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Strong Electronic Interaction in Dual‐Cation‐Incorporated NiSe 2 Nanosheets with Lattice Distortion for Highly Efficient Overall Water Splitting
Author(s) -
Sun Yiqiang,
Xu Kun,
Wei Zengxi,
Li Huilin,
Zhang Tao,
Li Xinyang,
Cai Weiping,
Ma Jianmin,
Fan Hong Jin,
Li Yue
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201802121
Subject(s) - overpotential , water splitting , materials science , electrocatalyst , oxygen evolution , nanosheet , electrochemistry , catalysis , inorganic chemistry , bifunctional , electrode , chemical engineering , nanotechnology , chemistry , biochemistry , photocatalysis , engineering
Exploring highly efficient and low‐cost electrocatalysts for electrochemical water splitting is of importance for the conversion of intermediate energy. Herein, the synthesis of dual‐cation (Fe, Co)‐incorporated NiSe 2 nanosheets (Fe, Co‐NiSe 2 ) and systematical investigation of their electrocatalytic performance for water splitting as a function of the composition are reported. The dual‐cation incorporation can distort the lattice and induce stronger electronic interaction, leading to increased active site exposure and optimized adsorption energy of reaction intermediates compared to single‐cation‐doped or pure NiSe 2 . As a result, the obtained Fe 0.09 Co 0.13 ‐NiSe 2 porous nanosheet electrode shows an optimized catalytic activity with a low overpotential of 251 mV for oxygen evolution reaction and 92 mV for hydrogen evolution reaction (both at 10 mA cm −2 in 1 m KOH). When used as bifunctional electrodes for overall water splitting, the current density of 10 mA cm −2 is achieved at a low cell voltage of 1.52 V. This work highlights the importance of dual‐cation doping in enhancing the electrocatalyst performance of transition metal dichalcogenides.