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Calculating pH Changes in a Buffer Solution

Calculating pH Changes in a Buffer Solution

A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...

Buffers

Buffers

A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...

Weak Base Solutions

Weak Base Solutions

Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...

Buffer Effectiveness

Buffer Effectiveness

Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...

Strong Acid and Base Solutions

Strong Acid and Base Solutions

A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.

Buffers: Buffer Capacity

Buffers: Buffer Capacity

Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...

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Related Experiment Video

Updated: Feb 11, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing

Flash Infrared Annealing for Perovskite Solar Cell Processing

Published on: February 3, 2021

A solution-processed pillar[5]arene-based small molecule cathode buffer layer for efficient planar perovskite solar

Hongwei Lei¹, Xiaofeng Chen, Lingwei Xue

¹College of Science, Huazhong Agricultural University, Wuhan 430070, China.

|April 20, 2018

Summary

This summary is machine-generated.

A new pillar[5]arene-based small molecule, C3, acts as an effective cathode buffer layer (CBL) in perovskite solar cells (PVSCs). This material enhances device performance and efficiency through improved interface contact and reduced barriers.

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Planar p-i-n perovskite solar cells (PVSCs) often face efficiency limitations due to interface barriers between electron transport layers (ETLs) and metal electrodes.
Conventional fullerene derivatives like PCBM can have suboptimal interface contact and surface morphology, hindering charge transport.

Purpose of the Study:

To design and synthesize a novel small molecule material, C3, for use as a cathode buffer layer (CBL) in PVSCs.
To investigate the effect of C3 on the interface properties and overall performance of PVSCs.
To evaluate C3 as a potential solution-processed material for efficient and stable PVSCs.

Main Methods:

A pillar[5]arene-based small molecule, C3, was synthesized and processed from solution at room temperature.
C3 was incorporated as a single-layer CBL between the PCBM ETL and the Ag electrode in planar p-i-n PVSCs.
Device performance metrics including power conversion efficiency (PCE) and hysteresis were measured and compared to control devices.

Main Results:

C3 demonstrated a work function tunneling effect, reducing the Ag electrode's work function and improving interface contact.
The C3 capping layer enhanced the surface quality of PCBM, creating a smooth, dense, and pinhole-free morphology.
PVSCs with a C3 CBL achieved a high PCE of 17.42% with negligible hysteresis, significantly outperforming devices with a pure PCBM ETL.
PVSCs on flexible substrates with C3 achieved PCEs exceeding 13%.

Conclusions:

Solution-processed C3 functions effectively as a single-layer CBL, significantly enhancing the performance of planar p-i-n PVSCs.
C3's ability to modify interfaces, improve morphology, and facilitate electron transport makes it a promising material for efficient solar cells.
Pillar[5]arene-based small molecules offer a viable pathway for developing high-performance, solution-processed cathode buffer layers for perovskite solar applications.