Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 2, Pages 1728-1733Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16125
Keywords
hydrogen evolution; surface modulation; interface engineering; NiMo; electrocatalysis
Funding
- National 1000-Plan program
- National Natural Science Foundation of China [21401148, 51672229]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20160229165240684]
- Environment and Conservation Fund of Hong Kong SAR, China [ECF 2016-85]
- Cyrus Tang Foundation through Tang Scholar Program
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The interface between electrolytes and electrocatalysts would largely determine their corresponding activity and stability. Herein, modulating the surface characteristics of NiMo nanoparticles by various adsorbed amines gives the tunability on their interfacial properties and subsequently improves their catalytic performance for hydrogen evolution reaction (HER) in alkaline solutions. Diamines can significantly improve their HER activity by decreasing the charge-transfer resistance and modulating the electronic structures of interfacial active sites. Importantly, among various amines, ethylenediamine facilitates the HER activity of NiMo with a remarkable decrease of 268 mV in the overpotential to reach 10 mA cm(-2) as compared with that of the unmodified NiMo in 1.0 M KOH. This method provides a novel strategy of regulating the interfacial properties to strengthen the catalytic performance of electrocatalysts.
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