Construction of 3D hollow NiCo-layered double hydroxide nanostructures for high-performance industrial overall seawater electrolysis  

作　　者：Lili Wang Di Wang Linlin Zheng Xiaorong Song Ya Yan Jiahui Li Shuheng Tian Maolin Wang Mi Peng Zhaohui Yin Hong Wang Junqing Xu Bowen Cheng Zhen Yin Ding Ma 

机构地区：[1]State Key Laboratory of Separation Membranes and Membrane Processes, School of Chemistry, Tiangong University, Tianjin, 300387, China [2]Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering and College of Engineering, and BIC-ESAT, Peking University, Beijing, 100871, China [3]College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin, 300457, China [4]State Key Laboratory of Biobased Fiber Manufacturing Technology, Tianjin University of Science and Technology, Tianjin, 300457, China [5]School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, China [6]China Tianchen Engineering Corporation, Tianjin, 300400, China

出　　处：《Nano Research》2024年第11期9472-9482,共11页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51908408 and 21872104);Natural Science Foundation of Tianjin for Distinguished Young Scholar,China(No.20JCJQJC00150).

摘　　要：Green hydrogen production via seawater electrolysis holds a great promise for carbon-neutral energy production. However, the development of efficient and low-cost bifunctional electrocatalysts for seawater electrolysis at an industrial level remains a significant challenge. Herein, we report a facile approach based on one-dimensional (1D) cobalt carbonate hydroxide (CCH) nanoneedles (NNs) as skeleton and zeolitic imidazolate framework-67 (ZIF-67) as a sacrificial template to construct a self-supported NiCo layered double hydroxide (NiCo LDH) heterostructure nanocage (CCH@NiCo LDH) anchoring on the carbon felt (CF). The NiCo LDHs have hollow features, consisting of ultrathin layered hydroxide nanosheets. Benefiting from the structural advantages, unique carbon substrate and desirable composition, three-dimensional (3D) NiCo LDH nanocages exhibit superior performance as a bifunctional catalyst for overall seawater splitting at an industrial level and good corrosion resistance in alkaline media. In the alkaline seawater (1 M KOH + 0.5 M NaCl), it exhibits low overpotentials of 356 mV for hydrogen evolution reaction (HER) and 433 mV for oxygen evolution reaction (OER) at 400 mA·cm^(−2), much better than most of reported non-noble metal catalysts. Consequently, the obtained CF electrode loading of CCH@NiCo LDH exhibits outstanding performance as anodes and cathodes for overall alkaline seawater splitting, with remarkably low cell voltages of 1.56 and 1.89 V at current densities of 10 and 400 mA·cm^(−2), respectively. Moreover, the robust stability of 100 h is also demonstrated at above 200 mA·cm^(−2) in alkaline seawater. Our present work demonstrates significant potential for constructing effective cost-efficient and non-noble-metal bifunctional electrocatalyst and electrode for industrial seawater splitting.

关 键 词：seawater splitting bifunctional electrocatalyst NiCo layered double hydroxide(NiCo LDH) hollow nanocages carbon felt 

分 类 号：O64[理学—物理化学]