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Liang Y, Zhao X, Yan P, Xue L, Li H, Gu L, Long Y, Yu T, Yang Y. Crystalline Ni 5P 4/amorphous CePO 4 core/shell heterostructure arrays for highly-efficient electrocatalytic overall water splitting. J Colloid Interface Sci 2024; 655:565-575. [PMID: 37952460 DOI: 10.1016/j.jcis.2023.11.037] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 11/03/2023] [Accepted: 11/06/2023] [Indexed: 11/14/2023]
Abstract
Exploring low-cost and highly efficient bifunctional electrocatalysts for overall water splitting has become a research focus recently. Crystalline/amorphous core/shell heterostructures have great potential for applications in the field of electrocatalytic overall water splitting. However, related research is still challenging. Herein, crystalline Ni5P4 nanosheets/amorphous CePO4 nanocrystals core/shell heterostructure arrays were developed for electrocatalytic overall water splitting. It is shown that the heterostructure array required competitive HER and OER overpotentials of 94 and 191 mV in alkaline environment (10 mA/cm2), respectively. Encouragingly, the symmetrical two-electrode system constructed with the heterostructure array only required an ultra-low cell voltage of 1.535 V to achieve a current density of 10 mA/cm2. This indicates the system has huge potential in overall water splitting. The electrocatalytic mechanism was studied systematically by combining theoretical calculation and experimental characterization. It was found that the surface coating of amorphous CePO4 could not only significantly increase the electrochemical active surface area and improve the charge transfer of crystalline Ni5P4 nanosheets, but could also regulate d-band center of Ni5P4 and optimize the adsorption towards reaction intermediates in water splitting. The results not only provide an excellent crystalline/amorphous core/shell heterostructure bifunctional electrocatalyst for overall water splitting but also greatly expand the application of rare earth metal phosphate CePO4.
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Affiliation(s)
- Yan Liang
- Department of Artificial Intelligence, Nanchang Key Laboratory of New Electronic Components and Sensing Technology, Jiangxi University of Technology, Nanchang 330098, Jiangxi, PR China
| | - Xiaojian Zhao
- Department of Artificial Intelligence, Nanchang Key Laboratory of New Electronic Components and Sensing Technology, Jiangxi University of Technology, Nanchang 330098, Jiangxi, PR China
| | - Peipei Yan
- Department of Artificial Intelligence, Nanchang Key Laboratory of New Electronic Components and Sensing Technology, Jiangxi University of Technology, Nanchang 330098, Jiangxi, PR China
| | - Li Xue
- Department of Artificial Intelligence, Nanchang Key Laboratory of New Electronic Components and Sensing Technology, Jiangxi University of Technology, Nanchang 330098, Jiangxi, PR China
| | - Hongying Li
- Department of Artificial Intelligence, Nanchang Key Laboratory of New Electronic Components and Sensing Technology, Jiangxi University of Technology, Nanchang 330098, Jiangxi, PR China
| | - Lisheng Gu
- Department of Artificial Intelligence, Nanchang Key Laboratory of New Electronic Components and Sensing Technology, Jiangxi University of Technology, Nanchang 330098, Jiangxi, PR China
| | - Yongdong Long
- Department of Artificial Intelligence, Nanchang Key Laboratory of New Electronic Components and Sensing Technology, Jiangxi University of Technology, Nanchang 330098, Jiangxi, PR China
| | - Ting Yu
- Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, PR China
| | - Yong Yang
- Jiangxi Key Laboratory of Nanomaterials and Sensors, Jiangxi Key Laboratory of Photoelectronics and Telecommunication, School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, PR China.
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