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Reduced Graphene Oxide as a Catalyst Binder: Greatly Enhanced Photoelectrochemical Stability of Cu(In,Ga)Se2 Photocathode for Solar Water Splitting
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-02-15 , DOI: 10.1002/adfm.201705136 Bonhyeong Koo 1 , Segi Byun 1 , Sung-Wook Nam 2 , Song-Yi Moon 3, 4 , Suncheul Kim 5 , Jeong Young Park 3, 4 , Byung Tae Ahn 1 , Byungha Shin 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-02-15 , DOI: 10.1002/adfm.201705136 Bonhyeong Koo 1 , Segi Byun 1 , Sung-Wook Nam 2 , Song-Yi Moon 3, 4 , Suncheul Kim 5 , Jeong Young Park 3, 4 , Byung Tae Ahn 1 , Byungha Shin 1
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The photoelectrochemical (PEC) properties of a Cu(In,Ga)Se2 (CIGS) photocathode covered with reduced graphene oxide (rGO) as a catalyst binder for solar‐driven hydrogen evolution are reported. Chemically reduced rGO with various concentrations is deposited as an adhesive interlayer between CIGS/CdS and Pt. PEC characteristics of the CIGS/CdS/rGO/Pt are improved compared to the photocathode without rGO due to enhancement of charge transfer via efficient lateral distribution of photogenerated electrons by conductive rGO to the Pt. More importantly, the introduction of rGO to the CIGS photocathode significantly enhances the PEC stability; in the absence of rGO, a rapid loss of PEC stability is observed in 2.5 h, while the optimal rGO increases the PEC stability of the CIGS photocathode for more than 7 h. Chemical and structural characterizations show that the loss of the Pt catalyst is one of the main reasons for the lack of long‐term PEC stability; the introduction of rGO, which acts as a binder to the Pt catalysts by providing anchoring sites in the rGO, results in complete conservation of the Pt and hence much enhanced stability. Multiple functionality of rGO as an adhesive interlayer, an efficient charge transport layer, a diffusion barrier, and protection layer is demonstrated.
中文翻译：
还原的氧化石墨烯作为催化剂的粘合剂：大大提高了用于太阳能水分解的Cu（In，Ga）Se2光电阴极的光电化学稳定性
Cu（In，Ga）Se 2的光电化学（PEC）特性（CIGS）光电阴极覆盖有还原的氧化石墨烯（rGO）作为太阳能驱动的氢气释放的催化剂粘合剂。化学还原的各种浓度的rGO作为CIGS / CdS和Pt之间的粘合剂夹层沉积。与不带rGO的光电阴极相比，CIGS / CdS / rGO / Pt的PEC特性得到了改善，这是由于通过传导性rGO到Pt的光生电子的有效侧向分布提高了电荷转移，从而提高了电荷转移。更重要的是，在CIGS光电阴极中引入rGO可以显着增强PEC的稳定性。在没有rGO的情况下，可在2.5 h内观察到PEC稳定性的快速损失，而最佳rGO可将CIGS光电阴极的PEC稳定性提高超过7 h。化学和结构表征表明，Pt催化剂的损失是缺乏长期PEC稳定性的主要原因之一。rGO的引入通过在rGO中提供锚定位点而成为Pt催化剂的粘合剂，从而完全保留了Pt，从而大大提高了稳定性。展示了rGO作为粘合夹层，高效电荷传输层，扩散阻挡层和保护层的多种功能。
更新日期：2018-02-15
中文翻译：
还原的氧化石墨烯作为催化剂的粘合剂：大大提高了用于太阳能水分解的Cu（In，Ga）Se2光电阴极的光电化学稳定性
Cu（In，Ga）Se 2的光电化学（PEC）特性（CIGS）光电阴极覆盖有还原的氧化石墨烯（rGO）作为太阳能驱动的氢气释放的催化剂粘合剂。化学还原的各种浓度的rGO作为CIGS / CdS和Pt之间的粘合剂夹层沉积。与不带rGO的光电阴极相比，CIGS / CdS / rGO / Pt的PEC特性得到了改善，这是由于通过传导性rGO到Pt的光生电子的有效侧向分布提高了电荷转移，从而提高了电荷转移。更重要的是，在CIGS光电阴极中引入rGO可以显着增强PEC的稳定性。在没有rGO的情况下，可在2.5 h内观察到PEC稳定性的快速损失，而最佳rGO可将CIGS光电阴极的PEC稳定性提高超过7 h。化学和结构表征表明，Pt催化剂的损失是缺乏长期PEC稳定性的主要原因之一。rGO的引入通过在rGO中提供锚定位点而成为Pt催化剂的粘合剂，从而完全保留了Pt，从而大大提高了稳定性。展示了rGO作为粘合夹层，高效电荷传输层，扩散阻挡层和保护层的多种功能。
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