Are there any electro-osmosis damp proofing systems that work?
There are two sides to an answer for your question you must consider.
First, it is important that you properly identify the type of damp. Rising damp should not be mistaken by penetrating damp or condensation damp. For clear description, please have a look here: https://www.wisepropertycare.com/services/rising-damp/what-is-rising-damp/signs/

Secondly, electro-osmosis works, as far as the physical processes behind it. It is therefore industry-accepted. I can send you a study made for one such product. Electro-osmosis is used in various dehydration processes, such as sludge dehydration by a Japanese company Kurita, proving its efficiency. 

It seems that negative reviews about this technology have two sources: one is wrong diagnosis of rising damp prior to instalation of electro-osmosis devices, and another is poor quality of the device or poor quality of its installation. Most electro-osmosis kits contain titanium anodes which must be drilled into the wall, which is handled unprofessionaly, weakens the end result. There are also completely non-intrusive devices on the market which are plugged into the socket and provide the same effect, i.e. repel water molecules from the walls and force them back into the soil. This French company provides such devices: http://build-innovation.com/en/

Hope this answer clarifies your doubt about electro-osmosis for rising damp.