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Issue 106, 2016, Issue in Progress
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Nitrogen- and sulfur-doped carbon nanoplatelets via thermal annealing of alkaline lignin with urea as efficient electrocatalysts for oxygen reduction reaction

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Abstract

Nowadays, the development of metal-free oxygen reduction reaction (ORR) catalysts based on heteroatom-doped carbon materials has become one of the most attractive topics in fuel cells. Here, we describe a green one-step pyrolysis method for the synthesis of N and S dual-doped carbon nanoplatelets by using alkaline lignin (AL) as the C and S sources combining with urea as a nitrogen dopant. After carbonization at 900 °C, such a hybrid material (N–S–C 900) possesses an excellent electrocatalytic activity towards ORR in both alkaline and acidic media, which is superior to the benchmark Pt/C catalyst in terms of the half-wave potential and diffusion-limiting current density in an alkaline medium. Meanwhile, the obtained hybrid also shows better stability and excellent methanol tolerance than the commercial Pt/C catalyst for ORR in both alkaline and acidic media. In particular, the N–S–C 900 has prominent operational stability in alkaline media, retaining 93.1% of the initial current density after 10 000 s. In this way, using natural biological resources provides a promising alternative to noble-metal catalysts.

Graphical abstract: Nitrogen- and sulfur-doped carbon nanoplatelets via thermal annealing of alkaline lignin with urea as efficient electrocatalysts for oxygen reduction reaction

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Article information


Submitted
01 Sep 2016
Accepted
26 Oct 2016
First published
26 Oct 2016

RSC Adv., 2016,6, 104183-104192
Article type
Paper

Nitrogen- and sulfur-doped carbon nanoplatelets via thermal annealing of alkaline lignin with urea as efficient electrocatalysts for oxygen reduction reaction

X. Zhang, D. Yu, Y. Zhang, W. Guo, X. Ma and X. He, RSC Adv., 2016, 6, 104183
DOI: 10.1039/C6RA21958F

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