Synthesis of biomass-derived carbon sheets decorated with metal nanoparticles and their catalytic performance in the oxygen evolution reaction
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摘要: 本文以吸附了金属离子（Ni、Fe离子）的明胶为碳源，采用高温炭化的方法，制备了明胶衍生的富氮炭负载NiFe合金的功能化复合物（NiFe-NC）。采用X射线衍射、扫描电镜、透射电镜、热重分析、电化学线性扫描等表征手段对NiFe-NC的形貌、结构和电催化析氧性能进行表征和研究。结果表明，金属纳米颗粒均匀负载在炭片的表面，暴露出了更多的活性位点，从而改善和强化了电化学反应动力学过程，提高了其作为析氧反应催化剂的催化性能和稳定性。在10 mA cm-2电流密度下，过电势仅为366 mV，Tafel斜率为46.6 mV dec-1，并在5 mA cm-2的电流密度下能够稳定工作25 h以上。Abstract: Biomass-derived carbons decorated with ultrafine metal nanoparticles were prepared by the carbonization of gelatin that had absorbed Ni and/or Fe ions. The morphology and structure of the samples were characterized by XRD, SEM, TEM, and their catalytic performance for the oxygen evolution reaction was evaluated by linear sweep voltammetry, electrochemical impedance spectroscopy and the Tafel polarization test. Results indicate that the metal nanoparticles are uniformly loaded on the carbon sheets. The FeNi alloy/carbon (FeNi/C) nanocomposite has the highest current density of 10 mA cm-2 at the lowest overpotential of 366 mV, and features the smallest Tafel slope of 46.6 mV dec-1 and the lowest charge transfer resistance of 13.76 ohm. Moreover, the FeNi/C nanocomposite also exhibits a long-term stability and is able to operate at 5 mA cm-2 for 25 h. The combination of conductive carbon sheets, uniformly loaded FeNi nanoparticles and abundant pores is responsible for the increased catalytic activity and fast reaction kinetics of the FeNi/C nanocomposite for the oxygen evolution reaction.
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Key words:
- Biomass-derived Carbon /
- NiFe alloy /
- Oxygen evolution reaction /
- Water splitting /
- Electrocatalysis
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