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A novel interfacial resistance-free (IRF) bifunctional camouflage (transparent and invisible) device is proposed in this paper. The thermal and electric conductivities of the shell and background are the same to eliminate the interfacial resistance. The IRF bifunctional camouflage device can operate in thermal–electric fields based on the neutral inclusion method. The distribution of isotherm and equipotential lines are studied quantitatively by the simulations. It is confirmed that the IRF bifunctional camouflage device with arbitrary natural materials can effectively achieve not only the invisible function but also the transparent function in thermal–electric fields. This method provides a window to the realization of bifunctions and the development of multi-physics fields. [ABSTRACT FROM AUTHOR]

For the electrolysis of aquatic hydrogen process efficiently in alkaline solution, the synthesis of high-activity and low-cost electrocatalyst are needed to reduce the high reaction energy barrier of HER. In this paper, a cost-effective MoS 2 /Cu 1.8 S/NiS@MoS X heterostructure catalyst was synthesized simply by a one-step hydrothermal method. In the preparation process, Cu mesh was used instead of traditional copper salts as a Cu source, enabling the spontaneous formation of Cu 1.8 S and NiS together on a large specific surface area MoS x substrate, which helps to accelerate the dissociation of H 2 O. The catalyst had an overpotential as low as 87 mV at 10 mA/cm2 and only 31 mV was increased after 1000 cycles of CV test in 1 M KOH solution. The characterization analysis showed that the heterogeneous structure of the catalyst contained a large amount of bridging S 2 2− and vacancy defects, which greatly promoted the catalyst stability and catalytic effect. • A heterostructure catalyst with excellent HER activity was synthesized. • The MoS 2 /Cu 1.8 S/NiS@MoS X catalyst was prepared using Cu mesh as a Cu source. • High synergism of Cu 1.8 S with NiS induces a large quantity of bridging S 2 2− active sites in MoS X. [ABSTRACT FROM AUTHOR]