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N-doped vertical graphene arrays/carbon quantum dots derived from vinegar residue as efficient water-splitting catalyst in a wide pH range

In order to develop water splitting as a sustainable technology, cost-effective and green electrocatalysts are urgently needed. We report a fabrication of an efficient self-supported whole-carbon electrocatalyst for overall water splitting in a wide pH range, which consist of nitrogen-doped vertically aligned graphene arrays and nitrogen-doped carbon quantum dots (N-VG-CQDs) prepared from vinegar residue. N-VG-CQDs electrocatalyst displays excellent electrocatalytic performances towards hydrogen evolution reaction (overpotentials of 218 and 238?mV in 1.0?M KOH and 0.5?M?H2SO4, respectively), as well as outstanding performances towards oxygen evolution reaction (overpotentials of 383 and 497?mV in 1.0?M KOH and 0.5?M?H2SO4, respectively). In addition, N-VG-CQDs acts as a self-supporting bifunctional electrocatalyst, exhibiting good stabilities in both acidic and alkaline electrolytes and an excellent Faraday efficiency (about 83 %). This study sheds light on the usage of vinegar residue towards the development of cost-effective whole-carbon electrocatalysts in water splitting. And the study also facilitates the use of environmental pollutions to prepare electrocatalysts for water splitting and advances the development of the water splitting industry.

» Author: Rong Liu, Yuchen Tian, Zijing Ren, Xiaolin Ren, Kaiming Guo, Haotian Sun, Firdoz Shaik, Bin Jiang

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