Table 1 Spectroscopic and electrochemical properties of the systems for H2 evolution.

From: Chitosan confinement enhances hydrogen photogeneration from a mimic of the diiron subsite of [FeFe]-hydrogenase

H 2 evolution system

*λ (nm)

*Ï„ (ns)

*Ф (%)

† E 00 (eV)

‡kq (l mol−1)

§ E red (eV)

§ Δ G 0 (eV)

|| TON

CdTe QDs

575

10.9

5.1

2.16

(9.95±0.67) × 103

−1.10

−0.97

12.7±1.3

CdTe QDs+chitosan

557

18.3

38.3

2.23

(2.26±0.02) × 104

−1.10

−1.04

(5.28±0.17) × 104

  1. TON, turnover number; QDs, quantum dots.
  2. *Photoluminescent wavelength (λ), lifetime (τ) and quantum yield (Ф) of the MPA-CdTe QDs in methanol/water (1:3, v-v) at pH 4.5. The photoluminescent quantum yield (Ф) was determined by equation Ф=(I/Is)(As/A)(n/ns)2Фs, where I is the luminescent intensity, A is the absorbance, n is the refractive index of the solvent. Rhodamine 101 was used as the standard with Фs (%) being 100 in ethanol60.
  3. †The excited-state energy (E00) of the MPA-CdTe QDs was determined by the equation E00=hc/λ.
  4. ‡The quenching constant (kq) of the MPA-CdTe QDs by [Fe2(CO)6(μ-adt)CH2C6H5] catalyst was determined by Stern–Volmer equation: kq=[I0/Ip−1]/[Q], I is the photoluminescent intensity of the MPA-CdTe QDs, [Q] is the concentration of [Fe2(CO)6(μ-adt)CH2C6H5] catalyst.
  5. §The reduction potential (Ered) of [Fe2(CO)6(μ-adt)CH2C6H5] catalyst in methanol/water (1:1, v-v) at pH 4.5 and the free-energy change (ΔG0) of photoinduced electron transfer from the MPA-CdTe QDs to [Fe2(CO)6(μ-adt)CH2C6H5] catalyst was determined by Rehm–Weller equation ΔG0=Evb−Ered−E00, where the valence-band energy level (Evb) of the MPA-CdTe QDs is 0.09 V (ref. 58).
  6. ||The TON of photocatalytic H2 evolution under the optimized condition.
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