Rechargeable Photoactive Zn‐Air Batteries Using NiCo2S4 as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode,Batteries & Supercaps

当前位置： X-MOL 学术 › Batteries Supercaps › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Rechargeable Photoactive Zn‐Air Batteries Using NiCo2S4 as an Efficient Bifunctional Photocatalyst towards OER/ORR at the Cathode
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-03 , DOI: 10.1002/batt.201900205
Sangchai Sarawutanukul _{1,

2} , Chanikarn Tomon _{1,

2} , Salatan Duangdangchote _{1,

2} , Nutthaphon Phattharasupakun _{1,

2} , Montree Sawangphruk _{1,

2}

Affiliation

Using free solar energy in oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) electrocatalysts to enhance the efficiency of zinc‐air batteries (ZABs) has not yet been widely investigated. Herein, we report a photoactive bifunctional catalyst of spinel‐type NiCo₂S₄ (NCS) urchin‐like structure with rich mesopores and direct band gap energies of ca. 1.4 and 2.4 eV. The NCS catalyst exhibits high catalytic activities for both OER (ɳ =338 mV at 10 mA cm⁻²) and ORR (ɳ =475 mV at E _1/2), comparable to that of the state‐of‐the‐art counterparts (e. g., Pt/C for ORR, RuO₂ for OER). Under light illumination, the p‐type photoactive NCS catalyst can absorb visible light, generating photogenerated holes and photoelectrons via the photoelectric effect for direct conversion of photoenergy into electric energy with increasing kinetics charge transfer process and provides ca. 10 and 18.5 % lower OER and ORR overpotentials, respectively than those under the dark condition. In addition, the as‐fabricated zinc‐air battery with the photoactive NCS as the cathode exhibits decrease in voltage gap from 0.82 to 0.60 V with an increasing round‐trip efficiency from 59.2 % to 68.8 % after exposed to visible light. The zinc‐air battery with a reversible redox reaction for the simultaneous conversion of chemical and photoenergy into electric energy could open a new pathway for the utilization of a single energy conversion and storage device.

中文翻译：

使用NiCo2S4作为正极上针对OER / ORR的高效双功能光催化剂的可充电光敏锌空气电池

在氧释放反应（OER）和氧还原反应（ORR）电催化剂中使用自由太阳能来提高锌-空气电池（ZABs）的效率尚未得到广泛研究。本文中，我们报道了具有尖晶石型NiCo ₂ S ₄（NCS）urchin样结构的光敏双功能催化剂，该结构具有丰富的中孔和大约ca的直接带隙能。1.4和2.4 eV。两个OER（NCS的催化剂表现出高的催化活性ɳ = 338毫伏在10mA厘米^-2）和ORR（ɳ = 475毫伏在ë _1/2），比得上国家的最先进的同行（例如，对于ORR，RuO ₂为Pt / C对于OER）。在光照射下，p型光敏NCS催化剂可以吸收可见光，通过光电效应产生光生空穴和光电子，从而随着动力学电荷转移过程的增加将光能直接转化为电能，并提供与黑暗条件相比，OER和ORR超电势分别降低了10％和18.5％。此外，以光敏NCS为阴极的成品锌-空气电池在暴露于可见光后，电压间隙从0.82降低至0.60 V，往返效率从59.2％提高至68.8％。

更新日期：2020-02-03

点击分享查看原文

点击收藏

阅读更多本刊最新论文