Paint Can Power Plant {gasification stove, steam turbine, dynamo, batteries}
The picture does not seem to be linked to the video, but I believe that the skewed rotor thing is something that claims to "increase efficiency." More conventional designs can already exceed 95%. In the video that I saw previously, the claims were pretty vague, but I suspect this is an attempt to exceed 100% efficiency, in other words, create energy from nothing -- impossible.

A permanent magnet DC motor with a commutator is the easiest type to use as a generator. Cars use PM DC motors for various functions such as electric radiator fans, heat/AC fans, windshield wipers etc. Some have gear heads that prevent each access to the motor shaft, but others should be reasonably easy to use. Since you can probably not control the turbine speed very easily, you need an electronic voltage converter that can convert the variable voltage to a constant charger voltage. Rather than dump the power after charging is complete, just turn the charger off.

You need to start by figuring out what kind of turbine you can build and what speed and torque it will produce. Then look for a motor that either matches that directly or can be matched with a simple belt and pulley system. Determine what the voltage range and current capability will be. Then determine what voltage conversion is needed for your loads.

For best results when operating as a generator, the motor speed should be the same as when it is operated as a motor. The voltage produced will be about the same, or proportional to speed if the speed varies. The generating current capability will be about the current the motor required.