Ultrashort-pulse laser structured titanium surfaces with sputter-coated platinum catalyst as hydrogen evolution electrodes for alkaline water electrolysis

Gabler, Andreas; Müller, Christian I.; Rauscher, T.; Gimpel, Thomas; Hahn, Robert W.; Köhring, Michael; Kieback, Bernd; Röntzsch, Lars; Schade, Wolfgang

doi:10.1016/j.ijhydene.2018.02.130

Cited by 34 publications

(23 citation statements)

References 49 publications

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“…It must be noted, that BET measurements usually reveal a larger surface area, which can be explained by a porosity not recognized by the LSM. [47] Figure 4a visualizes the homogeneity of the microconical structure on larger areas. We found samples of 2 × 2 cm 2 to be processed without any problems.…”

Section: Resultsmentioning

confidence: 99%

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From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation

Rauh

Wöbbeking

et al. 2020

ChemPhysChem

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A conical microstructure is one of the most versatile surface textures obtained by ultrashort laser micromachining. Besides an increased surface area, unique surface properties such as superhydrophilicity, increased absorptivity; and thermal emissivity can be tailored. On metals, usually ultrashort laser pulses in the femtosecond to low picosecond range are used to obtain these surface structures, whereas nanosecond laser pulses favor melting processes. Herein, we report on an investigation of reactive gas atmospheres such as oxygen, steam, and halogens during laser micromachining of aluminum with 6 ns laser pulses. At a reduced pressure of 20 hPa (air) with additional iodine vapor as reactive species, we found a perfectly microconical structured surface to be formed with nanosecond laser pulses. The resulting surface structures were proven to be free of residual halogens. The application of nanosecond instead of femtosecond laser pulses for the surface structuring process allows to apply significantly less complex laser sources.

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Section: Resultsmentioning

confidence: 99%

“…For comparison, samples have been processed with a Ti:sapphire laser source with t = 60 fs laser pulses at a wavelength of 800 nm according to a setup reported previously. [47] Samples treated with τ = 2 ns pulses from a fiber laser at ambient air have been obtained from Trotec.…”

Section: Methodsmentioning

confidence: 99%

From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation

Rauh

Wöbbeking

et al. 2020

ChemPhysChem

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“…15a, c-h. In one example, Ma et al [235] synthesized a catalyst composed of Pt-based nanoparticles supported on bamboo-like CNTs which demonstrated a high catalytic property (with an overpotential of 40 mV and a Tafel slope of 33 mV dec −1 ) that was near the activity of commercially available 20 wt% Pt/C.…”

Section: Noble Metal Catalystsmentioning

confidence: 99%

Recent Progresses in Electrocatalysts for Water Electrolysis

Khan

Zhao

Zou

et al. 2018

Electrochem. Energ. Rev.

335

178

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The study of hydrogen evolution reaction and oxygen evolution reaction electrocatalysts for water electrolysis is a developing field in which noble metal-based materials are commonly used. However, the associated high cost and low abundance of noble metals limit their practical application. Non-noble metal catalysts, aside from being inexpensive, highly abundant and environmental friendly, can possess high electrical conductivity, good structural tunability and comparable electrocatalytic performances to state-of-the-art noble metals, particularly in alkaline media, making them desirable candidates to reduce or replace noble metals as promising electrocatalysts for water electrolysis. This article will review and provide an overview of the fundamental knowledge related to water electrolysis with a focus on the development and progress of non-noble metal-based electrocatalysts in alkaline, polymer exchange membrane and solid oxide electrolysis. A critical analysis of the various catalysts currently available is also provided with discussions on current challenges and future perspectives. In addition, to facilitate future research and development, several possible research directions to overcome these challenges are provided in this article.

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“…Surface enlargement and surface microstructuring leads to unique material properties such as superhydrophilicity and superhydrophobicity, [1][2][3][4][5] increased absorptivity ("black metals"), 1,6-9 emissivity, 10,11 enhanced or reduced adhesion for biomedical and mechanical applications, [12][13][14][15][16] and improvements of electrodes and heterogeneous catalysts. [17][18][19][20] Recent reviews summarize the progress of laser femtosecond microstructuring. 1,21 Conical microstructures are of special interest as they can provide huge surface areas, minimize cell adhesion, act as light traps, and various other features.…”

Section: Introductionmentioning

confidence: 99%