Integrating energy-saving hydrogen production with methanol electrooxidation over Mo modified Co4N nanoarrays
| Autor: | Hongye Qin, Lifang Jiao, Xuchun Chen, Tongzhou Wang, Jinhong Li, Xuejie Cao |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Materials science Hydrogen Renewable Energy Sustainability and the Environment Oxygen evolution chemistry.chemical_element General Chemistry Overpotential Electrocatalyst Bifunctional catalyst chemistry Chemical engineering Water splitting General Materials Science Hydrogen production |
| Zdroj: | Journal of Materials Chemistry A. 9:21094-21100 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | The intrinsically sluggish kinetics of the anodic oxygen evolution reaction (OER) is deemed to be the bottleneck for highly efficient electrocatalytic hydrogen production, and the by-product is less value-added oxygen. Herein, we report rational construction of Mo doped Co4N nanoarrays (Mo-Co4N) with an open skeleton structure as a robust bifunctional electrocatalyst for concurrent electrolytic high-purity hydrogen and value-added formate productions in the cathodic and anodic process. Benefitting from Mo doping, the unique structure characteristics of more exposed active sites, and optimized electronic synergy, Mo-Co4N exhibits intriguing hydrogen evolution reaction (HER) activity with an exceptionally small overpotential of 45 mV at 10 mA cm−2 and a low Tafel slope of 42 mV dec−1. Meanwhile, when the anodic partial methanol oxidation reaction (MOR) is used to replace the OER, the oxidation potential is significantly reduced to 1.356 V at 10 mA cm−2. In particular, a two-electrode electrolyzer employing Mo-Co4N as a bifunctional catalyst only requires an ultralow cell voltage of 1.427 V to achieve a current density of 10 mA cm−2, featuring low energy consumption in comparison to traditional overall water splitting. Furthermore, high Faraday efficiencies approaching 100% for hydrogen evolution and value-added formate production are achieved, as well as excellent 60 h long-term durability. |
| Databáze: | OpenAIRE |
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