1. Center for Phononics and Thermal Energy Science; School of Physics Science and Engineering; Tongji University; Shanghai 200092 P. R. China
2. State Key Laboratory of Coal Combustion; Huazhong University of Science and Technology (HUST); Wuhan 430074 P. R. China
3. Nano Interface Center for Energy (NICE); School of Energy and Power Engineering; Huazhong University of Science and Technology (HUST); Wuhan 430074 P. R. China
4. Department of Mechanical Engineering; University of Colorado; Boulder CO 80309 USA