000			02790nam a2200313Ia 4500
001			205262
003			BIBL
005			20210323145529.0
008			891025s2019 pr ad b 00110 egn d
040			_aPUCPR _bspa _erda _cPUCPR _dPUCPR
049			_aPUCPR
082			_223 _aT 669.3 _bM553m CD
092			_223 _aT 669.3 _bM553m CD
100	1		_aMercado Velázquez, José J. _9298075
245	1	0	_aMolecularly-directed deposition of copper on polycrystalline Pt substrates / _cby José J. Mercado Velázquez.
260			_c2019.
300			_a146 leaves ; _bgraphics
336			_2rdacontent _btxt
337			_2rdamedia _bn
338			_2rdacarrier _bnc
502			_aThesis (Master in Science-Chemistry) - Pontifical Catholic University of Puerto Rico.
504			_aBibliografical references: leaves 130-134.
520			_aElectrochemical reactivity is sensitive to compositional and structural changes in the electrode surface. In this work Cyclic Voltammetry (CV) was used to correlate Current (i) vs Potential (V) curves that served as a fingerprint of the electrode surface composition and structure. This research outlined a new method to molecularly direct the deposition of copper using aromatic molecules such as hydroquinone, catechol, pyridine and aniline as guide probes at model Pt electrocatalyst surfaces. Results showed that bulk copper deposition var-ies as a function of the following experimental conditions: applied potential, electrochemical pretreatment, electrode surface structure and the molecular-guide probe used to chemically pretreat the Pt(poly) surfaces. It was found that copper was deposited preferentially to some specific surface domains of the platinum electrode when the deposition is guided by aromatic molecules. Using optical detection of bulk copper deposition at Pt surface, information about where the deposition specifically takes place was obtained with stereographic projection. It was possible to correlate at what kind of structural surface domain the deposition took place. It was found that copper, guided by the molecular probes, start its deposition in stepped and kinked surfaces avoiding the basal planes Pt(111), Pt(110) and Pt(100), with a preference for the Pt(100) four fold site. It was concluded that the different patterns of Cu(bulk) deposition obtained were due to selective ligand displacement between Cu and the probe molecules acting as surface modifiers on the Pt surface.
610		7	_9294920 _aPontificia Universidad Católica de Puerto Rico _xDissertations _2Local
650		0	_aCopper _980610
650		0	_aPolycrystals _9298074
710	2		_9294919 _aPontificia Universidad Católica de Puerto Rico. _bColegio de Ciencias. _bDepartamento de Química
942			_2ddc _c3 _hT 669.3 _mM553m CD
999			_c295864 _d295864