Reddit mentions of Super Zero: Zinc Alloy (Graphic Sparks)

When my eldest son was 11 he loved these ones:

The Deep by Tom Taylor & James Brouwer

http://www.gestaltcomics.com/all-products/graphic-novels/the-deep-here-be-dragons/

Leave it to Chance by James Robinson and Paul Smith

http://www.amazon.com/Leave-It-To-Chance-Vol/dp/1582402531

MarineMan by Ian Churchill

http://www.amazon.com/Marineman-Matter-Life-Depth-TP/dp/1607063999/ref=sr_1_1?s=books&ie=UTF8&qid=1444192453&sr=1-1&keywords=marineman

Tellos by Todd Dezago and Mike Weiringo

http://www.amazon.com/Tellos-Colossal-Todd-Dezago/dp/1582407894/ref=sr_1_1?s=books&ie=UTF8&qid=1444192494&sr=1-1&keywords=tellos

Zinc Alloy by Donald Lemke and Douglas Holgate

http://www.amazon.com/Super-Zero-Alloy-Graphic-Sparks/dp/1434208583/ref=sr_1_3?s=books&ie=UTF8&qid=1444192588&sr=1-3&keywords=zinc+alloy

Zinc Alloy may skew a bit younger than 11 though.

Alongside the already mentioned Bone, Atomic Robo,