A two-photon tandem absorption E-BiVO 4 /BPQDs/OL-OEC photoanode with superior light absorbability and photocurrent density.

Correction for ‘Two-terminal DSSC/silicon tandem solar cells exceeding 18% efficiency’ by Jeong Kwon <italic>et al.</italic>, <italic>Energy Environ. Sci.</italic>, 2016, DOI: 10.1039/c6ee02296k.

A highly-efficient DSSC/Si monolithic tandem cell utilizing PEDOT:FTS as an interfacial catalytic layer.

Order/disorder interfacial engineering realizes highly efficient co-catalyst free hydrogen generation.

We report a dry fabrication strategy for carbon-based electrodes in perovskite solar cells (PSCs), using ozone-treated multiwalled carbon nanotubes (O-MWCNTs) and polytetrafluoroethylene (PTFE) fibrillation. The resulting dry-processed O-MWCNT/PTFE composite carbon electrode (OP-DPCE) exhibits high conductivity, improved interfacial contact, and stable mechanical stability. PSCs incorporating OP-DPCE achieve a power conversion efficiency of 24.84%, corresponding to ∼95% of that of Au-based PSCs. This efficiency gap arises primarily from reduced internal reflection, while hole extraction efficiency remains nearly identical to that of gold electrodes, as confirmed by photophysical and electrochemical analyses. The OP-DPCE retains 100% of its initial efficiency under 1.2 sun maximum power point tracking for 1000 h and exhibits outstanding thermal stability at 100 °C. These results demonstrate that OP-DPCE combines efficient charge transport with exceptional long-term durability. This work establishes a scalable, solvent-free approach to fabricating robust carbon electrodes, offering a promising alternative to noble metals in stable, high-performance PSCs.

Stable Fuel Cells In article number 2504059, Hanuel Jin, Hyesung Jo, Yongsoo Yang, Dong Won Chun, Sung Jong Yoo, and co-workers present the synthesis of dome-hollow NiPt nanocatalysts incorporating ordered Ni3Pt5 phases via ultrasound-assisted atomic transposition at room temperature. Atomic ordering within multi-grained structure effectively suppresses metal dissolution in chemical and electrochemical environments, enabling high catalytic activity and long-term durability in PEMFCs under both light-duty and heavy-duty operations.

Selective C-H activation is the most important step for organic molecule transformation. Photocatalytic radicals driven C-H activation is considered a promising route but suffers from simultaneously utilizing electron/hole pairs which are limited to broad-band gap semiconductors. Herein, a half-photocathodic reaction strategy is demonstrated to activate and oxygenate C(sp³)-H bonds of toluene toward selective benzaldehyde production using a narrow-bandgap CuBi₂O₄ (CBO) porous photocathode. The intrinsic Cu⁺/Cu²⁺ redox of porous CBO photocathode catalyzes the photocathodic oxygen reductive H₂O₂ to generate ·OH capable of oxidation which activates the C(sp³)-H bond that is further oxygenated via ·O₂ ^- formed of the photocathodic oxygen reduction. As a result, the benzaldehyde selectivity is up to 90%. Impressively, the narrow-band gap of CBO enables record-high light-driven benzaldehyde yields of 111.93 mmol m^-2 h^-1 with stability of over 20 h. This work opens a green and efficient light-driven C(sp³)-H bond oxidation strategy by using a narrow-bandgap photocathode.

Rational design of catalytic nanomaterials is essential for developing high-performance fuel cell catalysts. However, structural degradation and elemental dissolution during operation pose significant challenges to achieving long-term stability. Herein, the development of multi-grained NiPt nanocatalysts featuring an atomically ordered Ni₃Pt₅ phase within intragrain is reported. Ultrasound-assisted synthesis facilitates atomic transposition by supplying sufficient diffusion energy along grain boundaries, enabling unprecedented phase formation. The Ni₃Pt₅ embedded nanocatalysts exhibit outstanding proton exchange membrane fuel cell performance under both light-duty and heavy-duty vehicle conditions, with significantly reduced Ni dissolution. Under light-duty vehicle conditions, the catalyst achieves a mass activity of 0.94 A mg_Pt ^-1 and a 421 mA cm^-2 current density (@ 0.8 V in air), retaining 78% of its initial mass activity after long-term operation. Under heavy-duty vehicle conditions, the multi-grained nanocrystal demonstrates only an 8% decrease in Pt utilization, a 5% power loss, and a 13 mV voltage drop, surpassing U.S. Department of Energy (DOE) durability targets. This study underscores the critical role of the atomically ordered Ni₃Pt₅ phase in stabilizing multi-grained NiPt nanocrystals, enhancing both durability and catalytic activity. These findings establish Ni₃Pt₅ embedded nanocatalysts as promising candidate for next-generation PEMFC applications, addressing key challenges in long-term operation.

A two-photon tandem absorption E-BiVO 4 /BPQDs/OL-OEC photoanode with superior light absorbability and photocurrent density.

Correction for ‘Two-terminal DSSC/silicon tandem solar cells exceeding 18% efficiency’ by Jeong Kwon <italic>et al.</italic>, <italic>Energy Environ. Sci.</italic>, 2016, DOI: 10.1039/c6ee02296k.

A highly-efficient DSSC/Si monolithic tandem cell utilizing PEDOT:FTS as an interfacial catalytic layer.