A couple of comments about the CD4047. The CD family is nice in that it takes up to 18 V supply (the CD4047B shows a 20-V rating). The downside is that its fan-out for logic devices (number of devices it can feed) is low. The datasheet says just 2, and the current is also low, about 1 to 2 mA for the logic devices. For the CD4047B from TI, the max output is listed at 6.8 mA at 15V. The HEF family (e.g., HEF 4047) can also take supplies of up to 18V and provides at least 10 mA per output. It is not an expensive chip either. Digikey sells the chip for $0.50 USD, but has a minimum.
You can power a mosfet from the HEF family directly. You might be able to use the CD4047 directly too, but I have not tried that. If you are using a 5V supply, then you need a logic level mosfet. If you use a 12V supply, you can power a regular mosfet. I would be a little cautious powering more than one mosfet with either, particularly the CD4047. Finally, if you are going to be working at 5V, then there are other logic families available that will give you up to 20 mA per pin output. Neither chip compares favorably to dedicated mosfet drives for mosfets with large gate capacitances.
In summary, the CD4047B might work for driving a mosfet directly, but I would prefer to use the HEF 4047 at 12 V and another logic family, if at 5 V. John