The one-pot synthesis of porous Ni0.85Se nanospheres on graphene as an efficient and durable electrocatalyst for overall water splitting
NEW JOURNAL OF CHEMISTRY(2020)
摘要
The design and preparation of highly efficient and durable non-noble metal electrocatalysts for overall water splitting is pivotal for actualizing large-scale water splittingviaelectrolysis. Herein, porous Ni0.85Se nanospheres anchored on reduced graphene oxide (RGO) (Ni0.85Se/RGO) were synthesizedviaa one-step hydrothermal method. Following explorations of the hydrothermal temperature and reaction time, the optimized Ni0.85Se/RGO exhibited extraordinary oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance in 1.0 M KOH solution, providing an overpotential as small as 320 mV at a current density of 30 mA cm(-2)and a low Tafel slope of 91 mV dec(-1)for the OER, and an overpotential of 169 mV at a current density of 10 mA cm(-2)and a low Tafel slope of 65 mV dec(-1)for the HER. A current density of 10 mA cm(-2)at 1.64 V and high stability can be obtained upon using Ni0.85Se/RGO as both the cathode and anode for overall water splitting under alkaline conditions; this was attributed to the merits of both the porous structure of Ni0.85Se and the high conductivity of RGO. This work provides a meaningful exploration of the synthesis of 3d-transition-metal-chalcogenide- and carbon-based composite electrocatalystsviaa hydrothermal reaction for water splitting, and provides a general method.
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关键词
graphene,durable electrocatalyst,ni<sub>085</sub>se nanospheres,water splitting,porous ni<sub>085</sub>se,one-pot
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