A novel carbon black graphite hybrid air-cathode for efficient hydrogen peroxide production in bioelectrochemical systems
A novel carbon black graphite hybrid air-cathode for efficient hydrogen peroxide production in bioelectrochemical systems
复制标题
一种新型炭黑石墨混合空气阴极，用于在生物电化学系统中高效生产过氧化氢
DOI：
10.1016/j.jpowsour.2015.12.078
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发表时间：
2016-02-29
影响因子：
9.2
通讯作者：
Wang, Xin
中科院分区：
文献类型：
--
作者：
Li, Nan;An, Jingkun;Wang, Xin
炭黑和石墨混合空气阴极被证明是生物电化学体系中产生H_2O_2的有效方法。最佳炭黑与石墨的质量比为1：5，最大过氧化氢产率为11.9 mg L·h~(-1)·cm~(-2)(123 mA·cm~(-2))。由于避免了H_2O_2的积累，连续流动可以提高电流效率。在生物系统中，H_2O_2的最高产率达到3.29 mg L~(-1)h(-1)(0.079 kg m~(-3)d(~(-1)，电流效率为72%，高于相同电流密度下的非生物系统。在该系统中产生的过氧化氢主要来自通过空气阴极扩散的氧气(>；66%)，特别是当施加更负的阴极电位时(在-1.0V时为94%)。这种混合式空气阴极具有H_2O_2产率高、电流密度大、不需要曝气等优点，使H_2O_2的合成更加高效和经济。(C)2015爱思唯尔B.V.保留所有权利。
Carbon black and graphite hybrid air-cathode is proved to be effective for H2O2 production in bioelectrochemical systems. The optimal mass ratio of carbon black to graphite is 1:5 with the highest H2O2 yield of 11.9 mg L-1 h(-1) cm(-2) (123 mA cm(-2)). Continuous flow is found to improve the current efficiency due to the avoidance of H2O2 accumulation. In the biological system, the highest H2O2 yield reaches 3.29 mg L-1 h(-1) (0.079 kg m(-3) day(-1)) with a current efficiency of 72%, which is higher than the abiotic system at the same current density. H2O2 produced in this system is mainly from the oxygen diffused through this air-cathode (>66%), especially when a more negative cathode potential is applied (94% at -1.0 V). This hybrid air-cathode has advantages of high H2O2 yield, high current density and no need of aeration, which make the synthesis of H2O2 more efficient and economical. (C) 2015 Elsevier B.V. All rights reserved.