Hello Rose ,
I think the second pattern is rather correct.
努力 is more of a verb meaning 'try hard' .
你努力学习中文吗?我努力了。
You tried learning Chinese hard? I tried
This makes sense .
Other examples:
他不努力工作 ( ta bu nuli gongzuo )= He doesn't work hard.
我会尽最大努力 ( wo hui jin zui da nuli )= I'll try my very best.