Modelling Non-Smooth Signals with Complex Spectral Structure

Bruinsma, Wessel P.; Tegnér, Martin; Turner, Richard E.

doi:10.48550/arxiv.2203.06997

Cited by 1 publication

(1 citation statement)

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“…Therefore, the GP used in standard BO might not capture abrupt transitions in a nonsmooth function. Designing GP for nonsmooth functions is still in development, − and there is no general and easy-to-implement guideline for fitting highly nonlinear functions by GP. As an easier-to-implement alternative to designing specific and potentially very complicated GP for this work, here, after iteration #3, we use a NN approach that is thought to have strong expressive power for nonlinear relations to help drive exploitations in high Z regions.…”

Section: Resultsmentioning

confidence: 99%

Bayesian-Optimization-Assisted Laser Reduction of Poly(acrylonitrile) for Electrochemical Applications

Patil¹,

Wan²,

Gong³

et al. 2023

ACS Nano

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Laser reduction of polymers has recently been explored to rapidly and inexpensively synthesize high-quality graphitic and carbonaceous materials. However, in past work, laser-induced graphene has been restricted to semiaromatic polymers and graphene oxide; in particular, poly(acrylonitrile) (PAN) is claimed to be a polymer that cannot be laser-reduced successfully to form electrochemically active material. In this work, three strategies to surmount this barrier are employed: (1) thermal stabilization of PAN to increase its sp 2 content for improved laser processability, (2) prelaser treatment microstructuring to reduce the effects of thermal stresses, and (3) Bayesian optimization to search the parameter space of laser processing to improve performance and discover morphologies. Based on these approaches, we successfully synthesize laser-reduced PAN with a low sheet resistance (6.5 Ω sq −1 ) in a single lasing step. The resulting materials are tested electrochemically, and their applicability as membrane electrodes for vanadium redox flow batteries is demonstrated. This work demonstrates electrodes that are processed in air, below 300 °C, which are cycled stably over 2 weeks at 40 mA cm −2 , motivating further development of laser reduction of porous polymers for membrane electrode applications such as RFBs.

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