File Name : s1.tif

Caption : figure s1. (a) ru@rgo/cnt-3/0, (b) ru@rgo/cnt-2/1, (c) ru@rgo/cnt-2/1, (d) ru@rgo/cnt-0/3 sem images.

File Name : s2.tif

Caption : figure s2. (a) particle size distribution diagram and tem, (b) post-test tem images together with an updated particle-size distribution of ru@rgo/cnt-1/2.

File Name : s3.tif

Caption : figure s3. (a-c) lsv curves of ru@rgo/cnt-3/0, ru@rgo/cnt-2/1, and ru@rgo/cnt-0/3 catalysts. (d) lsv curves of ru@rgo/cnt-x/y catalysts at a rotation speed of 1600 rpm.

File Name : s4.tif

Caption : figure s4. (a-c) cv curves of ru@rgo/cnt-3/0, ru@rgo/cnt-2/1, and ru@rgo/cnt-0/3 at scan rates ranging from 20 to 100 mv s-1.

File Name : s5.tif

Caption : figure s5. (a) sem image of ru@rgo/cnt-1, (b) sem image of ru@rgo/cnt-2, (c) sem image of ru@rgo/cnt-3, (d) sem image of ru@rgo/cnt-4.

File Name : s6.tif

Caption : figure s6. xps survey spectrum of ru@rgo/cnt-3.

File Name : s7.tif

Caption : figure s7. cv curves of ru@rgo/cnt-x

File Name : s8.tif

Caption : figure s8. (a-c) lsv curves of ru@rgo/cnt-1, ru@rgo/cnt-2, and ru@rgo/cnt-4 catalysts, (d) the lsv curves at a rotating speed of 1600 rpm

File Name : s9.tif

Caption : figure s9. (a-c) cv curves of ru@rgo/cnt-1, ru@rgo/cnt-2, and ru@rgo/cnt-4 at scan rates ranging from 20 to 100 mv s-1.

File Name : s10.tif

Caption : s10

File Name : s11.tif

Caption : s11