Ni ₃ S ₂ /Co ₃ S ₄ -Sv is prepared as an electrode material of Ni–Zn battery and supercapacitors. It displays lowered OH ⁻ adsorption energy and high DOS value due to combined effect of the heterostructure and sulfur vacancies as reflected from DFT results.

Aqueous ammonium ion batteries are promising because of their high safety and efficient charge transfer rate in energy storage applications, but their wide applicability is hindered by the limited properties of the cathode materials. Heterojunction engineering and ion doping are effective strategies for enhancing the reaction dynamics and structural stability of cathode materials. In this work, we chose an iron-doped heterogeneous structured VO₂(B)/V₃O₅ with a rich heterojunction interface and stability as a research object to test its application in ammonium ion storage. Ex situ XRD and ex situ FTIR tests proved that a phase transition happened during the first charge/discharge process. DFT calculations revealed that iron ion doping can adjust the electronic band structure and promote the phase transition by inducing fast catalytic coupling and NH₄ ⁺ insertion process. Impressively, Fe-VO₂(B)/V₃O₅ delivered superior electrochemical performance with high capacity and cycling stability when the atomic content of Fe was 0.1. The assembled Fe_0.1VO₂(B)/V₃O₅//PTCDI full cell exhibited a high capacity of 143.8 mA h g⁻¹ at 0.5 A g⁻¹ and energy density of 115.1 W h kg⁻¹ and behaved much better than other full cells with different Fe doping content. This work provides a new strategy to design a high-performance electrode material for ammonium ion storage through heterojunction engineering and ion doping.

Supported Pt-based catalysts have been identified as highly selective catalysts for CO oxidation, but their potential for applications has been hampered by the high cost and scarcity of Pt metals as well as aggregation problems at relatively high temperatures. In this work, nanorod structured (TiO₂−Pt)/CeO₂ catalysts with the addition of 0.3 at% Pt and different atomic ratios of Ti were prepared through a combined dealloying and calcination method. XRD, XPS, SEM, TEM, and STEM measurements were used to confirm the phase composition, surface morphology, and structure of synthesized samples. After calcination treatment, Pt nanoparticles were semi-inlayed on the surface of the CeO₂ nanorod, and TiO₂ was highly dispersed into the catalyst system, resulting in the formation of (TiO₂−Pt)/CeO₂ with high specific surface area and large pore volume. The unique structure can provide more reaction path and active sites for catalytic CO oxidation, thus contributing to the generation of catalysts with high catalytic activity. The outstanding catalytic performance is ascribed to the stable structure and proper TiO₂ doping as well as the combined effect of Pt, TiO₂, and CeO₂. The research results are of importance for further development of high catalytic performance nanoporous catalytic materials.

Following publication, concerns were raised regarding the peer-review process related to the publication of this article