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Controlled Synthesis of 3D Flower‐like Ni 2 P Composed of Mesoporous Nanoplates for Overall Water Splitting
Author(s) -
Zheng Haiyan,
Huang Xiubing,
Wu Zhenyu,
Gao Hongyi,
Dong Wenjun,
Wang Ge
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201701255
Subject(s) - tafel equation , overpotential , water splitting , oxygen evolution , mesoporous material , materials science , catalysis , chemical engineering , electrolyte , current density , nanotechnology , chemistry , electrochemistry , electrode , organic chemistry , physics , photocatalysis , quantum mechanics , engineering
Developing efficient non‐noble metal and earth‐abundant electrocatalysts with tunable microstructures for overall water splitting is critical to promote clean energy technologies for a hydrogen economy. Herein, novel three‐dimensional (3D) flower‐like Ni 2 P composed of mesoporous nanoplates with controllable morphology and high surface area was prepared by a hydrothermal method and low‐temperature phosphidation as efficient electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Compared with the urchin‐like Ni x P y , the 3D flower‐like Ni 2 P with a diameter of 5 μm presented an efficient and stable catalytic performance in 0.5 m H 2 SO 4 , with a small Tafel slope of 79 mV dec −1 and an overpotential of about 240 mV at a current density of 10 mA cm −2 with a mass loading density of 0.283 mg cm −2 . In addition, the catalyst also exhibited a remarkable performance for the OER in 1.0 m KOH electrolyte, with an overpotential of 320 mV to reach a current density of 10 mA cm −2 and a small Tafel slope of 72 mV dec −1 . The excellent catalytic performance of the as‐prepared Ni 2 P may be ascribed to its novel 3D morphology with unique mesoporous structure.