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Coupling of Bifunctional CoMn‐Layered Double Hydroxide@Graphitic C 3 N 4 Nanohybrids towards Efficient Photoelectrochemical Overall Water Splitting
Author(s) -
Arif Muhammad,
Yasin Ghulam,
Shakeel Muhammad,
Fang Xiaoyu,
Gao Rui,
Ji Shengfu,
Yan Dongpeng
Publication year - 2018
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.201800016
Subject(s) - water splitting , overpotential , photocurrent , electrochemistry , current density , oxygen evolution , electrolysis , electrolysis of water , hydroxide , bifunctional , materials science , catalysis , chemistry , photocatalysis , inorganic chemistry , electrode , optoelectronics , physics , electrolyte , biochemistry , quantum mechanics
The development of durable, low‐cost, and efficient photo‐/electrolysis for the oxygen and hydrogen evolution reactions (OER and HER) is important to fulfill increasing energy requirements. Herein, highly efficient and active photo‐/electrochemical catalysts, that is, CoMn‐LDH@g‐C 3 N 4 hybrids, have been synthesized successfully through a facile in situ co‐precipitation method at room temperature. The CoMn‐LDH@g‐C 3 N 4 composite exhibits an obvious OER electrocatalytic performance with a current density of 40 mA cm −2 at an overpotential of 350 mV for water oxidation, which is 2.5 times higher than pure CoMn‐LDH nanosheets. For HER, CoMn‐LDH@g‐C 3 N 4 ( η 50 =−448 mV) requires a potential close to Pt/C ( η 50 =−416 mV) to reach a current density of 50 mA cm 2 . Furthermore, under visible‐light irradiation, the photocurrent density of the CoMn‐LDH@g‐C 3 N 4 composite is 0.227 mA cm −2 , which is 2.1 and 3.8 time higher than pristine CoMn‐LDH (0.108 mA cm −2 ) and g‐C 3 N 4 (0.061 mA cm −2 ), respectively. The CoMn‐LDH@g‐C 3 N 4 composite delivers a current density of 10 mA cm −2 at 1.56 V and 100 mA cm −2 at 1.82 V for the overall water‐splitting reaction. Therefore, this work establishes the first example of pure CoMn‐LDH and CoMn‐LDH@g‐C 3 N 4 hybrids as electrochemical and photoelectrochemical water‐splitting systems for both OER and HER, which may open a pathway to develop and explore other LDH and g‐C 3 N 4 nanosheets as efficient catalysts for renewable energy applications.