Journal
ADVANCED MATERIALS
Volume 29, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201703057
Keywords
durability; ethanol oxidation reaction; Pd nanocrystals; promoting effect of Ni(OH)(2); selectivity
Categories
Funding
- National Natural Science Foundation of China [51472173, 51522208, 21473039]
- Natural Science Foundation of Jiangsu Province [BK20140302, SBK2015010320]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, Collaborative Innovation Center of Suzhou Nano Science and Technology
- 111 project
- National 973 Program [2015CB932303]
- NSERC Canada
- Canadian Funding agency CFI
- Canadian Funding agency NSERC
- Canadian Funding agency NRC
- Canadian Funding agency CIHR
- Canadian Funding agency University of Saskatchewan
- Canadian Funding agency Government of Saskatchewan
- Canadian Funding agency Western Economic Diversification Canada
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Most electrocatalysts for the ethanol oxidation reaction suffer from extremely limited operational durability and poor selectivity toward the C-C bond cleavage. In spite of tremendous efforts over the past several decades, little progress has been made in this regard. This study reports the remarkable promoting effect of Ni(OH)(2) on Pd nanocrystals for electrocatalytic ethanol oxidation reaction in alkaline solution. A hybrid electrocatalyst consisting of intimately mixed nanosized Pd particles, defective Ni(OH)(2) nanoflakes, and a graphene support is prepared via a two-step solution method. The optimal product exhibits a high mass-specific peak current of > 1500 mA mg(-1) Pd, and excellent operational durability forms both cycling and chronoamperometric measurements in alkaline solution. Most impressively, this hybrid catalyst retains a mass-specific current of 440 mA mg(-1) even after 20 000 s of chronoamperometric testing, and its original activity can be regenerated via simple cyclic voltammetry cycles in clean KOH. This great catalyst durability is understood based on both CO stripping and in situ attenuated total reflection infrared experiments suggesting that the presence of Ni(OH)(2) alleviates the poisoning of Pd nanocrystals by carbonaceous intermediates. The incorporation of Ni(OH)(2) also markedly shifts the reaction selectivity from the originally predominant C2 pathway toward the more desirable C1 pathway, even at room temperature.
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