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Yijin Wu, Jian Yang, Tengxiu Tu, Wei‐Qiong Li, Pengfang Zhang, Yao Zhou, Jian‐feng Li, Jian‐feng Li, Jun‐Tao Li, Jun‐Tao Li, Shi‐Gang Sun
Defects have been found to enhance the electrocatalytic performance of NiFe‐LDH for oxygen evolution reaction (OER). Nevertheless, their specific configuration and the role played in regulating the surface reconstruction of electrocatalysts remain ambiguous. Herein, cationic vacancy defects are generated via aprotic‐solvent‐solvation‐induced leaking of metal cations from NiFe‐LDH nanosheets. DFT calculation and in situ Raman spectroscopic observation both reveal that the as‐generated cationic vacancy defects tend to exist as VM (M=Ni/Fe); under increasing applied voltage, they tend to assume the configuration VMOH, and eventually transform into VMOH‐H which is the most active yet most difficult to form thermodynamically. Meanwhile, with increasing voltage the surface crystalline Ni(OH)x in the NiFe‐LDH is gradually converted into disordered status; under sufficiently high voltage when oxygen bubbles start to evolve, local NiOOH species become appearing, which is the residual product from the formation of vacancy VMOH‐H. Thus, we demonstrate that the cationic defects evolve along with increasing applied voltage (VM → VMOH → VMOH‐H), and reveal the essential motif for the surface restructuration process of NiFe‐LDH (crystalline Ni(OH)x → disordered Ni(OH)x → NiOOH). Our work provides insight into defect‐induced surface restructuration behaviors of NiFe‐LDH as a typical precatalyst for efficient OER electrocatalysis.
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Wu, Y., Yang, J., Tu, T., Li, W., Zhang, P., Zhou, Y., Li, J., Li, J., Li, J., Li, J., & Sun, S. (2021). Evolution of Cationic Vacancy Defects: A Motif for Surface Restructuration of OER Precatalyst. Angewandte Chemie International Edition, 60(51), 26829–26836. https://doi.org/10.1002/anie.202112447
Wu, Yijin, et al. "Evolution of Cationic Vacancy Defects: A Motif for Surface Restructuration of OER Precatalyst." Angewandte Chemie International Edition, vol. 60, no. 51, 2021, pp. 26829–26836, https://doi.org/10.1002/anie.202112447.
Wu, Yijin, Jian Yang, Tengxiu Tu, Wei‐Qiong Li, Pengfang Zhang, Yao Zhou, Jian‐feng Li, et al. "Evolution of Cationic Vacancy Defects: A Motif for Surface Restructuration of OER Precatalyst." Angewandte Chemie International Edition 60, no. 51 (2021): 26829–26836. https://doi.org/10.1002/anie.202112447.
Wu Y., Yang J., Tu T. [и др.] Evolution of Cationic Vacancy Defects: A Motif for Surface Restructuration of OER Precatalyst // Angewandte Chemie International Edition. — 2021. — Vol. 60, № 51. — P. 26829–26836. — URL: https://doi.org/10.1002/anie.202112447
@article{wu2021evolution,
title = {{Evolution of Cationic Vacancy Defects: A Motif for Surface Restructuration of OER Precatalyst}},
author = {Yijin Wu and Jian Yang and Tengxiu Tu and Wei‐Qiong Li and Pengfang Zhang and Yao Zhou and Jian‐feng Li and Jian‐feng Li and Jun‐Tao Li and Jun‐Tao Li and Shi‐Gang Sun},
journal = {Angewandte Chemie International Edition},
year = {2021},
volume = {60},
number = {51},
pages = {26829--26836},
doi = {10.1002/anie.202112447},
url = {https://doi.org/10.1002/anie.202112447}
}TY - JOUR AU - Wu, Yijin AU - Yang, Jian AU - Tu, Tengxiu AU - Li, Wei‐Qiong AU - Zhang, Pengfang AU - Zhou, Yao AU - Li, Jian‐feng AU - Li, Jian‐feng AU - Li, Jun‐Tao AU - Li, Jun‐Tao AU - Sun, Shi‐Gang TI - Evolution of Cationic Vacancy Defects: A Motif for Surface Restructuration of OER Precatalyst JO - Angewandte Chemie International Edition VL - 60 IS - 51 SP - 26829 EP - 26836 PY - 2021 DA - 2021/10/20 DO - 10.1002/anie.202112447 UR - https://doi.org/10.1002/anie.202112447 ER -
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