Earth-abundant metal-free carbon-based electrocatalysts for Zn-air batteries to power electrochemical generation of H2O2 for in-situ wastewater treatment
Earth-abundant metal-free carbon-based electrocatalysts for Zn-air batteries to power electrochemical generation of H2O2 for in-situ wastewater treatment
复制标题
地球丰富的无金属碳基电催化剂，用于锌空气电池，为电化学产生 H2O2 提供动力，用于原位废水处理
DOI：
10.1016/j.cej.2020.128338
复制
发表时间：
2021-02-27
影响因子：
15.1
通讯作者：
Dai, Liming
中科院分区：
文献类型：
--
作者：
Wang, Kun;Dai, Quanbin;Dai, Liming
化石燃料的过度使用造成了严重的能源危机和环境污染。在这项研究中，我们合理地设计了一个集成系统，在该系统中，新的地球丰富的无金属碳基电催化剂被用来催化氧还原反应（ORR）在锌-空气电池可再生能源存储作为电源的电化学产生的H2 O2作为氧化剂的原位降解废水中的污染物。结果表明，新型有序介孔碳（OMC）和N掺杂介孔碳（NOMC）分别对2 e（-）ORR产生H2 O2和4 e（-）ORR在锌-空气电池阴极具有高选择性。OMC电极在0.5 V下2 h内的H2 O2产率高达366.9 mg/L，导致接近73.6%的高电流效率。随后将由此产生的H2 O2用于罗丹明B（RhB）候选污染物降解，在2 h内表现出90%的去除效率，显示出用于实际废水处理的巨大前景。这项工作代表了一个新的概念和新颖的集成系统，以解决当前的能源和环境变化的发展突破。
The overuse of fossil fuel has caused a serious energy crisis and environmental pollution. In this study, we rationally devised an integrated system, in which novel earth-abundant metal-free carbon-based electrocatalysts were used to catalyze oxygen reduction reaction (ORR) in Zn-air batteries for renewable energy storage as a power source for electrochemical generation of H2O2 as an oxidant for in-situ degradation of pollutants in wastewater. It was noted that the newly-developed ordered mesoporous carbon (OMC) and N-doped OMC (NOMC) exhibited high selectivity for 2e(-) ORR to produce H2O2 and high selectivity for 4e(-) ORR at the cathode of Zn-air batteries, respectively. The OMC electrode showed a H2O2 yield as high as 366.9 mg/L in 2 h at 0.5 V, leading to a high current efficiency similar to 73.6%, The subsequent use of thus-produced H2O2 for Rhodamine B (RhB) candidate pollutant degradation exhibited an 90% removal efficiency in 2 h, showing a great promise for practical wastewater treatment. This work represents a breakthrough in the development of a new concept and novel integrated systems to address the current energy and environmental changes.