Citation: Ke Sun, Yongqing Zhao, Jie Yin, Jing Jin, Hanwen Liu, Pinxian Xi. Surface Modification of NiCo₂O₄ Nanowires using Organic Ligands for Overall Water Splitting[J]. Acta Physico-Chimica Sinica, ;2022, 38(6): 210700. doi: 10.3866/PKU.WHXB202107005 shu

Surface Modification of NiCo₂O₄ Nanowires using Organic Ligands for Overall Water Splitting

State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China

Corresponding author: Pinxian Xi, xipx@lzu.edu.cn
Received Date: 2 July 2021
Revised Date: 8 August 2021
Accepted Date: 13 August 2021
Available Online: 30 August 2021
Fund Project: the National Natural Science Foundation of China 21931001the National Natural Science Foundation of China 21922105the National Natural Science Foundation of China 51771085the National Natural Science Foundation of China 51801088the Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province 2019ZX-04the 111 Project B20027the Fundamental Research Funds for the Central Universities lzujbky-2021-pd04the Fundamental Research Funds for the Central Universities lzujbky-2021-sp41the Fundamental Research Funds for the Central Universities lzujbky-2021-it12the Fundamental Research Funds for the Central Universities lzujbky-2021-37the China Postdoctoral Science Foundation 2021M691375the China National Postdoctoral Program for Innovative Talents BX20200157

Bifunctional electrocatalysts in alkaline media play an important role in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), owing to the considerable influence of water splitting in the green energy sector. Herein, we present surface-modified NiCo₂O₄ nanowires (NWs) with rich defects as a highly efficient overall water splitting electrocatalyst in alkaline media, where the surface modification is accomplished using organic ligands. X-ray photoelectron spectroscopy reveals that the increase in the Co²⁺/Co³⁺ ratio is responsible for the excellent bifunctional electrocatalytic performance of the surface-modified NiCo₂O₄ NWs. As expected, benefiting from the organic ligand-dominated surface modification, the optimized NiCo₂O₄ NWs can display an overpotential of only 83 mV for the HER and 280 mV for the OER, with a current density of 10 mA·cm^-2 in 1.0 mol·L^-1 KOH solution. More importantly, the NiCo₂O₄ NWs surface-modified using organic ligands exhibit outstanding performance for overall water splitting, with a voltage of 2.1 V and current density of 100 mA·cm^-2, and also maintain their activity for at least 15 h. The present work highlights the importance of increasing the content of Co²⁺ in the spinel structure of NiCo₂O₄ NWs for enhancing their performance in overall water splitting.
- Bifunctional electrocatalyst,
- Organic ligand,
- Interface,
- Surface modified nanowire,
- Water splitting
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Surface Modification of NiCo₂O₄ Nanowires using Organic Ligands for Overall Water Splitting