(215e) Strongly Coupled 3D Ternary Fe2O3@Ni2p/Ni(PO3)2 Hybrid for Enhanced Electrocatalytic Oxygen Evolution at Ultra-High Current Densities | AIChE

(215e) Strongly Coupled 3D Ternary Fe2O3@Ni2p/Ni(PO3)2 Hybrid for Enhanced Electrocatalytic Oxygen Evolution at Ultra-High Current Densities


Cheng, X. Sr. - Presenter, College of Chemical and Biological Engineering
Strongly Coupled 3D Ternary Fe2O3@Ni2P/Ni(PO3)2 Hybrid for Enhanced Electrocatalytic Oxygen Evolution at Ultra-high Current Densities

Xiaodi Chenga, Zhiyan Panb, Chaojun Leia, Yangjun Jinb, Bin Yanga, Zhongjian Lia, Xingwang Zhanga, Lecheng Leia, Chris Yuan,c Yang Houa,*

aKey Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China. E-mail: yhou@zju.edu.cn

bEnvironmental Chemical and Resource Research Institute, College of Environment, Zhejiang University of Technology, Hangzhou, China.

cDepartment of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA.


Developing highly efficient non-noble metal electrocatalysts for oxygen evolution reaction (OER) at large current densities remains as one of the primary challenges for water electrolyzesr. Construction of transition metal phosphides/phosphates based hybrid electrocatalysts possessing synergistic effects between different active components based on their advantages could satisfy the prerequisite of activity and stability for OER. Transition metal oxides featuring iron have become one of the most promising OER electrocatalysts thanks to its inherent catalytic activity associated with natural abundance. Therefore, how to construct a hybrid electrocatalyst combining multiple active contents is a key issue to designing high active OER materials. Meticulous design and synthesis of the active sites of the electrocatalysts, and in-depth understanding of the catalytic mechanism are crucial for the development of new catalytic materials with sufficient active sites, thus realizing efficient water splitting.

Herein, we developed a novel 3D strongly coupled ternary hybrid composed of Ni2P/Ni(PO3)2 and Fe2O3 grown on the 3D Ni foam through a disproportionation reaction. In this 3D hybrid structure, the Fe2O3@Ni2P/Ni(PO3)2 nanoparticles with length of ~300 nm and width of ∼200 nm are homogeneously grown on the surface of 3D Ni foam. The outstanding OER activity can be attributed to the synergetic effect and strong coupling effect between the Fe2O3 and Ni2P/Ni(PO3)2. In situ Raman spectroscopy revealed that the NiOOH and FeOOH phases were the real active species in the Fe2O3@Ni2P/Ni(PO3)2/NF for OER. The excellent OER catalytic activity of 3D Fe2O3@Ni2P/Ni(PO3)2/NF could be donated to the synergic effect among the Fe2O3, Ni2P, and Ni(PO3)2 in addition to strong coupling effect. The NiOOH and FeOOH species acted as the active phases in Fe2O3@Ni2P/Ni(PO3)2/NF during OER process was proved through in situ Raman spectroscopy.

The 3D Fe2O3@Ni2P/Ni(PO3)2/NF hybrid achieves a superior electrocatalytic oxygen evolution reaction OER) performance at ultra-high current densities in alkaline electrolyte. The catalytic current densities of 500 and 1000 mA cm−2 are reached by applying only potentials of 1.57 and 1.60 V, respectively, which are almost the lowest potentials among all previously reported transition metal (Ni and Fe) based phosphides and phosphates electrocatalysts (Nat. Commun., 2018, 9, 2551; Energy Environ. Sci., 2018, 11, 1287-1298, etc.), and even better than that of the benchmark Ir/C catalyst (1.64 and > 1.8 V at 100 and 500 mA cm−2). Furthermore, In addition to the admirable OER activity and stability, the bifunctional 3D Fe2O3@Ni2P/Ni(PO3)2/NF delivered a cell voltage of 1.93, 2.48, and 3.02 V at 100, 500, and 1000 mA cm−2 toward overall-water-splitting.


Xiaodi Cheng received his bachelor's degree from Chemical Engineering Institute of Jinggangshan University in 2017. He is currently a Master in College of Chemical and Biological Engineering, Zhejiang University. His current research focuses on the design and synthesis of Ni-Fe based hybrids for energy and environmental applications.


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