1 School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, China.
2 Ballard Power Systems, Burnaby, BC, Canada.
3 School of Chemistry, University of New South Wales, Sydney, NSW, Australia.
4 Hydrogen Energy and Sonochemistry Research Group, Department of Energy and Process Engineering, Faculty of Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
5 School of Chemistry and Materials Engineering, Huizhou University, Huizhou, China.