About the Authors

Yong Nie

Affiliation Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing

Yue-Qin Tang

Affiliation Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing

Yan Li

Affiliation Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing

Chang-Qiao Chi

Affiliation Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing

Man Cai

Affiliation Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing

Xiao-Lei Wu

xiaolei_wu@pku.edu.cn

Affiliation Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YN YQT XLW. Performed the experiments: YL CQC MC. Analyzed the data: YN XLW. Wrote the paper: YN XLW.