2021
DOI: 10.1021/acs.jpcc.1c03553
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Abstract: Dye-sensitized photoelectrochemical (DSPEC) water splitting is an attractive approach to convert and store solar energy into chemical bonds. However, the solar conversion efficiency of a DSPEC cell is typically low due to a poor performance of the photocathode. Here, we demonstrate that Cu-doping improves the performance of a functionalized NiO-based photocathode significantly. Femtosecond transient absorption experiments show longer-lived photoinduced charge separation for the Cu:NiO-based photocathode relati… Show more

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Cited by 16 publications
(8 citation statements)
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References 64 publications
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“…The P1 excited state (P1*) is known to give a strong and broad positive absorbance above 550–560 nm and a weak absorbance around 410 nm. , Due to hole injection from P1* into NiO, the intensity of P1* decreases, whereas the characteristic spectrum of P1 •– arises (positive bands around 420 and 610 nm) . Photoinduced hole injection is known to cause a red shift in the TA spectrum due to overlapping signals of P1 GSB, P1*, P1 •– , and Ni 3+/4+ , (Supporting Information Figure S3). It is notable that the spectra for NiO/P1 in air and especially in PBS at early times (<1 ps) are red-shifted compared to those of NiO/P1 in MeCN, which can be explained by more photoinduced hole injection within the instrumental response time (IRT, 100–150 fs) in air/PBS.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The P1 excited state (P1*) is known to give a strong and broad positive absorbance above 550–560 nm and a weak absorbance around 410 nm. , Due to hole injection from P1* into NiO, the intensity of P1* decreases, whereas the characteristic spectrum of P1 •– arises (positive bands around 420 and 610 nm) . Photoinduced hole injection is known to cause a red shift in the TA spectrum due to overlapping signals of P1 GSB, P1*, P1 •– , and Ni 3+/4+ , (Supporting Information Figure S3). It is notable that the spectra for NiO/P1 in air and especially in PBS at early times (<1 ps) are red-shifted compared to those of NiO/P1 in MeCN, which can be explained by more photoinduced hole injection within the instrumental response time (IRT, 100–150 fs) in air/PBS.…”
Section: Resultsmentioning
confidence: 99%
“…A possible reason for this fast charge recombination after hole injection is hole accumulation. Transition metal hydroxyl oxides are well-known supercapacitor materials, and they have the ability to store charges, either from the additional bias or from photogenerated charges. , In addition, NiO is a p-type material but suffers from a poor hole mobility, which means that after ultrafast hole injection, most of the holes likely remain at, or close to the OH – -terminated surface. This is in agreement with literature studies reporting holes to be mainly pinned at the NiO surface, increasing the chance to recombine with P1 •– .…”
Section: Resultsmentioning
confidence: 99%
“…However, whether an applied potential has the same effect on DSPEC cells with their configuration based on lightinduced charge separation at the dye-semiconductor interface rather than inside the semiconductor is unknown, although some dye-sensitized photocathodes show surprisingly low photocurrents at more negative bias potentials. [17][18] The composition of the electrolyte may also play an important role here.…”
Section: Fe2o3 or Cu2omentioning
confidence: 99%
“…This concern can be addressed by using doped or multimetal TMOs. Cu-doping of NiO was found to reduce ultrafast charge recombination, which improved the photocatalytic conversion properties by lowering the band gap . In La-doped (Ni 3 (NO 3 ) 2 (OH) 4 nanoflowers, La cations with large diameters functioned as pillars, increased the c-axis spacing, and led to an effective enhancement of ionic diffusivity and electronic conductivity …”
Section: Introductionmentioning
confidence: 99%
“…Cu-doping of NiO was found to reduce ultrafast charge recombination, which improved the photocatalytic conversion properties by lowering the band gap. 10 In La-doped (Ni 3 (NO 3 ) 2 (OH) 4 nanoflowers, La cations with large diameters functioned as pillars, increased the c-axis spacing, and led to an effective enhancement of ionic diffusivity and electronic conductivity. 11 In this study, we report the synthesis, characterization, and application of Zn-doped NiO (Zn:NiO) microstars to high performance supercapacitors and high-contrast ECDs with panchromatic visible light absorption capability.…”
Section: Introductionmentioning
confidence: 99%