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Ultrathin Porous NiFeV Ternary Layer Hydroxide Nanosheets as a Highly Efficient Bifunctional Electrocatalyst for Overall Water Splitting
Author(s) -
Dinh Khang Ngoc,
Zheng Penglun,
Dai Zhengfei,
Zhang Yu,
Dangol Raksha,
Zheng Yun,
Li Bing,
Zong Yun,
Yan Qingyu
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201703257
Subject(s) - electrocatalyst , water splitting , tafel equation , overpotential , oxygen evolution , materials science , chemical engineering , ternary operation , bifunctional , hydroxide , electrolyte , layered double hydroxides , inorganic chemistry , catalysis , electrode , chemistry , electrochemistry , photocatalysis , computer science , engineering , programming language , biochemistry
Abstract Herein, the hydrothermal synthesis of porous ultrathin ternary NiFeV layer double hydroxides (LDHs) nanosheets grown on Nickel foam (NF) substrate as a highly efficient electrode toward overall water splitting in alkaline media is reported. The lateral size of the nanosheets is about a few hundreds of nanometers with the thickness of ≈10 nm. Among all molar ratios investigated, the Ni 0.75 Fe 0.125 V 0.125 ‐LDHs/NF electrode depicts the optimized performance. It displays an excellent catalytic activity with a modest overpotential of 231 mV for the oxygen evolution reaction (OER) and 125 mV for the hydrogen evolution reaction (HER) in 1.0 m KOH electrolyte. Its exceptional activity is further shown in its small Tafel slope of 39.4 and 62.0 mV dec −1 for OER and HER, respectively. More importantly, remarkable durability and stability are also observed. When used for overall water splitting, the Ni 0.75 Fe 0.125 V 0.125 ‐LDHs/NF electrodes require a voltage of only 1.591 V to reach 10 mA cm −2 in alkaline solution. These outstanding performances are mainly attributed to the synergistic effect of the ternary metal system that boosts the intrinsic catalytic activity and active surface area. This work explores a promising way to achieve the optimal inexpensive Ni‐based hydroxide electrocatalyst for overall water splitting.