Effect of oxygen evolution catalysts on hematite nanorods for solar water oxidation

Abstract

Photochemical deposition of Co and Ni based oxygen evolution catalysts on hematite nanorods cathodically shifted the onset potential of photocurrent near to the flat band potential of hematite. A 9.5 fold enhancement in the photocurrent density at 0.86 V vs. RHE compared to the parent hematite photoanode was observed with the Ni-Bi/Fe(2)O(3) photoanode.

Key Strategies to Advance the Photoelectrochemical Water Splitting Performance of α‐Fe2O3 Photoanode

“…Since the successful electrodeposition of NiBi thin layer on ITO substrate, Ni‐based OECs have gained much interest. Hong and co‐workers reported the photochemical synthesis of NiBi/α‐Fe 2 O 3 photoanode which lowered V onset by nearly 200 mV for water oxidation and increased 9.5 times the photocurrent density at 0.86 V RHE . The reported V onset of NiBi/α‐Fe 2 O 3 photoanode (0.52 V RHE ) is quite low and near the flat band potential of α‐Fe 2 O 3 (0.4 V RHE ).…”

A light-assisted, polymeric water oxidation catalyst that selectively oxidizes seawater with a low onset potential

“…solid-state Co, Ir or other oxides). [1][2][3][4][5][6][7][8][9][10][11][12][13] Under illumination with sunlight, such electrodes oen commence oxygen evolution at onset potentials well below the thermodynamic minimum for the reaction in the dark. Energy from the incident light then drives the catalysis.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] The aim is to develop anodes that, when coupled to hydrogen-generating cathodes, can split water at zero bias using light illumination only. Devices of this type have been reported, 1,2 but are currently commercially unviable because of processing and other features related to the semiconductor substrates.…”

Efficient water oxidation using α-Fe2O3 thin films conformally coated on vertically aligned titania nanotube arrays by atomic layer deposition

“…We speculate that it may result from the sluggish oxygen evolution kinetics of α-Fe 2 O 3 , which imposes an energy barrier hindering oxygen from evolving in an appreciable manner. A photocurrent plateau in a similar potential range was also observed in other hematite photoanodes previously [20][21][22], and was attributed to the kinetic limitation [21]. The Mott-Schottky plots of the electrode measured in the dark and under illumination were shown in Fig.…”