writer：Liting Yan, Lei Cao, Pengcheng Dai, Xin Gu, Dandan Liu, Liangjun Li, Ying Wang, and Xuebo Zhao*
keywords：MOF, Nanotube, Electrocatalyst,Overall water splitting
source：期刊
specific source：Adv. Funct. Mater. 2017, 27, 1703455
Issue time：2017年

The design of highly efficient, stable, and noble-metal-free bifunctional

electrocatalysts for overall water splitting is critical but challenging. Herein, a

facile and controllable synthesis strategy for nickel–cobalt bimetal phosphide

nanotubes as highly efficient electrocatalysts for overall water splitting via

low-temperature phosphorization from a bimetallic metal-organic framework

(MOF-74) precursor is reported. By optimizing the molar ratio of Co/Ni atoms

in MOF-74, a series of CoxNiyP catalysts are synthesized, and the obtained

Co4Ni1P has a rare form of nanotubes that possess similar morphology

to the MOF precursor and exhibit perfect dispersal of the active sites. The

nanotubes show remarkable hydrogen evolution reaction (HER) and oxygen

evolution reaction (OER) catalytic performance in an alkaline electrolyte,

affording a current density of 10 mA cm?2 at overpotentials of 129 mV for

HER and 245 mV for OER, respectively. An electrolyzer with Co4Ni1P nanotubes

as both the cathode and anode catalyst in alkaline solutions achieves a

current density of 10 mA cm?2 at a voltage of 1.59 V, which is comparable to

the integrated Pt/C and RuO2 counterparts and ranks among the best of the

metal-phosphide electrocatalysts reported to date.