Switching Fuzzy Guaranteed Cost Control for Nonlinear Networked Control Systems

This paper deals with the problem of guaranteed cost control for a class of nonlinear networked control systems (NCSs) with time-varying delay. A guaranteed cost controller design method is proposed to achieve the desired control performance based on the switched T-S fuzzy model. The switching mechanism is introduced to handle the uncertainties of NCSs. Based on Lyapunov functional approach, some sufficient conditions for the existence of state feedback robust guaranteed cost controller are presented. Simulation results show that the proposed method is effective to guarantee system’s global asymptotic stability and quality of service (QoS)

Monolithic FAPbBr3 photoanode for photoelectrochemical water oxidation with low onset-potential and enhanced stability

Abstract Despite considerable research efforts on photoelectrochemical water splitting over the past decades, practical application faces challenges by the absence of efficient, stable, and scalable photoelectrodes. Herein, we report a metal-halide perovskite-based photoanode for photoelectrochemical water oxidation. With a planar structure using mesoporous carbon as a hole-conducting layer, the precious metal-free FAPbBr3 photovoltaic device achieves 9.2% solar-to-electrical power conversion efficiency and 1.4 V open-circuit voltage. The photovoltaic architecture successfully applies to build a monolithic photoanode with the FAPbBr3 absorber, carbon/graphite conductive protection layers, and NiFe catalyst layers for water oxidation. The photoanode delivers ultralow onset potential below 0 V versus the reversible hydrogen electrode and high applied bias photon-to-current efficiency of 8.5%. Stable operation exceeding 100 h under solar illumination by applying ultraviolet-filter protection. The photothermal investigation verifies the performance boost in perovskite photoanode by photothermal effect. This study is significant in guiding the development of photovoltaic material-based photoelectrodes for solar fuel applications

Remarkable Thermochromism in the Double Perovskite Cs2NaFeCl6

Lead-free halide double perovskites (HDPs) have emerged as a new generation of thermochromic materials. However, further materials development and mechanistic understanding are required. Here, a highly stable HDP Cs2NaFeCl6 single crystal is synthesized, and its remarkable and fully reversible thermochromism with a wide color variation from light-yellow to black over a temperature range of 10 to 423 K is investigated. First-principles, density functional theory (DFT)-based calculations indicate that the thermochromism in Cs2NaFeCl6 is an effect of electron–phonon coupling. The temperature sensitivity of the bandgap in Cs2NaFeCl6 is up to 2.52 meVK−1 based on the Varshni equation, which is significantly higher than that of lead halide perovskites and many conventional group-IV, III–V semiconductors. Meanwhile, this material shows excellent environmental, thermal, and thermochromic cycle stability. This work provides valuable insights into HDPs' thermochromism and sheds new light on developing efficient thermochromic materials.Funding agencies: This work was financially supported by the Knut and Alice Wallenberg Foundation (Dnr. KAW 2019.0082), the Swedish Energy Agency (2018-004357), Carl Tryggers Stiftelse, Olle Engkvist Byggmästare Stiftelse, and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009-00971). I.A.A. is a Wallenberg Scholar. B.B. gratefully acknowledges financial support from the Swedish Research Council (VR) grant no. 2021-00357. F.J. was supported by the China Scholarship Council (CSC). W.N. acknowledges the Suzhou Key Laboratory of Functional Nano &amp; Soft Materials, the Collaborative Innovation Center of Suzhou Nano Science &amp; Technology (NANO−CIC), and the 111 Project for the financial support. S.I.S. acknowledges the support from the Swedish Research Council (VR) (Project No. 2019–05551) and the ERC (synergy grant FASTCORR project 854843). The computations were enabled by resources provided by the National Academic Infrastructure for Supercomputing in Sweden (NAISS), the Swedish National Infrastructure for Computing (SNIC) at the National Supercomputer Center (NSC), and the Center for High Performance Computing (PDC), partially funded by the Swedish Research Council through Grant Agreements No. 2022–06725 and No. 2018–05973. F.W. gratefully acknowledges financial support from the Open Project Funding of Jiangsu Key Laboratory for Carbon-based Functional Materials &amp; Devices, Soochow University (KJS2152), and the Formas (2020-03001). M.M. acknowledges financial support from Swedish Energy Research (Grant no. 43606-1) and the Carl Tryggers Foundation (CTS20:272, CTS16:303, CTS14:310).</p