Support-nanoparticle composite, catalyst containing same, and fabrication method therefor
A carrier-nanoparticle complex including: a carbon carrier; a polymer layer provided on a surface of the carbon carrier; and metal nanoparticles provided on the polymer layer, a catalyst including the same, an electrochemical cell or a fuel cell including the catalyst, and a method for preparing the same.
1. A carrier-nanoparticle complex in an electrochemical cell or in a fuel cell, comprising:
a carbon carrier comprising carbon black;
a polymer layer provided on a surface of the carbon carrier, the polymer layer comprising polymer having a pyridine group at a side chain thereof; and
metal nanoparticles provided on the polymer layer,
wherein the polymer having the pyridine group at the side chain thereof comprises poly (4-vinyl pyridine) (P4VP),
wherein 50% to 100% of a surface of the carbon carrier is provided with the polymer layer,
wherein the metal nanoparticles comprise platinum,
wherein the metal nanoparticles have an average particle diameter of 2 nm to 20 nm,
wherein a content of the metal nanoparticles is 20 wt % to 70 wt % based on a total weight of the carrier-nanoparticle complex,
wherein BET value of the carbon carrier is 70m 2 /g to 250m 2 /g,
wherein a platinum particle supporting ratio on the carrier-nanoparticle complex is 75.3% to 84.3%, and
wherein the particle supporting ratio (%) is according to Equation 1:
Particle supporting ratio (%)=Actual supported amount×100/Target supported amount [Equation 1]
wherein the actual supported amount is a content of Pt measured by an ICP analysis, and the target supported amount is a value calculated through the weight of a precursor used as compared to the total weight of the carrier-nanoparticle complex.
2. The carrier-nanoparticle complex of claim 1 , wherein a weight average molecular weight of the polymer is greater than or equal to 500 g/mol and less than or equal to 1,000,000 g/mol.
3. A catalyst comprising the carrier-nanoparticle complex according to claim 1 .
4. An electrochemical cell comprising the catalyst of claim 3 .
5. A membrane electrode assembly comprising: an anode catalyst layer; a cathode catalyst layer; and a polymer electrolyte membrane provided between the anode catalyst layer and the cathode catalyst layer, wherein at least one of the anode catalyst layer and the cathode catalyst layer comprises the carrier-nanoparticle complex according to claim 1 .
6. A method for preparing the carrier-nanoparticle complex according to claim 1 , the method comprising:
forming the polymer layer on the surface of the carbon carrier, the polymer layer comprising polymer having a pyridine group at a side chain thereof; and
forming the metal nanoparticles on the polymer layer of the carbon carrier by adding the carbon carrier having the polymer layer formed and a metal precursor to a solvent.
7. The method of claim 6 , further comprising: heat-treating or acid-treating the metal nanoparticles after the forming of the metal nanoparticles on the polymer layer.