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Search: WFRF:(Wirth Steffen)

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1.
  • Li, Guowei, et al. (author)
  • Dirac Nodal Arc Semimetal PtSn4: An Ideal Platform for Understanding Surface Properties and Catalysis for Hydrogen Evolution
  • 2019
  • In: Angewandte Chemie International Edition. - : WILEY-V C H VERLAG GMBH. - 1433-7851 .- 1521-3773.
  • Journal article (peer-reviewed)abstract
    • Conductivity, carrier mobility, and a suitable Gibbs free energy are important criteria that determine the performance of catalysts for a hydrogen evolution reaction (HER). However, it is a challenge to combine these factors into a single compound. Herein, we discover a superior electrocatalyst for a HER in the recently identified Dirac nodal arc semimetal PtSn4. The determined turnover frequency (TOF) for each active site of PtSn4 is 1.54 H-2 s(-1) at 100 mV. This sets a benchmark for HER catalysis on Pt-based noble metals and earth-abundant metal catalysts. We make use of the robust surface states of PtSn4 as their electrons can be transferred to the adsorbed hydrogen atoms in the catalytic process more efficiently. In addition, PtSn4 displays excellent chemical and electrochemical stabilities after long-term exposure in air and long-time HER stability tests.
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2.
  • Wirth, Steffen, et al. (author)
  • Informal institutions matter : professional culture and the development of biogas technology
  • 2013
  • In: Environmental Innovation and Societal Transitions. - : Elsevier. - 2210-4224 .- 2210-4232. ; 8, s. 20-41
  • Journal article (peer-reviewed)abstract
    • Institutions play a crucial role for the development and diffusion of novel technologies. Many studies have analyzed the role of formal institutions such as support policies or specific R&D programs, while informal institutions have received less attention. With this paper, we contribute to the institutional analysis of emerging technological fields as we examine how the effects of formal institutions depend on informal institutional structures. We present findings from a comparative study of biogas technology in selected Austrian regions. Our findings suggest that the professional culture in which farmers are embedded modulates the effects of feed-in tariffs and investment subsidies to a considerable extent. This explains regional differences in the diffusion as well as variations in the design and operation of biogas plants. We argue that studies on emerging technologies benefit from a systematic analysis of the interplay of regulative, normative and cultural-cognitive institutions. We also argue that socio-technical variation is an important indicator to look at in addition to diffusion rates.
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3.
  • 2019
  • Journal article (peer-reviewed)
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