氧化石墨烯片由石墨薄片合成藉由改良的Hummers法，氧化石墨稀分別與氮和硼混合，然後在180℃下水熱反應12小時。
熱差分析曲線表明，與rGO相比，NG，BG和BNG的碳分解溫度轉移到更高的溫度。比較三種電極系統下的電化學數據，NG，BG，BNG和GO在1M NaCl溶液中的CV電容分別為303,262,225和153 F/g。 NG的比電容值比其他的還要高。因此，acid-CNHox使用與NG相同的程序並與N-CNH反應。熱差分析曲線顯示acid-CNHox和N-CNH的碳分解溫度具有相同的溫度。比較5 mV/s時的CV電容，acid-CNHox和N-CNH分別為219和248 F/g。為了進一步研究NG和N-CNH，充電/放電顯示在1M NaCl溶液中0.8 A/g的比電容分別為128和95 F/g。為了進一步確認結果，NG和N-CNH的比電容由於物理結構，含氮和化學結構而受到影響。此外，在5000次循環後，NG和N-CNH的電容保持率仍分別保持97.9％和98.7％。

Graphene oxide sheets were synthesized from graphite flake by the modified Hummers method and it was doped by nitrogen, boron and both of them by mixing with nitrogen, boron and both of them, respectively and then used hydrothermal method at 180℃ for 12h.
The DTA curve showed that the carbon decomposition temperature of nitrogen-, boron- and boron/nitrogen-doping graphene (NG, BG and BNG) are shifted to more high temperature comparing with rGO. Comparing the electrochemical data under three electrodes system, the Cyclic voltammetry (CV) capacitance of NG, BG, BNG and GO at 5 mV/s in 1M NaCl solution were 303, 262, 225 and 153 F/g, respectively. The specific capacitance of NG was higher than others. Therefore, (acid treated carbon nanohorns) acid-CNHox was synthesized and (N-doped carbon nanohorns) N-CNH was prepared by using same procedure with NG. The DTA curve displayed that the carbon decomposition temperature of acid-CNHox and N-CNH have same temperature. Comparing CV capacitance at 5 mV/s, acid-CNHox and N-CNH were 219 and 248 F/g, respectively. To further investigate NG and N-CNH, galvanostatic charge/discharge showed the specific capacitance of 128 and 95 F/g, respectively, at 0.8 A/g in 1M NaCl solution. The specific capacitance of NG and N-CNH were influenced by the surface area, nitrogen-containing and chemical structure (pyridinic-N, pyrrolic-N and quaternary-N moieties). Furthermore, after 5000 cycles, the capacitance retention of NG and N-CNH still retained 97.9% and 98.7% respectively.

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