Construction of CoP/Co2P Coexisting Bifunctional Self-Supporting Electrocatalysts for High-Efficiency Oxygen Evolution and Hydrogen Evolution

Zhang, Linyi; Chen, Yu; Liu, Guangsheng; Li, Zhen; Liu, Song; Tiwari, Santosh K.; Ola, Oluwafunmilola; Pang, Bingyan; Wang, Nannan; Zhu, Yanqiu

Abstract

Development of a low cost, high activity, and stable nonprecious metal bifunctional catalyst for electrocatalytic water cracking is a hot topic and big challenge. In this paper, we prepared a nitrogen-doped carbon nanotube (NCNT)-enhanced three-dimensional self-supported electrocatalyst with CoP and Co2P coexistence by a two-step strategy of high-temperature carbonization and low-temperature phosphorylation. Furthermore, the induced three-dimensional carbon network skeleton facilitates rapid charge transfer. In addition, the active sites of the carbon foam (CF) are greatly increased by the construction of hollow structures. As a bifunctional electrocatalyst, CoP/Co2P/NCNT@CF exhibited excellent catalytic activity for both hydrogen evolution reaction and oxygen evolution reaction in alkaline media, requiring low overpotentials of 133 and 289 mV to obtain a current density of 10 mA cm-2, respectively. Additionally, the synthesized catalysts also exhibit good long-term stability, maintaining high catalytic activity after 20 h of continuous operation. We also confirmed the main driving force to improve the electron transfer between the heterostructures of Co and P by XPS spectra. The excellent electrocatalytic performance can be attributed to the close synergy between the highly active CoP/Co2P/NCNT and CF. This study provides a new strategy for the design of highly active bifunctional self-supporting electrocatalysts.

Citation

Zhang, L., Chen, Y., Liu, G., Li, Z., Liu, S., Tiwari, S. K., …Zhu, Y. (2022). Construction of CoP/Co2P Coexisting Bifunctional Self-Supporting Electrocatalysts for High-Efficiency Oxygen Evolution and Hydrogen Evolution. ACS Omega, 7(15), 12846-12855. https://doi.org/10.1021/acsomega.2c00123

• Journal Article Type: Article
• Acceptance Date: Mar 28, 2022
• Online Publication Date: Apr 4, 2022
• Publication Date: Apr 19, 2022
• Deposit Date: May 3, 2022
• Publicly Available Date: May 3, 2022
• Journal: ACS Omega
• Electronic ISSN: 2470-1343
• Publisher: American Chemical Society (ACS)
• Peer Reviewed: Peer Reviewed
• Volume: 7
• Issue: 15
• Pages: 12846-12855
• DOI: https://doi.org/10.1021/acsomega.2c00123
• Keywords: General Chemical Engineering; General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/7950286
• Publisher URL: https://pubs.acs.org/doi/10.1021/acsomega.2c00123