,!The CIE colour rendering index (Ra) is the most widely used measure for quantifying and comparing the colour rendering performance of light sources. Despite its prominence Ra is not without limitations, including its reliance on reference standards and the inability to compare the Ra of sources with different correlated colour temperatures. Other colour rendering measures have been proposed including several based on colour preference, others based on absolute scales, and some that are graphical rather than numerical. This paper utilizes nine colour rendering indices to assess and compare the performance of common light sources and theoretical illuminants. Following this assessment, recommendations for the use of existing tools are made, as well as suggested strategies for future colour rendering measures.
Mass
production of ordered and porous three-dimensional (3D) electrodes
is a crucial prerequisite for practical energy storage devices. MXenes
have drawn considerable attention as pseudocapacitive materials for
outstanding electric conductivity and surface redox reactions; however,
they face challenges for achieving 3D porous architectures especially
at high mass loadings. Herein we propose a reduced-repulsion freeze-casting
assembly concept via interlayer interaction engineering for constructing
3D porous Ti3C2T
x
films, wherein interlayer repulsion is minimized via less electronegative
functional groups and charge screening effect based on quantum calculations.
3D Ti3C2T
x
films
deliver a capacitance of 207.9 F g–1 at 10 V s–1, which demonstrates 58.6% capacitance retention with
a 1000-fold scan rate increase. The capacitive performance is almost
independent of electrode mass loading up to 16.18 mg cm–2, exhibiting ultrahigh areal capacitance of 3731 mF cm–2 and energy density of 336.7 μWh cm–2.
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