Citation: Zixia Wan, Qiuting He, Jundan Chen, Tayirjan Taylor Isimjan, Bao Wang, Xiulin Yang. Dissolution-regrowth of hierarchical Fe-Dy oxide modulates the electronic structure of nickel-organic frameworks as highly active and stable water splitting electrocatalysts[J]. Chinese Journal of Catalysis, ;2020, 41(11): 1745-1753. doi: 10.1016/S1872-2067(20)63606-3 shu

Dissolution-regrowth of hierarchical Fe-Dy oxide modulates the electronic structure of nickel-organic frameworks as highly active and stable water splitting electrocatalysts

a Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, Guangxi, China;
b State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
c Saudi Arabia Basic Industries Corporation(SABIC) at King Abdullah University of Science and Technology(KAUST), Thuwal 23955-6900, Saudi Arabia

Received Date: 26 February 2020
Revised Date: 31 March 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (21965005), Natural Science Foundation of Guangxi Province (2018GXNSFAA294077), Project of High-Level Talents of Guangxi (F-KA18015, 2018ZD004), and Innovation Project of Guangxi Graduate Education (XYCSZ2019056, YCBZ2019031).

As the kinetically sluggish oxygen evolution reaction (OER) is considered to be a bottleneck in overall water splitting, it is necessary to develop a highly active and stable electrocatalyst to overcome this issue. Herein, we successfully fabricated a three-dimensional iron-dysprosium oxide co-regulated in-situ formed MOF-Ni arrays on carbon cloth (FeDy@MOF-Ni/CC) through a facile two-step hydrothermal method. Electrochemical studies demonstrate that the designed FeDy@MOF-Ni/CC catalyst requires an overpotential of only 251 mV to reach 10 mA cm^-2 with a small Tafel slope of 52.1 mV dec^-1. Additionally, the stability declined by only 5.5% after 80 h of continuous testing in 1.0 M KOH. Furthermore, a cell voltage of only 1.57 V in the overall water splitting system is sufficient to achieve 10 mA cm^-2; this value is far better than that of most previously reported catalysts. The excellent catalytic performance originates from the unique 3D rhombus-like structure, as well as coupling synergies of Fe-Dy-Ni species. The combination of lanthanide and transition metal species in the synthesis strategy may open entirely new possibilities with promising potential in the design of highly active OER electrocatalysts.
- Metal-organic frameworks,
- Dysprosium oxide,
- Synergistic effect,
- Oxygen evolution,
- Water splitting
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