Herein, we report the novel ability of electrospun polyacrylonitrile (PAN) nanofibrous membranes to convert low-mid frequency noise into electricity with high voltage outputs. The acoustoelectric device is prepared by sandwiching a thin PAN fibrous membrane between two metal-coated plastic film electrodes. Under 117 dB sound (frequency 100-500 Hz), the nanofiber device can generate peak electric outputs as high as 58 V and 12 mu A, with a maximum output power of 210.3 mu W (areal power density 17.53 mu W/cm(2)), which is much larger than that of other acoustoelectric devices reported. The electrical energy generated after rectification can be used to run commercial electronic devices (e.g., LEDs) directly. It can also be stored in a power bank and accumulated into larger power for further uses. Electrospun PAN may serve as a potential candidate to recycle sound noise, white pollution, into usable electric energy.