Black titanium dioxide, TiO_2-x, was obtained by hydrogenating commercial TiO₂ on nickel foam with radio frequency (RF) atmospheric pressure (AP) He/H₂ plasma in short-time (5, 15 and 30 min) at power of 180 W. Voltage and current waveform was used to characterize the RF discharge. Optical emission spectrum (OES) was employed to investigate the active species during the discharge. The field emission scanning electron microscope (FE-SEM) was employed to investigate the influence of the morphology change by plasma. TiO₂ nanoparticles of the hydrogenated samples protrude from the surface and are more clearly to be distinguished. The crystallization was characterized by X-ray diffraction (XRD). The X-ray photoelectron spectroscopy (XPS) results showed that TiO₂ turned into TiO_2-x with the Ti³⁺ species introduced by the plasma hydrogenation process. The hydrogenated samples presented significant visible light absorbance and narrow band gap, and displayed higher photocatalytic activity than the pristine samples in degrading methylene blue (MB) under xenon lamp irradiation.

黑色二氧化钛，TiO _{2- x}，是通过在短时间（5、15 和 30 分钟）下以射频 (RF) 大气压 (AP) He/H ₂等离子体在泡沫镍上氢化商业 TiO ₂获得的。 180 W。电压和电流波形用于表征射频放电。使用光发射光谱（OES）来研究放电过程中的活性物质。采用场发射扫描电子显微镜（FE-SEM）研究等离子体对形貌变化的影响。二氧化钛₂氢化样品的纳米颗粒从表面突出，更容易区分。通过X射线衍射(XRD)表征结晶。X射线光电子能谱(XPS)结果表明，TiO ₂转变为TiO _{2- x}，其中Ti ³⁺物种通过等离子体氢化过程引入。氢化样品表现出显着的可见光吸收和窄带隙，并且在氙灯照射下降解亚甲基蓝（MB）时表现出比原始样品更高的光催化活性。