P doped CoMoO4/RGO as an efficient hybrid catalyst for hydrogen evolution |
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| Affiliation: | 1. School of Chemistry and Materials Science, Jinan University, Guangzhou 510632, PR China;2. Guang Dong DejiuSolar New Energy Co.,Ltd, PR China;1. School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou, 510641, PR China;2. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899-6102, USA;1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, PR China;2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, 130022, PR China;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China;2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China;3. Tianjin Mainland Hydrogen Equipment Co., LTD., Tianjin 300072, PR China;1. Nanomaterials and System Lab, Faculty of Applied Energy System, Science and Engineering College, Jeju National University, Jeju 690-756, South Korea;2. Nanomaterials and System Lab, Department of Mechanical Engineering, Jeju National University, Jeju 690-756, South Korea;3. Department of Nuclear & Energy Engineering, Jeju National University, Jeju 690-756, South Korea;4. Department of Mechatronics Engineering, Jeju National University, Jeju 690-756, South Korea |
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| Abstract: | Transition metal oxides, as newly earth-abundant and low-cost catalysts, have been regarded as promising materials for electrocatalytic oxygen evolution. However, they are rarely used as an electrocatalyst in hydrogen evolution reaction (HER) due to the poor HER activity. Herein, we present a facile two-step method to synthesize P doped CoMoO4/RGO (P-CoMoO4/RGO) with different atomic ratios of Co2+/Co3+ through a simple phosphorization strategy by changing the mass of NaH2PO2. The effective P-doping into CoMoO4/RGO can modify the electronic properties and modulate the atomic ratio of Co2+/Co3+, which promotes the electron transfer and creates more activity sites. Therefore, the optimized P-CoMoO4/RGO with a relatively larger atomic ratio of Co2+/Co3+ shows superior HER performances in alkaline media, which affords a current density of 10 mA cm−2 at a small overpotential of 90 mV and a low Tafel slope of 62 mV dec−1 along with having satisfactory long-term stability. This work provides a valuable route to enhance the HER activity of transition metal oxides. |
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| Keywords: | Electrocatalysis Reduced graphene oxide Hydrogen evolution reaction Phosphorus-doping |
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