Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 31, Pages 37063-37070Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c08429
Keywords
LDH-CP hybrid catalyst; interlayer confined polymerization; electrocatalysis for OER; in situ EQCM-D; in situ SECM
Funding
- Natural Science Foundation of China [21703003, 21972006]
- Shenzhen Peacock Plan [KQTD2016053015544057]
- Shenzhen Science and Technology Innovation Commission [JCYJ20180302153417057, JCYJ20190808155413194]
- Nanshan Pilot Plan [LHTD20170001]
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This study presents a method to tune the charge transfer and sorption-desorption properties of a catalyst by intercalating a conductive polymer into a layered double hydroxide, resulting in improved catalytic performance for the oxygen evolution reaction. In situ scanning electrochemical microscopy revealed that the hybrid catalyst exhibited a higher catalytic current density at the subnanometer scale compared to the bare catalyst.
Controlling and tuning surface properties of a catalyst have always been a prime challenge for efficient hydrogen production via water splitting. Here, we report a facile method for tuning both charger transfer and sorption-desorption properties of NiFe layered double hydroxide (LDH) by intercalating a conductive polymer of polypyrrole (ppy) via an interlayer confined polymerization synthesis (ICPS) process. Ex situ characterizations and in situ electrochemical quartz-crystal microbalance with dissipation (EQCM-D) tracking experiments showed that the intercalated ppy not only improved the charge transfer property of the resulting hybrid catalyst LDH-ppy but also made it more flexible and adaptive for quick and reversible sorption-desorption of reactants and intermediates during the oxygen evolution reaction (OER) process. Consequently, the as-prepared LDH-ppy exhibited a doubled catalytic current density over the bare LDH, as visualized by in situ scanning electrochemical microscopy (SECM) at the subnanometer scale. This work sheds light on orchestrating the charge and sorbate transfer abilities of catalysts for efficient water splitting by smartly combining inorganic and organic layers.
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