催化学报 ›› 2023, Vol. 47: 93-120.DOI: 10.1016/S1872-2067(23)64396-7
刘丹卿a, 张丙兴a, 赵国强a, 陈建b, 潘洪革a,b, 孙文平a,c,*()
收稿日期:
2022-11-26
接受日期:
2023-01-10
出版日期:
2023-04-18
发布日期:
2023-03-20
通讯作者:
*电子信箱: wenpingsun@zju.edu.cn (孙文平).
基金资助:
Dan-Qing Liua, Bingxing Zhanga, Guoqiang Zhaoa, Jian Chenb, Hongge Pana,b, Wenping Suna,c,*()
Received:
2022-11-26
Accepted:
2023-01-10
Online:
2023-04-18
Published:
2023-03-20
Contact:
*E-mail: wenpingsun@zju.edu.cn (W. Sun).
About author:
Wenping Sun is a professor at School of Materials Science and Engineering, Zhejiang University. He received his B.S. degree in 2008 and Ph.D. degree in 2013 in Materials Science from the University of Science and Technology of China (USTC). His research expertise includes electrocatalysis, fuel cells, and batteries, especially the design of novel materials and structures, and fundamental understandings of related electrochemical processes.
Supported by:
摘要:
在电化学界面, 电催化过程通常包括电子转移、吸附和脱附、静电相互作用、溶剂化及去溶剂化等多步过程, 深入理解电催化反应机理极具挑战性. 对纳米结构电化学界面(电极)处电催化过程的深入理解十分有助于阐明电催化反应机理和设计高性能电催化剂材料. 电催化活性通常与电催化剂表面局域化的活性位点密切有关. 在反应条件下, 电催化反应过程的研究极大依赖于高分辨表征技术. 经典的宏观电化学表征方法仅可以提供不同界面位点的平均信息, 很难分辨一些特殊结构位点(如缺陷、晶界、边缘位点)的相关重要电化学信息. 原位电化学扫描探针显微镜技术, 包括电化学扫描隧道显微镜(EC-STM)、电化学原子力显微镜(EC-AFM)、扫描电化学显微镜(SECM)及扫描电化学池显微镜(SECCM), 能够在纳米及原子尺度研究电催化反应过程, 弥补了宏观表征方法的不足, 为探究构效关系和解析电催化反应机理提供了机遇.
本文介绍了各种扫描显微技术的基本原理、特点及优劣势, 并且概述了各项技术在电催化领域研究的重大进展. EC-STM和EC-AFM能够原位表征电催化过程中的纳米尺度表面结构演变及吸附/脱附过程, 但无法直接测量局部电化学活性(法拉第电流). 通过SECM和SECCM可以检测微区电化学信号, 并获得电化学通量和电化学反应动力学信息, 可作为EC-STM和EC-AFM的补充技术. 结合二者的优势, 进一步介绍了双探针结合技术(SECM-AFM, SECM-STM, SECM-SICM及SECM-SECCM)的原理和关键电催化应用. 随后, 从揭示构效关系、结构演变/稳定性、反应物或中间物的吸附、反应路径和选择性等角度, 总结了这些原位电化学扫描探针显微镜技术在电催化领域(析氢反应、氢氧化反应、析氧反应、氧还原反应及CO2还原反应)的最新研究进展. 最后, 对原位电化学扫描探针显微镜技术在电催化领域研究的挑战及未来发展进行了展望.
刘丹卿, 张丙兴, 赵国强, 陈建, 潘洪革, 孙文平. 原位电化学扫描探针显微镜技术在电催化领域的应用进展[J]. 催化学报, 2023, 47: 93-120.
Dan-Qing Liu, Bingxing Zhang, Guoqiang Zhao, Jian Chen, Hongge Pan, Wenping Sun. Advanced in-situ electrochemical scanning probe microscopies in electrocatalysis[J]. Chinese Journal of Catalysis, 2023, 47: 93-120.
Name | Detected signal | Advantages | Disadvantages | Scope of applications | Ref. |
---|---|---|---|---|---|
EC-STM | tunneling current, surface current | atomic resolution | disruptive faradic current at the tip; tip potential region limited to electrolyte stability window or the stability of the tip material | nanoscale characterization of electrocatalytic processes associated with reactants adsorption/desorption and surface transformation under electrochemical reactions | [ |
EC-AFM | physical force, surface current | a wide range of materials including semiconductor and soft electrode materials | lower lateral resolution (typically 1‒20 nm) compared with EC-STM | morphological and mechanical changes in the interface between electrolyte and electrode with nanoscale resolution | [ |
SECM | Faradic current | electrochemical images at the nanoscale | electrochemical activity and topography are not easily separated, diffusional broadening effect | extracting kinetics information quantitatively, resolving electrochemical activity over nanoscale systems | [ |
SECCM | ion current, surface current | the electrochemical properties of a surface are probed directly locally with integrated positional feedback, high mass transfer rates | resolution is limited by tip size | combined with other structural characterizing techniques, enabling high resolution correlative structure-activity investigations | [ |
SECM-AFM | physical force, faradic current | simultaneously acquiring topography, mechanical, electrical, and electrochemical map | difficulties in dual probe fabrication and theoretical consideration | imaging composite surfaces exhibiting electrochemical active sites in materials, biological and chemical sciences | [ |
SECM-STM | tunneling current, faradic current | separating topographical effects from surface electrochemical information | difficulties in elucidating precise geometry of the nanoelectrode, lack of electrochemical map with high resolution | resolving local electrochemistry at conducting surfaces | [ |
SECM-SICM | ion current, faradic current | allowing for simultaneous topography and electrochemical map, generally noncontact topography and can be applied in biological materials | its resolution is usually lower than that of SECM-AFM | generating submicrometer resolution images based on topography, electrochemical and bioelectrochemical signals for local electrochemistry measurement, local pH measurement, as well as detections of enzymatic activity, cellular activity and cell membrane permeability | [ |
SECM-SECCM | ion current, faradic current | enabling high resolution electrochemical imaging with integrated positional feedback | spatial resolution is defined by the meniscus contact area, which is limited by tip size | enabling electrochemical measurements in non-aqueous environments and transient current measurements on insulating and reactive surfaces | [ |
Table 1 Comparison of in-situ EC-SPMs for electrocatalysis.
Name | Detected signal | Advantages | Disadvantages | Scope of applications | Ref. |
---|---|---|---|---|---|
EC-STM | tunneling current, surface current | atomic resolution | disruptive faradic current at the tip; tip potential region limited to electrolyte stability window or the stability of the tip material | nanoscale characterization of electrocatalytic processes associated with reactants adsorption/desorption and surface transformation under electrochemical reactions | [ |
EC-AFM | physical force, surface current | a wide range of materials including semiconductor and soft electrode materials | lower lateral resolution (typically 1‒20 nm) compared with EC-STM | morphological and mechanical changes in the interface between electrolyte and electrode with nanoscale resolution | [ |
SECM | Faradic current | electrochemical images at the nanoscale | electrochemical activity and topography are not easily separated, diffusional broadening effect | extracting kinetics information quantitatively, resolving electrochemical activity over nanoscale systems | [ |
SECCM | ion current, surface current | the electrochemical properties of a surface are probed directly locally with integrated positional feedback, high mass transfer rates | resolution is limited by tip size | combined with other structural characterizing techniques, enabling high resolution correlative structure-activity investigations | [ |
SECM-AFM | physical force, faradic current | simultaneously acquiring topography, mechanical, electrical, and electrochemical map | difficulties in dual probe fabrication and theoretical consideration | imaging composite surfaces exhibiting electrochemical active sites in materials, biological and chemical sciences | [ |
SECM-STM | tunneling current, faradic current | separating topographical effects from surface electrochemical information | difficulties in elucidating precise geometry of the nanoelectrode, lack of electrochemical map with high resolution | resolving local electrochemistry at conducting surfaces | [ |
SECM-SICM | ion current, faradic current | allowing for simultaneous topography and electrochemical map, generally noncontact topography and can be applied in biological materials | its resolution is usually lower than that of SECM-AFM | generating submicrometer resolution images based on topography, electrochemical and bioelectrochemical signals for local electrochemistry measurement, local pH measurement, as well as detections of enzymatic activity, cellular activity and cell membrane permeability | [ |
SECM-SECCM | ion current, faradic current | enabling high resolution electrochemical imaging with integrated positional feedback | spatial resolution is defined by the meniscus contact area, which is limited by tip size | enabling electrochemical measurements in non-aqueous environments and transient current measurements on insulating and reactive surfaces | [ |
Fig. 4. Schematic of SECM scanning modes. (a?c) Feedback mode. (d) Tip generation/substrate collection mode. (e) Substrate generation/tip collection mode. (f) Redox competitive mode.
Fig. 6. EC-STM revealing catalytic activity with high resolution under HER conditions. (a?c) A scheme illustrating the STM tip is over the terrace (a) or over the step (b). The tunneling-current noise is likely increased when the tip is over a step edge. (c) STM line scans (constant-current mode) over Pt(111) surface in 0.1 mol L?1 HClO4 under different potentials to drive HER. (d?f) STM characterization of Pd islands on an Au(111) substrate under HER conditions. (d) STM image in air. (e) STM image in 0.1 mol L?1 sulfuric acid (constant-height mode). The inset indicates an atomically resolved image of the Au(111) substrate. (f) Line scans obtained from the experiment in Fig. 6(e). Reprinted with permission from Ref. [21]. Copyright 2017, Springer Nature.
Fig. 7. High-resolution SECM characterization of mixed-phase MoS2 under HER conditions. Feedback mode image of the sample on ITO substrate obtained with Fc redox mediator (a) and its corresponding 2D current map (b). (c) SECM image of a zoom-in area. (d) Line scans of HER activity using SG/TC mode across the same area in (c). Reprinted with permission from Ref. [209]. Copyright 2019, The Royal Society of Chemistry.
Fig. 8. SECCM mapping of HER activities on MoS2 and MoS2-WS2 heterostructure. (a) Illustration of SECCM HER measurement over MoS2 surface in 0.5 mol L?1 H2SO4. Pd-H2 was used as a quasi-reference electrode. (b) SECCM current image of 1H MoS2 nanosheets on HOPG substrate. Scan size was 15 × 15 μm2, scan rate was 130 V s?1. Applied voltage was ?1.3 V vs. RHE. Overpotential (c) and Tafel slope plot (d) of the 1H MoS2 edge (red line), terrace (green line), and HOPG edge (gray line). High-resolution SECCM current image of MoS2-WS2 heterostructure at a potential of ?1.1 V vs. RHE (e) and its illustration (f). Scan size was 5 × 5 μm2. Reproduced with permission from Ref. [213]. Copyright 2020, John Wiley and Sons.
Fig. 9. Nanoscale active sites on low carbon steel for HER revealed by SECCM. (a) EBSD map of an SECCM scanned area of the low carbon steel surface. (b) SECCM isurf map of the corresponding area shown in a. Scan area was 40 × 40 μm2. (c) Histogram of the averaged isurf measured from 7.2 to 9.8 ms from each probe landing on low index grains that have a crystal orientation within 10° of (100), (101) and (111). (d) EBSD map of one area showing a HER active grain boundary and the misorientations of the two grains were labeled. (e) The corresponding SECCM map of the averaged current from 7.2 to 9.8 ms during a pulse at a potential of ?1.337 V vs. Ag/AgCl. (f) Enhanced HER activity on local MnS inclusions. (i) SEM, (ii) EDS Sulfur map and (iii) SECCM current map. Reproduced with permission from Ref. [211]. Copyright 2019, American Chemical Society.
Fig. 10. EC-STM study of cobalt porphyrin catalyzed OER activity. Low magnification (a) and higher magnification (b) STM images of CoTPP adlayer on Au(111) substrate in 1 mol L?1 HClO4. STM measurements of CoTPP adlayer on Au(111) in 0.1 mol L?1 KOH (c) and 0.1 mol L?1 NaClO4 (d). (e) Cross section profiles along the white lines in b to d (from top to bottom). (f) Structure model for the CoTPP adlayer. (g) UV-vis spectra of CoTPP adlayer in DFM/H2O solution with KOH, NaClO4 and HClO4 electrolyte; STM images of CoTPP adlayer on Au(111) in 0.1 mol L?1 KOH at a potential of 1.30 V vs. Pt (Ebias = ?200.0 mV, It = 3.5 nA) (h) and 1.80 V vs. Pt (Ebias = ?685.0 mV, It = 3.5 nA) (i). (j,k) Cross section profiles along the white line in (h) and (i). Reproduced with permission from Ref. [75]. Copyright 2019, American Chemical Society.
Fig. 11. Correlative operando microscopy of OER electrocatalyst. (a) SECCM current density line scans of OER activity over β-Co(OH)2 particles as shown in the corresponding SEM images using scanning constant height mode (constant lateral scanning rate: 30 nm s?1). The scan direction is indicated by dotted yellow arrows. Scale bars, 1 μm. (b) Topography graph and local current density maps at increasing applied potential using hopping scanning mode (scan rate: 1 V s?1). Scale bar, 5 μm. (c) Differential height operando EC-AFM maps at different applied voltages compared to the particle morphology at 0.96 V (open circuit-voltage). Scale bar, 500 nm. (d) Line scan of change in particle height as a function of voltage over β-Co(OH)2 particle. (e) EC-AFM current (indicated by red line) and EQCM isothermal (T = 25 °C) mass change with increasing voltage (indicated by blue line). Scan rate of EC-AFM and EQCM, 5 mV min?1. (f) Operando STXM line scan of Co oxidation state at different applied voltage. (g) OER Tafel slope obtained from the STXM cell versus that taken in a macroscopic RDE cell at a scan rate of 10 mV s?1. Reproduced with permission from Ref. [130]. Copyright 2021, Springer Nature.
Fig. 12. Visualizing ORR electrocatalytic performance on individual carbon nanotubes. (a) Illustration of SECCM setup of a nanopipette scanning over an individual SWNT, where dmeniscus and dSWNT correspond to meniscus and SWNT diameter, respectively. (b) ORR activity at a pristine SWNT studied by cyclic voltammograms. Scan rate: 100 mV s?1. (c) SECCM current map of a pristine SWNT. Inset demonstrates a line scan profile of ORR current across the SWNT. (d) SECCM current map of a pristine SWNT containing a kinked region. (e) Zoom-in map of D. The corresponding line scan profiles of a kinked region (red dashed line in (e)) and a selected pristine site (black dashed line in (e)). SECCM maps and line scans of a pristine SWNT before (f) and after (g) electrochemical oxidation. Scan rate: 50 mV s?1. SECCM maps of (c), (d), (e) and (f), (g) obtained at ?1.0 and ?0.75 V vs. Ag/AgCl QRCE, respectively. All measurements performed in aerated PBS (pH 7.2) with 25 mmol L?1 KCl. Reproduced with permission from Ref. [264]. Copyright 2014, American Chemical Society.
Fig. 13. Microstructure dependence investigations of HER and CO2RR activities. (a) EBSD map along the z direction. The white box indicates the SECCM scanning area in Ar atmosphere. (b) SEM image of the scanned SECCM region. (c) SECCM current density map at ?1.05 V vs. Ag/AgCl QRCE. (d) Histogram of current densities from the SECCM scanned area. The scale bars in (b) and (c) are 5 μm. Microstructure dependence investigation of CO2 electroreduction activity. (e) EBSD map of sample A along the z direction. The white box indicates the SECCM scanning area in CO2 atmosphere. (f) SEM image of the SECCM scanned area. (g) SECCM map at ?1.05 V vs. Ag/AgCl. Scale bars in f and g are 5 μm. (h) Histogram of current densities from all the pixels marked in (f). (i) EBSD map of a highly deformed region in sample B along the z direction. (j) The corresponding SECCM map at ?1.05 V vs. Ag/AgCl. Scale bars in (i) and (j) are 5 μm. Reproduced with permission from Ref. [123]. Copyright 2021 Springer Nature.
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