Correction

dear: regrading the query: 1. we did have an update information about our reference. this paper is still in the in press format until now. 2. for the correspondence address, please refer to our letter about the request of changing the correspondence author. we put all information there 1. line 7. please change the address into: plasma-catalyst chemical process lab., korea institute of science and technology, republic of korea 2. line 162. i prefer to change the numbering of sub-heading 'sem,eds, and cu surface area' from 2.5 to 2.4.2. the reason is because this section is a part of catalyst characterization (2.4) so, it is better to put under the group of catalyst characterization section (2.4)