為因應全球環保及低碳生活議題，開發新型可再生或替代能源已是未來產業趨勢，本研究致力於發展低成本、高效能之雙功能性催化觸媒材料，應用於氧氣還原反應 (oxygen reduction reaction, ORR) 和氧氣析出反應 (oxygen evolution reaction, OER)。燃料電池中陰極的氧氣反應為反應速率步驟，目前仍以貴金屬(如Pt, Ru)或其氧化物為主要觸媒，但其價格昂貴且資源有限。本研究使用水熱法，以硼酸 (H3BO3) 將硼摻雜在還原氧化石墨烯的同時，將氧化鈷擔載在此碳材上，成為CoOx/B-rGO複合材料。利用石墨烯的高表面積的特性有效分散氧化鈷，結合硼摻雜還原氧化石墨稀 (B-rGO) 所造成的正電荷缺陷，提升氧氣還原及氧氣析出反應活性。
　　由XRD分析結果顯示，本研究以水熱法製備之氧化鈷擔載於硼摻雜還原氧化石墨烯，同時具有四氧化三鈷(Co3O4)和氫氧化鈷(Co(OH)2)的氧化鈷結晶型態。比較不同觸媒，在0.1 M KOH中以1 mV/s掃描速率進行LSV電化學測試，CoOx/0.5M B-rGO在氧氣還原反應的起始電位為-0.112 V (vs. Ag/AgCl)，正於Co3O4和0.5M B-rGO；在氧氣析出反應的起始電位為-0.516 V(vs. Ag/AgCl)，負於Co3O4和0.5M B-rGO。硼摻雜能同時提升氧氣還原與氧氣析出活性。複合型觸媒會產生協同作用(synergistic effect)，氧化鈷與硼摻雜還原氧化石墨烯會共同提升電化學活性。比較氧化鈷擔載於各種硼量摻雜還原氧化石墨烯，由LSV測試結果顯示，在氧氣還原反應，CoOx/0.5M B-rGO具有最正的起始電位-0.112 V (vs. Ag/AgCl)；在氧氣析出反應，CoOx/1.5M B-rGO具有最負的起始電位0.505 V (vs. Ag/AgCl)。
　　氧化鈷擔載於各種硼量摻雜還原氧化石墨烯在熱處理後，所有複合型觸媒的氧氣還原反應活性皆下降，而CoOx/0.5M B-rGO的氧氣析出活性反而提高，有最負的起始電位0.479 V (vs. Ag/AgCl)，由XRD分析圖發現Co(OH)2繞射峰消失，推測熱處理會破壞氫氧化鈷結構，造成電化學活性提升或下降。

The cobalt oxide on boron doped reduced graphite oxide (CoOx/B-rGO) was simultaneously synthesized by hydrothermal method in the presence of boric acid. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed that the composite includes both Co3O4 and Co(OH)2 crystalline structure. The X-ray photoelectron spectroscopy (XPS) analysis demonstrated the boron atoms were successfully doped into reduced graphite oxide structure. In 0.1 M KOH electrolyte, the composite showed a more positive onset potential at -0.112 V for oxygen reduction reaction (ORR) and a more negative onset potential at -0.516 V for oxygen evolution reaction (OER) than either Co3O4 or boron doped reduced graphite oxide (B-rGO). Due to synergetic effect and unique boron doping active sites, CoOx/B-rGO was a high-performance non-precious bifunctional catalyst for both ORR and OER.

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