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In Situ Antisolvent Approach to Hydrangea‐like HCo 3 O 4 ‐NC@CoNi‐LDH Core@Shell Superstructures for Highly Efficient Water Electrolysis
Author(s) -
Zhang Hao,
Tong Yinlin,
Xu Jiaying,
Lu Qingyi,
Gao Feng
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703796
Subject(s) - tafel equation , overpotential , oxygen evolution , catalysis , hydroxide , electrolysis of water , materials science , chemical engineering , nanoparticle , electrolysis , inorganic chemistry , chemistry , nanotechnology , electrode , electrochemistry , electrolyte , organic chemistry , engineering
Abstract Highly active, durable, and cost‐effective electrocatalysts for water oxidation are at the center of renewable energy technologies. However, the development of water oxidation catalysts with high activity at low cost remains a great challenge. Herein, an in situ antisolvent approach is reported for synthesizing ultrathin Co–Ni layered double hydroxide (CoNi‐LDH) nanosheets wrapped on hollow Co 3 O 4 nanoparticle‐embedded nitrogen‐doped carbon (HCo 3 O 4 ‐NC) as a high‐performance catalyst for the oxygen evolution reaction (OER). Although HCo 3 O 4 ‐NC or NiCo‐LDH alone has little OER activity, their hybrid exhibits low overpotential and Tafel slope as well as high stability, due to the synergistic effect of Co 3 O 4 and LDH. Furthermore, the hydrangea‐like HCo 3 O 4 ‐NC@NiCo‐LDH core@shell composite exhibits higher catalytic activity and stability than commercial IrO 2 , which makes it a high‐performance nonprecious‐metal‐based catalyst for OER.