Tunable decoration of Ni/Ni_(3)N nano-heterostructures on N-defective g-C_(3)N_(4)via topochemical self-nitridation for efficient electrocatalytic overall water splitting  

作　　者：Changcun Tang Jiahui Liao Yanzhe Sheng Yanhe Xiao Baochang Cheng Shuijin Lei 

机构地区：[1]School of Physics and Materials Science,Nanchang University,Nanchang 330031,China

出　　处：《Journal of Materials Science & Technology》2024年第30期102-115,共14页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22265018 and 21961019);the Key Project of Natural Science Foundation of Jiangxi Province(Grant Nos.20232ACB204010).

摘　　要：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/Ni_(3)N heterostructures with regulable composition are grown in-situ on N-defective graphitic carbon nitride(g-C_(3)N_(4))through a novel ammonia-free topochemical self-nitridation route.Benefitting from the synergetic effect between Ni/Ni_(3)N heterointerface and the strong support of g-C_(3)N_(4)carrier,the as-fabricated Ni/Ni_(3)N/g-C_(3)N_(4)composite performs superior capacity toward both HER and OER in alkaline conditions.The optimal Ni/Ni_(3)N/g-C_(3)N_(4)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/Ni_(3)N/g-C_(3)N_(4)(+||−)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.

关 键 词：Heterostructure Synergetic effect Self-nitridation Electrocatalysis Water splitting 

分 类 号：O64[理学—物理化学]