Abstract
Nickel metal hydride (NiMH) batteries are one type of batteries which are widely used commercially for various applications. NiMH consists of nickel hydroxide (Ni(OH)2) as a cathode electrode and lanthanum (La) alloy as an anode electrode. Many recent studies focused on developing the storage capacity, the self-discharge, and the degradation of performance at high temperature since they are cheaper than that of lithium-ion batteries. In this work, we’ve integrated the sunlight conversion and the storage abilities of NiMH. Ni(OH)2 as a cathode is a semiconductor material that can generate photovoltaic effect under the light which could facilitate electron transportation for electrochemical processes. The NiMH battery was fabricated as a coin-cell type with a transparent window to allow light passing toward Ni(OH)2. The NiMH battery was investigated via cyclic voltammogram (CV) and galvanostatic charge/discharge (GCD). In situ X-ray absorption spectroscopy (XAS) was also measured to elucidate the charge storage mechanisms. The result suggests the storage capacity enhancement under light illumination that could be one of the approaches for the development of NiMH batteries. Figure 1
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