J. Mater. Sci. Technol. ›› 2024, Vol. 197: 102-115.DOI: 10.1016/j.jmst.2024.01.043

Special Issue: Catalytic materials 2024 Composites 2024 Nano materials 2024

• Research Article • Previous Articles     Next Articles

Tunable decoration of Ni/Ni3N nano-heterostructures on N-defective g-C3N4 via topochemical self-nitridation for efficient electrocatalytic overall water splitting

Changcun Tang, Jiahui Liao, Yanzhe Sheng, Yanhe Xiao, Baochang Cheng, Shuijin Lei*   

  1. School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
  • Received:2023-10-15 Revised:2023-12-08 Accepted:2024-01-16 Published:2024-10-20 Online:2024-10-15
  • Contact: *E-mail address: shjlei@ncu.edu.cn (S. Lei)

Abstract: The growth of base-metal-based heterostructures on metal-free carriers is considered an effective strategy for designing low-cost high-efficiency hybrid electrocatalysts with electronic modulation for bifunctional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), as well as further overall water splitting (OWS). Herein, Ni/Ni3N heterostructures with regulable composition are grown in-situ on N-defective graphitic carbon nitride (g-C3N4) through a novel ammonia-free topochemical self-nitridation route. Benefitting from the synergetic effect between Ni/Ni3N heterointerface and the strong support of g-C3N4 carrier, the as-fabricated Ni/Ni3N/g-C3N4 composite performs superior capacity toward both HER and OER in alkaline conditions. The optimal Ni/Ni3N/g-C3N4 sample requires low overpotentials for HER (55 mV) and OER (253 mV) to drive a current density of 10 mA cm-2, along with long-term durability. Furthermore, the constructed Ni/Ni3N/g-C3N4 (+||-) electrolytic cell for alkaline OWS can afford a current density of 10 mA cm-2 under a voltage of 1.556 V with outstanding stability.

Key words: Heterostructure, Synergetic effect, Self-nitridation, Electrocatalysis, Water splitting