TY - JOUR
T1 - Two-Dimensional Cobalt Phosphate Hydroxide Nanosheets
T2 - A New Type of High-Performance Electrocatalysts with Intrinsic CoO6 Lattice Distortion for Water Oxidation
AU - Bu, Xiuming
AU - Chiang, Chaolung
AU - Wei, Renjie
AU - Li, Zebiao
AU - Meng, You
AU - Peng, ChunKuo
AU - Lin, YuChang
AU - Li, Yangyang
AU - Lin, YanGu
AU - Chan, Kwok Sum
AU - Ho, Johnny C.
PY - 2019/10/23
Y1 - 2019/10/23
N2 - Despite the recent advances in electrochemical water splitting, developing cost-effective and highly efficient electrocatalysts for oxygen evolution reaction (OER) still remains a substantial challenge. Herein, two-dimensional cobalt phosphate hydroxides (Co5(PO4)2(OH)4) nanosheets, a unique stacking-disordered phosphate-based inorganic material, are successfully prepared via a facile and scalable method for the first time to serve as a superior and robust electrocatalyst for water oxidation. On the basis of the detailed characterization (e.g., X-ray absorption near-edge structure and X-ray photoelectron spectroscopy), the obtained nanosheets consist of special zigzag CoO6 octahedral chains along with intrinsic lattice distortion and excellent hydrophilicity, in which these factors contribute to the highly efficient performance of prepared electrocatalysts for OER. Specifically, Co5(PO4)2(OH)4 deposited on glassy carbon electrode (loading amount ≈0.553 mg cm-2) can exhibit an unprecedented overpotential of 254 mV to drive a current density of 10 mA cm-2 with a small Tafel slope of 57 mV dec-1 in alkaline electrolytes, which outperforms the ones of CO3(PO4)2 (370 mV) and Co(OH)2 (360 mV) as well as other advanced catalysts. Evidently, this work has opened a new pathway to the rational design of promising metal phosphate hydroxides toward the efficient electrochemical energy conversion.
AB - Despite the recent advances in electrochemical water splitting, developing cost-effective and highly efficient electrocatalysts for oxygen evolution reaction (OER) still remains a substantial challenge. Herein, two-dimensional cobalt phosphate hydroxides (Co5(PO4)2(OH)4) nanosheets, a unique stacking-disordered phosphate-based inorganic material, are successfully prepared via a facile and scalable method for the first time to serve as a superior and robust electrocatalyst for water oxidation. On the basis of the detailed characterization (e.g., X-ray absorption near-edge structure and X-ray photoelectron spectroscopy), the obtained nanosheets consist of special zigzag CoO6 octahedral chains along with intrinsic lattice distortion and excellent hydrophilicity, in which these factors contribute to the highly efficient performance of prepared electrocatalysts for OER. Specifically, Co5(PO4)2(OH)4 deposited on glassy carbon electrode (loading amount ≈0.553 mg cm-2) can exhibit an unprecedented overpotential of 254 mV to drive a current density of 10 mA cm-2 with a small Tafel slope of 57 mV dec-1 in alkaline electrolytes, which outperforms the ones of CO3(PO4)2 (370 mV) and Co(OH)2 (360 mV) as well as other advanced catalysts. Evidently, this work has opened a new pathway to the rational design of promising metal phosphate hydroxides toward the efficient electrochemical energy conversion.
KW - Co5(PO4)2(OH)4
KW - electrocatalyst
KW - lattice distortion
KW - nanosheet
KW - oxygen evolution reaction
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U2 - 10.1021/acsami.9b11594
DO - 10.1021/acsami.9b11594
M3 - RGC 21 - Publication in refereed journal
SN - 1944-8244
VL - 11
SP - 38633−38640
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 42
ER -