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

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

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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.

HeterostructureSynergetic effectSelf-nitridationElectrocatalysisWater splitting

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

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School of Physics and Materials Science,Nanchang University,Nanchang 330031,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Project of Natural Science Foundation of Jiangxi Province

222650182196101920232ACB204010

2024

10.1016/j.jmst.2024.01.043

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.197(30)