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I haven't seen any donation address on the official website. Maybe there was before, I can't remember but this is what I've seen on the same question if there's a way to donate to electrum.
This is the exact thing that came out when I've searched. It asked and answered three years ago on reddit.
Electrum probably doesn't have revenue as part of its operational structure. As for donations, this was once the reply of the developer:
However, you you can donate to the people who run public Electrum servers.
Electrum does relies on servers, and we currently lack an effective way to reward the server operators.
they don't accept donations. instead they suggest donating to the electrum server you are connected to. you can do that via the help menu option.
Prolly, all of the servers and stuff are gonna run based on its community or otherwise if come short, from their own pockets.
That's too bad that they're working for free, in my opinion, they're the type of people that I won't mind paying for their services because they're doing what they're promising to do, they would've been making bank if they start some form of monetization but they choose to be our heroes, when I finally made a profit, I'll probably do what @ThomasV wanted us to do. I can't imagine myself running a server and having to spend my own money to run it without any profit, I salute this people, not all heroes wear capes.