IrO2改性钛网对固体聚合物电解质电解器集电极层电化学性能的影响

doi:10.7503/cjcu20150012

摘要/Abstract

摘要：

采用亚当斯熔融法(Adams fusion method)在钛网上包覆IrO₂催化剂, 并将其用作固体聚合物电解质(SPE)电解器的阳极集电极, 发现其可以显著降低电解过电位. 通过X射线多晶衍射(XRD)和透射电子显微镜(TEM)分析发现, 包裹在钛网上的IrO₂催化剂晶粒为2.0~3.0 nm, 结晶度良好; 交流阻抗谱(EIS)和循环伏安(CV)分析结果表明, 改性的钛网集电极层可增加三相反应活性点, 使三相反应通道由催化层延伸到集电极层, 活性催化剂表面积增大, 从而大幅度降低了活化阻抗, 电解性能获得提升. 通过对不同IrO₂催化剂负载量改性的钛网进行研究发现, 随着钛网负载IrO₂量的增加, 在相同电流密度下, 极化曲线的过电位先减小后增加, 当IrO₂负载量为1.38%(质量分数)时, 电解池的过电位最低, 在1 A/cm²电流密度下, 过电位为2.028 V.

关键词: 固体聚合物电解质电解器, 亚当斯熔融法, 阳极集电极, IrO2催化剂, 改性钛网

Abstract:

Modified Ti meshes used as anode collector layer of solid polymer electrolyte(SPE) electrolyzer were prepared through Adams fusion method. The Ti mesh modification synchronized with IrO₂ preparation. The physico-chemical properties of the modified Ti meshes and IrO₂ catalyst were studied by scanning electron microscopy(SEM), X-ray diffraction(XRD) and transmission electron microscopy(TEM). An IrO₂ layer was formed onto the Ti mesh’s surface and the size of anode catalyst IrO₂ was in nanoscale. The SPE electrolyzer employing modified Ti mesh showed a higher performance due to the extension of three-phase activity sites from catalyst layer to diffusion layer. 100 mesh Ti mesh showed lower R_ct and better catalyst loadings compared with 50 mesh one, and owned a good durability as well. Ti meshes with different catalyst loadings were tested and the Ti mesh with 1.38%(mass fraction) catalyst loading exhibited the best performance, which yielded a potential of 2.028 V at a current density of 1 A/cm².

Key words: Solid polymer electrolyte(SPE) electrolyzer, Adams fusion method, Anode collector, IrO2 catalyst, Modified Ti mesh

中图分类号:

O643

TrendMD:

宋宇琨, 吕洪, 郝传璞, 米灿根. IrO₂改性钛网对固体聚合物电解质电解器集电极层电化学性能的影响. 高等学校化学学报, 2015, 36(7): 1378.

SONG Yukun, LÜ Hong, HAO Chuanpu, MI Cangen. Effect of IrO₂ Modification of Ti Mesh on Electrochemical Performance of Collector Layer for Solid Polymer Electrolyte Electrolyzer^†. Chem. J. Chinese Universities, 2015, 36(7): 1378.

图/表 16

Table 1 Modified Ti mesh specimens

Ti mesh	Mass before modification/mg	Mass after modification/mg	IrO₂ loading/mg	IrO₂ loading ratio(%)
50 mesh Adams	80.53	81.92	1.39	1.70
100 mesh Adams-1	45.98	46.19	0.21	0.45
100 mesh Adams-2	48.71	49.39	0.68	1.38
100 mesh Adams-3	47.34	48.63	1.29	2.65

Fig.1 SPE electrolytic cell assembly diagram

Fig.2 SEM images of Ti meshes before(A, B) and after(C, D) modification at low(A, C) and high(B, D) magnifications(A), (B) 50 mesh Ti mesh; (C), (D) 50 mesh Adams.

Fig.3 XRD pattern of IrO2 prepared by Adams fusion method

Fig.4 TEM images of IrO2 prepared by Adams fusion method at low(A) and high(B) magnifications

Fig.5 Polarization curves of water electrolyzers employing different anode electrode collector layersa. 50 mesh non-modified; b. 50 mesh Adams; c. 100 mesh Adams-2.

Fig.6 EIS of water electrolyzers employing diffe-rent anode electrode collector layers at 0.05 A/cm2a. 50 mesh non-modified; b. 50 mesh Adams; c. 100 mesh Adams-2.

Fig.7 Repetitive cyclic voltammetry of water electrolyzers employing different anode electrode collector layersa. 50 mesh non-modified; b. 50 mesh Adams; c. 100 mesh Adams-2.

Table 2 Rct and RΩ of water electrolyzers employing different anode electrode collector layers

Ti mesh	R_Ω/Ω	R_ct/Ω
50 mesh non-modified	0.195	0.272
50 mesh Adams	0.129	0.105
100 mesh Adams-2	0.186	0.102

Fig.8 SEM images of 100 mesh modified Ti meshes(100 mesh Adams-2) at low(A) and high(B) magnifications

Table 3 Rct and RΩ of water electrolyzers employing modified Ti meshes with different IrO2 loadings

Ti mesh	R_Ω/Ω	R_ct/Ω
100 mesh Adams-1	0.217	0.110
100 mesh Adams-2	0.186	0.102
100 mesh Adams-3	0.211	0.098

Fig.9 Polarization curves of water electrolyzers employing modified Ti meshes with diffe-rent IrO2 loadingsw(IrO2): a. 0.45%(100 mesh Adams-1); b. 1.38%(100 mesh Adams-2); c. 2.65%(100 mesh Adams-3).

Fig.10 EIS of water electrolyzers employing modified Ti meshes with different IrO2 loadings at 0.05 A/cm2w(IrO2): a. 0.45%(100 mesh Adams-1); b. 1.38%(100 mesh Adams-2); c. 2.65%(100 mesh Adams-3).

Fig.11 Repetitive cyclic voltammetry of water electrolyzers employing modified Ti meshes with different catalyst loadingsw(IrO2): a. 1.38%(100 mesh Adams-2); b. 0.45%(100 mesh Adams-1); c. 2.65%(100 mesh Adams-3).

Fig.12 SEM images of 100 mesh Ti meshes with different IrO2 loadingsw(IrO2): a. 0.45%(100 mesh Adams-1); b. 1.38%(100 mesh Adams-2); c. 2.65%(100 mesh Adams-3).

Fig.13 Durability test of modified Ti mesh

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IrO₂改性钛网对固体聚合物电解质电解器集电极层电化学性能的影响

Effect of IrO₂ Modification of Ti Mesh on Electrochemical Performance of Collector Layer for Solid Polymer Electrolyte Electrolyzer^†

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