3D 氮掺杂多孔碳载Pt催化剂对葡萄糖催化氧化性能研究

3D Nitrogen-Doped Porous Carbon Supported Pt Catalyst for Electrocatalytic Oxidation of Glucose

葡萄糖燃料电池因其能够持续产生电能而在生物医用领域受到人们广泛关注。该技术的发展在为植入式医疗设备供电的应用中具有很大潜力。但燃料电池中阳极发生的葡萄糖氧化反应效率低, 需要添加催化剂以提高反应效率。铂 (Pt) 催化剂在使用过程中容易团聚而限制了其催化活性和稳定性等性能的提高。针对此问题, 本文以ZIF-8为前驱体制备了具有较大比表面积的三维 (3D) 氮掺杂多孔碳 (NCZIF-8) 材料作为催化剂载体, 在其上负载质量分数为10%的铂纳米粒子 (Pt NPs) , 制备10%Pt/NCZIF-8复合材料。利用XRD、SEM、TEM、Raman和FT-IR等方法对材料进行结构表征, 利用电化学工作站对其电化学性能进行测试。研究表明NCZIF-8载体的加入提高了Pt纳米粒子的分散程度, 提高了催化剂的利用率, 使其在电催化葡萄糖氧化过程中具有良好的催化活性和稳定性。经过300次的循环伏安 (CV) 测试, 10%Pt/NCZIF-8的峰值电流密度在双电层和氧化物区域的电流密度仅下降了21. 12%和8. 59%, 表明该催化剂具有优异的稳定性。这种低载量的贵金属催化剂通过提高催化剂利用率, 不仅能够提高催化效率还能降低材料成本, 在实际应用中极具潜力。

Glucose fuel cells have attracted widespread attention in the biomedical field due to their ability to generate electrical energy continuously. The development of this technology has great potential in the application of powering implantable medical devices. However, the efficiency of the glucose oxidation reaction at the anode of the fuel cell is low, and a catalyst needs to be added to improve the reaction efficiency. Platinum (Pt) catalysts are prone to agglomerate during use, which limits the improvement of their properties such as catalytic activity and stability. To address this problem, in this paper, a three-dimensional ( 3D) N-doped porous carbon (NCZIF-8) material with a large specific surface area was prepared as a catalyst carrier using ZIF-8 as a precursor. Low loading rate of platinum (10 wt. %) was prepared (10% Pt/NCZIF-8) and used as catalysts for glucose oxidation reaction. The materials were structurally characterized by XRD, SEM, TEM, Raman and FT-IR, etc. The electrocatalytic properties of the materials were characterized using an electrochemical workstation. It was shown that the incorporation of NCZIF-8 carrier promotes the dispersion of Pt nanoparticles (NPs) and the utilization of the catalyst, which enhances the catalytic activity and stability of catalysts during electrocatalytic glucose oxidation. After 300 times cyclic voltammetry (CV) tests, the peak current density of 10% Pt/NCZIF-8 only decreased by 21. 12% and 8. 59% in the double-layer region and oxygen region, respectively, indicating the excellent stability of the catalyst. This kind of catalyst with low loading rate of precious metal has great potential for its practical application by improving catalyst utilization, which not only improves the catalytic efficiency but also reduces the material cost.