatalytic activity and stability of the catalyst. The Ni2P/CDs composite photocatalyst synthesized in this work can produce H-2 and H2O2 simultaneously under atmosphere, and the yields of H-2 and H2O2 can reach 258.6 mu mol/h/g and 1281.4 mu mol/h/g, respectively. It represents the highest yield of H2O2 ever reported in photocatalysts capable of producing both H-2 and H2O2 simultaneously under normal pressure. This work provides some deep insight on the storage and stability of photogenerated electrons, and open up a new way for the high efficient photocatalyst design based on the regulation of the interface charge dynamics.
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