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.
基金项目
National Natural Science Foundation of China(22265018)
National Natural Science Foundation of China(21961019)
Key Project of Natural Science Foundation of Jiangxi Province(20232ACB204010)
NETL
NSTL
万方数据