Tetrahedral NiS2/NiSe2 heterocages with rich‐phase boundaries are synthesized through a simultaneous sulfuration/selenylation process using Ni‐based acetate hydroxide prisms as precursor. Such a nanocage‐like NiS2/NiSe2 heterostructure can expose more active sites, accelerate the mass transport of the ions/gas, and optimize the interfacial electronic structure, which shows a significantly lower overpotential of 290 mV at 20 mA cm−2 than those of NiS/NiS2 and NiSe2 as counterparts. The experimental characterizations and theoretical density functional theory (DFT) calculations unveil that the interfacial electron transfer from NiSe2 to NiS2 at the heterointerface can modulate the electronic structure of NiS2/NiSe2, which further cooperates synergistically to change the Gibbs free energy of oxygen‐containing intermediates as the rate‐determining step (RDS) from 2.16 eV (NiSe2) and 2.10 eV (NiS2) to 1.86 eV (NiS2/NiSe2 heterostructures) during the oxygen evolution reaction (OER) process. And as a result, tetrahedral NiS2/NiSe2 heterocages with dual‐phase synergy efficiently trigger the OER process, and accelerate the OER kinetics. This work provides insights into the roles of the interfacial electron transfer in electrocatalysis, and can be an admirable strategy to modulate the electronic structure for developing highly active electrocatalysts.
Mobile manipulation robots have high potential to support rescue forces in disaster-response missions. Despite the difficulties imposed by real-world scenarios, robots are promising to perform mission tasks from a safe distance. In the CENTAURO project, we developed a disaster-response system which consists of the highly flexible Centauro robot and suitable control interfaces including an immersive telepresence suit and support-operator controls on different levels of autonomy.In this article, we give an overview of the final CENTAURO system. In particular, we explain several highlevel design decisions and how those were derived from requirements and extensive experience of Kerntechnische Hilfsdienst GmbH, Karlsruhe, Germany (KHG) 1 . We focus on components which were recently integrated and report about a systematic evaluation which demonstrated system capabilities and revealed valuable insights.
The dual-phase synergy between CoP and MoO2 and the modulated electronic structure induced by heterointerfacial charge redistribution lead to enhanced H2O dissociation and optimized H-adsorption free energy, accelerating the HER in alkaline and acidic solutions.
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