Journal
CHEMICAL ENGINEERING JOURNAL
Volume 416, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.128338
Keywords
Integrated system; Zn-air batteries; H2O2 generation; Wastewater treatment
Categories
Funding
- National Natural Science Foundation of China [21978331, 21975292, 21905311]
- National Key Research and Development Program of China [2016YFB0101200]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010343]
- Tiptop Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2016TQ03N322]
- Fundamental Research Funds for Central Universities [19lgpy136]
- China Postdoctoral Science Foundation [2019M653142]
- ARC [DP190103881, FL190100126]
- Australian Research Council [FL190100126] Funding Source: Australian Research Council
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The study focused on the development of an integrated system using novel carbon-based electrocatalysts for oxygen reduction reactions in Zn-air batteries and in-situ degradation of pollutants in wastewater. The newly-developed catalysts showed high selectivity and efficiency in producing H2O2, which led to promising results in pollutant degradation, indicating potential for practical applications in wastewater treatment.
The overuse of fossil fuel has caused a serious energy crisis and environmental pollution. In this study, we rationally devised an integrated system, in which novel earth-abundant metal-free carbon-based electrocatalysts were used to catalyze oxygen reduction reaction (ORR) in Zn-air batteries for renewable energy storage as a power source for electrochemical generation of H2O2 as an oxidant for in-situ degradation of pollutants in wastewater. It was noted that the newly-developed ordered mesoporous carbon (OMC) and N-doped OMC (NOMC) exhibited high selectivity for 2e(-) ORR to produce H2O2 and high selectivity for 4e(-) ORR at the cathode of Zn-air batteries, respectively. The OMC electrode showed a H2O2 yield as high as 366.9 mg/L in 2 h at 0.5 V, leading to a high current efficiency similar to 73.6%, The subsequent use of thus-produced H2O2 for Rhodamine B (RhB) candidate pollutant degradation exhibited an 90% removal efficiency in 2 h, showing a great promise for practical wastewater treatment. This work represents a breakthrough in the development of a new concept and novel integrated systems to address the current energy and environmental changes.
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