A Capacitor‐type Faradaic Junction for Direct Solar Energy Conversion and Storage

Abstract

Two-electrode solar rechargeable devices trigger intense attention due to their potential applications in solar energy conversion and storage.H owever,i nterface energy barriers lead to severe loss of output voltage and negligible dark discharge current. Therefore,external biases are required for dark discharge in these devices,l imiting their practical applications.H erein, we report an ew two-electrode device of Si/WO 3 /H 2 SO 4(aq) /C that can work without bias.The device has the highest dark output power among all of the two-electrode solar rechargeable devices.T he device based on aS i/WO 3 junction indicates photoinduced adjustable interface barrier height during charge transfer,w hich can overcome the energy barrier and realized ark dischargew ithout bias.O wing to the interface characteristics,t he Si/WO 3 is designated as ac apacitor-type Faradaic junction.

An Extrinsic Faradaic Layer on CuSn for High-Performance Electrocatalytic CO 2 Reduction

“…During the stability measurement, the total current density of CuSn/Zn(OH)x increases from 9 mA/cm 2 to 15 mA/cm 2 , while the Faradaic efficiency for HCOOH keeps about 80% for 40h. On the CuSn sample, though the total current density also increases from 5 mA/cm 2 to 9 mA/cm 2 , the Faradaic efficiency for HCOOH interface is considered as a Faradaic junction 14,16 . Since an intrinsic Faradaic layer can be observed on not only a semiconductor 15 but also a metal.…”

“…In previous studies, different metals have been used as electrocatalysts for CO2 reduction [4][5][6] . Generally, there are intrinsic hydroxyls layers on the surfaces of metal electrocatalysts [7][8][9][10] , on which Faradaic reaction (coupled electrons and ions reactions) occurs and are active sites for CO2 reduction during electrocatalysis [11][12][13][14][15][16] . Therefore, the surface hydroxyls layers can be considered as intrinsic Faradaic layers.…”

Recent advances in highly integrated energy conversion and storage system

“…92 In addition, metal oxides with pseudocapacitance properties can produce higher capacitance through reversible redox reactions. [93][94][95] For instance, the TiO 2 nanowire/NiO nanoflakes and the Si nanowire/Pt nanoparticle composites are served as photoanode and photocathode to prepare a solar-powered device in Figure 6B. It can be charged to ∼0.45 V and yield a capacitance of ∼455 F/g by pseudocapacitance of NiO without any external power supply.…”

Photoelectron Storages in Functionalized Carbon Nitrides for Colorimetric Sensing of Oxygen

“…[10][11] One can imagine that developing new mechanism-based chromogenic system with multiformity and high reversibility is of great interest for more demanding future applications. 12 Photoelectron storing materials, including conventional metal oxides (e.g., WO3 [13][14] , TiO2 [15][16][17] , and ZnO 18 ) and recent polymeric carbon nitrides (CN), [19][20] can accumulate electrons upon light excitation. Interestingly, all their long-lived excited states generally demonstrated a unique blue color, [21][22][23] indicative of a new type of chromogenic mechanism.…”