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Changing the halide chemistry around platinum can change how effectively organic semiconductor nanoparticles produce hydrogen. A study published in ACS Energy Letters on September 29, 2026, reports that chloride-derived residues can block platinum active sites, while added iodide improved apparent quantum yield in one specific nanoparticle formulation. Its headline result—17% apparent quantum yield at 700 nm—is a laboratory measurement, not a commercial solar-to-hydrogen efficiency.
What the study tested
Arnau Bertran and coauthors examined platinum cocatalysts photodeposited on organic-semiconductor bulk-heterojunction (BHJ) nanoparticles. These materials combine donor and acceptor semiconductor components; platinum helps promote the hydrogen-evolution reaction. The team compared potassium hexahaloplatinate precursors, K₂PtX₆, where X was chlorine, bromine, or iodine, and investigated how the resulting surface chemistry affected hydrogen evolution.
The paper also compared two ways of preparing the platinum-bearing particles: depositing platinum in situ during hydrogen evolution, or pre-platinizing the particles and then dialyzing them. Its highlighted quantum-yield result concerns pre-platinized PTB7-Th:ITIC@TEBS nanoparticles. The experiments describe sacrificial hydrogen evolution with dilute ascorbic acid as a hole scavenger; they should not be described as overall water splitting.
Why the precursor halide matters
The authors report that chloroplatinate precursors can leave partially reduced [PtClₓ]ⁿ species adsorbed on platinum. In the studied BHJ systems, those chlorine-containing residues poison active sites and severely suppress hydrogen evolution when the system generates low photopotential. As the paper’s abstract puts it, they are “poisoning active sites and severely suppressing H₂ evolution rates in BHJ systems that generate low photopotential.”
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Bromo- and iodoplatinate precursors reduce more readily and largely avoid this poisoning in the studied context. The result highlights a catalyst-design variable beyond nominal platinum loading: the precursor’s halide can influence what remains at the platinum surface and how that surface behaves.
What the iodide result shows
In pre-platinized PTB7-Th:ITIC@TEBS nanoparticles, adding KI at 82 μM raised the reported apparent quantum yield (AQY) under 700 nm illumination from 11% without KI to 17%. The authors report this as a 56% AQY increase for that comparison.
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| Condition in the reported experiment | AQY at 700 nm |
|---|---|
| Pre-platinized PTB7-Th:ITIC@TEBS, without added KI | 11% (American Chemical Society, 2026) |
| Same named nanoparticle system, with 82 μM KI | 17% (American Chemical Society, 2026) |
| Reported relative increase with KI | 56% versus the no-KI baseline (American Chemical Society, 2026) |
The authors interpret the improvement as the result of iodide adsorbing on platinum, increasing surface electron density and potentially stabilizing Pt–H intermediates. They say photoelectrochemical chronoamperometry and Kelvin-probe force microscopy support their interpretation of platinum-surface poisoning. That is the authors’ proposed mechanism, rather than a general rule established for all platinum catalysts.
Pre-platinization is a separate comparison
The paper also reports a preliminary protocol comparison at the same nominal platinum loading of 16 wt%. Under its 1-sun testing conditions, pre-platinized BHJ nanoparticles reached a maximum hydrogen-evolution rate above 130 mmol h⁻¹ g⁻¹, compared with 60 mmol h⁻¹ g⁻¹ for in-situ platinized nanoparticles. The authors connect the difference to dialysis removing excess precursor and reduction products. These rates belong to that protocol comparison; they are not the 17% AQY result.
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| Platinum preparation | Nominal Pt loading | Reported maximum H₂-evolution rate under the stated 1-sun comparison |
|---|---|---|
| Pre-platinized, followed by dialysis | 16 wt% | Above 130 mmol h⁻¹ g⁻¹ (American Chemical Society, 2026) |
| In situ during hydrogen evolution | 16 wt% | 60 mmol h⁻¹ g⁻¹ (American Chemical Society, 2026) |
What the headline number does—and does not—mean
AQY at a specified wavelength describes a light-driven laboratory measurement under particular experimental conditions. The reported 17% applies to the named pre-platinized nanoparticle formulation with 82 μM KI under 700 nm illumination. It is not interchangeable with solar-to-hydrogen efficiency, an outdoor field result, or a commercial production rate. The paper characterizes the value as among the highest reported for BHJ nanoparticle photocatalysts; that is the authors’ literature-context claim.
The practical scientific point is narrower and useful: for these organic photocatalysts, platinum’s surface state—not just how much platinum is present—can affect hydrogen evolution. Precursor halide, cleanup after deposition, and iodide adsorption are variables worth distinguishing when interpreting performance.
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Source
Bertran and coauthors, “Halide Effects on Platinum Co-Catalysts Govern Photocatalytic Hydrogen Evolution in Organic Semiconductor Nanoparticles,” published online in ACS Energy Letters on September 29, 2026: https://pubs.acs.org/doi/10.1021/acsenergylett.6c02116.
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