Ce-CoFe-P@CC纳米复合催化体系的OER性能

doi:10.12422/j.issn.1006-396X.2024.03.007

摘要/Abstract

摘要：

对粉末电催化剂进行电催化性能测试时通常需要加入黏合剂，该测试容易导致催化剂电阻增加，催化剂负载量减少，并且在长时间测试下催化剂容易被剥离。采用一步水热法使Ce掺杂CoFe层状双金属氢氧化物在碳布上均匀生长，并进一步磷化处理直接获得了无需黏合剂的Ce-CoFe-P@CC自支撑电极材料；通过XRD、SEM、TEM、N₂吸附-脱附等温曲线和XPS对电极材料进行表征，并对其进行了电催化OER性能测试。结果表明，合成得到的电极材料具有规则的纳米片形貌，纳米片长度和厚度分别为2.50 μm和0.05 μm；Ce和P的掺杂优化了CoFe-LDH电子结构，促进了电荷转移，增加了催化活性位点，提高了电极的耐久性；Ce-CoFe-P@CC在10 mA/cm²的电流密度下只需187 mV的过电势，表现出优异的OER催化性能。

关键词: 析氧反应, 电催化, CoFe层状双金属氢氧化物, 稀土金属, 磷化物

Abstract:

Powder electrocatalysts usually need adhesives for electrocatalytic performance testing,resulting in an increase in resistance,a decrease in catalyst load,and easy stripping of the catalyst under long-time testing.Ce-doped CoFe layered bimetallic hydroxides were uniformly grown on carbon cloth by one-step hydrothermal method,and the adhesive-free Ce-CoFe-P@CC self-supporting electrocatalyst was obtained by further phosphating treatment.It was characterized by XRD,SEM,TEM,N₂ adsorption-desorption isotherm and XPS,and its electrocatalytic OER performance was tested.The results show that the synthesized electrode material has regular thin nanosheet morphology,and the length and thickness of the nanoflake are 2.50 μm and 0.05 μm, respectively.The doping of Ce and P optimizes the electronic structure of CoFe-LDH,promotes the charge transfer,increases the catalytically active site,and improves the durability of the electrode.The Ce-CoFe-P@CC only needs an overpotential of 187 mV at a current density of 10 mA/cm²,showing excellent OER catalytic performance.

Key words: Oxygen evolution reaction, Electrocatalysis, CoFe layered bimetallic hydroxide, Rare earth metal, Phosphide

中图分类号:

TQ151

毕艳琴, 陈亮亮, 段春阳, 赵增华. Ce-CoFe-P@CC纳米复合催化体系的OER性能[J]. 石油化工高等学校学报, 2024, 37(3): 49-57.

Yanqin BI, Liangliang CHEN, Chunyang DUAN, Zenghua ZHAO. OER Performance of Ce-CoFe-P@CC Nanocomposite Catalytic System[J]. Journal of Petrochemical Universities, 2024, 37(3): 49-57.

图/表 10

图1 Ce-CoFe-P@CC纳米片的合成示意图

Fig.1 Schematic diagram of synthesis of Ce-CoFe-P@CC nanosheets

图2 Ce-CoFe和Ce-CoFe-P的XRD谱图

Fig.2 XRD diagram of Ce-CoFe and Ce-CoFe-P

图3 Ce-CoFe@CC和Ce-CoFe-P@CC的SEM图像

Fig.3 SEM images of Ce-CoFe @CC and Ce-CoFe-P@CC

图4 Ce-CoFe-P的TEM、HRTEM及元素分布图

Fig.4 Distribution diagram of TEM, HRTEM and elements of Ce-CoFe-P

图5 Ce-CoFe-P的N2吸附-脱附等温曲线及孔径分布图

Fig.5 N2 adsorption-desorption isotherm curve and pore size distribution of Ce-CoFe-P

图6 Ce-CoFe和CoFe的XPS谱图

Fig.6 XPS analysis of Ce-CoFe and CoFe

图7 Ce-CoFe-P和Ce-CoFe的XPS谱图

Fig.7 XPS contrast spectra of Ce-CoFe-P and Ce-CoFe

图8 不同催化剂的LSV极化曲线、相应的过电势及Tafel斜率（a） LSV极化曲线（b）过电势（c） Tafel斜率

Fig.8 LSV polarization curves of different catalysts and corresponding overpotential and Tafel slope

图9 不同催化剂的CV曲线、Cdl和EIS图

Fig.9 CV curves, Cdl and EIS diagrams of different catalysts

图10 Ce-CoFe-P@CC的稳定性测试结果

Fig.10 Stability test of Ce-CoFe-P@CC

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