In‐Plane Heterostructured MoN/MoC Nanosheets with Enhanced Interfacial Charge Transfer for Superior Pseudocapacitive Storage

Author:

Wang Cheng12,Li Xiuli2,Song Hao2ORCID,Chu Paul K3ORCID,Huo Kaifu14ORCID

Affiliation:

1. Wuhan National Laboratory for Optoelectronics (WNLO) Huazhong University of Science and Technology Wuhan 430074 China

2. The State Key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and Nanotechnology Wuhan University of Science and Technology Wuhan 430081 China

3. Department of Physics Department of Materials Science and Engineering and Department of Biomedical Engineering City University of Hong Kong Tat Chee Avenue Hong Kong Kowloon 999077 China

4. Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518063 China

Abstract

Abstract2D transition metal carbide/nitride heterostructures are emerging pseudocapacitive materials for supercapacitors (SCs); however, the lack of efficient synthesis methods and an in‐depth understanding of the pseudocapacitive storage mechanism of these potentially important materials impede their applications in SCs. Herein, 2D MoN/MoC nanosheets with a precisely regulated interface are prepared controllably by a scalable salt‐assisted method with bulk MoS2 as the precursor. In operando infrared spectroscopy and electrochemical quartz crystal microbalance results reveal that the pseudocapacitance of the MoN/MoC nanosheets originates from the reversible reaction between Mo–N sites and H+ in the acidic electrolyte. Density‐functional theory calculations and X‐ray photoelectron spectroscopy disclose that the MoC/MoN heterointerface induces the internal electric field from the accumulated negative charges at the Mo–N sites by electron donation from MoC, leading to enhanced H+ adsorption at the Mo–N sites and superior pseudocapacitive storage. The heterostructured MoN/MoC nanosheets show a large volumetric capacity of 1045.3 F cm−3 at 1 A cm−3, high‐rate capability of 702.8 F cm−3 at 10 A cm−3, and superior cyclability with capacity retention of 98% after 10,000 cycles, which outperform reported Mo‐based carbides and nitrides. The results provide new insights into the development of high‐performance 2D heterostructured materials for superior pseudocapacitive storage.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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