Article
Multidisciplinary Sciences
Rui-Ting Gao, Nhat Truong Nguyen, Tomohiko Nakajima, Jinlu He, Xianhu Liu, Xueyuan Zhang, Lei Wang, Limin Wu
Summary: Here we demonstrate a strategy to enhance the photoelectrochemical performance of the BiVO4 photoanode in neutral electrolyte by in situ forming a NiB layer through the addition of nickel and borate species. The NiB/BiVO4 photoanode shows a high photocurrent density of 6.0 mA cm-2 at 1.23 VRHE and a photostability over 600 hours. The addition of Ni2+ inhibits the dissolution of NiB and improves the charge transfer, while borate species act as a promoter for catalyst activity. The synergy effect of both species suppresses charge recombination and photocorrosion of BiVO4.
Article
Chemistry, Physical
Tae Sik Koh, Periyasamy Anushkkaran, Jun Beom Hwang, Sun Hee Choi, Weon-Sik Chae, Hyun Hwi Lee, Jum Suk Jang
Summary: In this study, an Al-Zr/HT photoanode was fabricated by magnetron sputtering deposition of an Al-layer on Zr-doped FeOOH samples. The correlations between the thicknesses of the sputtered Al-layer and the photoelectrochemical characteristics were investigated. The optimized Al-Zr/HT photoanode exhibited higher photocurrent and lower onset potential compared to the bare Zr/HT photoanode.
Article
Chemistry, Physical
Kailong Liu, Long Zhang, Qi Jiang, Mengyan Huang, Peng Liu, Shiyu Zuo, Peiyan Ma, Zhengyi Fu
Summary: Transition metal-based cocatalysts are crucial for boosting the surface kinetics of hematite photoanode. However, their effectiveness is limited by the shallow reconstruction process that generates highly efficient metal oxyhydroxides during the oxygen evolution reaction. To overcome this limitation, a Brnsted base-regulated strategy is developed to promote in situ surface reconstruction of cocatalysts on Ti-doped hematite under photoelectrochemical conditions. The resulting CoWO4 cocatalyst-decorated Ti-doped hematite photoanode exhibits significantly enhanced photocurrent density compared to activated Ti-doped hematite and CoOx/Ti-doped hematite. Tungstate promotes the surface reconstruction of cobalt-based cocatalyst, resulting in improved charge separation and transfer efficiency and enhanced performance of the Ti-doped hematite photoanode.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Huan Chai, Peng Wang, Tong Wang, Lili Gao, Feng Li, Jun Jin
Summary: The performance of a hematite photoanode in PEC water oxidation can be significantly improved by fluorine doping and an ultrathin amorphous cobalt silicate cocatalyst, which reduce interfacial transfer resistance and accelerate oxygen evolution reaction kinetics. This comprehensive method demonstrates a feasible strategy for enhancing the charge separation and overall efficiency of the photoelectrochemical system.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Joan Talibawo, Pannan Kyesmen, Marie C. Cyulinyana, Mmantsae Diale
Summary: In this study, zinc and nickel co-doping of hydrothermally synthesized hematite nanorods was used to enhance the photoelectrochemical water splitting process. The doped samples showed high photon absorption and narrow bandgaps within the visible spectrum. The optimal doping condition resulted in significantly increased photocurrent density compared to undoped samples, as well as increased dopant concentration.
Article
Chemistry, Physical
Jiale Xie, Pingping Yang, Liuliu Wang, Jie Ren, Xingyu Lu, Canyu Zhong
Summary: The study demonstrates the passivating effect of transparently hydrated manganese phosphate (Mn-Pi) catalyst on hematite surface states, enhancing surface band bending and improving photovoltage and charge separation. Additionally, the valence change of Mn element in Mn-Pi allows favorable charge transfer and low resistance for photogenerated holes, making it a suitable transparent passivating catalyst for photoelectrochemical water splitting.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Xiaokang Wan, Yunbo Xu, Xianyun Wang, Xiangjiu Guan, Yanming Fu, Chao Hu, Haowei Hu, Nai Rong
Summary: Plasma enhanced atomic layer deposition and subsequent removal of Al2O3 ultrathin overlayers on bismuth vanadate were utilized to passivate surface states and enhance PEC performance significantly. The modified BiVO4 showed a 73% increase in photocurrent density compared to unmodified BiVO4, demonstrating a novel strategy for surface modification of semiconductors in photoelectrochemical energy conversion.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Kun Zhang, Yang Wang, Mingquan Tao, Lutong Guo, Yongrui Yang, Jiangyang Shao, Yanyan Zhang, Fuyi Wang, Yanlin Song
Summary: In this study, a CS2 vapor-assisted passivation strategy is proposed to address the surface trap issue in perovskite photovoltaics. The method successfully enhances device efficiency and stability, with an average lifetime of 1040 hours and over 90% initial efficiency retention after 2000 hours at high humidity and temperature.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Ji Hyun Kim, Jung Min Kim, Zhenhua Pan, Woon Yong Sohn
Summary: In this study, different types of Hematite (& alpha;-Fe2O3)-based photoanodes treated with CeOx, FeOOH, and NiFeOx were fabricated to investigate their effects on the onset potential shift. The Hematite films treated with CeOx or FeOOH did not show cathodic shifts in the onset potentials, although significant improvements in charge transfer efficiencies were achieved. However, Hematite treated with NiFeOx exhibited significant improvement in photoelectrochemical performance, including a cathodic shift in the onset potential, which could be attributed to enhanced charge separation efficiency.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Chemistry, Physical
M. S. Vasilyeva, I. Lukiyanchuk, A. A. Sergeev, A. Yu Ustinov, K. A. Sergeeva, V. G. Kuryavyi
Summary: Oxide heterostructures containing Co, W, and P were successfully obtained on titanium substrates, exhibiting photocatalytic activity under solar light illumination. The proposed mechanism involves the formation of p-n heterojunction and hole capture to facilitate oxidation reactions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Shilpa Santhosh, Hanan Teller, Alex Schechter, Nandakumar Kalarikkal
Summary: Urea, as an energy generation and storage fuel, has attracted attention for its stability, non-toxicity, and availability. A study found that a Mn-doped NiCo2O4 catalyst showed the highest activity in urea oxidation in an alkaline medium, with a mass activity 15 times higher than other catalysts.
Article
Energy & Fuels
Satirtha K. Sarma, Ratan Mohan, Anupam Shukla
Summary: The study demonstrates that Sn-doped hematite coated with low precursor concentration of NiFe-LDH can achieve higher photocurrent density and lower onset potential. However, for the high precursor concentration case, the formation of a thick film of NiFe-LDH results in a lower current density.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Engineering, Environmental
Guangyao Li, Muhua Chen, Xuelin Huang, Ping Wang
Summary: This study investigates the catalytic activity of carbon-supported Co(3_x)Mn(x)O4 catalyst for formaldehyde oxidation. The incorporation of Mn ions into Co3O4 lattice significantly enhances the catalytic activity and stability of the catalyst, resulting in a ten-fold higher mass-specific activity compared to Co3O4/C. The proposed mechanism for formaldehyde oxidation over Co3_xMnxO4/C catalyst is based on in situ diffused reflectance infrared spectroscopy results.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Jing Li, Feng Li, Jun Jin
Summary: In this study, an efficient hole transport photoanode was developed by in situ growth of ultrathin Fe-doped NiOOH on fluorine-doped hematite arrays. The resulting photoanode showed significantly improved charge separation and injection efficiency compared to traditional hematite. The synergistic effect of Fe and F co-doping enhanced the extraction rate of photogenerated charges.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Maheswari Arunachalam, Kanase Rohini Subhash, Kwang-Soon Ahn, Chung Soo Kim, Jun-Seok Ha, Sang-Wan Ryu, Soon Hyung Kang
Summary: This paper investigates chemically surface-modified gallium nitride (GaN) films used as photoanodes for photoelectrochemical (PEC) water splitting. The engineered beta-Ga2O3/GaN-30 s photoanode showed excellent photocurrent density compared to other samples, indicating the potential for highly stable water splitting through modulation of reaction kinetic parameters.
ACS APPLIED ENERGY MATERIALS
(2022)