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Uniform and porous ultrathin-carbon-coated pyrite (FeS2@C) nanooctahedra have been fabricated via a facile solvothermal method with subsequent carbon-coating-annealing and acid-pickling steps. Benefitting from their high conductivity, short Na+ diffusion distance, large surface area, and robust structure stability, the FeS2@C electrodes delivered a high specific capacity, excellent rate capability and superiorly stable cycling performance, suggesting a potential application in advanced sodium ion batteries.

Face recognition is one of the most studied research topics in the community. In recent years, the research on face recognition has shifted to using 3D facial surfaces, as more discriminating features can be represented by the 3D geometric information. This survey focuses on reviewing the 3D face recognition techniques developed in the past ten years which are generally categorized into conventional methods and deep learning methods. The categorized techniques are evaluated using detailed descriptions of the representative works. The advantages and disadvantages of the techniques are summarized in terms of accuracy, complexity and robustness to face variation (expression, pose and occlusions, etc). The main contribution of this survey is that it comprehensively covers both conventional methods and deep learning methods on 3D face recognition. In addition, a review of available 3D face databases is provided, along with the discussion of future research challenges and directions.