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ilei Xie Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, Dongguan University of Technology, Dongguan 523808, People’s Republic of China

Yongfu Qiu Dongguan Cleaner Production Center, School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, People’s Republic of China; and Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, Dongguan University of Technology, Dongguan 523808, People’s Republic of China

Yuanqi Jiao, Chuanwei Ji, and Yangping Li Dongguan Cleaner Production Center, School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, People’s Republic of China

Hongbo Fanb) Dongguan Cleaner Production Center, School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, People’s Republic of China; and Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, Dongguan University of Technology, Dongguan 523808, People’s Republic of China

Xihong Lu MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China (Received 30 September 2017; accepted 6 November 2017)

Porous carbon nanomaterials with significant capacitive performance were successfully prepared through a simple two-step process of thermal-polymerization and carbonization without an additional template. As a result, the as-prepared porous carbon nanomaterials of sample-A and sample-B exhibited an amorphous phase with low graphitization. And sample-A showed a moderate specific surface area of 476.39 m2/g, larger than that of sample-B (280.94 m2/g). The relatively high mass specific capacitance of 205.1 F/g at a scan rate of 5 mV/s and 211 F/g at a current density of 4 A/g was obtained by sample-A, which are higher than those of sample-B (82.6 F/g at 5 mV/s and 78.6 F/g at 4 A/g). Sample-A also showed excellent conductivity and superior cyclic stability with 94.19% capacitance retention after 5000 cycles, which are also higher than those of sample-B. This work proposed a cost-effective, green, and promising strategy for the large-scale preparation of porous carbon nanomaterial electrodes.

I. INTRODUCTION

With the increasing energy demand, it is urgent to develop renewable energy technology to replace traditional fossil energy sources for resisting the worst influence of the climate warming and environment pollution. For energy storage devices, supercapacitors and Li-ion batteries are of

Contributing Editor: Teng Zhai Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2017.447

great attention in the past decades. In the energy renewable materials, porous materials play a very important role in the materials field due to the majority phases, either with random character (disordered pore systems) or with high regularity (ordered pore systems).1 Among them, or